US4855357A
Expired / Lapsed
US
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Low-temperature impact blends of polycarbonate, graft copolymer and rigid copolymer
Assignee: General Electric Co
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Filing: 1988-10-12
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Granted: 1989-08-08
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Expires: 2008-10-12
Abstract
Abstract Polymer blend compositions comprising a polycarbonate, a graft copolymer and a rigid copolymer exhibit improved low-temperature impact properties. The polycarbonate has a weight average molecular weight, Mw, not less than 35,000 and the rigid copolymer has a weight average molecular weight, Mw, not less than 130,000. The graft copolymer is formed from at least two ethylenically unsaturated monomers graft polymerized to a rubbery polymer substrate. The rigid copolymer is formed from at least two ethylenically unsaturated monomers and is compatible with the graft copolymer.
Inventors
- 👤 David Whalen
- 👤 Ronald L. Jalbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:39
CPC Classifications
C; C08; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/08; C08L25/12; C08L51/00; C08L51/04; C08L69/00; C08L55/00; C08L55/02
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
89 words
A polymer blend composition, comprising (a) a polycarbonate polymer having a weight average molecular weight, Mw, as measured by gel permeation chromatography techniques, of not less than 35,000; (b) a graft copolymer formed from at least two ethylenically unsaturated monomers graft polymerized to a rubbery polymer substrate; and (c) a rigid copolymer formed from at least two ethylenically unsaturated monomers, the rigid copolymer being compatible with the graft copolymer and having a weight average molecular weight, Mw, as measured by gel permeation chromatography techniques, of not less than 130,000.
Claim 2
Dependent Claim
89 words
A polymer blend composition, comprising (a) a polycarbonate polymer having a weight average molecular weight, Mw, as measured by gel permeation chromatography techniques, of not less than 35,000; (b) a graft copolymer formed from at least two ethylenically unsaturated monomers graft polymerized to a rubbery polymer substrate; and (c) a rigid copolymer formed from at least two ethylenically unsaturated monomers, the rigid copolymer being compatible with the graft copolymer and having a weight average molecular weight, Mw, as measured by gel permeation chromatography techniques, of not less than 130,000.
Claim 3
Dependent Claim
58 words
A polymer blend composition as defined by claim 1, comprising from about 10 to about 90 percent by weight of the polycarbonate polymer, from about 1 to about 80 percent by weight of the graft copolymer, and from about 5 to about 80 percent by weight of the rigid copolymer, based on the polycarbonate, graft and rigid components.
Claim 4
Dependent Claim
55 words
A polymer blend composition as defined by claim 2, comprising from about 40 to about 80 percent by weight of the polycarbonate, from about 5 to about 50 weight percent of the graft polymer, and from about 5 to about 50 weight percent of the rigid copolymer, based on the polycarbonate, graft and rigid components.
Claim 5
Dependent Claim
20 words
A polymer blend composition as defined by claim 1, wherein the polycarbonate polymer comprises a homopolymer or copolymer of bisphenol-A.
Claim 6
Dependent Claim
21 words
A polymer blend composition as defined by claim 1, wherein the polycarbonate polymer comprises a homopolymer or copolymer of halogenated bisphenol-A.
Claim 7
Dependent Claim
30 words
A polymer blend composition as defined by claim 1, wherein the graft copolymer comprises a rubbery polymer substrate selected from the group consisting of polybutadiene, polybutadiene-styrene, polybutylacrylate and ethylene-propylene-norborene polymers.
Claim 8
Dependent Claim
16 words
A polymer blend composition as defined by claim 6, wherein the rubbery polymer substrate comprises polybutadiene.
Claim 9
Dependent Claim
44 words
A polymer blend composition as defined by claim 1, wherein the graft copolymer comprises a graft portion formed from at least two ethylenically unsaturated monomers selected from the group consisting of styrene, alpha-methylstyrene, dibromostyrene, methyl methacrylate, acrylonitrile, maleic anhydride, maleimide, N-phenyl maleimide and acrylamide.
Claim 10
Dependent Claim
56 words
A polymer blend composition as defined by claim 8, wherein the graft portion is formed from at least one first monomer selected from the group consisting of styrene, alpha-methylstyrene, dibromostyrene and methyl methacrylate, and at least one second different monomer selected from the group consisting of acrylonitrile, methyl methacrylate, maleic anhydride, maleimide, N-phenyl maleimide and acrylamide.
Claim 11
Dependent Claim
19 words
A polymer blend composition as defined by claim 9, wherein the graft portion is formed from styrene and acrylonitrile.
Claim 12
Dependent Claim
40 words
A polymer blend composition as defined by claim 9, wherein the graft portion is formed from about 60 to about 95 weight percent of the first monomer and from about 5 to about 40 weight percent of the second monomer.
Claim 13
Dependent Claim
49 words
A polymer blend composition as defined by claim 1, wherein the graft copolymer comprises from about 40 to about 80 weight percent of the rubbery substrate polymer and from about 20 to about 60 weight percent of the graft portion, based on the rubbery substrate and the graft portion.
Claim 14
Dependent Claim
42 words
A polymer blend composition as defined by claim 1, wherein the rigid copolymer is formed from at least two ethylenically unsaturated monomers selected from the group consisting of styrene, alpha-methyl styrene, dibromostyrene, methyl methacrylate, acrylonitrile, maleic anhydride, maleimide, N-phenyl maleimide and acrylamide.
Claim 15
Dependent Claim
56 words
A polymer blend composition as defined by claim 13, wherein the rigid copolymer is formed from at least one first monomer selected from the group consisting of styrene, alpha-methylstyrene, dibromostyrene and methyl methacrylate, and at least one second different monomer selected from the group consisting of acrylonitrile, methyl methacrylate, maleic anhydride, maleimide, N-phenyl maleimide and acrylamide.
Claim 16
Dependent Claim
19 words
A polymer blend composition as defined by claim 14, wherein the rigid copolymer is formed from styrene and acrylonitrile.
Claim 17
Dependent Claim
40 words
A polymer blend composition as defined by claim 14, wherein the rigid copolymer is formed from about 60 to about 95 weight percent of the first monomer and from about 5 to about 40 weight percent of the second monomer.
Claim 18
Dependent Claim
103 words
A polymer blend composition, comprising (a) from about 40 to about 80 weight percent of a polycarbonate polymer having a weight average molecular weight, Mw, as measured by gel permeation chromatography techniques, of not less than 35,000; (b) from about 5 to about 50 weight percent of a graft copolymer comprising a butadiene substrate and a graft portion formed from styrene and acrylonitrile; and (c) from about 5 to about 50 weight percent of a rigid copolymer formed from styrene and acrylonitrile, the rigid copolymer having a weight average molecular weight, Mw, as measured by gel permeation techniques, of not less than 130,000.
Claim 19
Dependent Claim
103 words
A polymer blend composition, comprising (a) from about 40 to about 80 weight percent of a polycarbonate polymer having a weight average molecular weight, Mw, as measured by gel permeation chromatography techniques, of not less than 35,000; (b) from about 5 to about 50 weight percent of a graft copolymer comprising a butadiene substrate and a graft portion formed from styrene and acrylonitrile; and (c) from about 5 to about 50 weight percent of a rigid copolymer formed from styrene and acrylonitrile, the rigid copolymer having a weight average molecular weight, Mw, as measured by gel permeation techniques, of not less than 130,000.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-07 | 1993-02-06 | 1993-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-07 | 1997-02-06 | 1997-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-07 | 2001-02-06 | 2001-08-08 | $7700.00 | Window Closed / Lapsed |