US4421888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sustained high arc resistant polyester composition
Assignee: Celanese Corp
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Filing: 1982-03-30
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Granted: 1983-12-20
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Expires: 2002-03-30
Abstract
Abstract In an article molded from a non-burning, non-dripping filled polyester composition having a high level of arc resistance and tracking resistance, decay in the arc resistance with time is substantially decreased or prevented by incorporating a minor but critical amount of polyethylene terephthalate. Typical compositions comprise (a) approximately 30 to 60 percent by weight, based on the composition, of a mixture of polyethylene terephthalate and polybutylene terephthalate wherein polyethylene terephthalate comprises approximately 3 to 20 percent by weight; (b) approximately 30 to 60 percent by weight of the composition of a mixture of fiber glass and talc wherein talc comprises approximately 15 to 35 percent by weight of the composition; and (c) an effective amount, up to 20 percent by weight of the composition of a flame retardant additive or a mixture thereof. Typical compositions possess superior electrical properties, comparable to those of thermosetting molding resins.
Inventors
- 👤 Tsuneyoshi Okada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:05
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/42; H01B3/421; H01B3/422; C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/34; C08K3/36; C08K3/40; C08K5/00; C08K5/04; C08K5/06; C08K7/00; C08K7/02; C08K7/04; C08K7/14; C08L; C08L27/00; C08L27/02; C08L27/12; C08L27/18; C08L67/00; C08L67/02
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
111 words
A non-burning, non-dripping polyester molding composition with a sustained high level of arc resistance and tracking resistance, comprising: (A) approximately 30 to 60 percent by weight of the composition a mixture of polybutylene terephthalate and polyethylene terephthalate wherein polyethylene terephthalate comprises approximately 3 to 20 percent by weight of the composition; (B) approximately 30 to 60 percent by weight of the composition of a mixture of talc and fiber glass wherein said talc comprises about 15 to 35 percent by weight of the composition; and (C) an effective amount, up to 20 percent by weight of the composition of a flame retardant or flame retardant mixture to render the composition non-burning.
Claim 2
Dependent Claim
111 words
A non-burning, non-dripping polyester molding composition with a sustained high level of arc resistance and tracking resistance, comprising: (A) approximately 30 to 60 percent by weight of the composition a mixture of polybutylene terephthalate and polyethylene terephthalate wherein polyethylene terephthalate comprises approximately 3 to 20 percent by weight of the composition; (B) approximately 30 to 60 percent by weight of the composition of a mixture of talc and fiber glass wherein said talc comprises about 15 to 35 percent by weight of the composition; and (C) an effective amount, up to 20 percent by weight of the composition of a flame retardant or flame retardant mixture to render the composition non-burning.
Claim 3
Dependent Claim
24 words
A non-burning, non-dripping polyester molding composition according to claim 1, wherein polyethylene terephthalate comprises approximately 5 to 15 percent by weight of the composition.
Claim 4
Dependent Claim
21 words
A non-burning, non-dripping polyester composition according to claim 1, wherein polyethylene terephthalate comprises approximately 10 percent by weight of the composition.
Claim 5
Dependent Claim
25 words
A non-burning, non-dripping polyester molding composition according to claim 1, 2 or 3 wherein talc comprises 25 to 35 percent by weight of the composition.
Claim 6
Dependent Claim
21 words
A non-burning, non-dripping polyester molding composition according to claim 4, wherein the flame retardant mixture comprises decabromodiphenylether, antimony trioxide and polytetrafluoroethylene.
Claim 7
Dependent Claim
37 words
A non-burning, non-dripping polyester molding composition according to claim 5, wherein the flame retardant mixture comprises about 5% by weight of decarbromodiphenylether, about 5% by weight of Oncor 55 and 0.5 to 2.5 percent by weight polytetrafluoroethylene.
Claim 8
Dependent Claim
16 words
A non-burning, non-dripping polyester molding composition according to claim 6 further comprising a mold release agent.
