US4341825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fog-resistant, heat-sealable film
Assignee: 3M Co
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Filing: 1980-02-25
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Granted: 1982-07-27
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Expires: 2000-02-25
Abstract
Abstract A transparent, heat-sealable, laminated film is provided that comprises a first layer of a difficultly heat-sealable polymer chemically interfacially bonded to a second layer of a readily heat-sealable polymer. The second layer contains from about 0.3% to 0.7% by weight of an anti-fogging agent. The film resists the formation of fog when utilized to package refrigerated foods.
Inventors
- 👤 Michael B. Kemski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:44
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/18; B32B7/00; B32B7/04; B32B7/10; C; C09; C09J; C09J7/00; C09J7/20; C09J7/22; C09J7/30; C09J7/35; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/40; B32B2307/412; B32B2367/00; B32B2553/00; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/28; Y10T428/2809; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/2835; Y10T428/31504; Y10T428/31786; Y10T428/31797
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
131 words
A transparent, heat-sealable, laminated film that comprises a first film layer of a difficultly heat-sealable biaxially oriented and heat set saturated polyester, and a second film layer of a readily heat-sealable organic polymer chemically interfacially joined to said first film layer by a bond that is so strong that said layers cannot be mechanically separated from one another, wherein said second film layer comprises a non-linear polyolefin polymer and from about 0.3 to 0.7 percent by weight of an anti-fogging agent which consists essentially of an alkylphenyl polyethylene glycol ether of the formula: ##STR15## wherein R is an alkyl group containing from 10 to 15 carbon atoms, R 1 is an alkylene group containing from about 1 to 3 carbon atoms, and n is an integer of from 4 to 10.
Claim 2
Dependent Claim
131 words
A transparent, heat-sealable, laminated film that comprises a first film layer of a difficultly heat-sealable biaxially oriented and heat set saturated polyester, and a second film layer of a readily heat-sealable organic polymer chemically interfacially joined to said first film layer by a bond that is so strong that said layers cannot be mechanically separated from one another, wherein said second film layer comprises a non-linear polyolefin polymer and from about 0.3 to 0.7 percent by weight of an anti-fogging agent which consists essentially of an alkylphenyl polyethylene glycol ether of the formula: ##STR15## wherein R is an alkyl group containing from 10 to 15 carbon atoms, R 1 is an alkylene group containing from about 1 to 3 carbon atoms, and n is an integer of from 4 to 10.
Claim 3
Dependent Claim
18 words
A package that contains a moisture-producing material, said package comprising a heat-sealed, laminated film according to claim 1.
Claim 4
Dependent Claim
12 words
A film according to claim 1 wherein said polyester is poly(ethylene terephthalate).
Claim 5
Dependent Claim
64 words
A film according to claim 1 wherein said first film layer of biaxially oriented and heat set polyester is poly(ethylene terephthalate), and wherein said second film layer comprises (i) a copolymer of ethylene and vinyl acetate that contains about 28% by weight vinyl acetate units, and (ii) about 0.5% by weight of the reaction product of dodecyl phenol and 6 moles of ethylene oxide.
Claim 6
Dependent Claim
42 words
A film according to claim 1 wherein said polyolefin is selected from (a) polyethylene that has a density of less than about 0.925 g/cm 3 , and (b) copolymers of ethylene and (i) acrylic acid, (ii) ethyl acrylate, and (iii) vinyl acetate.
Claim 7
Dependent Claim
17 words
A film according to claim 5 wherein said polyolefin is a copolymer of ethylene and vinyl acetate.
Claim 8
Dependent Claim
17 words
A film according to claim 6 wherein said copolymer contains about 28% by weight vinyl acetate units.
Claim 9
Dependent Claim
28 words
A film according to claim 1 wherein said alkylphenyl polyethylene glycol ether comprises the reaction product of dodecyl phenol and from 5 to 11 moles of ethylene oxide.
Claim 10
Dependent Claim
25 words
A film according to claim 8 wherein said alkylphenyl polyethylene glycol ether comprises the reaction product of dodecyl phenol and 6 moles of ethylene oxide.
References Cited (Backward Citations)
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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) | 1985-07-26 | 1986-01-25 | 1986-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-26 | 1990-01-25 | 1990-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-26 | 1994-01-25 | 1994-07-27 | $7700.00 | Window Closed / Lapsed |