Note: Descriptions are shown in the official language in which they were submitted.
669~
8CII-2390
This invention provides a novel thermoplastic
molding composition which comprises poly(l,4-
butylene terephthalate), and a poly(diarylene-
alkylene isophthalate~ resin, alone, or in
combination with a reinforcing amount of a
reinforcing filler.
Poly(1,4-butylene terephthalate) resins
are well known and have been widely employed
for the production of thermoplastic molded
articles. Also, reinforced compositions of
poly(l,4-butylene terephthalate) have been
commercially available for a number of years.
These compositions are useful for a plurality
of applications especially when a high degree
of solvent resistance is required. Glass
fiber reinforced poly(l,4~butylene terephthalate)
when molded into various articles has a tendency
to become distorted or warped especially
when the molded article has a thin section.
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8CM~2390
l ll It has been found that if a polytdiarylenealkylene
2 ¦1 isophthalate) resin is added to the reinforced poly(l,4-butylene
3 1I terephthalate) molding composition, the molded articles are
4 l¦ substantially resistant to warpage or dic:tortion af~er they
S 1l are re~oved from the ~old. In unreinforc:ed modifications,
6 l¦ there is no reduction in heat deflection temperature under
7 ¦¦ load. These results are achieved without: any appreciable decrease
8 1¦ in the mechanical, physical or molding properties of a typical
9 ¦~ poly(l,4 butylene terephthalate) moldin~ compositions, whether
ll or not they contain reinforcing agents.
12 I Detailed Deseription of the Invention. The present
13 l invention provides a novel thermoplastic molding composition
14 ll which comprises:
(a) poly(l,4-bu~ylene terephthalate) and
1~ 1! (b) a poly(diarylenealkylene isophthalate) resin.
1'~ 1'1 .
18 !l A preferred embodiment will also include
19 lll (c) a reinforcing amount of a reinforcing agent.
21 l¦ The poly(l,4-butylene terephthalate) should have an
22 11 intrinsic viscosity between 0.4 and 1.2 dl/g. as measured at
23 !l 30C. in a 60/40 solution of phenol/tetrachloroethane. ~ more
24 l¦ preferred range is between 0.6 and 0.9 dl/g.
25 ll The poly(diarylenealk~Jlene isophthalate) resin has
Z6 recurring units of the formula:
.8 ~l -R-C-R-0-l - ~C-0-
: !
30,
!l !
.
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~c~-2390
1 whcrein each -R- is selected from the grou~ consisting of
2 1 phen~lene, halo-substituced phenylene and alkyl substituted
3 ¦ phenylene, and X and Y are each selected from the group consist-
4 1¦ ing of hydrogen, hydrocarbon radicals free from aliphatic un-
!; sa~uration and of radicals which together with the adjoining
6 1 .
7 ~ C -
'' 8i, 1
9 1l atom form a cycloalkane radical, the total number of carbon
atoms in X and Y being up to 12.
12 !I The preferred poly(diarylenealkylene isophthalate) .
13 1! resins may be derived from the reaction of bisphenol-A and
14 1l i50phthallc acid or a reactive derivative thereof, such as
lS 1l isophthaloyl chloride, dimethyl isophthalate and the like.
16 I, These preferably will have from 100-4oo recurring units of the
17 ¦I formula:
1~ Ij ~
19 ~ H3 ~ 8
20 ll ~ o ~ ~ 3 0 --C ~ C- ~_
21 ll CH3
22 11
23 jl The poly(diarylenealkylene isophthalates) can be
24 ,¦ prepared by ~hose skilled in this art using conventional tech-
25 ¦¦ niques. They should have an intrinsic viscosity between 0.3
26 I,l and 1.0, preferably from 0.3 to 0.45 as measured at 20C. in
27 1 methylene chloride.
: 28 1 .
29 Th~ relnforcinp, ~p~ents ln the optional embo~imcnt~
I may be selectQ~ from finely di.vided alumlnum, iron or nickel
'i . Il
~ 3 -
~ ~; . , : . . . . . . .
~ 8C~ 2390
and the like, and non-meta]s, such as carbon filaments, ~
cates, such as acicular calcium silica-te, asbestos, titaniurn
dioxide, wollas-tonite, po~assium ti-canate ancl titana-te ~hiskers,
glass rlakes ancl L ibers.
Al~hough it is only necessary to use a reinforcing
amount of the reinrorcing agent, Erom 1-60 parts by weight of
the total weight of the composition may comprise the reinforcing
agent. A preferred range is from 5-40 parts by weight. T,~len
used herein, parts by weight are based on 100 par-ts by weight
in total composition.
The preferred reinforcing agents are of glass, and
j it is preferred to use fibrous glass filaments. The preferred
ilaments for plastics reinforcement are made by mechanical
pulling. The filament diameters range rom about 0.000112
to about 0.00075 inch, but this is not critical to the present
invention.
- The poly-(1,4-butylene terephthalate) resin may
comprise from 95 to 20 parts by weight of the composition and
the poly(diarylenealkylene isophthalate) resin may comprise
from 5 to 80 parts by weight of the resinous components (a)
and (b) in the composition.
The preferred compositions will include rom
90 to 65 parts by weight of poly(l,4-butylene terephthalate)
and from 10 to 35 parts by weight of the poly(diarylene-
alkylene isophthalate) resin.
