Patent US4140669A successfully refreshed from Google Patents.
US4140669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Warp-resistant reinforced thermoplastic compositions comprising polyester resins, talc and silica
Assignee: General Electric Co
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Filing: 1977-12-30
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Granted: 1979-02-20
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Expires: 1997-12-30
Abstract
Abstract Reinforced thermoplastic compositions are provided comprising a poly(1,4-butylene terephthalate) resin, a poly(ethylene terephthalate) resin, and a reinforcing, warp resisting combination of talc and silica. The compositions optionally include a segmented copolyester resin, a silicon polymer and/or a fibrous glass reinforcement. The compositions are moldable to articles having improved resistance to warpage during heat treatment in comparison with molding compositions of talc, (poly(1,4-butylene terephthalate) and poly(ethylene terephthalate).
Inventors
- 👤 Donald L. Phipps, Jr.
- 👤 Allen D. Wambach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:43
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08K3/36; C08K3/40; C08L; C08L67/00; C08L67/02; C08L83/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
46 words
A thermoplastic molding composition which, after molding, has increased resistance to warpage, the composition comprising, in intimate admixture: (a) a poly(1,4-butylene terephthalate) resin; (b) a poly(ethylene terephthalate) resin; and (c) a reinforcing and warp resistance improving amount of a combination of (i) talc and (ii) silica.
Claim 2
Dependent Claim
46 words
A thermoplastic molding composition which, after molding, has increased resistance to warpage, the composition comprising, in intimate admixture: (a) a poly(1,4-butylene terephthalate) resin; (b) a poly(ethylene terephthalate) resin; and (c) a reinforcing and warp resistance improving amount of a combination of (i) talc and (ii) silica.
Claim 3
Dependent Claim
42 words
A composition as defined in claim 1 wherein component (a) comprises from 1 to 99 parts by weight and component (b) comprises from 99 to 1 parts by weight per 100 parts by weight of the total resinous components in the composition.
Claim 4
Dependent Claim
36 words
A composition as defined in claim 1 wherein component (c) is present in an amount of at least about 5 parts by weight per 100 parts by weight of the combined components (a), (b) and (c).
Claim 5
Dependent Claim
38 words
A composition as defined in claim 3 wherein component (c) is present in an amount of from about 5 to about 60 parts by weight per 100 parts by weight of the combined components (a), (b) and (c).
Claim 6
Dependent Claim
39 words
A composition as defined in claim 1 wherein component (c) (i) comprises from 1 to 99 parts by weight and component (c) (ii) comprises from 99 to 1 parts by weight per 100 parts by weight of component (c).
Claim 7
Dependent Claim
37 words
A composition as defined in claim 1 wherein component (c) (i) comprises from 5 to 25 and component (c) (ii) comprises from 75 to 25 parts by weight based on 100 parts by weight of component (c).
Claim 8
Dependent Claim
14 words
A composition as defined in claim 1 which also includes a segmented copolyester resin.
Claim 9
Dependent Claim
12 words
A composition as defined in claim 1 which also includes a polydiorganosiloxane.
Claim 10
Dependent Claim
34 words
A composition as defined in claim 1 which also includes a small amount of up to about 30 parts by weight of reinforcing fibrous glass per 100 parts by weight of the total composition.
Claim 11
Dependent Claim
41 words
A composition as defined in claim 1 wherein each resin component (a) and (b) has an intrinsic viscosity of at least about 0.4 deciliter per gram when measured in a solution in 60:40 mixture of phenol and tetrachloroethane at 30° C.
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) | 1982-02-19 | 1982-08-21 | 1983-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-19 | 1986-08-21 | 1987-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-19 | 1990-08-21 | 1991-02-20 | $7700.00 | Window Closed / Lapsed |