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US4626573A
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Flame-retardant molded composition incorporating a poly(N-(bromophenyl)maleimide-co-styrene-co-maleic anhydride) copolymer
Assignee: Lyondell Chemical Technology LP
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Filing: 1986-04-09
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Granted: 1986-12-02
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Expires: 2006-04-09
Abstract
Abstract A moldable composition which comprises a novel random N-(brominated or chlorinated phenyl) maleimide-containing copolymer, a thermoplastic resin, preferably, polycarbonate and a flame retardant synergist is disclosed. The molded composition exhibits at least a 94 V-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 06:31
CPC Classifications
C; C08; C08L; C08L35/00; C08L35/06; C08F; C08F222/00; C08F222/04; C08F222/06; C08L69/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
135 words
A method for producing a molded article which comprises (1) blending a random copolymer comprised of the following recurring units: ##STR5## wherein R represents --H, --CH 3 , or --CH 2 CH 3 ; R 1 represents --CH 3 , --CH 2 CH 3 , --CH(CH 3 ) 2 , --C(CH 3 ) 3 , --OH, --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 --Cl or --Br; x represents an integer from 0 to 3 and wherein y represents an integer of from 1 to 3; a flame-retardant synergist and a thermoplastic resin with the proviso that the random copolymer and the thermoplastic resin cannot be the same; and, (2) molding the resulting blend.
Claim 2
Independent Claim
135 words
A method for producing a molded article which comprises (1) blending a random copolymer comprised of the following recurring units: ##STR5## wherein R represents --H, --CH 3 , or --CH 2 CH 3 ; R 1 represents --CH 3 , --CH 2 CH 3 , --CH(CH 3 ) 2 , --C(CH 3 ) 3 , --OH, --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 --Cl or --Br; x represents an integer from 0 to 3 and wherein y represents an integer of from 1 to 3; a flame-retardant synergist and a thermoplastic resin with the proviso that the random copolymer and the thermoplastic resin cannot be the same; and, (2) molding the resulting blend.
Claim 3
Dependent Claim
52 words
The method of claim 1 in which said thermoplastic resin is a polycarbonate based on bisphenol having the general formula: ##STR6## wherein each R 4 separately represents --H, a C 1 to C 4 alkyl group, Cl, or Br and wherein X represents a direct bond C 1 to C 8 alkylene.
Claim 4
Dependent Claim
15 words
The method of claim 1 comprising molding said blend in contact with a reinforcing filler.
Claim 5
Dependent Claim
97 words
A random copolymer comprised of the following recurring units: ##STR7## wherein R represents --H, --CH 3 , or --CH 2 CH 3 ; R 1 represents --CH 3 , --CH 2 CH 3 , --CH(CH 3 ) 2 , --C(CH 3 ) 3 , --OH, --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 --Cl or --Br; x represents an integer of from 0 to 3; and, wherein y represents an integer of from 1 to 3.
Claim 6
Dependent Claim
97 words
A random copolymer comprised of the following recurring units: ##STR7## wherein R represents --H, --CH 3 , or --CH 2 CH 3 ; R 1 represents --CH 3 , --CH 2 CH 3 , --CH(CH 3 ) 2 , --C(CH 3 ) 3 , --OH, --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 --Cl or --Br; x represents an integer of from 0 to 3; and, wherein y represents an integer of from 1 to 3.
Claim 7
Dependent Claim
18 words
The random copolymer of claim 4 containing from about 2 to about 16 weight percent bromine or chlorine.
Claim 8
Dependent Claim
18 words
The random copolymer of claim 4 containing from about 3 to about 12 weight percent bromine or chlorine.
Claim 9
Dependent Claim
12 words
The random copolymer of claim 4 in the form of a foam.
References Cited (Backward Citations)
US4302484A
Cited
US4388451A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-01 | 1990-06-02 | 1990-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-01 | 1994-06-02 | 1994-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-01 | 1998-06-02 | 1998-12-02 | $7700.00 | Window Closed / Lapsed |