The composition may be prepared by any s~andard
procedure and the particular method employed is not critical,
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8CM-2390
1 The compositions may also include flame retardants
2 such as those disclosed in U.S. Patent No. 3,915,926, dated
3 October 28, 1975.
4 I . .
5 I _escription of the Preferred Embodiments. - The
6 Ifollowing examples illustrate compositions within the scope
7 ,of this invention. They are not to be construed as limiting
8 ¦the claims thereto. In the data tables, "N.D.I' means --
9 ¦not determined.
10! . .
1l EXAMPLE 1
12
13 The following compositio~s are prepared by blending
14 the materials in an extruder:
l,~i , Exam le
l~ Compositio ~ ts by weight) 1 lA (control)
17 ¦poly(1,4-butylene terephthalat~)* 55 70
18 ¦¦poly(4,4'-diphenylene propane
lisophthalate) resin** 15
glass fibers 1/8'l(0wens Corning
21 OCF 419, 1/8") 30 30
22 pho~phite stabilizer*** 0 05 0 05
23
24 ¦ These compositions have the following physîcal proper-
2S jties after injection molding in~o test pieces:
_
27 * Intrinsic viscosity, 0.8 dl./g.
28 ** Polyarylate U-Polymer, U-1060, product uf
Unitik~ Company, Japan.
29 TM
30 1*** Ferro 904.
I
I - 5
"
:-` '
.. ' "~ ~3C~1-2390
1 Properties 1
2 Speclfic Gravity, g./cc. 1.512 1.542
3 Deflection temperature
4 at 2~4 psi, F. 344 . 396
Warpage, 1/16" X 4"
diameter disc,
6 mm., as molded 0 20
7 mm., after 30 min. a~ 350F. 17 25
8 Notched Izod impact, 1.9 1.8
- f~. lbis./in. . .
9 . '
10 ~ Unnotched Izod impact, 17.1 14.5
11 I . .
12 I Flexural strength, psi. 25,600 26,800
13. ¦ Flexural modulusl psi. 971,000 993,000
14 Tensile s~rength, psi. . . . 16,400 18,000
15 Elongation at break, ~/0 N.D. N.D.
l'j .
17 EXAMPLE 2
18 The f3110wing composition is preparad by blending
19 the materials in an extruder:
' Composition (~ts by wei~ht)
21 I poly(l,4-butylene tereph~ha~ate)* 40
22 ¦! poly(4,4'diphenylenepropane iso- .
23 ¦ phthalate~ resin** 30
24 ¦ glass fibers 1/8" ~Owens Corning, .
OCF 419, 1/8") 30
27 stabilizer~'~** . 0 05
I ~
28 * Intrinsic viscosity, 0.8dl /g,
2g ~* Polyarylate U-Polymer, U-1060, product
I of Unltika Co~pany, Japan.
30 l' **.* Ferro 904.
Il - 6 -
I
I'
~ i611Ei
¦ 3C H- 2 3 9 0
l This composition has the following physical properties
2 I after in]ection molding:
3 ¦ Properties
Specific Gravity, g./cc. 1.483
'i Deflection temperature at
6 264 psi, F. 160
7 1 Warpage, 1/16" X 4"
l diameter disc,
8 mm., as molded 0
9 mm., after 30 min. at 350F. 19
Notched Izod impact
ll ft. lbs.lin. 2.1
l~ Unnotched Izod impact,
13 ft. lbs./in. 15.3
14 Flexural strength, psi. 27,300
lS Flexural modulus, psi. 1,061,000
16 Tensile strength, psi. 17,200
17 Elongation at break, % N.D.
18
19 ¦ EXAMPLE 3
20 i The following unreinforce~ compositions are prepared
21 by blending ~he materials in an extruder:
22 1 Example
23 ¦ Composition (parts by wei~ht~ 3 ~ control)
24 1 poly(l,4-butylene terephthalate)* 80 100
poly(4,4'-diphenylenepropane iso-
26 ~ phthalate)resin** 20 ---
27 stabilizer*** 0.05 0.05
28
. -- .
29 * Intrinsic viscosity, 1.1 dl./~.
** Polyarylate U Polymer, U-1060, product of
'( Unitika Company, Japan.
31 ~ *** Ferr~ 904.
&;i6~
. ~ 8CH-2390
1 These compositio~s have the following physical
2 properties a~ter injection molding:
3 Properties 3 3A (control)
Specific Gravity, g,/cc. 1.287 1.31
Deflection temperature
6 at 264 psi, F. 149 136
7 Warpage, 1/16" X 4" .
diameter disc,
8 1 mm., as molded 0 0
9 mm., after 30 min. at 350F. distorted 15
10 ~ Notched Izod impact,
11 ~ ft. lbs./in. 1.2 1.2 . .
12 Unnotched Izod impact,
13 ft. lbs./in. break break
14 Flexural strength, psi. 12,500 12,600
Flexural modulus, psi. 334,000 351,000
1~ Tensile strength,psiO 8,300 8,100
17 Elongation at break, % 135 307
.1~
19 Although the above examples have shown various
modifications of the present invention, other variations are
21 ¦ possible in the light of the above teachings. I~ is, therefore,
22 to be understood that changes may be made in the particular
23 embodiments of the invention described which are within the
24 full intended scope of the invention as defined by the appended
claims.
29
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