US4160792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic molding composition comprising styrene-maleimide and polycarbonate
Assignee: Atlantic Richfield Co
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Filing: 1978-10-10
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Granted: 1979-07-10
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Expires: 1998-10-10
Abstract
Abstract Thermoplastic molding compositions consist of: (a) 10-90% by weight copolymer of maleimide and styrene containing about 5-35% maleimide and 60-95% styrene; and (b) 10-90% by weight of a polycarbonate of a dihydric phenol and a derivative of carbonic acid.
Inventors
- 👤 Ronald A. Fava
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:26
CPC Classifications
C; C08; C08L; C08L51/00; C08L51/04; C08L69/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
50 words
A thermoplastic molding composition which comprises: A. from about 10% to about 90% by weight of a polycarbonate; B. from about 10% to about 90% by weight of a copolymer of maleimide and styrene containing from about 5% to about 35% maleimide and from about 65% to about 95% styrene.
Claim 2
Dependent Claim
50 words
A thermoplastic molding composition which comprises: A. from about 10% to about 90% by weight of a polycarbonate; B. from about 10% to about 90% by weight of a copolymer of maleimide and styrene containing from about 5% to about 35% maleimide and from about 65% to about 95% styrene.
Claim 3
Dependent Claim
20 words
The composition of claim 1 in which the concentration range of each component is from about 25% to about 75%.
Claim 4
Dependent Claim
15 words
The composition of claim 2 in which the concentration of each component is about 50%.
Claim 5
Dependent Claim
13 words
The composition of claim 1 in which the polycarbonate is a polyphenylene carbonate.
Claim 6
Dependent Claim
57 words
The composition of claim 1 in which the copolymer of maleimide and styrene is prepared by subjecting a copolymer of maleic anhydride and styrene to a basic aqueous nitrogenous system at a temperature of from about 125° to about 200° C. at an autogenous pressure for 0.5 to 48 hours and thereafter depressurizing and devolatilizing the product.
References Cited (Backward Citations)
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US4122130A
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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) | 1982-07-09 | 1983-01-08 | 1983-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-09 | 1987-01-08 | 1987-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-09 | 1991-01-08 | 1991-07-10 | $7700.00 | Window Closed / Lapsed |