US4910254A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Films of olefin polymers and graft copolymers
Assignee: Dow Chemical Co
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Filing: 1987-09-24
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Granted: 1990-03-20
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Expires: 2007-09-24
Abstract
Abstract A film prepared from a compatibilized resin blend comprising an olefin polymer, a polymer of a vinyl aromatic monomer and a compatibilizing amount of a graft copolymer of a vinyl aromatic monomer and an EPDM rubber exhibits improved properties making it highly desirable in such end uses as grocery and trash bags.
Inventors
- 👤 Robert T. Johnston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:22
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C08L; C08L23/00; C08L23/02; C08L23/04; C08L25/00; C08L25/02; C08L25/04; C08J2323/00; C08J2323/02; C08J2323/04; C08L51/00; C08L51/06; Y; Y10; Y10S; Y10S525/00; Y10S525/931
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
163 words
A cast or blown film prepared from a compatibilized blend comprising: (a) an olefin polymer, (b) a polymer of a vinyl monomer selected from the group consisting of homopolymers of styrene and C 1-4 ring alkylated or halogenated styrene containing from 1 to 4 ring substituents; copolymers of more than one monomer selected from the group consisting of styrene and C 1-4 ring alkylated or halogenated styrene containing from 1 to 4 ring substituents; and copolymers of styrene or C 1-4 alkylated or halogenated styrene containing from 1 to 4 ring substituents with a copolymerizable comonomer selected from the group consisting of ethylenically unsaturated carboxylic acids, esters, nitriles and amides, and (c) a compatibilizing amount of a graft copolymer prepared by polymerizing a vinyl aromatic monomer alone or with a copolymerizing ethylenically unsaturated carboxylic acid, ester, nitrile or amide in the presence of from 0.5 to 20% based on monomer weight of a rubbery interpolymer of ethylene, propylene and a non-conjugated copolymerizable diene.
Claim 2
Dependent Claim
163 words
A cast or blown film prepared from a compatibilized blend comprising: (a) an olefin polymer, (b) a polymer of a vinyl monomer selected from the group consisting of homopolymers of styrene and C 1-4 ring alkylated or halogenated styrene containing from 1 to 4 ring substituents; copolymers of more than one monomer selected from the group consisting of styrene and C 1-4 ring alkylated or halogenated styrene containing from 1 to 4 ring substituents; and copolymers of styrene or C 1-4 alkylated or halogenated styrene containing from 1 to 4 ring substituents with a copolymerizable comonomer selected from the group consisting of ethylenically unsaturated carboxylic acids, esters, nitriles and amides, and (c) a compatibilizing amount of a graft copolymer prepared by polymerizing a vinyl aromatic monomer alone or with a copolymerizing ethylenically unsaturated carboxylic acid, ester, nitrile or amide in the presence of from 0.5 to 20% based on monomer weight of a rubbery interpolymer of ethylene, propylene and a non-conjugated copolymerizable diene.
Claim 3
Dependent Claim
19 words
A film according to claim 1 wherein the olefin polymer is low density polyethylene or linear low density polyethylene.
Claim 4
Dependent Claim
50 words
A film according to claim 1 wherein the vinyl aromatic monomer employed in both the graft polymer and the polymer of a vinyl aromatic monomer is styrene and the rubbery polymer is an interpolymer of ethylene, propylene and a diene selected from the group consisting of 1,4-hexadiene, dicyclopentadiene and 5-ethylidene-2-norbornene.
Claim 5
Dependent Claim
22 words
A film according to claim 1 comprising low density polyethylene and from 0.1 to about 3.0% by weight of a graft copolymer.
Claim 6
Dependent Claim
23 words
A film according to claim 1 comprising linear low density polyethylene and from 0.2 to about 5.0% by weight of a graft copolymer.
Claim 7
Dependent Claim
24 words
A film according to claim 1 wherein the graft copolymer comprises from about 1 to 5% based on monomer weight of a rubbery interpolymer.
Claim 8
Dependent Claim
28 words
The film according to claim 1, wherein the polymer of a vinyl aromatic monomer is present in an amount from 0.5 to 20 weight percent of the film.
Claim 9
Dependent Claim
28 words
The film according to claim 7, wherein the polymer of a vinyl aromatic monomer is present in an amount from 0.5 to 10 weight percent of the film.
Claim 10
Dependent Claim
30 words
The film according to claim 8, wherein the polymer of a vinyl aromatic monomer is present in an amount from 0.5 to less than 5 weight percent of the film.
Claim 11
Dependent Claim
10 words
A bag prepared from a film according to claim 1.
Claim 12
Dependent Claim
19 words
The bag according to claim 10 wherein the olefin polymer is low density polyethylene or linear low density polyethylene.
Claim 13
Dependent Claim
50 words
The bag according to claim 10 wherein the vinyl aromatic monomer employed in both the graft polymer and the polymer of a vinyl aromatic monomer is styrene and the rubbery polymer is an interpolymer of ethylene, propylene and a diene selected from the group consisting of 1,4-hexadiene, dicyclopentadiene and 5-ethylidene-2-norbornene.
Claim 14
Dependent Claim
22 words
The bag according to claim 10 comprising low density polyethylene and from 0.1 to about 3.0% by weight of a graft copolymer.
Claim 15
Dependent Claim
26 words
The bag according to claim 10 wherein the film comprises linear low density polyethylene and from 0.2 to about 5.0% by weight of a graft copolymer.
Claim 16
Dependent Claim
24 words
The bag according to claim 10 wherein the graft copolymer comprises from about 1 to 5% based on monomer weight of a rubbery interpolymer.
Claim 17
Dependent Claim
28 words
The bag according to claim 10 wherein the polymer of a vinyl aromatic monomer is present in an amount from 0.5 to 20 weight percent of the film.
Claim 18
Dependent Claim
28 words
The bag according to claim 16 wherein the polymer of a vinyl aromatic monomer is present in an amount from 0.5 to 10 weight percent of the film.
Claim 19
Dependent Claim
30 words
The bag according to claim 17, wherein the polymer of a vinyl aromatic monomer is present in an amount from 0.5 to less than 5 weight percent of the film.
References Cited (Backward Citations)
US4690976A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-19 | 1993-09-18 | 1994-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-19 | 1997-09-18 | 1998-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-19 | 2001-09-18 | 2002-03-20 | $7700.00 | Window Closed / Lapsed |