US4201704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame-retarded thermoplastic polyester compositions having improved arc resistance and process for preparing same
Assignee: General Electric Co
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Filing: 1977-12-29
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Granted: 1980-05-06
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Expires: 1997-12-29
Abstract
Abstract Flame-retarded, reinforced and unreinforced thermoplastic compositions having improved arc resistance are provided comprising a high molecular weight linear polyester, such as poly(1,4-butylene terephthalate) and the like, a flame-retarding amount of a flame-retardant, such as a halogenated aromatic polycarbonate, and novaculite. A process for improving the arc resistance of reinforced or unreinforced flame-retardant polyester compositions is also provided, the process comprising admixing novaculite with a high molecular weight linear polyester and a flame retardant.
Inventors
- 👤 Stuart C. Cohen
- 👤 Niles R. Rosenquist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:48
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08K3/36; C08K5/00; C08K5/04; C08K5/10; C08K5/49; C08K9/00; C08K9/04; C08L; C08L67/00; C08L67/02; C08L69/00
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
40 words
A process for improving the electrical arc resistance of a thermoplastic composition, said process comprising admixing novaculite with a high molecular weight linear polyester resin and a flame-retarding amount of a flame-retardant, thereby increasing the arc resistance of the composition.
Claim 2
Dependent Claim
40 words
A process for improving the electrical arc resistance of a thermoplastic composition, said process comprising admixing novaculite with a high molecular weight linear polyester resin and a flame-retarding amount of a flame-retardant, thereby increasing the arc resistance of the composition.
Claim 3
Dependent Claim
19 words
A process as defined in claim 1 wherein said novaculite is treated with an organosilane or organotitanate coupling agent.
Claim 4
Dependent Claim
20 words
A process as defined in claim 1 wherein an organosilane or organotitanate coupling agent is also added to the composition.
Claim 5
Dependent Claim
17 words
A process as defined in claim 2, wherein a reinforcing agent is also included in the composition.
Claim 6
Dependent Claim
21 words
A process as defined in claim 2 wherein a normally slow burning, non-flame-retardant polycarbonate resin is also included in the composition.
Claim 7
Dependent Claim
27 words
A process as defined in claim 2 wherein the amount of novaculite employed is from about 5 to about 50 percent by weight of the total composition.
Claim 8
Dependent Claim
38 words
A process as defined in claim 2 wherein said polyester 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 9
Dependent Claim
102 words
A process as defined in claim 2 wherein said flame-retardant is selected from the group consisting of an aromatic carbonate homopolymer having repeating units of the formula: ##STR6## wherein R 1 and R 2 are hydrogen, lower alkyl or phenyl, X 1 and X 2 are bromo or chloro or mixtures thereof and m and r are from 1 to 4, an aromatic (copoly-) carbonate in which from 25 to 75 wt. percent of the repeating units comprise chloro or bromo-substituted dihydric phenol units and the remainder of the repeating units comprise dihydric phenol, glycol or dicarboxylic acid units, and mixtures thereof.
Claim 10
Dependent Claim
84 words
A process as defined in claim 5 wherein said polycarbonate consists essentially of recurring units of the formula: ##STR7## wherein each --R-- is selected from the group consisting of phenylene, halo-substituted phenylene and alkyl substituted phenylene, and X and Y are each selected from the group consisting of hydrogen, hydrocarbon radicals free from aliphatic unsaturation and of radicals which, together and with the adjoining ##STR8## atom, form a cycloalkane radical, the total number of carbon atoms in X and Y being up to 12.
Claim 11
Dependent Claim
26 words
A process as defined in claim 8 wherein said flame-retardant is an aromatic (copoly-) carbonate of a 50:50 mole ratio of bisphenol A and tetrabromobisphenol A.
Claim 12
Dependent Claim
13 words
A process as defined in claim 2 wherein said polyester is poly(1,4-butylene terephthalate).
Claim 13
Dependent Claim
15 words
A process as defined in claim 9 wherein said polycarbonate has the repeating unit. ##STR9##
Claim 14
Dependent Claim
19 words
A process as defined in claim 12 wherein the polycarbonate resin consists of from 20 to 400 repeating units.
Claim 15
Dependent Claim
14 words
A process as defined in claim 4 wherein said reinforcing agent is glass fibers.
Claim 16
Dependent Claim
50 words
A process as defined in claim 1 wherein said high molecular weight linear polyester resin is poly(1,4-butylene terephthalate), said flame-retardant is an aromatic (copoly-) carbonate of a 50:50 mole ratio of bisphenol A and tetrabromobisphenol A and wherein a reinforcing amount of glass fibers is also included in the composition.
Claim 17
Dependent Claim
19 words
A process as defined in claim 15 wherein said novaculite is treated with an organosilane or organotitanate coupling agent.
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) | 1983-05-06 | 1983-11-05 | 1984-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-06 | 1987-11-05 | 1988-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-06 | 1991-11-05 | 1992-05-06 | $7700.00 | Window Closed / Lapsed |