Claim 9
Dependent Claim
161 words
A non-burning, non-dripping polyester composition characterized by having at least 150 sec. arc resistance and at least 400 volts comparative tracking index, wherein the arc resistance will not substantially decay upon storage at ambient conditions comprising approximately 2 to 20 percent by weight of the composition of decabromodiphenylether, (A) approximately 35 to 50 percent by weight of the composition of a blend of polybutylene terephthalate and polyethylene terephthalate wherein polyethylene terephthalate comprises approximately 5 to 15 percent by weight of the composition; (B) approximately 40 to 60 percent by weight of the composition a mixture of talc and fiber glass, wherein talc comprises approximately 25 to 35 percent by weight of the composition; (C) a flame retardant mixture comprising approximately 2 to 10 percent by weight of the composition of Oncor 55 and approximately 0.2 to 2.5 percent by weight of the composition of Teflon, and approximately 0.1 to 1 percent by weight of the composition of a mold release agent.
Claim 10
Dependent Claim
161 words
A non-burning, non-dripping polyester composition characterized by having at least 150 sec. arc resistance and at least 400 volts comparative tracking index, wherein the arc resistance will not substantially decay upon storage at ambient conditions comprising approximately 2 to 20 percent by weight of the composition of decabromodiphenylether, (A) approximately 35 to 50 percent by weight of the composition of a blend of polybutylene terephthalate and polyethylene terephthalate wherein polyethylene terephthalate comprises approximately 5 to 15 percent by weight of the composition; (B) approximately 40 to 60 percent by weight of the composition a mixture of talc and fiber glass, wherein talc comprises approximately 25 to 35 percent by weight of the composition; (C) a flame retardant mixture comprising approximately 2 to 10 percent by weight of the composition of Oncor 55 and approximately 0.2 to 2.5 percent by weight of the composition of Teflon, and approximately 0.1 to 1 percent by weight of the composition of a mold release agent.
Claim 11
Dependent Claim
33 words
A non-burning, non-dripping polyester composition according to claim 8, wherein polyethylene terephthalate comprises approximately 10 percent by weight of the composition, and wherein talc comprises approximately 30 percent by weight of the composition.
Claim 12
Independent Claim
111 words
A method to decrease the decay of arc resistance with time by the incorporation of approximately 3 to 20 percent by weight of the composition of polyethylene terephthalate into a non-burning, non-dripping polybutylene terephthalate molding composition comprising: (A) approximately 20 to 55 percent by weight of the composition of polybutylene terephthalate; (B) approximately 30 to 60 percent by weight of the composition of a mixture of talc and fiber glass wherein talc comprises approximately 15 to 35 percent by weight of the composition; and (C) an effective amount, up to approximately 20 percent by weight of the composition of a flame retardant or flame retardant mixture to render the composition non-burning.
Claim 13
Independent Claim
111 words
A method to decrease the decay of arc resistance with time by the incorporation of approximately 3 to 20 percent by weight of the composition of polyethylene terephthalate into a non-burning, non-dripping polybutylene terephthalate molding composition comprising: (A) approximately 20 to 55 percent by weight of the composition of polybutylene terephthalate; (B) approximately 30 to 60 percent by weight of the composition of a mixture of talc and fiber glass wherein talc comprises approximately 15 to 35 percent by weight of the composition; and (C) an effective amount, up to approximately 20 percent by weight of the composition of a flame retardant or flame retardant mixture to render the composition non-burning.
Claim 14
Dependent Claim
32 words
A method to decrease the decay of arc resistance with time according to claim 10 wherein approximately 5 to 15 percent by weight, based on the composition, of polyethylene terephthalate is incorporated.
Claim 15
Dependent Claim
30 words
A method to decrease the decay of arc resistance with time according to claim 10 wherein approximately 10 percent by weight, based on the composition, of polyethylene terephthalate is incorporated.
Claim 16
Dependent Claim
25 words
A method to decrease the decay of arc resistance with time according to claim 10 wherein talc is approximately 25 to 35 percent by weight.
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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) | 1986-12-19 | 1987-06-20 | 1987-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-19 | 1991-06-20 | 1991-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-19 | 1995-06-20 | 1995-12-20 | $7700.00 | Window Closed / Lapsed |