US4218510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self unified, heat sealable, multilayer film
Assignee: 3M Co
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Filing: 1979-01-02
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Granted: 1980-08-19
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Expires: 1999-01-02
Abstract
Abstract A self unified, heat sealable, multilayer film comprising a polyester layer chemically interfacially bonded to a polyolefinic layer containing from about 250 to 750 parts per million of a fatty acid amide, wherein the interfacial bond between said polyester layer and said polyolefinic layer is so strong that said layers cannot be mechanically separated.
Inventors
- 👤 Karl S. Willson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:11
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/36; B32B27/32; C; C08; C08K; C08K5/00; C08K5/16; C08K5/20; C09; C09J; C09J7/00; C09J7/20; C09J7/22; C09J7/30; C09J7/35; B32B2307/00; B32B2307/30; B32B2307/31; B32B2323/00; B32B2323/04; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/2852; Y10T428/2878; Y10T428/31504; Y10T428/31536; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/31938
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
103 words
A self-unified, heat-sealable, multilayer film structure comprising two organic film layers chemically interfacially bonded to one another, the interfacial bond being so strong that said layers cannot be mechanically separated, said organic film layers comprising a layer of biaxially oriented and heat-set polyester film and a layer of polyolefinic film having a density of less than about 0.94 g/cm 3 and being transmissive to ultraviolet radiation, said polyolefinic film being selected from polyethylene and copolymers of ethylene, and said layer of polyolefinic film containing from about 250 to 750 parts per million of a fatty acid amide containing at least 8 carbon atoms.
Claim 2
Dependent Claim
103 words
A self-unified, heat-sealable, multilayer film structure comprising two organic film layers chemically interfacially bonded to one another, the interfacial bond being so strong that said layers cannot be mechanically separated, said organic film layers comprising a layer of biaxially oriented and heat-set polyester film and a layer of polyolefinic film having a density of less than about 0.94 g/cm 3 and being transmissive to ultraviolet radiation, said polyolefinic film being selected from polyethylene and copolymers of ethylene, and said layer of polyolefinic film containing from about 250 to 750 parts per million of a fatty acid amide containing at least 8 carbon atoms.
Claim 3
Dependent Claim
21 words
A self-unified, heat-sealable multilayer film structure according to claim 1 wherein said fatty acid amide is an unsaturated fatty acid amide.
Claim 4
Dependent Claim
22 words
A self-unified, heat-sealable multilayer film structure according to claim 2 wherein said unsaturated fatty acid amide is selected from oleamide and erucamide.
Claim 5
Dependent Claim
18 words
A self-unified, heat-sealable multilayer film structure according to claim 3 wherein said unsaturated fatty acid amide is erucamide.
Claim 6
Dependent Claim
17 words
A self-unified, heat-sealable multilayer film structure according to claim 3 wherein said unsaturated fatty acid is oleamide.
Claim 7
Dependent Claim
17 words
A self-unified, heat-sealable multilayer film structure according to claim 1 wherein said fatty acid amide is saturated.
Claim 8
Dependent Claim
18 words
A self-unified, heat-sealable multilayer film structure according to claim 6 wherein said saturated fatty acid amide is stearamide.
Claim 9
Dependent Claim
16 words
A self-unified, heat-sealable multilayer film structure according to claim 1 wherein said polyolefinic film is polyethylene.
Claim 10
Dependent Claim
19 words
A self-unified, heat-sealable multilayer film structure according to claim 1 wherein said polyolefinic film is a copolymer of ethylene.
Claim 11
Dependent Claim
38 words
A self-unified, heat-sealable multilayer film structure according to claim 9 wherein said copolymer of ethylene is selected from copolymers of ethylene and (1) acrylic acid, (2) ethyl acrylate, (3) vinyl acetate and (4) methacrylic acid and vinyl acetate.
Claim 12
Dependent Claim
39 words
A self-unified, heat-sealable multilayer film structure according to claim 1 wherein said polyolefinic layer comprises (i) polyethylene having a density of less than about 0.94 g/cm 3 and (ii) from about 250 to 500 parts per million of erucamide.
