US4704431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blends of polypropylene and vinylaromatic/α-methylstyrene copolymers
Assignee: Dow Chemical Co
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Filing: 1986-04-04
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Granted: 1987-11-03
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Expires: 2006-04-04
Abstract
Abstract A polymer resin comprising a blend of polypropylene, a copolymer of a vinylaromatic monomer and α-methylstyrene prepared by anionic polymerization at a temperature above 61° C. and a monovinylidene aromatic polymer grafted α-olefin copolymer compatibilizing agent.
Inventors
- 👤 Van I. W. Stuart
- 👤 Duane B. Priddy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:13
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; C08L25/00; C08L25/02; C08L25/16; C08L51/00; C08L51/06; Y; Y10; Y10S; Y10S525/00; Y10S525/931
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
87 words
A polymer blend comprising: (a) from about 15 to about 85 weight percent polypropylene; (b) from about 15 to about 85 weight percent of a vinylaromatic/α-methylstyrene copolymer prepared by anionic polymerization at a temperature above 61° C.; and (c) a compatibilizing amount of a monovinylidene aromatic polymer-grafted α-olefin copolymer prepared by anionic graft polymerization said α-olefin copolymer comprising a polymer of an -olefin monomer having from 1 to 4 carbon atoms and at least one additional different polymerizable mono-olefin monomer having from 3 to 16 carbon atoms.
Claim 2
Dependent Claim
87 words
A polymer blend comprising: (a) from about 15 to about 85 weight percent polypropylene; (b) from about 15 to about 85 weight percent of a vinylaromatic/α-methylstyrene copolymer prepared by anionic polymerization at a temperature above 61° C.; and (c) a compatibilizing amount of a monovinylidene aromatic polymer-grafted α-olefin copolymer prepared by anionic graft polymerization said α-olefin copolymer comprising a polymer of an -olefin monomer having from 1 to 4 carbon atoms and at least one additional different polymerizable mono-olefin monomer having from 3 to 16 carbon atoms.
Claim 3
Dependent Claim
14 words
A polymer blend according to claim 1, wherein component (b) is a styrene/α-methylstyrene copolymer.
Claim 4
Dependent Claim
20 words
A polymer blend according to claim 1, wherein the monovinylidene aromatic polymer grafted α-olefin copolymer is a grafted EPDM copolymer.
Claim 5
Dependent Claim
22 words
A polymer blend according to claim 3, wherein the monovinylidene aromatic-grafted EPDM copolymer is grafted with a copolymer of styrene and α-methylstyrene.
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) | 1990-11-02 | 1991-05-04 | 1991-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-02 | 1995-05-04 | 1995-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-02 | 1999-05-04 | 1999-11-03 | $7700.00 | Window Closed / Lapsed |