US4129614A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic molding composition of polymethyl methacrylate and rubber modified 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 Thermoplastic molding composition consists essentially of a blend of:
Inventors
- 👤 Ronald A. Fava
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:19
CPC Classifications
C; C08; C08L; C08L33/00; C08L33/04; C08L33/06; C08L33/10; C08L33/12; C08L51/00; C08L51/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
110 words
A thermoplastic molding composition which comprises: A. from about 20% to about 80% by weight of polymethyl methacrylate; B. from about 20% to about 80% by weight of a copolymer of three components: (aa) a rubbery block polymer prepared in a stereospecific system using from 5 to 35% vinyl aromatic compound and from 65 to 95% conjugated alkadiene, said rubbery block copolymer constituting from 5% to 35% of the copolymer of three components. (bb) an imide derivative of an ethylenically unsaturated dicarboxylic acid constituting from 5% to 35% of the copolymer of three components, and (cc) vinyl aromatic composition constituting from 60% to 90% of the copolymer of three components.
Claim 2
Dependent Claim
110 words
A thermoplastic molding composition which comprises: A. from about 20% to about 80% by weight of polymethyl methacrylate; B. from about 20% to about 80% by weight of a copolymer of three components: (aa) a rubbery block polymer prepared in a stereospecific system using from 5 to 35% vinyl aromatic compound and from 65 to 95% conjugated alkadiene, said rubbery block copolymer constituting from 5% to 35% of the copolymer of three components. (bb) an imide derivative of an ethylenically unsaturated dicarboxylic acid constituting from 5% to 35% of the copolymer of three components, and (cc) vinyl aromatic composition constituting from 60% to 90% of the copolymer of three components.
Claim 3
Dependent Claim
18 words
The composition of claim 1 in which the concentration of each of A and B is about 50%.
Claim 4
Dependent Claim
103 words
The composition of claim 1 in which said copolymer of three components is prepared by subjecting a copolymer of a rubbery block polymer prepared in a stereospecific system using from 5% to 35% vinyl aromatic compound and from 65% to 95% conjugated alkadiene, said rubbery block copolymer constituting from 5% to 35% of the copolymer of three components, from 5% to 35% maleic anhydride, and from 60% to 90% styrene to a basic aqueous nitrogenous system at a temperature of from about 125° to about 200° C. at an autogenous pressure of 0.5 to 48 hours and thereafter depressurizing and devolatilizing the product.
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 |