US4661574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame retardant molded composition which incorporates a poly[N-(bromophenyl)maleimide-co-styrene-co-N-phenylmalemide] copolymer
Assignee: Lyondell Chemical Technology LP
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Filing: 1986-04-11
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Granted: 1987-04-28
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Expires: 2006-04-11
Abstract
Abstract A moldable composition which comprises a novel random N-(halogenated phenyl)maleimide-containing copolymer and a flame-retardant synergist is disclosed. The molded composition exhibits at least a 94V-1 classification when tested in accordance with Underwriters' Laboratories Inc. Test Method UL94.
Inventors
- 👤 Usama E. Younes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:23
CPC Classifications
C; C08; C08F; C08F222/00; C08F222/36; C08F222/40; C08L; C08L35/00; C08L35/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
114 words
A random copolymer comprised of the following recurring units. ##STR7## wherein R represents --H, --CH 3 , or --CH 2 CH 3 ; each R 1 separately represents --CH 3 , --CH 2 CH 3 , --CH(CH 3 ) 2 , --C(CH 3 ) 3 , --OH, --NH 2 , --OCH 3 , --CO 2 H, --CONH 2 , or --CON(CH 3 ) 2 ; each R 2 separately represents --H or --CH 3 ; R 3 represents a C 1 to C 4 alkyl group or ##STR8## R 4 represents --Cl or --Br; x represents an integer of from 0 to 3 and wherein y represents an integer of from 1 to 3.
Claim 2
Dependent Claim
114 words
A random copolymer comprised of the following recurring units. ##STR7## wherein R represents --H, --CH 3 , or --CH 2 CH 3 ; each R 1 separately represents --CH 3 , --CH 2 CH 3 , --CH(CH 3 ) 2 , --C(CH 3 ) 3 , --OH, --NH 2 , --OCH 3 , --CO 2 H, --CONH 2 , or --CON(CH 3 ) 2 ; each R 2 separately represents --H or --CH 3 ; R 3 represents a C 1 to C 4 alkyl group or ##STR8## R 4 represents --Cl or --Br; x represents an integer of from 0 to 3 and wherein y represents an integer of from 1 to 3.
Claim 3
Dependent Claim
13 words
The random copolymer of claim 1 in which R 3 represents a hydrogen.
Claim 4
Dependent Claim
9 words
The random copolymer of claim 1 being poly[styrene-co-N-phenylmaleimide-co-N-(brominated phenyl)maleimide].
Claim 5
Dependent Claim
20 words
The random copolymer of claim 1 containing from about 2 to about 6 total weight percent of chlorine and/or bromine.
Claim 6
Dependent Claim
20 words
The random copolymer of claim 1 containing from about 3 to about 12 total weight percent of chlorine and/or bromine.
References Cited (Backward Citations)
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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) | 1990-04-27 | 1990-10-27 | 1991-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-27 | 1994-10-27 | 1995-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-27 | 1998-10-27 | 1999-04-28 | $7700.00 | Window Closed / Lapsed |