US4399244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass fiber reinforced polyethylene terephthalate compositions having improved heat distortion temperatures
Assignee: Bayer AG
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Filing: 1979-11-19
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Granted: 1983-08-16
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Expires: 1999-11-19
Abstract
Abstract This disclosure is concerned with glass reinforced polyethylene terephthalate compositions which have improved heat distortion temperatures when molded into cold molds due to the incorporation of an organic imide containing compound having a melting point in excess of 240° C. These compositions have enhanced crystallization velocities which allows them to be molded into colder molds with faster cycle times than is conventional for polyethylene terephthalate compositions and still obtain crystalline parts with optimum properties including heat distortion temperatures. Mold temperatures of less than 120° C. may be utilized without impairment of these properties.
Inventors
- 👤 Peter Bier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:18
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
79 words
A thermoplastic composition comprising: (a) from 20 to 92% by weight of a polyethylene terephthalate having an intrinsic viscosity of at least 0.3 dl/g measured as a 0.5% by weight solution in a 1:1 mixture of phenol and tetrachloroethane at 25° C., (b) from 5 to 60% by weight of glass fibers, and (c) from 3 to 20% by weight of an organic compound containing at least one imide group and having a melting point greater than 240° C.
Claim 2
Dependent Claim
79 words
A thermoplastic composition comprising: (a) from 20 to 92% by weight of a polyethylene terephthalate having an intrinsic viscosity of at least 0.3 dl/g measured as a 0.5% by weight solution in a 1:1 mixture of phenol and tetrachloroethane at 25° C., (b) from 5 to 60% by weight of glass fibers, and (c) from 3 to 20% by weight of an organic compound containing at least one imide group and having a melting point greater than 240° C.
Claim 3
Dependent Claim
15 words
The composition of claim 1, wherein the organic imide containing compound is an N,N'-alkylene bis-(tetrahalophthalimide).
Claim 4
Dependent Claim
45 words
The composition of claim 2, wherein (a) the polyethylene terephthalate has an intrinsic viscosity of at least 0.5 dl/g, (b) the glass fibers are present in 20 to 40% by weight, and (c) the imide containing compound is present in 5 to 15% by weight.
Claim 5
Dependent Claim
80 words
A thermoplastic molding composition comprising: (a) from about 20 to 92% by weight of polyethylene terephthalate having an intrinsic viscosity of at least 0.3 dl/g measured as a 0.5% by weight solution in a 1:1 mixture of phenol and tetrachloroethane at 25° C., (b) from 5 to 60% by weight of glass fibers, and (c) from 3 to 20% by weight of an organic compound containing at least one phthalimide group and having a melting point greater than 240° C.
Claim 6
Dependent Claim
80 words
A thermoplastic molding composition comprising: (a) from about 20 to 92% by weight of polyethylene terephthalate having an intrinsic viscosity of at least 0.3 dl/g measured as a 0.5% by weight solution in a 1:1 mixture of phenol and tetrachloroethane at 25° C., (b) from 5 to 60% by weight of glass fibers, and (c) from 3 to 20% by weight of an organic compound containing at least one phthalimide group and having a melting point greater than 240° C.
Claim 7
Dependent Claim
40 words
The composition of claim 4, wherein (a) polyethylene terephthalate, has an intrinsic viscosity of at least 0.5 dl/g, (b) glass fibers are present at 20-40% by weight, and (c) the phthalimide-containing compound is present in 5 to 15% by weight.
Claim 8
Dependent Claim
13 words
The composition of claim 1, wherein the phthalimide-containing compound is an N,N'-alkylene bis-(tetrahalophthalimide).
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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) | 1986-08-15 | 1987-02-14 | 1987-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-15 | 1991-02-14 | 1991-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-15 | 1995-02-14 | 1995-08-16 | $7700.00 | Window Closed / Lapsed |