Note: Descriptions are shown in the official language in which they were submitted.
;~0 ~9~;
WATER-DISINTEGRABLE CL~ANING S~EET
FIELD OF THE ~i2NTION
Th s inven_ion relates to a water-disintegrable
_leaning sheet, and more particularly to a water-dislntegrable
cleaning sheet comprising a specific water disintes-able paDer
having incorporated or impregnated thereinto an a~ueous
cleaning agent containing an organic solvent, which is suitable
for cleaning or sterilization o. floors or walls Oî rooms or
toilet rooms, furniture, toilet seats, toilQt basins, etc. or
useful as toilet paper, and can be thrown into flushing water.
B~CXGROUND OE THE_INVENTION
Water-disintegrable papers or cleaning goods made of
a chemicai-&or.taining wa.er-disintegrable paper which can be
~hrown into water have been used as toilet paper or for
cleaning a toilet room or toilet equipment. Conventio~a
water-disintegrable paper usually contains a dry s~rength agent
such as polyvinyl alcohol, carboxymethyl cellulose, and
cationic starch, for enhancing dry paper strength without
impairing water d:isintegrability.
However, a paper sheet containing a dry strength
agent undergoes serious reduction of strength when impregnated
with water. Therefore, where a water-disintegrable paper is
combined w th a cleaning asent for cleaning or sterilization of
floors, walls, furniture, and toilet equipment or for use as
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toilet paper, the cleaning agent to be combined with has been
limiteà to liquid substances or chemicals having no or very low
wa~er content.
In using z cleaning agenL cS high water content, it
has beer necessary that the cleaning agent should be foamed and
sp~ayQd on a water-disintegrable pa?er i.~ediately befo-e use
and be used without delay in order to suppress water absorption
iII ~0 paper and to pr2vent strength reduction.
Polyacrylamiàe or the like dry strength agent endows
paper with strength enough lo withstand use even with a small
amount of water being impregnated in the paper sheet, but tends
to impair water di~inteyrability of the sheet.
Hence, the conventional dry strength agents could not
provide a strength enough to withstand cleaning use even when
combined with a cleaning agent of high water content in good
balance with water disintegrability.
It has been proposed to spray a binder solution
containing polyvinyl alcohol and borax on a paper sheet
followed by drying by heat whereby polyvinyl alcohol and borax
are reacted to provide water-disintegrable paper having
temporary water resistance, which is useful as absorbent
materials such as napkin or diaper, as disclosed in JP-A-47
9486 (the term "JP-A" as used herein means an "unexamined
published Japanese patent application"3. Further, JP-A-61-
296159 discloses a water-disintegrable paper in which an
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200 ~296
aqueous solution containing salts such as potassium salt,
calciu~ salt nd barium sa't, is impregnated into a fiorous
sheet contain ng carrageenan as a bin~er, which is used for a
wetting tissue p~per. F~rthermore, JP-A-55-lQ3393 ~isclGses a
method for preparing a paper having high strength in a dry
state while lcw in we~ ctate~ wh ch comp~lsec tre~ting paper
surface with alkali metal and/or alkali earth metal salt of
polyacrylic acid polymers, and that the paper can be used for
writing paper, printing paper, wrapping paper, etc. These
water-disintegrabl~ papers, however, does not withstand the
mechanical force in cleaning work when impregnated with water.
S~Y OF THE INVENTION
An object of the present invention is to provide a
wate--disinteg able cleaning sheet containing a claaning agent,
which has strength enough for cleaning use under a mechanical
forca while retaining satisfactory water disintegrability.
As a _esult of extensive invastigations, the
inventors have found that the above object of the present
invention is accomplished by incorporating a water-soluble
binder having a carboxyl group and at least one metallic ion
selected from the group consisting of ions of an alkaline earth
metal, manganese, zinc, cobalt and nickel, and an aqueous
cleaning agent containg an organic solvent into a web composed
of water-dispersible fibers.
ZOO~X96
The present invention provides a water-disintegrable
cleaning sheet comprising a web of water-dispersible fibers
having incorporated thereinto a water-soluble binder having a
carboxyi group; at least one polyvalent metallic ion selected
from the group consisting of io~s of al~zlina eart~ me'als,
manganese, zirc, cobalt and nickel; and an a~ueous cleaning
agent containing an organic solvent.
DETAILED DESC~IPTION OF THE INVENTION
Water-dispercible fibers which constitute a water-
disintegrable cleaning sheet of the present invention are not
particularly restricted as long as they ars fibrous materials
substantially dispersible in water. Examples of suit~ble
~ater-dispersible fibers are wood pulp fibe,s, non-wood
vegetable fibers, and synthecic fibers such as rayon fibers and
polyester fibers.
Water-soluble binders having a carbo~yl group which
can be used in the present invention include polysaccharide
derivatives, synthetic high polymers, and naturally-occurring
substances.
