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US4129619A
Expired / Lapsed
US
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Moldable blend of polymethyl methacrylate and styrene-maleimide
Assignee: Lyondell Chemical Technology LP
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Filing: 1977-12-23
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Granted: 1978-12-12
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Expires: 1997-12-23
Abstract
Abstract A molding composition suitable for thermoplastic molding operations consists of a blend of:
Inventors
- 👤 Ronald A. Fava
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:26
CPC Classifications
C; C08; C08L; C08L33/00; C08L33/04; C08L33/06; C08L33/10; C08L33/12; C08L35/00; C08L35/06; C08L25/00; C08L25/02; C08L25/04; C08L25/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
53 words
A molding composition suitable for thermoplastic molding operations which comprises a blend of: (a) 10-90% by weight polymethyl methacrylate; (b) 10-90% by weight of the copolymer derived by copolymerizing from about 5% to about 35% imide derivative of an ethylenically unsaturated dicarboxylic acid, and from about 65% to about 95% vinyl aromatic composition.
Claim 2
Dependent Claim
53 words
A molding composition suitable for thermoplastic molding operations which comprises a blend of: (a) 10-90% by weight polymethyl methacrylate; (b) 10-90% by weight of the copolymer derived by copolymerizing from about 5% to about 35% imide derivative of an ethylenically unsaturated dicarboxylic acid, and from about 65% to about 95% vinyl aromatic composition.
Claim 3
Dependent Claim
23 words
The composition of claim 1 in which the concentration range of each of (a) and (b) is from about 25% to about 75%.
Claim 4
Dependent Claim
18 words
The composition of claim 2 in which the concentration of each of (a) and (b) is about 50%.
Claim 5
Dependent Claim
15 words
The composition of claim 1 in which (b) is a copolymer of maleimide and styrene.
Claim 6
Dependent Claim
13 words
The composition of claim 4 in which the copolymer contains about 8% maleimide.
Claim 7
Dependent Claim
29 words
The composition of claim 5 in which (b) is prepared by subjecting a corresponding copolymer of styrene and maleic anhydride to aqueous ammonia at an elevated temperature and pressure.
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) | 1981-12-11 | 1982-06-12 | 1982-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-11 | 1986-06-12 | 1986-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-11 | 1990-06-12 | 1990-12-12 | $7700.00 | Window Closed / Lapsed |