Note: Descriptions are shown in the official language in which they were submitted.
C 7084 (R~
13~17~1
"ACIDIC LIQUID CLEANING COMPOSITION"
The present invention relates to aqueou~, acidic liquid
cleaning compo~itions which are 3uitable for cleaning
hard, acid-re~iqtant surface~ such a3 metallic,
vitreous and ceramic surface~. They are especially
~uitable for cleaning toilet bowl~.
Acidic liquid toilet bowl cleaning compo4itions are
well known in the art. They u3ually conqist of an
aqueou~ solution of a strong acid, to which various
de~irable additive3 have been added, such as detergent-
active compound~, germicides, perfumes, corrosion
inhibitor~, colouring agents and so on. As detergent-
active compounds anionic, nonioniç and cationic
detergents have been su~gested fcr inclusion in quch
acidic liquid toilet bowl cleaning compo~ition~. When
desired, a plea~ing colour i~ imparted to such
compo~itions by adding a suitable dye, such as a blue
dye. Such compo~ition~ are particularly effective in
removing toilet ~cale deposits, derived from the water
~upply to the toilet.
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In order to enable the user of these composition~ to
monitor the concentration of ~uch products in the water
upon dilution when u3ing these product~, it would be
de~irable to include an ingredient giving the u~er a
readily appreciated rating of the concentration
present. Such an ingredient would be a pH indicator,
the colour of which changes upon dilution, as i3 for
instance suggeAted for liquid detergents in Ga Patent
Specification 1 313 180.
However, we have found that the performance of quch a
colour change providing ingredient in acidic toi~et
~ bowl cleaner~ i8 related to the nature of the
-~ 35 detergent-active compound pre~ent in the composit~ons,
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- C 7084 (~)
2 13297~
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and that such a colour change is only obtained if the
compo~i~ion contains a detergent-active compound that
exists in a cationic form under the acidic conditions
of the co~po3ition. Cationic surfactants are
particularly advantageous in acidic toilet cleaning
; compo~it~ons because of their known germicidal
properties.
Consequently, the pre~ent invention in it3 broadest
aapect~ relate~ to an aqueouY, acidic liquid cleaning
co~position comprising an aqueous ~olution of a strong
acid, a detergent-active compound and a dye, which i~
characterised by the fact that the detergent-active
compound exists in a cationic form in the composition
and that the dye undergoes a pH-dependent colour change
in the acid pH range.
Detergent-active compounds which are cationic under the
acidic conditions in the composition are e.g. permanent
cationics ~uch as the quaternary ammonium and
imidazoline compounds, or tertiary amines, tertiary
~ amine oxides, amine ethoxylates, betaines and
; sulphobetaines. Specific examples are coconut dimethyl
l amine-oxide, coconut trimethyl quaternary ammonium
- 25 chloride, coconut sulphobetaine.
In general, the compositions contain the cationic
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detergent-active compound in an amount of 0.1-10% by
weight. Mixtureq of several cationic detergents, as
well as of a cationic and a nonionic detergent may alqo
be used.
The dyestuffs quitable or use according to the present
invention are those which undergo a pH-dependent colour
' 35 change in the acid pH range, i.e. for the present
-~ invention in the range of 2-6 in aqueous solution.
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- C 7084 (R)
~ 3 ~ 32~7~1
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Typical examples of ~uch dye~tuffs are the
triarylmethane types quch as Acid Blue 1 (CI 420~5),
Acid Blue 9 (CI 42090), Acid Violet 17 (CI 42650) and
Mordant 31ue 1 (CI 43830)o In general, the compo~itions
contain from 0.0001-1~ by weight of the dyestuff.
Optionally, other dyestuffs which do not undergo a pH-
dependent colour change may additionally be included so
` ~ as to achieve a change to a desired colour.
As strong acid, inorganic acid~ ~uch as hydrochloric
acid, sulphuric acid, nitric acid and ~ulphamic acid
are quitable: the compositions contain the acid in an
amount of 0.5-25% by weight. The pH of the compositions
of the present invention i~ below 2, and in most useful
cases below 1.
Other optional ingredients may also be included, such
as perfumeq, corrosion inhibitors, viscosity modifiers,
electrolyte salts, small amounts of anionic detergents,
~olvents, hydrotropes etc. Thickened compositions are
especially desirable ~ince they remain in contact with
vertical and inclined Qurfaces of the toilet for a
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longer period of time and give improved cleaning. The
compo5~tion~ of the invention can be thickened by
surfactants, by polymeric materials such as xanthan
gum , polyacrylate~ and by inorganic thickeners quch as
8~ lica~ and clays.
Examples 1-13
The following table qhowq a number of compo~ition~ of
the present invention which undergo colour change upon
; dilution with water. The figures are percentageq by
~ weight.
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