US4221880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moldable blend of interpolymer of rubber, maleic anhydride and styrene with polyphenylene oxide
Assignee: Lyondell Chemical Technology LP
•
Filing: 1978-11-20
•
Granted: 1980-09-09
•
Expires: 1998-11-20
Abstract
Abstract The invention concerns thermoplastic molding compositions consisting essentially of a blend of: A. From about 40% to about 95% by weight of a interpolymer comprising from about 8 to about 15% block interpolymers prepared in a stereospecific system using from 5% to 35% vinyl aromatic compound and from 65 to 95% conjugated alkadiene, and about 84 to about 92% of a mixture containing from about 88 to about 93% sytrene and from about 7 to about 12% unsaturated dicarboxylic acid anhydride selected from the group consisting of maleic anhydride and citraconic anhydride. B. From about 5% to about 60% of a polyphenylene oxide.
Inventors
- 👤 Ronald A. Fava
- 👤 Kenneth W. Doak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:56
CPC Classifications
C; C08; C08L; C08L51/00; C08L71/00; C08L71/08; C08L71/10; C08L71/12; C08L71/123
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
Thermoplastic molding compositions consisting of a two-component blend of: A. From about b 40% to about 95% by weight of an interpolymer comprising from about 8 to about 16% block copolymer prepared in a stereospecific system using from 5% to 35% vinyl aromatic compound and from 65 to 95% conjugated alkadiene, and polymerizing in the presence of said block copolymer about 84 to about 92% of a mixture containing from about 88 to about 93% styrene and from about 7 to about 12% unsaturated dicarboxylic acid anhydride selected from the group consisting of maleic selected from the group consisting of maleic anhydride and citraconic anhydride. B. From about 5% to about 60% of a polyphenylene oxide.
Claim 2
Dependent Claim
116 words
Thermoplastic molding compositions consisting of a two-component blend of: A. From about b 40% to about 95% by weight of an interpolymer comprising from about 8 to about 16% block copolymer prepared in a stereospecific system using from 5% to 35% vinyl aromatic compound and from 65 to 95% conjugated alkadiene, and polymerizing in the presence of said block copolymer about 84 to about 92% of a mixture containing from about 88 to about 93% styrene and from about 7 to about 12% unsaturated dicarboxylic acid anhydride selected from the group consisting of maleic selected from the group consisting of maleic anhydride and citraconic anhydride. B. From about 5% to about 60% of a polyphenylene oxide.
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) | 1983-09-09 | 1984-03-10 | 1984-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-09 | 1988-03-10 | 1988-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-09 | 1992-03-10 | 1992-09-09 | $7700.00 | Window Closed / Lapsed |