Examples of suitable polysaccharide derivatives
include carboxymethyl cellulose, carboxyethyl cellulose, and
carboxymethylated starch, with carboxymethyl cellulose being
preferred.
Examples of suitable synthetic high polymers include
homopolymers of an unsaturated carboxylic acid, copolymers of
Z1)0~96
two or more unsatura,ed carboxylic acids, and copolymers of an
unsaturated carboxylic acid and other copolymeriæable monomer.
Specific examples of suitable Insaturated carboxylis acids are
acrylic acid, methacrylic ac~d, itaconic acid, crotonic acid,
maleic anhydride, maleic acid, ~nd fumaric acid. Monomers
copolymerizable with the unsa~urated carboxylic acid include
esters of these ur.saturated carbox-fllc acids, vinyl aceta~e,
olefins (e.g., etilylene~, acrylamide, and vinyl ether.
Preferred of these high polymers are those contain~ng an
acryl c acid and/or methacrylic acid unit, e.g., polyacrylic
acid, polymethacrylic acid, an acrylic acid-methacrylic acid
copolymer, and an acrylic acid (or methacrylic acid)-alkyl
acrylate (or alkyl methacrylate) copolymer.
Examples of suitable naturally-occurring water
solub'e binders are alginic acid, xan~han g-~., arabic gum,
tragacanth aum, and pectin.
Among these water-soluble binders, carboxy~ethyl
cellulose is particl1larly preferred.
The water-soluble binder is usually used in an amount
of from 0.1 to 30% by weight, preferably from 1 to 15% by
weight, and more preferably form 1 to 10% by weight, based on
an amount of a dry web.
A metallic ion which is incorporated into the water-
disintegrable cleanin~ sheet of the present in-~ention
(hereinafter refexred to as an 'essential metallic ion-) is at
29~
least one selected from the group consisting of ions of
alkaline earth metals such as magnesium, calcium, strontium and
barium; manganese; zinc; cobalt; and nickel.
Of ~he metal'ic ions as desc_ibed abo-ve, calcium,
strontium, barium, zinc, cobalt, and nickei ions are preferred
-rom the standpoi~t of ,ufficient st ength fcr clearing ~-ork of
the cleaning sheet of the present invention.
Monovalent metallic ions other than Ihose described
above satisfy water disintegrability but cannot arford strength
withstanding cleaning work. Divalent metallic ions other than
those described above, e.g., Cu2', Fe2+ or Sn2+, and trivalent
metailic ions other than those described above, e.g., Fe~ or
A~3+, afford strength enough for cleaning work but do not
sa~isfy water disintegrability.
The essential metallic ion is preferably used in an
amount of al least 1/4 mol, more preferably at least 1/2 mol,
per mol of carboxyl group of the water-soluble binder.
The essential metallic i~n is incorporate~ into the
water-disintegrable cleaning sheet of the present invention in
the forms:
(A) an intermolecular mixed salt of the water-
soluble binder formed between the carboxyl group thereof and
(a) an alkali metal and (b) at least one selected from the
group consisting of alkaline earth metals, manganese, zinc,
cobalt and nickel; and/or
;~0~296
(B) at least one of water-soluble salts such as
hydroxides, chlorides, sulfates, nitrates, carbonates, formates
and acetales, of at least one selected from the group
consist~ng of an alkaline earth metal, mangznes~, zinc, cobal
and nickel.
In the inter~olecu7~r rrlixe-~ sal~ zs ment-oned abov2
as form (A), a molar ratio of (a)~(b) is in the range of from
l/0.01 to 1/10, preferably from l/0.05 to 1~3.
When the metal ion is incorporated into the cleaning
sheet of the present invention in the form (B) above, an alkali
metal salt of the binder which formed a salt between the
carboxyl group and an alkali metal such as sodium and
po~assium, is preferably used as a water-soluble binder.
The above forms (A) and (B) of th~ essential metallic
ion are used each aione, or combination thereof to incorporate
the essential metallic ion into the cieaning sheet of the
present inv2ntion.
The wzter-disintegrable cleaning sheet of the present
invention can be produced by incorporating water-disintegrable
paper composed of the above-mentioned components with an
aqueous cleaning agent containing an organic solvent.
Processes for producing the water-disintegrable paper
which constitute the water-disintegrable cleaning sheet of the
present invention are not particularly restricted and include
conventionally known wet process and dry process. For example,
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2C0~29~
when the essential metallic ion is incorporated in the water-
disintegrable paper in the form (B) above, the water-
disintegrable pape- can be obtained by spraying or coating an
aqueou~ solution of the waEer-soluble salt of at least one
selected from the group consistins of alkaline earth metals,
man~anese, zinc, ccbal~ and nickei, to a dry web conlzini..g
carboxyl-containing water-soluble binder, and then drying. The
paper containing carboxyl-cont2ining water-~oluble binder is
obtained by adding a carboxyl-con~aining water-soluble binder
into an aqueous dispersion of water-dispersible fibers and then
sub~ecting paper making, or by spraying or coating a carboxyl-
containing water-soluble binder to a web composed of water-
dispersible fibers, and then drying. Further, it can be
ODtaine~ by spraying or coating a carboxyl-cont2ining water-
soluble b nder and an aqueous solution containing water-soluble
salt of at least one selected from the g-oup consisting of an
alkaline earth metal, manganes , zinc, cobalt and nickel, and
then drying.
