US4288573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blends of low density ethylene polymers with certain polyesters
Assignee: Chevron USA Inc
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Filing: 1980-07-28
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Granted: 1981-09-08
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Expires: 2000-07-28
Abstract
Abstract A compatible blend of polymers is disclosed and consists essentially of 100 parts by weight of a low density ethylene polymer and about 0.2 to 3 parts by weight of either poly(ethylene adipate) or poly(trimethylene adipate). The polymer blends have a lower sealing temperature than the low density ethylene polymer contained therein.
Inventors
- 👤 Khalid A. Karim
- 👤 James H. Rea
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:34
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08L67/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
71 words
A compatible blend of polymers consisting essentially of: (a) 100 parts by weight of an ethylene polymer, and (b) About 0.2 to 3 parts by weight of a polyester resin; said ethylene polymer being a homopolymer of ethylene or copolymer of ethylene with higher alpha-olefins, having a density of less than about 0.945 and a melt index in the range of about 0.5-20, said polyester being poly(ethylene adipate) or poly(trimethylene adipate).
Claim 2
Dependent Claim
71 words
A compatible blend of polymers consisting essentially of: (a) 100 parts by weight of an ethylene polymer, and (b) About 0.2 to 3 parts by weight of a polyester resin; said ethylene polymer being a homopolymer of ethylene or copolymer of ethylene with higher alpha-olefins, having a density of less than about 0.945 and a melt index in the range of about 0.5-20, said polyester being poly(ethylene adipate) or poly(trimethylene adipate).
Claim 3
Dependent Claim
25 words
A composition of claim 1 containing 100 parts by weight of the ethylene copolymer and about 1 to 2 parts by weight of the polyester.
Claim 4
Dependent Claim
28 words
A composition of claim 1 in which the ethylene polymer has a density of less than about 0.94 and a melt index in the range of about 0.5-10.
Claim 5
Dependent Claim
28 words
A composition of claim 2 in which the ethylene polymer has a density of less than about 0.93 and a melt index in the range of about 0.5-5.0.
Claim 6
Dependent Claim
16 words
A composition of claim 1, 2, 3, or 4 in which the polyester is poly(ethylene adipate).
Claim 7
Dependent Claim
16 words
A composition of claim 1, 2, 3, or 4 in which the polyester is poly(trimethylene adipate).
Claim 8
Independent Claim
44 words
A method for lowering the seal temperature of a film of a low density ethylene polymer which consists essentially of uniformly dispersing about 0.2 to 3 parts by weight of poly(ethylene adipate) or poly(trimethylene adipate) in 100 parts by weight of said ethylene polymer.
Claim 9
Independent Claim
44 words
A method for lowering the seal temperature of a film of a low density ethylene polymer which consists essentially of uniformly dispersing about 0.2 to 3 parts by weight of poly(ethylene adipate) or poly(trimethylene adipate) in 100 parts by weight of said ethylene polymer.
Claim 10
Dependent Claim
25 words
The method of claim 7 in which about 1 to 2 parts of the poly(ethylene adipate) or poly(trimethylene adipate) are dispersed in the ethylene polymer.
Claim 11
Dependent Claim
13 words
A film of a polymer blend of claim 1, 2, 3, or 4.
References Cited (Backward Citations)
US3867324A
Cited
US3901838A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-07 | 1985-03-09 | 1985-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-07 | 1989-03-09 | 1989-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-07 | 1993-03-09 | 1993-09-08 | $7700.00 | Window Closed / Lapsed |