US4119479A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for manufacture of laminates which are useful as packaging materials
Assignee: Eastman Kodak Co
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Filing: 1977-06-23
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Granted: 1978-10-10
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Expires: 1997-06-23
Abstract
Abstract Heat-sealable laminates useful as packaging materials, for example, for the packaging of photographic processing chemicals, are comprised of a metal foil, a thermoplastic polymeric film, and an interlayer formed by radiation curing of a composition comprising an acrylated epoxy resin. The laminates are manufactured by a process which comprises forming a sandwich comprising a layer of metal foil, a layer of thermoplastic polymer and an interlayer formed from a composition comprising an acrylated epoxy resin and irradiating the interlayer through the layer of thermoplastic polymer, for example by the use of ultraviolet radiation or high energy ionizing radiation, to cure the interlayer and bond it to both the layer of metal foil and the layer of thermoplastic polymer.
Inventors
- 👤 Robert Franklin Williams, Jr.
- 👤 Chen-i Lu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:18
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; B32B15/043; B32B15/12; B32B15/20; B32B27/00; B32B27/30; B32B27/304; B32B27/306; B32B27/32; B32B38/00; B32B38/0008; B32B7/00; B32B7/04; B32B7/10; G; G03; G03C; G03C5/00; G03C5/26; G03C5/264; G03C5/267; B32B2038/0052; B32B2038/0076; B32B2305/00; B32B2305/72; B32B2307/00; B32B2307/30; B32B2307/31; B32B2310/00; B32B2310/08; B32B2310/0806; B32B2310/0831; B32B2439/00; B32B2553/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31529; Y10T428/31536; Y10T428/31678; Y10T428/31692; Y10T428/31699; Y10T428/31703; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31928
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
106 words
A method of making a heat-sealable laminate which comprises: (1) forming a sandwhich comprising (a) a layer of metal foil, (b) a layer of thermoplastic polymer, and (c) an interlayer between said layer of metal foil and said layer of thermoplastic polymer composed of a radiation-curable composition comprising an acrylic monomer and an acrylated epoxy resin of the formula: ##STR3## wherein R is a hydrogen atom or a methyl group and n is 1 to 20, and (2) irradiating said interlayer through said layer of thermoplastic polymer to cure said interlayer and bond it to said layer of metal foil and said layer of thermoplastic polymer.
Claim 2
Independent Claim
106 words
A method of making a heat-sealable laminate which comprises: (1) forming a sandwhich comprising (a) a layer of metal foil, (b) a layer of thermoplastic polymer, and (c) an interlayer between said layer of metal foil and said layer of thermoplastic polymer composed of a radiation-curable composition comprising an acrylic monomer and an acrylated epoxy resin of the formula: ##STR3## wherein R is a hydrogen atom or a methyl group and n is 1 to 20, and (2) irradiating said interlayer through said layer of thermoplastic polymer to cure said interlayer and bond it to said layer of metal foil and said layer of thermoplastic polymer.
Claim 3
Dependent Claim
19 words
A method as claimed in claim 1 wherein said interlayer is cured by exposure to high energy ionizing radiation.
Claim 4
Dependent Claim
23 words
A method as claimed in claim 2 wherein the total dosage is in the range of from about 0.5 to about 20 megarads.
Claim 5
Dependent Claim
25 words
A method as claimed in claim 1 wherein said radiation-curable composition additionally comprises a photoinitiator and said interlayer is cured by exposure to ultraviolet radiation.
Claim 6
Dependent Claim
34 words
A method as claimed in claim 1 wherein said radiation-curable composition comprises said acrylated epoxy resin, a monofunctional acrylic monomer and a member selected from the group consisting of polyfunctional acrylates and polyfunctional methacrylates.
Claim 7
Dependent Claim
47 words
A method as claimed in claim 1 wherein said metal foil is lead foil,, said thermoplastic polymer is polypropylene, and said radiation-curable composition is comprised of butyl acrylate, neopentylglycol diacrylate, and an acrylated epoxy resin of the formula: ##STR4## wherein n has a value of about 13.
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) | 1981-10-09 | 1982-04-10 | 1982-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-09 | 1986-04-10 | 1986-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-09 | 1990-04-10 | 1990-10-10 | $7700.00 | Window Closed / Lapsed |