US4267286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modified polyester compositions
Assignee: General Electric Co
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Filing: 1979-07-03
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Granted: 1981-05-12
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Expires: 1999-07-03
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 polyacrylate resin or a vinyl aromatic-diene block copolymer resin and a poly(1,3-butylene terephthalate), and, optionally (c) filler and/or reinforcing agent and/or (d) a flame retardant or combination of flame retardants. Modifier (b) provides enhanced resistance to impact fracture in articles molded from the compositions.
Inventors
- 👤 Richard W. Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:07
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
106 words
A thermoplastic composition comprising: (a) a polyester composition comprising: (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 comprising a combination of: (i) a polyacrylate resin or a vinyl aromatic-diene block copolymer resin; and (ii) a poly(1,3-butylene terephthalate) resin, in an amount of up to 60 parts per 100 parts by weight of (a) and (b) together.
Claim 2
Dependent Claim
106 words
A thermoplastic composition comprising: (a) a polyester composition comprising: (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 comprising a combination of: (i) a polyacrylate resin or a vinyl aromatic-diene block copolymer resin; and (ii) a poly(1,3-butylene terephthalate) 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 0.6 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 0.8 deciliters per gram when measured in a solution in a 60:40 mixture of phenol and tetrachloroethane at 30° C.
Claim 7
Dependent Claim
36 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 includes a small amount of a branching component containing at least three ester forming groups.
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
19 words
A composition as defined in claim 1 wherein said polyacrylate resin component (b)(i) includes units derived from n-butyl acrylate.
Claim 10
Dependent Claim
26 words
A composition as defined in claim 1 wherein said polyacrylate comprises a multiple stage polymer having a rubbery first stage and a thermoplastic hard final stage.
Claim 11
Dependent Claim
26 words
A composition as defined in claim 1 wherein said vinyl aromatic-diene block copolymer resin comprises units of styrene and units of butadiene and is selectively hydrogenated.
Claim 12
Dependent Claim
18 words
A composition as defined in claim 1 wherein said poly (1,3-butylene terephthalate) resin includes units derived from 2-methyl-1,3-propanediol.
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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) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |