Patent US3159108A successfully refreshed from Google Patents.
US4525533A
Expired / Lapsed
US
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Polymer compositions
Assignee: MONTEFINA SA A CORP OF BELGIUM
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Filing: 1984-03-27
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Granted: 1985-06-25
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Expires: 2004-03-27
Abstract
Abstract A polymer composition is disclosed which comprises polystyrene, polypropylene and a sequenced copolymer of conjugated diene and vinylaromatic compound such as styrene which has a radial structure. The polymer composition has improved migration properties.
Inventors
- 👤 Jean-Noel Bertrand
- 👤 Jean Castelein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:16
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; C08L25/00; C08L25/02; C08L25/04; C08L25/06; C08L53/00; C08L53/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
76 words
A polymer composition comprising from about 30% to about 50% by weight of polystyrene, from about 30% to about 64% by weight of polypropylene and from about 6% to about 30% by weight of a sequenced radial type copolymer having a molecular weight not lower than about 100,000 wherein said radial type copolymer comprises from about 50% to about 70% by weight of conjugated diene and from about 30% to about 50% by weight of styrene.
Claim 2
Dependent Claim
76 words
A polymer composition comprising from about 30% to about 50% by weight of polystyrene, from about 30% to about 64% by weight of polypropylene and from about 6% to about 30% by weight of a sequenced radial type copolymer having a molecular weight not lower than about 100,000 wherein said radial type copolymer comprises from about 50% to about 70% by weight of conjugated diene and from about 30% to about 50% by weight of styrene.
Claim 3
Dependent Claim
42 words
The polymer composition according to claim 1 which comprises from about 8 to about 15% by weight of the sequenced copolymer, from about 40% to about 50% by weight of polypropylene and from about 40% to about 50% by weight of polystyrene.
Claim 4
Dependent Claim
30 words
The polymer composition according to claim 1 wherein the conjugated diene present in the sequenced copolymer is selected from the group which consists of butadiene, isoprene, 2,3-dimethyl-1,3-butadiene or mixtures thereof.
Claim 5
Dependent Claim
34 words
The polymer composition according to claim 1 wherein the sequenced copolymer comprises from bout 60 to about 70% by weight of conjugated diene and from about 40 to about 30% by weight of styrene.
Claim 6
Dependent Claim
38 words
The polymer composition according to claim 1 wherein the polystyrene used is selected from the group which consists of crystal polystyrene, high impact polystyrene containing at least 3% by weight of a rubbery material, or any combination thereof.
Claim 7
Dependent Claim
15 words
The polymer composition according to claim 1 wherein the polypropylene used is a crystalline polypropylene.
Claim 8
Dependent Claim
15 words
The polymer composition according to claim 6 wherein the polypropylene used contains a nucleation agent.
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) | 1988-06-24 | 1988-12-24 | 1989-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-24 | 1992-12-24 | 1993-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-24 | 1996-12-24 | 1997-06-25 | $7700.00 | Window Closed / Lapsed |