US4280948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modified polyester compositions
Assignee: General Electric Co
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Filing: 1979-02-02
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Granted: 1981-07-28
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Expires: 1999-02-02
Abstract
Abstract Modified thermoplastic polyester compositions are provided which comprise (a) a block poly(1,4-butylene terephthalate) ester copolymer or blend thereof with a linear polyester and (b) a modifier therefor comprising a combination of an acrylic or methacrylic grafted polymer of a conjugated diene, alone or in combination with a vinyl aromatic and an aromatic polycarbonate. The compositions can include (c) reinforcing glass fibers and/or (d) a flame retardant. Modifier (b) provides enhanced resistance to impact fracture, increased strength and improved resistance to heat distortion in articles molded from the compositions.
Inventors
- 👤 Ronald L. Dieck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:52
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/02
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
119 words
A thermoplastic composition comprising: (a) a polyester composition comprising: (i) a block copolyester of poly(1,4-butylene terephthalate) and an aromatic/aliphatic or aliphatic polyester; (ii) a blend of (i) and a poly(ethylene terephthalate) resin; or (iii) a blend of (i) and a poly(1,4-butylene terephtthalate) resin; and (b) an impact modifier therefor comprising a combination of: (i) an acrylic or methacrylic monomer grafted polymer of a conjugated diene, alone or in combination with a vinyl monomer; and (ii) an aromatic polycarbonate resin, said impact modifier (b) being present in an amount of up to 60 parts per 100 parts by weight of (a) and (b) together, the weight ratio of said grafted polymer to said polycarbonate resin being between 1:99 and 99:1.
Claim 2
Dependent Claim
119 words
A thermoplastic composition comprising: (a) a polyester composition comprising: (i) a block copolyester of poly(1,4-butylene terephthalate) and an aromatic/aliphatic or aliphatic polyester; (ii) a blend of (i) and a poly(ethylene terephthalate) resin; or (iii) a blend of (i) and a poly(1,4-butylene terephtthalate) resin; and (b) an impact modifier therefor comprising a combination of: (i) an acrylic or methacrylic monomer grafted polymer of a conjugated diene, alone or in combination with a vinyl monomer; and (ii) an aromatic polycarbonate resin, said impact modifier (b) being present in an amount of up to 60 parts per 100 parts by weight of (a) and (b) together, the weight ratio of said grafted polymer to said polycarbonate resin being between 1:99 and 99:1.
Claim 3
Dependent Claim
35 words
A composition as defined in claim 1 wherein the impact modifier (b) is present in an amount of at least about 1.0 parts by weight per 100 parts by weight of (a) and (b) together.
Claim 4
Dependent Claim
37 words
A composition as defined in claim 1 wherein the impact modifier (b) is present in an amount of from about 2.5 to about 50 parts by weight per 100 parts by weight of (a) and (b) together.
Claim 5
Dependent Claim
40 words
A composition as defined in claim 1 wherein each said polyester in component (a) has an intrinsic viscosity of at least about 0.4 deciliters/gram when measured in a solution in a 60:40 mixture of phenol and tetrachloroethane at 30° C.
Claim 6
Dependent Claim
42 words
A composition as defined in claim 4 wherein each said polyester in component (a) has an intrinsic viscosity of at least about 0.6 deciliters per gram when measured in a solution in a 60:40 mixture of phenol and tetrachloroethane at 30° C.
Claim 7
Dependent Claim
19 words
A composition as defined in claim 1 wherein, in component (a)(iii), said poly(1,4-butylene terephthalate) resin is linear or branched.
Claim 8
Dependent Claim
35 words
A composition as defined in claim 6 wherein said branched polyester is a high melt viscosity (1,4-butylene terephthalate) resin which includes a small amount of a branching component containing at least three ester forming groups.
Claim 9
Dependent Claim
40 words
A composition as defined in claim 1 wherein in said graft copolymer resin component (b)(i), the conjugated diene polymer comprises, butadiene or isoprene, alone or in combination with a vinyl aromatic compound and the grafted monomer is a methacrylic monomer.
Claim 10
Dependent Claim
24 words
A composition as defined in claim 8 wherein said graft copolymer comprises units of butadiene, styrene and a C 1 -C 6 alkyl methacrylate.
Claim 11
Dependent Claim
20 words
A composition as defined in claim 9 wherein in said graft copolymer the C 1 -C 6 methacrylate is methyl.
Claim 12
Dependent Claim
17 words
A composition as defined in claim 1 wherein said aromatic polycarbonate resin includes units derived from bisphenol-A.
Claim 13
Dependent Claim
39 words
A composition as defined in claim 1 which also includes (c) fibrous glass reinforcing agent in an amount of from about 1 to about 60 parts by weight per 100 parts by weight of (a), (b) and (c) together.
Claim 14
Dependent Claim
19 words
A composition as defined in claim 1 which also includes (d) a flame-retardant amount of a flame retarding agent.
Claim 15
Dependent Claim
49 words
A composition as defined in claim 1 which also includes (c) fibrous glass reinforcing agent in an amount of from about 1 to about 60 parts by weight per 100 parts by weight of (a), (b) and (c) together and (d) a flame-retardant amount of a flame retarding agent.
References Cited (Backward Citations)
US2465319A
Cited
US4097446A
Cited
US3953394B1
Cited
US3953394A
Cited
US3833685A
Cited
US3864428A
Cited
GB1417805A
Cited
US3953404A
Cited
US3950301A
Cited
US4022748A
Cited
US4044073A
Cited
US4034013A
Cited
US4090996A
Cited
US4096202A
Cited
US4096202B1
Cited
US4034016A
Cited
US4125572A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-07-27 | 1985-01-26 | 1985-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-27 | 1989-01-26 | 1989-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-27 | 1993-01-26 | 1993-07-28 | $7700.00 | Window Closed / Lapsed |