When the essential metallic ion is incorporated in
the water-disintegrable paper iIl the form (A) above, namely a
form of an intermolecular mixed salt of the water-soluble
binder, the water-disintegrable paper is obtained by adding the
intermolecular mixed salt binder into an aqueous dispersion of
water-dispersible fibers and then subjecting paper making, or
by spraying or coating a solution of the intermolecular mixed
-- 8 --
2(~0 ~296
salt binder to a web composed of water-dispersible fibers and
then drying.
Further, when the essential metallic ion is
incorporated in the water-disintegrable paper in combination of
forms (~ and (~) above, the above-ment-oned incorporating
prGcesscs are optionally comb1ned to obtain _he paper.
Processes for producir.g the water-disintegrable
cleaning sheet of the present invention aIe not particularly
restric'ed, and it can be produced, for ex2mple, by
incorporating or impregrating an aqueous cleaning agent into
the water-disintegrab~e paper as described above, or adding an
aqueous cleaning agent into the water-disintegrable pzper at
any step of the above~mentioned production procedure of the
water-disintegrable paper. Further, the water-disintegrable
cleaning sheet can be produced by incorporating an aqueous
cleanig agent together with the essential metallic ion of the
present invention. In such production, 1he essential metallic
ion is, for example, incorporated into the water-disintegrable
cleaning sheet by dissolving at least one of water-soluble salt
of the essential metallic ion, namely the form (B) as mentioned
above, into an aqueous cleaning agent containing an organic
solvent, and impregnating or spraying the resulting aqueous
cleaning agent into the web containing calboxyl-containing
water-soluble binder, and then drying.
_ 9 _
Z(~O~Z96
The aqueous cleaning agent which is incorporated in
the cleanir.g sheet essentially contains an organic solvent fo-
obtainlng nigh strength withstanding cleaning ~-ork. Suitable
organ-c solvents are watel-compatible (cr water-soluble)
solvents typically including mor.ohydric lower alcohols such as
e'hanol, meth_nol, and propar.ol; g]ycols such 2S 2thylene
glycol, diethylene glycol, polyethylene glycol, propylene
glycol, dipropylene glycol, buthylene glycol and hexylene
glycol; mono- or dlethers of the aforementioned glycols and
lower alcohols such as methanol, ethanol and butanol; esters of
the aforementioned glycols and lower fatty acids; and
poiyhydric alcohols such as glycerine and sorbitol. In using
water-insoluble solvents, they are added in the form of an
emulsion.
The aqueous cleaning agent is usually used in an
amount about 0.5 to 5 times, prererably 1 to 2.5 times the
weight of water-disintegrable paper.
The content of the organic solvent in th~ aqu20us
cleaning agent ranges from 95 to 5~ by weight, preferably from
8 to 92% by weight, and that of water ranges from 5 to 95~ by
weight, preferably from 92 to 8% by weight. For sterilization
of toilet equipment, etc., cleaning agents rich in organic
solvent, e.g., ethanol and isopropyl alcohol, are employed.
For removal of hydrophilic dirt from living rooms, kitchens or
toilet rooms, aqueous cleaning agents rich in water are
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2(~ 29~
employed. In this case, the water content ranges from 30 to
9S~ by weight, preferably from 40 to 92% by weigh~, more
preferably from O0 to 90~ by wei~ht, ard the organic solv~nt
conter.t ransQs from 5 to 70% ~y ~eight, preferably fro~ 8 to
60% by weight, more preferably from 1~ to 40~ by weight.
