Patent US4145376A successfully refreshed from Google Patents.
US4145376A
Expired / Lapsed
US
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High impact polystyrene composition
Assignee: Labofina SA
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Filing: 1976-10-20
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Granted: 1979-03-20
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Expires: 1996-10-20
Abstract
Abstract A composition comprising a mixture of a styrene polymer, a rubbery dienic polymer and a sequenced copolymer of styrene and a diene, the total styrene polymer content which includes the free polystyrene and the polystyrene present in the sequenced copolymer is between 50 and 99% by weight of the composition, the total rubber content, which include the rubbery dienic polymer and the dienic polymer present in the sequenced copolymer, is between 1 and 50% by weight of the composition, the amount of sequenced copolymer being such as to bring to the composition from 3 to 90% by weight of the total rubber in the composition.
Inventors
- 👤 William J. I. Bracke
- 👤 Jean N. M. Bertrand
- 👤 Jacques T. L. Zegers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:07
CPC Classifications
C; C08; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/06; C08L53/00; C08L53/02; C08L21/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
107 words
A composition consisting essentially of a mixture of a styrene polymer, a rubbery dienic polymer and a sequenced copolymer of styrene and a diene, the total styrene polymer content which includes the free polystyrene and the polystyrene present in the sequenced copolymer is between 50 and 99% by weight of the composition, the total rubber content, which include the rubbery dienic polymer and the dienic polymer present in the sequenced copolymer, is between 1 and 50% by weight of the composition, the amount of sequenced copolymer being such as to bring to the composition from 3 to 90% by weight of the total rubber in the composition.
Claim 2
Dependent Claim
107 words
A composition consisting essentially of a mixture of a styrene polymer, a rubbery dienic polymer and a sequenced copolymer of styrene and a diene, the total styrene polymer content which includes the free polystyrene and the polystyrene present in the sequenced copolymer is between 50 and 99% by weight of the composition, the total rubber content, which include the rubbery dienic polymer and the dienic polymer present in the sequenced copolymer, is between 1 and 50% by weight of the composition, the amount of sequenced copolymer being such as to bring to the composition from 3 to 90% by weight of the total rubber in the composition.
Claim 3
Dependent Claim
13 words
The composition of claim 1 wherein a peroxide is added to said composition.
Claim 4
Dependent Claim
18 words
The composition of claim 2 wherein the amount of said peroxide is no more than 0.5% by weight.
Claim 5
Dependent Claim
24 words
The composition of claim 2 wherein said peroxide is selected from the group consisting of cumyl hydroperoxide, tert-butyl hydroperoxide, dicumyl hydroperoxide, and mixtures thereof.
Claim 6
Dependent Claim
22 words
The composition of claim 1 wherein the sequenced copolymer contains at least a polystyrene chain and at least a diene polymer chain.
Claim 7
Dependent Claim
43 words
The composition of claim 5 wherein said sequenced polymer is one selected from the group consisting of di-block type A-B, ter-block type A-B-A or B-A-B wherein A is a polystyrene chain and B is a polybutadiene chain, radial type copolymers and mixtures thereof.
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) | 1982-03-19 | 1982-09-18 | 1983-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-19 | 1986-09-18 | 1987-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-19 | 1990-09-18 | 1991-03-20 | $7700.00 | Window Closed / Lapsed |