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US4271064A
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Modified polyester compositions
Assignee: General Electric Co
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Filing: 1979-01-08
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Granted: 1981-06-02
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Expires: 1999-01-08
Abstract
Abstract Modified thermoplastic polyester compositions are provided which comprise (a) a poly(1,4-butylene terephthalate) resin or polyester copolymer and, optionally, a poly(ethylene terephthalate) resin and (b) a modifier therefor comprising a combination of a selectively hydrogenated block copolymer resin of a vinyl aromatic monomer (A) and a conjugated diene (B) of the A-B type, and an aromatic polycarbonate, and, optionally (c) filler and/or reinforcing agent 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
2026-10-31 07:09
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/02
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
123 words
A thermoplastic composition consisting essentially of: (a) a polyester composition consisting essentially of: (i) a poly(1,4-butylene terephthalate) resin; (ii) a blend of a poly(1,4-butylene terephthalate) resin and a poly(ethylene terephthalate) resin; (iii) a block copolyester of poly(1,4-butylene terephthalate) and an aromatic/aliphatic or aliphatic polyester; (iv) a blend of (iii) and a poly(ethylene terephthalate) resin; or (v) a blend of (iii) and a poly-(1,4-butylene terephthalate) resin; and (b) an impact modifier therefor consisting essentially of a combination of: (i) a selectively hydrogenated block copolymer resin of a vinyl aromatic monomer (A) and a conjugated diene (B) of the A-B type; and (ii) an aromatic polycarbonate resin, in an amount of up to 60 parts per 100 parts by weight of (a) and (b) together.
Claim 2
Dependent Claim
123 words
A thermoplastic composition consisting essentially of: (a) a polyester composition consisting essentially of: (i) a poly(1,4-butylene terephthalate) resin; (ii) a blend of a poly(1,4-butylene terephthalate) resin and a poly(ethylene terephthalate) resin; (iii) a block copolyester of poly(1,4-butylene terephthalate) and an aromatic/aliphatic or aliphatic polyester; (iv) a blend of (iii) and a poly(ethylene terephthalate) resin; or (v) a blend of (iii) and a poly-(1,4-butylene terephthalate) resin; and (b) an impact modifier therefor consisting essentially of a combination of: (i) a selectively hydrogenated block copolymer resin of a vinyl aromatic monomer (A) and a conjugated diene (B) of the A-B type; and (ii) an aromatic polycarbonate resin, in an amount of up to 60 parts per 100 parts by weight of (a) and (b) together.
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
36 words
A composition as defined in claim 1 wherein the 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
22 words
A composition as defined in claim 1 wherein in components (a)(i), (a)(ii) and (a)(v), 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
26 words
A composition as defined in claim 1 wherein said block copolymer resin component (b)(i) includes (A) units derived from styrene and (B) units derived from butadiene.
Claim 10
Dependent Claim
17 words
A composition as defined in claim 1 wherein said aromatic polycarbonate resin includes units derived from bisphenol-A.
Claim 11
Dependent Claim
43 words
A composition as defined in claim 1 which also includes (c) a filler, reinforcing agent or a mixture thereof 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 12
Dependent Claim
15 words
A thermoplastic composition as defined in claim 10 wherein component (c) comprises (c)(i) fibrous glass.
Claim 13
Dependent Claim
14 words
A thermoplastic composition as defined in claim 10 wherein component (c) comprises (c)(ii) clay.
Claim 14
Dependent Claim
19 words
A composition as defined in claim 1 which also includes (d) a flame-retardant amount of a flame retardant agent.
Claim 15
Dependent Claim
38 words
A composition as defined in claim 13 wherein component (d) comprises an aromatic polycarbonate containing units of tetrabromobisphenol-A and said units are present in said composition in an amount at least sufficient to render the composition flame retardant.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-06-01 | 1984-12-01 | 1985-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-01 | 1988-12-01 | 1989-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-01 | 1992-12-01 | 1993-06-02 | $7700.00 | Window Closed / Lapsed |