US4329272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame-retardant polymers
Assignee: Monsanto Co
•
Filing: 1981-03-17
•
Granted: 1982-05-11
•
Expires: 2001-03-17
Abstract
Abstract Styrene/maleic anhydride polymers can be made more resistant to combustion by incorporation therein of minor amounts of polyvinyl chloride. The compositions can also comprise MBS, ABS and other flame retardant additives.
Inventors
- 👤 Daniel L. Dufour
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:22
CPC Classifications
C; C08; C08L; C08L35/00; C08L35/06; C08L27/00; C08L27/02; C08L27/04; C08L27/06; C08L51/00; C08L51/04; C08L55/00; C08L55/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
130 words
A molding composition comprising: A. from 30 to 40% by weight of a uniform polymer comprising 50 to 85% by weight of a vinylaromatic monomer, from 15 to 30% by weight of an unsaturated dicarboxylic acid anhydride and from 0 to 20% of a copolymerizable monomer; B. from 30 to 40% by weight of polyvinyl chloride; and C. from 30 to 40% by weight of a composition comprising a graft copolymer of from 20 to 40% by weight of a monomer selected from the group consisting of methyl methacrylate and acrylonitrile and 80 to 60% by weight of a vinyl aromatic monomer, said copolymer being grafted on to from 10 to 60% of the weight of the composition of a substrate rubber having a glass transition temperature below 0° C.
Claim 2
Dependent Claim
130 words
A molding composition comprising: A. from 30 to 40% by weight of a uniform polymer comprising 50 to 85% by weight of a vinylaromatic monomer, from 15 to 30% by weight of an unsaturated dicarboxylic acid anhydride and from 0 to 20% of a copolymerizable monomer; B. from 30 to 40% by weight of polyvinyl chloride; and C. from 30 to 40% by weight of a composition comprising a graft copolymer of from 20 to 40% by weight of a monomer selected from the group consisting of methyl methacrylate and acrylonitrile and 80 to 60% by weight of a vinyl aromatic monomer, said copolymer being grafted on to from 10 to 60% of the weight of the composition of a substrate rubber having a glass transition temperature below 0° C.
Claim 3
Dependent Claim
43 words
A composition according to claim 1 comprising from 1 to 10% by weight of a flame retardant additive selected from the group consisting of decabromodiphenylether, halogenated (di)methanodibenzocyclooctene adducts, halogenated paraffin hydrocarbons, halogenated octadienecyclopentadiene adducts, tetrabromobisphenol A, tetrabromoxylene, pentabromoethylbenzene, tetrabromobisphenol A diacetate, and bis(tribromophenoxy)ethane.
Claim 4
Dependent Claim
31 words
A composition according to claim 1 in which Component A comprises a copolymerizable monomer selected from the group consisting of C 1 to C 3 acrylates and methacrylates and unsaturated nitriles.
Claim 5
Dependent Claim
20 words
A composition according to claim 3 in which Component A comprises from 5 to 15% by weight of methyl methacrylate.
References Cited (Backward Citations)
CA900079A
Cited
US3632839A
Cited
US3626033A
Cited
US3641212A
Cited
US3717688A
Cited
US3759863A
Cited
GB1354000A
Cited
US3720734A
Cited
US3919354A
Cited
US3919354B1
Cited
US3882192A
Cited
US4269950A
Cited
US4048263A
Cited
US4205140A
Cited
US4234701A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-10 | 1985-11-09 | 1986-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-10 | 1989-11-09 | 1990-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-10 | 1993-11-09 | 1994-05-11 | $7700.00 | Window Closed / Lapsed |