Patent US4308358A successfully refreshed from Google Patents.
US4308358A
Expired / Lapsed
US
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High impact polystyrene blend compositions
Assignee: Shell USA Inc
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Filing: 1980-04-30
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Granted: 1981-12-29
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Expires: 2000-04-30
Abstract
Abstract High impact polystyrene compositions are prepared by the intimate melt mixing of a styrene polymer and a particular AB two-block copolymer. The A block is a polymer of a monoalkenyl arene having a specified molecular weight range and the B block is a butadiene polymer block having a 1,2 vinyl content of greater than about 20 percent.
Inventors
- 👤 Charles R. Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:40
CPC Classifications
C; C08; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/06; C08F; C08F297/00; C08F297/02; C08F297/04; C08L53/00; C08L53/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
75 words
An AB block copolymer wherein (a) said A block is a polymer block of a monoalkenyl arene having a weight average molecular weight between about 20,000 and about 150,000, (b) the weight percent of said A block in said block copolymer is between about 15 percent by weight and about 35 percent by weight; and (c) said B block is a polymer block of butadiene having a vinyl 1,2 configuration of 20 percent or greater.
Claim 2
Dependent Claim
75 words
An AB block copolymer wherein (a) said A block is a polymer block of a monoalkenyl arene having a weight average molecular weight between about 20,000 and about 150,000, (b) the weight percent of said A block in said block copolymer is between about 15 percent by weight and about 35 percent by weight; and (c) said B block is a polymer block of butadiene having a vinyl 1,2 configuration of 20 percent or greater.
Claim 3
Dependent Claim
16 words
A polymer according to claim 1 wherein said A block is a polymer block of polystyrene.
Claim 4
Dependent Claim
18 words
A polymer according to claim 1 wherein said vinyl 1,2 content is between 20 percent and 60 percent.
Claim 5
Dependent Claim
15 words
A polymer according to claim 3 wherein said vinyl 1,2 content is over 25 percent.
Claim 6
Dependent Claim
24 words
A polymer according to claim 1 or claim 4 wherein the molecular weight of said A block is between about 30,000 and about 100,000.
Claim 7
Dependent Claim
21 words
A polymer according to claim 5 wherein the molecular weight of said A block is between about 30,000 and about 60,000.
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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) | 1984-12-28 | 1985-06-29 | 1985-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-28 | 1989-06-29 | 1989-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-28 | 1993-06-29 | 1993-12-29 | $7700.00 | Window Closed / Lapsed |