Ir desired, the aqueous cle3r.ing ~gents may furtner
contain surfactants, sterilizers, deodorizers, perf~es, and
t he like
~ s the s-~rfactants which may be contained in the
cleaning agent of the present invention, anionic surfactants,
nonionic surfactants, cationic surfactants and amphoteric
surfactants are include. Preferred examples thereof include
amine oxides having one or two of alkyl group containing 8 to
22 carbon ato~s or lower alkyl gr.up, sulfcbetaines or
hydroxysulfobetaines having alkyl group containing 8 to 22
carbon aioms, and carbobetaines having alkyl group cont~ir.ing
8 to 22 carbon atoms, as amphoteric surfactants; alkylsulfates
containing 8 to 22 carbon atoms, alkyl ether sulfates adding 1
to 30 mol of ethylene oxide and having alkyl group containing
8 to 22 carbon atoms, alkylbenzene sulfonic acid salts having
alkyl group containing 8 to 22 carbon atoms, ~-sulfofatty acid
ester salts containing 8 to 22 carbon atoms, alkyl (or alkenyl)
succinates containing 6 to 22 carbon atoms, and
paraffinsulfonates containing 8 to 22 carbon atoms, as anionic
surfactants; polyoxyalkylenes (mainly, polyoxyethylene,
2~0~'36
polyoxypropylene, or a mixture of these), glycol ethers,
polyoxyalkylene alkyl phenyl ethers, alkyl glycosides, and
sucrose fa~ty acid esters, as nonionic sur actants; quatQrnary
a.~monium salts having an aiky-l srcup con.air.ing ~ to 11 carbon
atoms, 2S cationic surfactants. These surfactants a--e added
into the cleanirg zgents to 're ircGr~C~atQ ir. o wa~er-
disintegrable cleaning sheet in an amount of generally from C.i
to 5~ by weight.
A cleaning sheet prepared by simply impregnatina
water-disintegrable paper containing a carboxyl~containing
water-soluble binder with an aqueous solution having dissolved
therein the above-dsscribed metallic ion, or by simply
incorporating the web composed of water-dispersible fibers with
an intermolecular mi~ed salt of the water-soluble binder fails
to exhibit sufficient strength enough to carry out cleaning.
It is considered that a combined use of an organic solvent
markedly accelerates forma~ion of an insolubilized crosslinked
complex of the water-soluble binder and the metallic ion to
thereby afford sufficient strength for cleaning work even in
using an aqueous cleaning agent having a very high water
content. Further, when spent water-disintegrable paper is
discarded into toilet flushing wa~er, etc., the metallic ion
and organic solvent in the sheet are diluted with a large
quantity of water to make the insolubilized binder water-
soluble, thereby maintaining water disintegrability.
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~ 3~j
As described above, the water-disintegrable cleaning
sheet of the present invention, e-~en when using a cleaning
agent of high water content, exhibits strength withstanding
cleaning work and satisfactory watcr disintegrability in good
balance and proàuces great effects as cle~nin~ sheet.
The p~esent invention is now illustrated in greater
detail by way of the following Examples, but it should be
understood th~t the present invention is not construed as being
limited thereto. All the percents, parts, and ratios are given
on a wei~ht basLs unless otherwise indicated.
EXAMPLE 1
A toilet paper-like water-disint~grable paper sheet
having a basis weight of 25 g/m2 was produced from a bleached
~raft pulp of coni,er beaten to a CS~ (Canadian Stand~rd
Freeness) of fi80 cc using an ordinary paper machine.
The water-disintegrable paper sheet was sprayed with
3% (corresponding to 0.75 g/m2) of a sodium car~oxymethyl
cellulose CMC 2200" (produced by Daisel ~agaku R.R.) in the
form of a 1% aqueous solution and dried to obtain a CMC-
containing sheet.
The CMC-containing sheet was impregnated with 1.7
times the sheet weight of a 1% solution of calcium chloride in
an ethanol/water mixed solvent having a ratio of 50/50, 20~80,
10/90 or 0/100 to obtain a water-disinte~rable cleaning sheet.
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Z~ Z96
Wet tensile strength, dusting and fuzzing on use, and
water disintegrability of the resulting cleaning sheet were
evaluated in a~cordance with the following test methods. The
results ~btained are shown in Table 1 below.
l. We~ Ter.sile ~trenqth:
A s~rip 25 mm w~de and 100 mm long was cut 01t of the
cleaning sheet, and breaXing strength of the strip in the
machine direction (~D) and cross direction (CD) was measured
using a universal testing machine ~RTM-25" (manufactured by
Orientic K.K.) under conditions of 300 mm/min in rate of
pulling and 50 mm in grip distance.
2. Dustinq and Fuzzinq:
The cleaning sheet W2S used for wiping black tiles
inclusive of the joints for 5 minutas. Dusti~g on the tiles
and fuzzing of the sheet were observed and evaluated according
to the following rating system.
o: ~either substantial dusting nor fuzzing was observed.
~: Sligh.t dusting was observed, but fuzzing was not
observed.
x: Dusting and fuzzing were observed.
3. Water Disinteqrabilitv:
In l ~-volume beaker was put 500 m~ of water and
agitated with a stirrer at 300 rpm.
The cleaning sheet was cut to pieces of 50 mm x 50 mm
and put into the water under stirring. After 90 seconds, the
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disintegrated and dispersed state of the sheet was observed and
evaluated according to the following rating system, taking
co~ercially available toilet paper as a standard having
satisf2ctory dispersioility.
o: Satisfacto-y dispersion
~: Sligntly poor disrersion
x: Door dispersion
COMPARATI~/E ~:XAMPLE 1
A cleaning sheet was produced in the same manner as
in Example l, except for using an impregnating solution
containing no calcium chloride. The resulting cleaning sheet
was ~valuated in the same manner as in Example 1, and -ths
results obtained ar~ sho~n in Table l below.
