Patent US4173597A successfully refreshed from Google Patents.
US4173597A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impact styrene polymer blends with thermoplastic elastomers
Assignee: Phillips Petroleum Co
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Filing: 1978-01-23
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Granted: 1979-11-06
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Expires: 1998-01-23
Abstract
Abstract A blend comprising (1) a styrene polymer and (2) thermoplastic elastomer of a monovinyl-substituted aromatic compound and a conjugated diene having a melt flow within the range of 2-15, said blend having a diene content within the range of 18-24 weight percent. Such blends have outstanding toughness.
Inventors
- 👤 Kenneth W. Willcox
- 👤 Fay W. Bailey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:15
CPC Classifications
C; C08; C08L; C08L53/00; C08L53/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
75 words
A blend having a polymerized diene content within the range of 18 to 24 weight percent based on a total weight of said blend comprising: a styrene polymer; and a thermoplastic elastomer having a melt flow within the range of 2-15 at 180° C. in accordance with ASTM D 1238-65T with a 5 kg weight, said thermoplastic elastomer being a block copolymer of at least one conjugated diene and at least one monovinyl-substituted aromatic compound.
Claim 2
Dependent Claim
75 words
A blend having a polymerized diene content within the range of 18 to 24 weight percent based on a total weight of said blend comprising: a styrene polymer; and a thermoplastic elastomer having a melt flow within the range of 2-15 at 180° C. in accordance with ASTM D 1238-65T with a 5 kg weight, said thermoplastic elastomer being a block copolymer of at least one conjugated diene and at least one monovinyl-substituted aromatic compound.
Claim 3
Dependent Claim
13 words
A composition according to claim 1 wherein said styrene polymer is polystyrene homopolymer.
Claim 4
Dependent Claim
18 words
A composition according to claim 2 wherein said thermoplastic elastomer is a block copolymer of 1,3-butadiene and styrene.
Claim 5
Dependent Claim
15 words
A composition according to claim 3 wherein said block copolymer has a linear ABA structure.
Claim 6
Dependent Claim
40 words
A composition according to claim 3 wherein said block copolymer has a radial (AB) n Y configuration where Y is a residue of a polyfunctional coupling agent or a polyfunctional initiator and n has a value of greater than 2.
Claim 7
Dependent Claim
19 words
A composition according to claim 3 wherein said blend has a polymerized diene content of about 20 weight percent.
Claim 8
Dependent Claim
26 words
A composition according to claim 1 wherein said block copolymer has a weight ratio of conjugated diene/monovinyl-substituted aromatic compound within the range of 60/40 to 75/25.
Claim 9
Dependent Claim
25 words
A composition according to claim 7 wherein said block copolymer is a block copolymer of 1,3-butadiene and styrene and said styrene polymer is polystyrene homopolymer.
Claim 10
Dependent Claim
21 words
A composition according to claim 8 wherein said block copolymer has a weight ratio of butadiene to styrene of about 70/30.
Claim 11
Dependent Claim
19 words
A composition according to claim 9 wherein said blend has a polymerized diene content of about 20 weight percent.
References Cited (Backward Citations)
US3637554A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-11-05 | 1983-05-07 | 1983-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-05 | 1987-05-07 | 1987-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-05 | 1991-05-07 | 1991-11-06 | $7700.00 | Window Closed / Lapsed |