US4273893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ternary blends of low density ethylene polymers, ethylene-alkyl acrylate copolymers and amorphous isobutylene polymers
Assignee: Chevron USA Inc
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Filing: 1980-07-31
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Granted: 1981-06-16
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Expires: 2000-07-31
Abstract
Abstract Compatible ternary polymer blends are disclosed which consist essentially of a low density ethylene polymer, an ethylene-alkyl acrylate copolymer, and an amorphous isobutylene polymer. The compositions seal well at temperatures below those required for heat sealing ethylene polymers.
Inventors
- 👤 Khalid A. Karim
- 👤 James H. Rea
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:46
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08L23/18; C08L23/20; C08L23/22; C08L2205/00; C08L2205/03; C08L23/08; C08L23/0846; C08L23/0869; C08L2310/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
141 words
A compatible blend of polymers consisting essentially of: (a) A low density ethylene polymer, (b) An ethylene copolymer, and (c) A solid amorphous isobutylene polymer; said low density ethylene polymer having a density of less than about 0.945 and a melt index of about 0.5-20; said ethylene copolymer having polymerized therein about 70 to 98 weight % of ethylene and the balance an alkyl ester of acrylic or methacrylic acid; said isobutylene polymer having a molecular weight of at least about 10,000; said ethylene copolymer being present in an amount constituting about 15-50 weight % of the total weight of the low density ethylene polymer and the ethylene copolymer; and said isobutylene polymer being present in the amount of said 15-75 parts by weight for each 100 parts of combined weight of the low density ethylene polymer and the ethylene copolymer.
Claim 2
Dependent Claim
141 words
A compatible blend of polymers consisting essentially of: (a) A low density ethylene polymer, (b) An ethylene copolymer, and (c) A solid amorphous isobutylene polymer; said low density ethylene polymer having a density of less than about 0.945 and a melt index of about 0.5-20; said ethylene copolymer having polymerized therein about 70 to 98 weight % of ethylene and the balance an alkyl ester of acrylic or methacrylic acid; said isobutylene polymer having a molecular weight of at least about 10,000; said ethylene copolymer being present in an amount constituting about 15-50 weight % of the total weight of the low density ethylene polymer and the ethylene copolymer; and said isobutylene polymer being present in the amount of said 15-75 parts by weight for each 100 parts of combined weight of the low density ethylene polymer and the ethylene copolymer.
Claim 3
Dependent Claim
49 words
A composition of claim 1 in which the ethylene copolymer is a copolymer of ethylene and methyl acrylate and the methyl acrylate content thereof is such that it constitutes about 4-10 weight % of the combined total weight of the low density ethylene polymer and the ethylene-methyl acrylate copolymer.
Claim 4
Dependent Claim
38 words
A composition of claim 1 in which the isobutylene polymer is present in the amount of about 20-67 parts by weight for each 100 parts of combined weight of the low density ethylene polymer and the ethylene copolymer.
Claim 5
Dependent Claim
20 words
A composition of claim 1, 2, or 3 in which the isobutylene polymer has a molecular weight of about 60,000-135,000.
Claim 6
Dependent Claim
8 words
A film of a composition of claim 1.
Claim 7
Dependent Claim
8 words
A film of a composition of claim 2.
Claim 8
Dependent Claim
8 words
A film of a composition of claim 3.
Claim 9
Dependent Claim
22 words
A film of claim 5, 6 or 7 in which the isobutylene polymer contained therein has a molecular weight of about 60,000-135,000.
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) | 1984-06-15 | 1984-12-15 | 1985-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-15 | 1988-12-15 | 1989-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-15 | 1992-12-15 | 1993-06-16 | $7700.00 | Window Closed / Lapsed |