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US4022850A
Expired / Lapsed
US
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Self-sealing films
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1975-06-13
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Granted: 1977-05-10
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Expires: 1995-06-13
Abstract
Abstract A transparent self-sealing film suitable for packaging is made from a composition comprising (i) 90 to 99.95 wt. % of a copolymer of ethylene and a vinyl (or hydrocarbyl substituted vinyl) ester of a C 1 -C 30 monocarboxylic acid (vinyl acetate) containing at least 89 wt. % (e.g., 91 to 95 wt. %) of ethylene and (ii) either 0.05 to 10 wt. % of a hydrocarbon resin, or 0.05 to 5 wt. % of liquid polyisobutylene or liquid polybutylene (MW 30,000 to 50,000) or a combination of 0.05 to 10 wt. % of the hydrocarbon resin and 0.05 to 5 wt. % of polyisobutylene or polybutylene, provided the combined weight of hydrocarbon resin and polyisobutylene or polybutylene is not more than 10 wt. %.
Inventors
- 👤 David Andrew Booth
- 👤 William James Busby
- 👤 Jean Paul Loree
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:38
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0846; C08L23/0853; C08L2205/00; C08L2205/02; C08L23/18; C08L23/20; C08L23/22; C08L2310/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
151 words
A transparent self-sealing tubular blown, elastic film made from a composition comprising (i) 90 to 99.95 wt. % of a copolymer of ethylene and a vinyl (or hydrocarbyl substituted vinyl) ester of a C 1 -C 30 monocarboxylic acid containing at least 89 wt. % of ethylene and at least 5 wt. % of said vinyl ester wherein said copolymer has a melt index of about 0.2 to about 20 and (ii) either 0.05 to 10 wt. % of a hydrocarbon resin selected from the group consisting of polyterpenes, coumarone-indene resins, and polymers from petroleum distillate fractions, or 0.05 to 5 wt. % of liquid polyisobutylene or liquid polybutylene or a combination of 0.05 to 10 wt. % of the hydrocarbon resin and 0.05 to 5 wt. % of the polyisobutylene or polybutylene, provided the combined weight of hydrocarbon resin and polyisobutylene or polybutylene is not more than 10 wt. %.
Claim 2
Dependent Claim
151 words
A transparent self-sealing tubular blown, elastic film made from a composition comprising (i) 90 to 99.95 wt. % of a copolymer of ethylene and a vinyl (or hydrocarbyl substituted vinyl) ester of a C 1 -C 30 monocarboxylic acid containing at least 89 wt. % of ethylene and at least 5 wt. % of said vinyl ester wherein said copolymer has a melt index of about 0.2 to about 20 and (ii) either 0.05 to 10 wt. % of a hydrocarbon resin selected from the group consisting of polyterpenes, coumarone-indene resins, and polymers from petroleum distillate fractions, or 0.05 to 5 wt. % of liquid polyisobutylene or liquid polybutylene or a combination of 0.05 to 10 wt. % of the hydrocarbon resin and 0.05 to 5 wt. % of the polyisobutylene or polybutylene, provided the combined weight of hydrocarbon resin and polyisobutylene or polybutylene is not more than 10 wt. %.
Claim 3
Dependent Claim
19 words
A film according to claim 1 wherein the vinyl ester from which the copolymer is derived is vinyl acetate.
Claim 4
Dependent Claim
23 words
A film according to claim 1 wherein the hydrocarbon resin is a resin obtained by the polymerization of a cracked petroleum distillate fraction.
Claim 5
Dependent Claim
15 words
A film according to claim 3 wherein the cracked petroleum distillate fraction has been hydrogenated.
Claim 6
Dependent Claim
20 words
A film according to claim 3 wherein said fraction comprises compounds having one or more unsaturated rings in the molecule.
Claim 7
Dependent Claim
30 words
A film according to claim 1 which comprises 96 to 99 wt. % of the ethylene copolymer and 1 to 4 wt. % of the hydrocarbon resin, polyisobutylene or polybutylene.
Claim 8
Dependent Claim
35 words
A film according to claim 1 which comprises 92 to 96 wt. % of ethylene copolymer and 3 to 6 wt. % of hydrocarbon resin plus 1 to 2 wt. % of polyisobutylene or polybutylene.
Claim 9
Dependent Claim
14 words
A film according to claim 1 wherein the copolymer contains from 91 to 95
Claim 10
Dependent Claim
27 words
wt. % of ethylene. 9. A film according to claim 1 wherein the ethylene copolymer has a melt index (as defined in ISO.R92 using a temperature of
Claim 11
Dependent Claim
16 words
190° C. and a load of 2.16 Kg) of 0.2 to 20. 10. A film according
Claim 12
Dependent Claim
16 words
190° C. and a load of 2.16 Kg) of 0.2 to 20. 10. A film according
Claim 13
Dependent Claim
26 words
to claim 9 wherein the melt index is 1.5 to 3.0. 11. A film according to claim 1 wherein the resin is a hydrogenated polycyclopentadiene resin.
Claim 14
Dependent Claim
20 words
A film according to claim 1 wherein the polyisobutylene or polybutylene has a viscosity average MW of 30,000 to 50,000.
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) | 1980-05-09 | 1980-11-08 | 1981-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-09 | 1984-11-08 | 1985-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-09 | 1988-11-08 | 1989-05-10 | $7700.00 | Window Closed / Lapsed |