US4397972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame retardant polystyrene and poly(para-methylstyrene) compositions containing octahalobiphthalyl
Assignee: Mobil Oil AS
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Filing: 1982-12-30
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Granted: 1983-08-09
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Expires: 2002-12-30
Abstract
Abstract Flame retarded compositions of styrene or para-methylstyrene polymers and containing octahalobiphthalyl, such as octabromobiphthalyl, and inorganic flame retardant, such as antimony trioxide.
Inventors
- 👤 Bruce A. Marien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:06
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/15; C08K5/151; C08K5/1535
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
51 words
A flame-retarded composition comprising: a. a polymer or copolymer containing at least 50 weight percent of polymerized styrene; or methylstyrene isomers consisting essentially of 0-0.1 percent by weight ortho-methylstyrene, 0-15 percent by weight meta-methylstyrene, and at least 85 percent by weight para-methylstyrene; b. an inorganic flame retardant; and c. octahalogenated biphthalyl.
Claim 2
Dependent Claim
51 words
A flame-retarded composition comprising: a. a polymer or copolymer containing at least 50 weight percent of polymerized styrene; or methylstyrene isomers consisting essentially of 0-0.1 percent by weight ortho-methylstyrene, 0-15 percent by weight meta-methylstyrene, and at least 85 percent by weight para-methylstyrene; b. an inorganic flame retardant; and c. octahalogenated biphthalyl.
Claim 3
Dependent Claim
21 words
The composition of claim 1 wherein sufficient amounts of flame-retardants are added to achieve a V-0 flame-retardancy under UL-94 flammability test.
Claim 4
Dependent Claim
30 words
The composition of claim 1 wherein the mixture of isomers of methylstrene consists essentially of at least 90% by weight para-methylstyrene, 0-10% by weight meta-methylstyrene, and 0-0.1% by weight ortho-methylstyrene.
Claim 5
Dependent Claim
30 words
The composition of claim 1 wherein the mixture of isomers of methylstyrene consists essentially of at least 95% by weight para-methylstyrene, 0-5% by weight meta-methylstyrene, and 0-0.5% by weight ortho-methylstyrene.
Claim 6
Dependent Claim
50 words
The composition of claim 1 wherein (a) is a high impact graft copolymer comprising a backbone polymer chain which is selected from the group consisting of polybutadiene, a styrene-butadiene rubber, an ethylene-propylene rubber, an ethylene-propylene-diene elastomer; and graft polymeric units derived from said polymerizable mixture of methylstyrene isomers grafted thereto.
Claim 7
Dependent Claim
47 words
The composition of claim 1 wherein (a) is a high impact graft copolymer of styrene comprising a backbone polymer chain which is selected from the group consisting of polybutadiene, a styrene-butadiene rubber, an ethylene-propylene rubber, an ethylene-propylene-diene elastomer; and graft polymeric units derived from styrene grafted thereto.
Claim 8
Dependent Claim
11 words
The composition of claim 1 in which (a) is crystal polystyrene.
Claim 9
Dependent Claim
11 words
The composition of claim 1 in which (a) is crystal poly(para-methylstyrene).
Claim 10
Dependent Claim
14 words
The composition of claim 1 in which said inorganic flame retardant is antimony trioxide.
Claim 11
Dependent Claim
12 words
The composition of claim 1 in which said octahalogenated biphthalyl is octabromobiphthalyl.
Claim 12
Dependent Claim
49 words
The composition of claim 1 in which said inorganic flame retardant is antimony trioxide which is present in an amount of 3 to 8 weight percent of the homo-polymer or copolymer and said octahalogenated biphthalyl is octabromobiphthalyl which is present in an amount of 10 to 20 weight percent.
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) | 1986-08-08 | 1987-02-07 | 1987-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-08 | 1991-02-07 | 1991-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-08 | 1995-02-07 | 1995-08-09 | $7700.00 | Window Closed / Lapsed |