US4290937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic molding compositions
Assignee: General Electric Co
•
Filing: 1979-05-29
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Granted: 1981-09-22
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Expires: 1999-05-29
Abstract
Abstract A thermoplastic molding composition having improved mold release properties is provided, the composition comprising a thermoplastic resin selected from the group consisting of a high molecular weight linear polyester and a high molecular weight block copolyester, from about 0.1 to 4.5% by weight, based on the total composition, of a polyolefin or olefin-based copolymer, and, optionally, from about 0.02 to 0.5% by weight, based on the total composition, of talc.
Inventors
- 👤 Stuart C. Cohen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:32
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08L; C08L23/00; C08L67/00; C08L67/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
66 words
An improved molding composition having improved mold releasability, said composition consisting essentially of: (a) poly(1,4-butylene terephthalate); (b) from about 0.25 to 4.5 percent by weight, based on the total composition, of polyethylene or an olefin-based copolymer selected from propylene-ethylene copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer or mixtures thereof; and (c) from about 0.02 to about 0.5% by weight, based on the total composition, of talc.
Claim 2
Dependent Claim
66 words
An improved molding composition having improved mold releasability, said composition consisting essentially of: (a) poly(1,4-butylene terephthalate); (b) from about 0.25 to 4.5 percent by weight, based on the total composition, of polyethylene or an olefin-based copolymer selected from propylene-ethylene copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer or mixtures thereof; and (c) from about 0.02 to about 0.5% by weight, based on the total composition, of talc.
Claim 3
Dependent Claim
13 words
A composition as defined in claim 1 wherein said component (b) is polyethylene.
Claim 4
Dependent Claim
39 words
A composition as defined in claim 1 wherein said poly(1,4-butylene terephthalate) has an intrinsic viscosity of at least about 0.4 deciliters per gram when measured in a solution in a 60:40 mixture of phenol and trichloroethane at 30° C.
Claim 5
Dependent Claim
67 words
An improved thermoplastic molding composition having improved mold releasability, said composition consisting essentially of: (a) poly(1,4-butylene terephthalate), (b) from about 0.1 to 4.5 percent by weight, based on the total composition, of polyethylene or an olefin-based copolymer selected from propylene-ethylene copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer or mixtures thereof; and (c) from about 0.02 to about 0.5% by weight, based on the total composition, of talc.
Claim 6
Dependent Claim
67 words
An improved thermoplastic molding composition having improved mold releasability, said composition consisting essentially of: (a) poly(1,4-butylene terephthalate), (b) from about 0.1 to 4.5 percent by weight, based on the total composition, of polyethylene or an olefin-based copolymer selected from propylene-ethylene copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer or mixtures thereof; and (c) from about 0.02 to about 0.5% by weight, based on the total composition, of talc.
Claim 7
Dependent Claim
13 words
A composition as defined in claim 4 wherein said component (b) is polyethylene.
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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) | 1984-09-21 | 1985-03-23 | 1985-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-21 | 1989-03-23 | 1989-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-21 | 1993-03-23 | 1993-09-22 | $7700.00 | Window Closed / Lapsed |