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US4352908A
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US
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Blends of polystrene or poly (p-methylstyrene) and p-methylstyrene-diene-styrene block copolymers
Assignee: Mobil Oil AS
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Filing: 1981-12-30
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Granted: 1982-10-05
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Expires: 2001-12-30
Abstract
Abstract Blends of polystyrene, poly(p-methylstyrene) or copolymers of styrene and p-methylstyrene; and an A-B-A' p-methylstyrene-conjugated diene-styrene block copolymer containing, by weight of the block copolymer, about 5-40% p-methylstyrene, about 5-40% styrene, and about 20-80% conjugated diene, are disclosed.
Inventors
- 👤 James G. Murray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:36
CPC Classifications
C; C08; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/06; C08L25/08; C08L25/16; C08L53/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
46 words
A blend comprising at least one polymer selected from the group consisting of poly(p-methylstyrene), polystyrene, and copolymers of styrene and p-methylstyrene; and an A-B-A' p-methylstyrene-conjugated diene-styrene block copolymer containing, by weight of the block copolymer, about 5-40% p-methylstyrene, about 5-40% styrene, and about 20-80% conjugated diene.
Claim 2
Dependent Claim
46 words
A blend comprising at least one polymer selected from the group consisting of poly(p-methylstyrene), polystyrene, and copolymers of styrene and p-methylstyrene; and an A-B-A' p-methylstyrene-conjugated diene-styrene block copolymer containing, by weight of the block copolymer, about 5-40% p-methylstyrene, about 5-40% styrene, and about 20-80% conjugated diene.
Claim 3
Dependent Claim
11 words
The blend of claim 1, wherein said conjugated diene is 1,3-butadiene.
Claim 4
Dependent Claim
11 words
The blend of claim 1, wherein said conjugated diene is isoprene.
Claim 5
Dependent Claim
20 words
The blend of claim 2 in which the block copolymer contains equal parts by weight of p-methylstyrene, 1,3-butadiene, and styrene.
Claim 6
Dependent Claim
17 words
The blend of claim 1 in which said polymer blended with the A-B-A' block copolymer is polystyrene.
Claim 7
Dependent Claim
17 words
The blend of claim 1 in which said polymer blended with the A-B-A' block copolymer is poly(p-methylstyrene).
Claim 8
Dependent Claim
22 words
The blend of claim 1 in which said polymer blended with the A-B-A' block copolymer is a mixture of polystyrene and poly(p-methylstyrene).
Claim 9
Dependent Claim
24 words
The blend of claims 1, 5, 6 or 7 in which said A-B-A' block copolymer comprises 1 to 99 weight percent of the composition.
Claim 10
Dependent Claim
24 words
The blend of claims 1, 5, 6 or 7 in which said A-B-A' block copolymer comprises 1 to 33 weight percent of the composition.
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) | 1985-10-04 | 1986-04-05 | 1986-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-04 | 1990-04-05 | 1990-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-04 | 1994-04-05 | 1994-10-05 | $7700.00 | Window Closed / Lapsed |