US4122061A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impact modified polyester compositions
Assignee: General Electric Co
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Filing: 1976-12-23
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Granted: 1978-10-24
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Expires: 1996-12-23
Abstract
Abstract Reinforced, impact modified thermoplastic polyester compositions are provided which comprise a poly(1,4-butylene terephthalate) resin, a poly(ethylene terephthalate) resin, a fibrous glass reinforcement alone or in combination with a mineral reinforcing filler and, as an impact modifier therefor, a polyolefin or olefin based copolymer resin. The polyolefinic impact modifier is easily dispersed in the compositions and provides significantly improved impact strength in surprisingly small amounts, in comparison with corresponding compositions which are unmodified.
Inventors
- 👤 Frederick Frank Holub
- 👤 Phillip Steven Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:48
CPC Classifications
C; C08; C08K; C08K7/00; C08K7/02; C08K7/04; C08K7/14; C08K3/00; C08L; C08L23/00; C08L31/00; C08L67/00; C08L67/02
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
105 words
A thermoplastic composition having improved impact strength after molding, said composition comprising: (a) a thermoplastic polyester composition comprising, in intimate admixture, a poly(1,4-butylene terephthalate) resin, a poly(ethylene terephthalate) resin and a reinforcing amount of a reinforcing agent therefor comprising fibrous glass alone or in combination with a mineral reinforcing filler, and (b) a minor amount of up to 5% by weight of (a) and (b) an impact modifier therefor comprising a polyolefin or olefin based copolymer resin, said resin being present in an amount at least sufficient to provide improved impact strength in comparison with a corresponding composition which does not contain said polyolefinic resin.
Claim 2
Dependent Claim
105 words
A thermoplastic composition having improved impact strength after molding, said composition comprising: (a) a thermoplastic polyester composition comprising, in intimate admixture, a poly(1,4-butylene terephthalate) resin, a poly(ethylene terephthalate) resin and a reinforcing amount of a reinforcing agent therefor comprising fibrous glass alone or in combination with a mineral reinforcing filler, and (b) a minor amount of up to 5% by weight of (a) and (b) an impact modifier therefor comprising a polyolefin or olefin based copolymer resin, said resin being present in an amount at least sufficient to provide improved impact strength in comparison with a corresponding composition which does not contain said polyolefinic resin.
Claim 3
Dependent Claim
35 words
A composition as defined in claim 1 wherein said polyolefin or olefin based copolymer is selected from (i) polyethylene; (ii) propylene-ethylene copolymer; (iii) ethylene-vinyl acetate copolymer; or (iv) a mixture of any of the foregoing.
Claim 4
Dependent Claim
31 words
A composition as defined in claim 1 wherein the polyolefin or olefin based copolymer resin is present in an amount of at least about 1.0% by weight of (a) and (b).
Claim 5
Dependent Claim
33 words
A composition as defined in claim 1 wherein the polyolefin or olefin based copolymer resin is present in an amount of from about 1 to about 5% by weight of (a) and (b).
Claim 6
Dependent Claim
36 words
A composition as defined in claim 1 wherein the reinforcing agent comprises from about 1 to about 60% by weight of fibrous glass and from 0 to about 60% by weight of a mineral reinforcing filler.
Claim 7
Dependent Claim
37 words
A composition as defined in claim 1 wherein said polyester resins have an intrinsic viscosity of at least about 0.4 deciliters/gram when measured in a solution in a 60:40 mixture of phenol and trichloroethane at 30° C.
Claim 8
Dependent Claim
38 words
A composition as defined in claim 6 wherein said polyesters have 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 trichloroethane at 30° C.
Claim 9
Dependent Claim
16 words
A composition as defined in claim 1 wherein said poly(1,4-butylene terephthalate) resin is linear or branched.
Claim 10
Dependent Claim
34 words
A composition as defined in claim 8 wherein said branched polyester is a high melt viscosity (1,4-butylene terephthalate) resin which includes a small amount of branching component containing at least three ester forming groups.
Claim 11
Dependent Claim
14 words
A composition as defined in claim 1 wherein said mineral reinforcing filler is talc.
Claim 12
Dependent Claim
14 words
A composition as defined in claim 1 wherein said mineral reinforcing filler is α-quartz.
Claim 13
Dependent Claim
66 words
A thermoplastic composition having improved impact strength after molding, said composition comprising: (a) a thermoplastic polyester composition comprising, in intimate admixture, a poly(1,4-butylene terephthalate) resin, a poly(ethylene terephthalate) resin and a reinforcing agent therefor comprising fibrous glass in combination with talc, and (b) from about 1.0 to about 5% by weight of (a) and (b) of (i) polyethylene; (ii) propylene-ethylene copolymer; or (iii) ethylene-vinyl acetate copolymer.
Claim 14
Dependent Claim
66 words
A thermoplastic composition having improved impact strength after molding, said composition comprising: (a) a thermoplastic polyester composition comprising, in intimate admixture, a poly(1,4-butylene terephthalate) resin, a poly(ethylene terephthalate) resin and a reinforcing agent therefor comprising fibrous glass in combination with talc, and (b) from about 1.0 to about 5% by weight of (a) and (b) of (i) polyethylene; (ii) propylene-ethylene copolymer; or (iii) ethylene-vinyl acetate copolymer.
Claim 15
Dependent Claim
61 words
A thermoplastic composition having improved impact strength after molding, said composition comprising: (a) a thermoplastic polyester composition comprising, in intimate admixture, a poly(1,4-butylene terephthalate) resin, a poly(ethylene terephthalate) resin and a reinforcing agent therefor comprising fibrous glass in combination with α-quartz, and (b) from about 1.0 to about 5% by weight of (a) and (b) of (i) polyethylene; or ethylene-propylene copolymer.
Claim 16
Dependent Claim
61 words
A thermoplastic composition having improved impact strength after molding, said composition comprising: (a) a thermoplastic polyester composition comprising, in intimate admixture, a poly(1,4-butylene terephthalate) resin, a poly(ethylene terephthalate) resin and a reinforcing agent therefor comprising fibrous glass in combination with α-quartz, and (b) from about 1.0 to about 5% by weight of (a) and (b) of (i) polyethylene; or ethylene-propylene copolymer.
References Cited (Backward Citations)
US3953394A
Cited
US3953394B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-23 | 1982-04-24 | 1982-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-23 | 1986-04-24 | 1986-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-23 | 1990-04-24 | 1990-10-24 | $7700.00 | Window Closed / Lapsed |