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XOO~X9~
TABLE 1
Ethanol/hacer (w/w)
Example 1 50/50 20/80 10/90 0/100
-
Wet Tersile MD CDMD CD MD CD MD CD
StrengthlQ20 620 ~80 '10 370 22~ ~0 28
(g/25mm)`
Dusting and o c o x
Fuz7ing
Water- o o o o
Disintegrability
Comparative
Example l
Wet lensile MD CD MD CD MD CD MD CD
Strength 350 200 90 50 35 20 30 17
(gt25mm)
Dusting and Q x x x
Fuzzing
Watsr- o o o o
Disintegrability
EXAMPLE 2
Each of calcium chloride, bari~m chloride, strontium
nitrate, chromium chloride, manganese sulfate, zinc chloride,
cobalt chloride, nickel nitrate, and lead sulfate was dissolved
in a 2/8 mixed solvent of ethanol and water to prepare a 1%
impregnating solution. The CMC-containing sheet as prepared in
Example 1 was impregnated with a 1.7 times the sheet weight of
the impregnating solution.
Each of the resulting water-disintegrable cleaning sheets
was evaluat0d in the same manner as in Example 1, and the
results obtained are shown in Table 2 below.
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ZCi~ 36
COMPA~ATIVE EXAMPLE 2
A cleaning sheet was produced in the same manner as in
Example 2, except for replacing the metallic salt as used in
Example 2 with potâssium cnloride, copper sulfGte, ferrous
chloride, ferric chloride, stannouC chloride, or aluminum
sulf2te.
Each of the resulting sheets was evaluated in the same
manner as in Example 1, and the results obtained are shown in
Table 2 below.
Z0~ .Z9~,
TABLE 2
MetallicWet Tensile Dusting Water
Ion inStrenqth (g/25mm! and Disinte-
SolutionMD CD Fuzzinq Grabili~y
Example 2_
Ca2+ 480 310 o o
Sr7+ 492 322 o o
Ba2 524 340 o o
~n2+ 273 163 o o
Zn~+ 472 302 o o
Co2+ 396 194 o o
Ni2+ 440 276 o o
Comparative
Example 2
K 42 19 x o
Cu2+ 540 348 o x
Fe2+ 442 283 o x
Sn2+ 480 320 o x
Fe3+ 686 390 o x
A~3 760 41i o x
EXAMPLE_3
Calcium chloride was dissolved in a 2/8 mixed
solvent of ethanol and water in a prescribed concentration, and
the resulting impregnating solution was impregnated into the
CMC-containing sheet as prepared in Example 1 i.n an amount of
1.7 times the weight of the sheet to obtain a water-
disintegrable cleaning sheet containing a Ca2+ ion at a molar
200~ZI'3~i
ratio of 1/4, 1/2, or 1/1 to the carboxylate lon of CMC.
Each of the resulting cleaning sheets was evaluated
in the same manner as ir. Example 1, and the rssults obtained
are shown in Table 3 below.
TA3LE 3
~ Tensile Dustlng
Ca2+/COO~ strength ~q/~5mm! ar.d Water
Molar RatioMD CD Euzzinq Disintearability
1/1 560310 o o
1/2 490290 o o
1/4 345190 o o
EXAMPLE 4
A web of split and deposited fibers of a conifer fluff
pu]p (basis weight: 30 g/m2) was sprayed with ]5% of a sodium
salt of an acrylic acid-2-etnylhexyl acrylate copolymer (~3 by
mol~, followed by d-ying to obtain a water-soluble bir.der-
containing water-disintegrable sheet.
The resl~lting sheet was impregnated with 1.5 t mes the
sheet weight of an aqueous clear.ing agent comprising zinc
sulfate, polyoxyethylene dodecyl ether (p=8), propylene glycol
and water at a ratio of 1/1/15/83 to obtain a water-
disintegrable cleaning sheet.
The resulting cleaning sheet was evaluated in the same
manner as in Example 1, and the results obtained are shown in
Table 4 below.
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COMPARATIVE ~XAMPL~ 3
Thewater-solublebinder-cor.taining-~G er-c sin~egr2ble
shee~ as prepared in Example ~ was im2regnated with an a~ueous
c1ean7ng ager.t comprising polyox~ethylene dcdecyl ether (p=8~,
propylene glycol, and water at a ratio of 1/15/84 in the same
manner as in Exampie 4.
The resulting cleaning sheet was evaluated in the same
manner as in Example 1, and the results obtained are shown in
Table 4 below.
