US3966843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonflammable polystyrene thermoplastic compositions containing a brominated ester polymer
Assignee: BASF Corp
•
Filing: 1975-05-05
•
Granted: 1976-06-29
•
Expires: 1995-05-05
Abstract
Abstract Brominated esters of copolymers of maleic anhydride and a compound containing ethylenic unsaturation, e.g., tribromoneopentyl ester of styrene-maleic anhydride, useful as flame retardants for polystyrene, are compatable with polystyrene and heat stable above temperatures used for processing polystyrene.
Inventors
- 👤 Arne O. Finberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:21
CPC Classifications
C; C08; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/06; C08L35/00; Y; Y10; Y10S; Y10S260/00; Y10S260/24
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
37 words
A nonflammable thermoplastic polystyrene composition containing an amount sufficient to impart nonflammability characteristics to said composition of a brominated alkyl or aryl ester of a copolymer of maleic acid or anhydride and a compound containing ethylenic unsaturation.
Claim 2
Dependent Claim
37 words
A nonflammable thermoplastic polystyrene composition containing an amount sufficient to impart nonflammability characteristics to said composition of a brominated alkyl or aryl ester of a copolymer of maleic acid or anhydride and a compound containing ethylenic unsaturation.
Claim 3
Dependent Claim
17 words
The composition of claim 1 wherein the brominated ester is a C 6 -C 18 aryl ester.
Claim 4
Dependent Claim
17 words
The composition of claim 1 wherein the brominated ester is a C 1 -C 10 alkyl ester.
Claim 5
Dependent Claim
27 words
The composition of claim 3 wherein the nonflammable thermoplastic composition comprises polystyrene and a brominated C 1 -C 10 alkyl ester of a copolymer of styrenemaleic anhydride.
Claim 6
Dependent Claim
24 words
The composition of claim 4 containing about 20 wt. % based on the total weight of the composition, of brominated ester as described therein.
Claim 7
Dependent Claim
29 words
The composition of claim 4 wherein the ester is tribromoneopentyl ester of styrene-maleic anhydride copolymer having a bromine content of from about 0.5-60 wt. % based on the ester.
Claim 8
Dependent Claim
14 words
The composition of claim 4 wherein the ester is 2,3-tribromoneopentyl ester of α-methyl-styrene-maleic anhydride.
Claim 9
Dependent Claim
14 words
The composition of claim 6 wherein said bromine content is about 19 wt. %.
Claim 10
Dependent Claim
14 words
The composition of claim 6 wherein said bromine content is about 45 wt. %.
Claim 11
Dependent Claim
10 words
The composition of claim 1 comprising a polystyrene molding composition.
Claim 12
Dependent Claim
58 words
A process for forming a nonflammable thermoplastic polystyrene composition according to claim 1 comprising intimately admixing a melt blend of said polystyrene with from about 1- 30 wt. %, based on the total weight of the composition, of a brominated alkyl or aryl ester of a copolymer of maleic acid or anhydride and a compound containing ethylenic unsaturation.
Claim 13
Dependent Claim
48 words
A process for forming a nonflammable thermoplastic composition according to claim 4 comprising intimately admixing a melt blend of polystyrene with from about 1- 30 wt. %, based on the total weight of the composition, of a brominated C 1 -C 10 alkyl ester of styrene-maleic anhydride copolymer.
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) | 1979-06-29 | 1979-12-29 | 1980-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-29 | 1983-12-29 | 1984-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-29 | 1987-12-29 | 1988-06-29 | $7700.00 | Window Closed / Lapsed |