US4690976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blends of olefinic and monovinylidene aromatic polymers
Assignee: Dow Chemical Co
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Filing: 1986-01-21
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Granted: 1987-09-01
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Expires: 2006-01-21
Abstract
Abstract A polymer resin comprising a blend of an olefin polymer, such as polyethylene, a monovinylidene aromatic polymer, such as polystyrene, and a grafted, block copolymer compatibilizing agent. The compatibilizing agent comprises an α-olefin copolymer substrate grafted with amounts of monovinylidene aromatic polymer. Preferably, the α-olefin copolymer substrate is a terpolymer of ethylene, propylene and a non-conjugated diolefin. This thermoplastic material has very desirable property combinations, combining the desirable properties from the olefinic and monovinylidene aromatic polymers. The blend can be shaped into final products by thermoforming techniques yet possesses many desirable polyolefin properties such as environmental stress crack resistance.
Inventors
- 👤 Jerry L. Hahnfeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:16
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08L23/10; C08L23/16; C08L25/00; C08L25/02; C08L25/04; C08L25/06; C08L2205/00; C08L2205/03; C08L2207/00; C08L2207/06; C08L2207/062; Y; Y10; Y10S; Y10S525/00; Y10S525/931
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
111 words
A polymer blend composition comprising: (a) at least about 20 weight percent olefin polymer, said weight percent being based on the weight of components (a), (b) and (c); (b) at least about 5 weight percent monovinylidene aromatic polymer based on the weight of components (a), (b) and (c); and (c) a compatibilizing amount of a monovinylidene aromatic polymer-grafted α-olefin copolymer provided that the α-olefin copolymer of component (c) is different from and nonmiscible with the olefin polymer of component (a) and comprises a polymer of an α-olefin monomer having from 2 to 4 carbon atoms and at least one additional different polymerizable alpha-olefin monomer having from 3 to 16 carbon atoms.
Claim 2
Dependent Claim
111 words
A polymer blend composition comprising: (a) at least about 20 weight percent olefin polymer, said weight percent being based on the weight of components (a), (b) and (c); (b) at least about 5 weight percent monovinylidene aromatic polymer based on the weight of components (a), (b) and (c); and (c) a compatibilizing amount of a monovinylidene aromatic polymer-grafted α-olefin copolymer provided that the α-olefin copolymer of component (c) is different from and nonmiscible with the olefin polymer of component (a) and comprises a polymer of an α-olefin monomer having from 2 to 4 carbon atoms and at least one additional different polymerizable alpha-olefin monomer having from 3 to 16 carbon atoms.
Claim 3
Dependent Claim
16 words
A composition according to claim 1 comprising from about 20 to about 90 weight percent (a).
Claim 4
Dependent Claim
16 words
A composition according to claim 1 comprising from about 5 to about 75 weight percent (b).
Claim 5
Dependent Claim
26 words
A composition according to claim 1 comprising from about 1 to about 20 weight percent (c) based on the weight of components (a), (b) and (c).
Claim 6
Dependent Claim
16 words
A composition according to claim 1 comprising from about 2 to about 15 weight percent (c).
Claim 7
Dependent Claim
13 words
A composition according to claim 1 consisting essentially of (a), (b) and (c).
Claim 8
Dependent Claim
10 words
A composition according to claim 1 wherein (a) is polyethylene.
Claim 9
Dependent Claim
12 words
A composition according to claim 1 wherein (a) is high density polyethylene.
Claim 10
Dependent Claim
13 words
A composition according to claim 1 wherein (a) is linear low density polyethylene.
Claim 11
Dependent Claim
12 words
A composition according to claim 1 wherein (a) is low density polyethylene.
Claim 12
Dependent Claim
10 words
A composition according to claim 1 wherein (a) is polypropylene.
Claim 13
Dependent Claim
17 words
A composition according to claim 1 wherein the monovinylidene aromatic polymer of (b) and (c) is polystyrene.
Claim 14
Dependent Claim
17 words
A composition according to claim 1 wherein the monovinylidene aromatic polymer of (b) and (c) is poly-para-vinyltoluene.
Claim 15
Dependent Claim
54 words
A composition according to claim 1 wherein the α-olefin copolymer comprises from about 80 to about 20 weight percent of an α-olefin monomer having from 2 to 4 carbon atoms and from about 20 to about 80 weight percent of at least one different polymerizable olefin monomer having from 3 to 16 carbon atoms.
Claim 16
Dependent Claim
31 words
A composition according to claim 1 wherein the α-olefin copolymer comprises from about 80 to about 20 weight percent of ethylene and from about 20 to about 80 weight percent propylene.
Claim 17
Dependent Claim
42 words
A composition according to claim 15 wherein the α-olefin copolymer comprises from about 80 to about 20 weight percent ethylene, from about 20 to about 80 weight percent propylene and from about 1 to about 15 weight percent of a non-conjugated diolefin.
Claim 18
Dependent Claim
12 words
A composition according to claim 16 wherein the non-conjugated diolefin is 5-ethylidene-2-norbornene.
Claim 19
Dependent Claim
10 words
An article prepared from a composition according to claim 1.
Claim 20
Dependent Claim
40 words
A method for preparing the blend composition of claim 1 comprising combining about 20 percent by weight olefin polymer, at least about 5 percent by weight monovinylidene aromatic polymer and a compatibilizing amount of a monovinylidene aromatic polymer-grafted α-olefin copolymer.
Claim 21
Dependent Claim
14 words
A composition according to claim 1 comprising at least about 35 weight percent (a).
Claim 22
Dependent Claim
14 words
A composition according to claim 1 comprising at least about 40 weight percent (a).
Claim 23
Dependent Claim
16 words
A composition according to claim 1 comprising from about 40 to about 75 weight percent (a).
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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) | 1990-08-31 | 1991-03-02 | 1991-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-31 | 1995-03-02 | 1995-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-31 | 1999-03-02 | 1999-09-01 | $7700.00 | Window Closed / Lapsed |