Claim 13
Dependent Claim
24 words
A self-unified, heat-sealable multilayer film structure according to claim 11 wherein said polyethylene has a density of less than about 0.925 g/cm 3 .
Claim 14
Dependent Claim
18 words
A self-unified, heat-sealable multilayer film structure according to claim 12 containing about 400 parts per million of erucamide.
Claim 15
Dependent Claim
113 words
A self-unified, heat-sealable, multilayer film structure comprising a layer of biaxially oriented and heat-set polyester film, a first and a second layer of polyolefinic film chemically interfacially bonded to opposite sides of said layer of polyester film, the interfacial bond being so strong that said layers cannot be mechanically separated, wherein said first and second layers of polyolefinic film have a density of less than about 0.94 g/cm 3 , are transmissive to ultraviolet radiation and are selected from polyethylene and copolymers of ethylene, and wherein said first layer of polyolefinic film further contains from about 250 to 750 parts per million of a fatty acid amide containing at least 8 carbon atoms.
Claim 16
Dependent Claim
113 words
A self-unified, heat-sealable, multilayer film structure comprising a layer of biaxially oriented and heat-set polyester film, a first and a second layer of polyolefinic film chemically interfacially bonded to opposite sides of said layer of polyester film, the interfacial bond being so strong that said layers cannot be mechanically separated, wherein said first and second layers of polyolefinic film have a density of less than about 0.94 g/cm 3 , are transmissive to ultraviolet radiation and are selected from polyethylene and copolymers of ethylene, and wherein said first layer of polyolefinic film further contains from about 250 to 750 parts per million of a fatty acid amide containing at least 8 carbon atoms.
Claim 17
Dependent Claim
30 words
A self-unified, heat-sealable, multilayer film structure according to claim 14 wherein said first layer of polyolefinic film comprises polyethylene having a density of less than about 0.925 g/cm 3 .
Claim 18
Dependent Claim
33 words
A self-unified, heat-sealable multilayer film structure according to claim 15 wherein said second layer of polyolefinic film comprises polyethylene having a density in the range of about 0.925 to 0.94 g/cm 3 .
Claim 19
Dependent Claim
30 words
A self-unified, heat-sealable multilayer film structure according to claim 16 wherein said first layer of polyolefinic film contains from about 250 to 500 parts per million of fatty acid amide.
Claim 20
Dependent Claim
17 words
A self-unified, heat-sealable multilayer film structure according to claim 17 wherein said fatty acid amide is unsaturated.
Claim 21
Dependent Claim
22 words
A self-unified, heat-sealable multilayer film structure according to claim 18 wherein said unsaturated fatty acid amide is selected from oleamide and erucamide.
Claim 22
Dependent Claim
18 words
A self-unified, heat-sealable multilayer film structure according to claim 19 wherein said unsaturated fatty acid amide is erucamide.
Claim 23
Dependent Claim
18 words
A self-unified, heat-sealable multilayer film structure according to claim 19 wherein said unsaturated fatty acid amide is oleamide.
Claim 24
Dependent Claim
18 words
A self-unified, heat-sealable multilayer film structure according to claim 20 containing about 400 parts per million of erucamide.
Claim 25
Dependent Claim
23 words
A self-unified, heat-sealable multilayer film structure according to claim 22 wherein said second layer of polyolefinic film is free from fatty acid amide.
Claim 26
Dependent Claim
17 words
A self-unified, heat-sealable multilayer film structure according to claim 17 wherein said fatty acid amide is saturated.
Claim 27
Dependent Claim
17 words
A self-unified, heat-sealable multilayer film structure according to claim 24 wherein said saturated fatty acid is stearamide.
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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) | 1983-08-19 | 1984-02-18 | 1984-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-19 | 1988-02-18 | 1988-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-19 | 1992-02-18 | 1992-08-19 | $7700.00 | Window Closed / Lapsed |