T~BLE 4
Net Tensile
Example Streng~h (q/2577.7~) Dusting and ~ater
No. MD CD Fuzzinq Disintea-ability
Example 12O0 280 o o
Comparative 15 13 x o
~xample 3
EX~PLE 5
Crepe paper having a basis weight of 25 g/m2 (crepe
ratio: 20%) was produced from a raw material comprising 100
parts of parts of NBKP (softwood kraft pulp) and 10 part of
CMC2200 using a cylindrical net~Yankee machine.
The resulting CMC-containing sheet was sprayed with l
part of a 2% calcium chloride aqueous solution per part of the
sheet and dried to obtain a water-disintegrable sheet.
The sheet was impregnated with 1.5 times ~he sheet
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20~) ~29~
weight of a cleaning agent comprising a surfactant (Softanol
70), ethanol, and water (1/20/79). The resul~ing cleanir.g
sheet was evaluated in the same manne. as in Example 1, znd the
results obtained ale shown in Table 5 below.
The C~C-containing crepe paper as described in Exa.~ple
5 was impregnated with 1.5 times the paper weight of the same
clear,ing agent as used in Example 5. The resulting cleaning
sheet was evaluated in the same manner as in Example 1, and ~he
results obtained are shown in Table 5 below.
TABLE 5
Compar~tive
Example 5 Example 4
Wet Tensile Strength
(g/25 mm):
MD 520 50
CD 30
Dusting o x
Water Disintegrability o o
EXAMPLE 6
Toilet paper-like crepe paper having a basis weight of
20 g/m2 (crepe ratio: 10%) was produced from a raw material
comprising 60 parts of NBKP and 40 parts of LBKP (broad-leaved
tree kraft pulp) using a cylindrical net-Yankee machine.
The crepe paper was coated with 3% the paper weight of
CMC2200 with a gravure coater followed by drying to obtain CMC-
containing paper.
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~ ~ O~t~ ~
The CMC-containing paper was uniformly sprayed with 1
part of a 2% aqueous solution of zinc sulfate per part of the
paper and dried to obt~in water-disintegrable paper.
The resulting water-disintegr2ble pa~er was iJmpregnated
wi~h 2.0 times the paper weight of a cleaning agent comprising
a surfactznt (polyoxyethylene dodecyl ether (p=12)), propylene
glycol, and water (2/15/83), and the properties of the
impregnated paper were evalua~ed in the same manner as in
Example 1. The results obtained are shown in Table 6 below.
COMPARATIVE EXAMP_E 5
The CMC-containing paper as prepared in Example 6 was
impregnated with the same cleaning agent as used in Example 6.
The impregnated paper was ev~luated in the same manner as in
Example 1, and the -esu~ts obtained are shol~ ln Table 6 below.
E~MPLE 7
The crepe paper as descri'oed in Exampie 6 was coated
with 3% the paper weight of a 3:1 mixture of CMC2200 and
calcium chloride with a gravure coater and dried to obtain
water-disintegrable paper.
The water disintegrable paper was impregnated with 2.0
times the paper weight of the same cleaning agent as used in
Example 6. The impregnated paper was evaluated in the same
manner as in Example 1, and the results are shown in Table 6
below.
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~00 ~29~i
TABLE 6
Comparative
Example 6 Example 7 Example 5
Wet Tensile Strength (g/25mm):
480 420 55
CD 350
Dustir.g o o x
Water Disintegrability o o o
EXAMPLE 8
A web of spiit and deposited fibers of conifer fluff
pulp (basis weight~ 40 g/m2) was sprayed with 15~ the weight of
a 3:2 mixture of CMC1330 (produced by Daisel K.K.) and calcium
chloride and dried to obtain water-disintegrable payer.
The water-disinte~rable paper was impregnated with 3
times the paper weight of a clean.ng ~oent com~risins
polyethylene dodecyl ether (p=10), ethylene glycol and water
(1il9/80), and the properlies of the impregnated paper were
evaluated in the same manner as in Example 1. The results
ob'ained are shown in Table 7 below.
COMPARATIVE EX~MPLE_6
The web as described in Example 8 was sprayed with 10%
the web weight of CMC1330 and dried. The resulting CMC-
containing paper was impregnated with a cleaning agent in the
same manner as in Example 8. The properties of the impregnated
paper are shown in Table 7.
200~296
TA~LE 7
Comparative
Example 8 Example 6
~et Tensile ~trength ~g/25 mm):
M3 320 18
CD 310 20
Dusting o x
Water Disintegrability o o
EXAMPLE 9
~ he crepe paper as described in Example 6 was coated
with 3~ the paper weight of a monoethanolamine salt of a
methacrylic acid-lauryl methacrylate copolymer (7/3 by mol)
with a gravure coater and dried to obtain water-soluble binder-
containing paper.
The paper was uniformly spr2yed with l part Oc a 2
calcium chlori~e aqueous solution per par~ of the pape- and
dried to o~tain water-dis~ntegrable paper.
