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US4155898A
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Flame retardant blend comprising a polyalkylene terephthalate, an organo polysiloxane-polycarbonate block copolymer, and a halogenated copolycarbonate
Assignee: General Electric Co
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Filing: 1978-01-13
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Granted: 1979-05-22
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Expires: 1998-01-13
Abstract
Abstract A polymer blend comprising a polyalkylene terephthalate, an organopolysiloxane-polycarbonate block copolymer, and a halogenated copolycarbonate having improved impact, heat distortion and flame retardant properties. The polymer blends can be molded or formed into films, sheets, fibers, laminates, or other improved molded articles of manufacture, including reinforced articles by conventional techniques.
Inventors
- 👤 Richard C. Bopp
- 👤 Samuel Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:11
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
18 words
An improved flame retardant blend comprising a polyalkylene terephthalate resin, an organopolysiloxane-polycarbonate block copolymer and a halogenated copolycarbonate.
Claim 2
Dependent Claim
18 words
An improved flame retardant blend comprising a polyalkylene terephthalate resin, an organopolysiloxane-polycarbonate block copolymer and a halogenated copolycarbonate.
Claim 3
Dependent Claim
32 words
The claim 1 blend, wherein on a weight basis, the ratio of said copolycarbonate to the polyalkylene terephthalate resin and organopolysiloxane-polycarbonate block copolymer components of the blend is from 99:1 to 1:99.
Claim 4
Dependent Claim
12 words
The claim 2 blend, wherein said ratio is from 1:99 to 50:50.
Claim 5
Dependent Claim
13 words
The claim 3 blend, further comprising a reinforcing amount of a reinforcing filler.
Claim 6
Dependent Claim
12 words
The claim 4 blend, wherein said filler is a fibrous glass filament.
Claim 7
Dependent Claim
33 words
The claim 1 blend, wherein said resin is of the formula: ##STR8## n being a number of from 1 to 50, said resin having an intrinsic viscosity of at least about 0.2 dl./g.
Claim 8
Dependent Claim
129 words
The claim 1 blend wherein said copolymer is of the formula: ##STR9## where X is an integer equal to 1 to 1000, inclusive, preferably 2 to 100, n is a number average equal to 1 to 100, inclusive, preferably 5 to 40, a is a number average equal to 1.1 to 100, m is equal to 1, and Z is an integer equal to 1 to 1000, inclusive, preferably 5 to 12, E is a member selected from the class of hydrogen, lower alkyl radicals and halogen radicals and mixtures thereof, R is a member selected from the class of hydrogen, monovalent hydrocarbon radicals and halogenated monovalent hydrocarbon radicals, and R' is a member selected from the class of monovalent hydrocarbon radicals, halogenated monovalent hydrocarbon radicals and cyanoalkyl radicals.
Claim 9
Dependent Claim
39 words
The claim 1 blend wherein said flame retardant additive is of the formula: ##STR10## wherein x, the average number of repeating units is from about 3 to about 7, and the softening temperature is from 200° to 260° C.
Claim 10
Dependent Claim
26 words
The claim 7 blend wherein X equal ˜7; Y equals ˜8 to 10; Z equals ˜1; a equals ˜2; n equals ˜10; and m equals ˜1.
Claim 11
Dependent Claim
26 words
The claim 7 blend wherein X equals ˜10; Y equals ˜8 to 10; Z equals ˜1; a equals ˜2; n equals ˜20; and m equals ˜1.
References Cited (Backward Citations)
US3686355A
Cited
US3855277A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-05-21 | 1982-11-20 | 1983-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-21 | 1986-11-20 | 1987-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-21 | 1990-11-20 | 1991-05-22 | $7700.00 | Window Closed / Lapsed |