Patent US4522983A successfully refreshed from Google Patents.
US4522983A
Expired / Lapsed
US
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Polymeric molding composition
Assignee: Lyondell Chemical Technology LP
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Filing: 1983-03-09
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Granted: 1985-06-11
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Expires: 2003-03-09
Abstract
Abstract Polymeric composition having good impact resistance which comprises styrene, methylstyrene, a conjugated diene monomer, and optionally an unsaturated dicarboxylic acid anhydride, are described.
Inventors
- 👤 Bi Le-Khac
- 👤 Clyde Sharik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 05:45
CPC Classifications
C; C08; C08F; C08F279/00; C08F279/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
109 words
A polymeric molding composition resulting from the polymerization of 100 parts by weight of (A) from about 55 to about 99.8% by weight styrene, (B) from about 0.2 to about 5% or more by weight of at least one isomer of methylstyrene selected from the group consisting of para-methylstyrene, ortho-methylstyrene and meta methylstyrene, (C) from 5 to about 40% by weight of an unsaturated dicarboxylic acid anhydride, wherein the percentages of (A), (B) and (C) are based on the total combined weight of (A) plus (B) plus (C), in the presence of from about 1 to about 40 total parts by weight of at least one preformed rubbery polymer.
Claim 2
Dependent Claim
109 words
A polymeric molding composition resulting from the polymerization of 100 parts by weight of (A) from about 55 to about 99.8% by weight styrene, (B) from about 0.2 to about 5% or more by weight of at least one isomer of methylstyrene selected from the group consisting of para-methylstyrene, ortho-methylstyrene and meta methylstyrene, (C) from 5 to about 40% by weight of an unsaturated dicarboxylic acid anhydride, wherein the percentages of (A), (B) and (C) are based on the total combined weight of (A) plus (B) plus (C), in the presence of from about 1 to about 40 total parts by weight of at least one preformed rubbery polymer.
Claim 3
Dependent Claim
27 words
The polymeric molding composition of claim 1 in which (B) is present in an amount within the range of from about 0.5 to about 3% by weight.
Claim 4
Dependent Claim
18 words
The polymeric molding composition of claim 1 in which (B) is substantially para-methylstyrene and (C) is maleic anhydride.
Claim 5
Dependent Claim
16 words
The polymeric molding composition of claim 1 in which the preformed rubbery polymer is styrene-butadiene rubber.
Claim 6
Dependent Claim
106 words
A process comprising polymerizing in the presence of a free-radical initiator, 100 parts by weight of (A) from about 55 to about 99.8% by weight styrene, (B) from about 0.2 to about 5% by weight of an isomer of methylstyrene selected from the group consisting of para-methylstyrene ortho-methylstyrene and meta-methylstyrene, and (C) from 5 to about 40% by weight of an unsaturated dicarboxylic acid anhydride wherein the given percentages of (A), (B) and (C) are based on the combined weight of (A) plus (B) plus (C), in the presence of from about 1 to about 40 parts by weight of at least one preformed rubbery polymer.
Claim 7
Dependent Claim
106 words
A process comprising polymerizing in the presence of a free-radical initiator, 100 parts by weight of (A) from about 55 to about 99.8% by weight styrene, (B) from about 0.2 to about 5% by weight of an isomer of methylstyrene selected from the group consisting of para-methylstyrene ortho-methylstyrene and meta-methylstyrene, and (C) from 5 to about 40% by weight of an unsaturated dicarboxylic acid anhydride wherein the given percentages of (A), (B) and (C) are based on the combined weight of (A) plus (B) plus (C), in the presence of from about 1 to about 40 parts by weight of at least one preformed rubbery polymer.
Claim 8
Dependent Claim
11 words
The process of claim 5 in which (B) is substantially para-methylstyrene.
Claim 9
Dependent Claim
11 words
The process of claim 5 in which (C) is maleic anhydride.
Claim 10
Dependent Claim
14 words
The process of claim 5 in which the preformed rubbery polymer is styrene-butadiene rubber.
References Cited (Backward Citations)
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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) | 1988-06-10 | 1988-12-10 | 1989-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-10 | 1992-12-10 | 1993-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-10 | 1996-12-10 | 1997-06-11 | $7700.00 | Window Closed / Lapsed |