The water-disintegr2ble paper was impregnated with 1.5
times the pape- weight of a cleaning agent comprising a
surfactant (dodecyldimethylamine oxide), polyethylene glycol
400 and water (1/20/79). Prcperties of the impregnated paper
were evaluated in the s~me manner as in Example 1, and the
results obtained are shown in Table 8 below.
COMPARATIVE EXAMPLE 7
The water-soluble binder-containing paper as obtained
in Example 9 was impregnated witn a cleaning agent in the same
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Z0~9~i
manner as in Example 9. Properties of the impregnated paper
are shown in Table 8 below.
TABLE 8
Con,parative
Example 9 Exam~le 7
Wet Tensile S-treng~h (g/25 mm):
MD 450 48
CD 310 40
Dusting o x
~ater ~isintegrability o o
EXAMPLE 10
Water-disintegrable crepe paper having a basis weight
of 25 g/m2 (crepe ratio: 15%) was produced from a raw material
comprising 100 parts of NBKP and 10 parts of a water-soluble
carboxymethyl cellulcse scdium-calcium mixed salt (Na:Ca=l~l by
mol; produced by Daisel K.K.) using a cylindrical net-Yankee
machine.
The water-disintegrable paper was ~mpregnated with 1.7
times the paper weight of a cleaning agent comprising a
surfactant (Softanol 90), ethanol and water (1/15/84), and the
impregnated paper was evaluated in the same manner as in
Example 1. The results obtained are shown in Table 9 below.
COMPARATIVE EXAMPLE 8
Water-disintegrable crepe paper having a basis weight
of 25 g/mZ (crepe ratio: 15~) was produced from a raw material
comprising 100 parts of NBKP and 10 parts of a water-soluble
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~OO ~Z9~
sodium carboxymethyl cellulose (produced by Daisel X.K.) using
a cylindrical net-Yankee machine.
The water-disintegrable paper was impregnated with a
cleaning asen ir. the s2me m~nner 2S in Exampl2 10. ~-oper_ies
of the impregnated paper are shown in Table 9.
T~PLE 9
Comparative
Example 10 Example 8
Wet Tensile Strength (g/25 mm):
MD 300 ~5
CD 250 25
Dusting o x
Water Disintegrability o o
EXAMPLE 11
Toilet paper-like crepe pap~r having a basis weight of
20 g/m2 (crepe ratio: 10%) was produced from a raw material
comprising /0 parts of NBRP and 30 parts of LDKP using a
cylindrical net-Yankee machine.
The crepe paper was coated with 3% the paper weight of
a water-soluble carboxymethyl cellulose sodium-zinc mixed salt
(Na:Zn=10/1 by mol; produced by Daisel K.K.) and dried to
obtain water-disintegrable paper.
The water-disintegrable paper was impregnated with 2.0
times the paper weight of a cleaning agent comprising a
surfartant (polyoxyethylene dodecyl ether (p=12)), propylene
glycol and water (2/15/83). The impregnated paper was
9~i
evaluated in the same manner as in Example 1, and the results
obtained are shown in Table 10 below.
COMPARATIVE EXAMPLE 9
The crepe paper 2S described in E~ample 11 was coated
witn 3% the paper weighi of a wa~er-soluble sodium
corbo.Yymethyl cellulose with 2 gravure coater and dried to
obtain water-disintegrable paper.
The water-disintegrable paper was impregnated with a
cleaning agent in the same manner as in Example 11. Properties
of the impregnated paper are shown in Table 10.
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ZC~O,~X9G
EXA~PLE 12
The crepe paper as described in Example 11 was coated
with 3% the paper weight of a water-soluble carboxymethyl
cellulose sodium-calcium mixed salt (Na:Ca-10/1 by mol;
produced by Daisel X.~<.) and dried to obtaill water-
disintegrable paper.
The water-disintegrable paper was impresnated wi~h 2.0
times the paper weight of a cleaning agent comprising
surfactant, propylene glycol and water. The impregnated paper
was evaluated in the same manner as in ~xample 1, and the
results obtained are shown in Table 10 below.
TABLE 10
Comparative
Example 11 Exam?le l2 Example 9
Wet Tensile Strength
(g/25 mm):
MD 320 470 40
CD 250 350 20
Dust ng o o x
Water Disintegrability o o o
EXAMPLE 13
A web of split and deposited fibers of conifer fluff
pulp having a basis weight of 40 g/m2 was sprayed with 10% the
web weight of a water-soluble carboxymethyl cellulose sodium-
calcium mixed salt (Na:Ca=l/1 by mole) and dried to obtain
water-disintegrable paper.
The water-disintegrable paper was impregnated with 3
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ZC~ 3t;
times the paper weight of a cleaning agent comprising a
surfactant (polyethylene dodecyl ether (p=10)), ethylene glycol
and water (1/19/80). The impresnated paper was evaluated in
~he same manner as in ~xample 1, ar.d the results obtain2d a-e
shown in Table 11 below.
CO~IPARATIVE EXAMPLE 10
The web as described in Example 13 was sprayed with 10%
the web weight of a wat2r-soiuble sodium carboxymethyl
ceilulose and dried to obtain water-disintegrable paper.
The water-disintegrable paper was impregnated with a
cleaning agent in the same manner as in Example ~3. Properties
of the impregnated paper are shown in Table 11.
TABLE 11
Compaxative
Example 13 Exam~le 10
Wet Tensile Strength tg/25 mm):
MD 310 10
CD 280 15
Dusting o x
Water Disintegrability o o
EXAMPLE 14
The crepe paper as described in Example 11 was coated
with 3% the paper weight of a water-soluble methacxylic acid-
lauryl methacrylate copolymer (7/3 by mol) potassium-calcium
mixed salt (K:Ca=1/1 by mole) with a gravure coater and dried
to obtain water-disintegrable paper.
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2~ 2~,
The water-disintegrable paper was impregnated with 1.5
times the paper weight of a cleaning agent comprising a
surfactant (dodecyldimethylamine oxide), polyethylene glycol
400 a..d water (1/19/80), and the impregnated pape- was
evaluated in the same manner as in Example 1. The resul's
obtained are shown in Table 12 below.
COMPARATIVE EXAMPLE 11
The crepe paper as described in Example 11 was coated
with 3% of a methacrylic acid-lauryl methacrylate copolymer
(7/3 by mol) sodium salt and dried to cbtain water-soluble
binder-containing paper.
The water-soluble binder-containing paper was
impregnated with a cle~ning agent in the same manner as in
Example 14. Properties o~ the impregnated paper are shown in
Table 12 below.
TABLE 12
Comparative
Example 14 Exam~le 11
Wet Tensile Strength (g/25 mm):
MD 410 36
CD 280 25
Dusting o x
Water Disintegrability o o
EXAMPLE 15
A water-disintegrable paper shee~ having a basis weight
of 25 g/m2 was produced from a bleached kraft pulp of conifer
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'~00'~2~6
beaten to a CSF (Canadian Standard Freeness) of 680 cc using an
ordinary paper machine.
The water-disintegrable paper sheet was sprayed with 3%
~he paper weisht (corresponding to 0.75 g/m2) of a scdium
carboxyr,ethyl cellulose "CMC 1330" (produced by Daisel Kagaku
K.K.) in the form of a 1% aqueous solution and dried to obtain
a CMC-containing sheet.
Separately, the water-disintegrable paper sheet was
sprayed with 3% the paper weighl (corresponding to 0.75 g/m2)
of a sodium polyacrylate having a mean molecular weight of
135,000 (produced by Aldrich Chemical Company, Inc.) in the
form of a 1~ aqueous solution and dried to obtain a
polyacrylate-containing sheet.
The CMC-containing sheet and the polyacrylate-
containing sheet were impregnated with 1.7 times the sheet
weight of a cleaning agent comprising calcium chloride,
polyoxyethylene dodocylether (p=8), ethanol and water
(l/l/20/78) to obtain a water-disinteyrable cleaning sheet.
Wet tensile strength, dusting and fuzzing on use, and
water disintegrability of the resulting cleaning sheet were
evaluated in accordance with the following test methods. The
results obtained are shown in Table 13 below.
1. Wet Tensile Strenqth:
The same as in Example 1.
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20(~ ~Z9~i
2. _Dustinq and Fuæzinq:
The same as in Example 1.
3. Water Disinteqràbility.
In 1 R-volume beaker was put 500 m~ of tap water and a
Teflon coated stirrer bar, and agitated by means of a magnetic
stirrer at 300 rpm.
The cleaning sheet was cut to pieces of 50 mm x 50 mm
and put into the water under stirring. The time required for
collapse (water disintegration) of the sheet in water was
measured.
COMPARATIVE EXAMPLE 12
The water-disintegrable paper sheet as described in
Example 15 was sprayed with 3% the paper weight (corresponding
to 0.75 g/m~) of carrageenan having a mean molecular weight of
300,000 (produced by Tokyo Kasei R.K.) in the form of a 1%
aqueous solution and dried to obtain a carrageenan-containing
sheet.
The carrageenan-containing sheet was impregnated with
a cleaning agent in the same manner as in Example 15.
Properties of the impregnated paper are shown in Table 13
below.
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Z~ 9~
TABLE 13
Wet Tensile Dusting Water
Strenath (q~2~mm! and Disinte-
MD _ CD Fuzzin~qrability
Exa.T~le 15 (sec.)
CMC-containing430 270 o 14
Sheet
~olyacrylic aci.d- 620 390 o 45
containing Sheet
Comparative
Example 12
Carrageenan- i8 46 ~ 17
containing
Sheet
While t~le invention has been described in detail and
with reference to specific embodiments thereof, it will be
apoarent to one skilled in the art that various changes and
modifications can be made therein without departing from the
spirit and scope thereof.
33
