US4513050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Material for packaging light-sensitive materials
Assignee: Fujifilm Holdings Corp
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Filing: 1983-04-22
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Granted: 1985-04-23
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Expires: 2003-04-22
Abstract
Abstract A material for packaging light-sensitive materials composed of a composite sheet comprising a substrate coated with a middle layer(s) and a surface layer(s) is manufactured through melt co-extrusion, said surface layer(s) being of thermoplastic resins which have excellent heat seal properties yet have great neck-in, said middle layer(s) being of thermoplastic resins having small neck-in and excellent adhesion to a substrate, and any of layers of said composite sheet containing light-shielding material.
Inventors
- 👤 Mutsuo Akao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:49
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B15/00; B32B15/20; B32B27/322; B32B5/00; B32B5/16; G; G03; G03C; G03C3/00; B32B2264/00; B32B2264/10; B32B2264/107; B32B2264/108; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/40; B32B2553/00; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10S428/913; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24843; Y10T428/24851; Y10T428/24893; Y10T428/24901; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/30; Y10T428/31504; Y10T428/31678; Y10T428/31681; Y10T428/31692; Y10T428/31699; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31928
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
171 words
A material for packaging light-sensitive materials composed of a composite sheet comprising a substrate coated with at least a middle layer and at least a surface layer through melt co-extrusion, said surface layer being of thermoplastic resin which is heat sealable and yet has larger neck-in and which is selected from the group consisting of ethylene-vinyl acetate copolymer containing not more than 93 wt % ethylene, ethylene-acrylate copolymer containing not more than 93 wt % ethylene, ethylene-methacrylate copolymer containing not more than 93 wt % ethylene, linear low-density polyethylene, ionomer and mixtures thereof, said middle layer being of thermoplastic resin having small neck-in and good adhesion to the substrate and which is selected from the group consisting of low-density polyethylene, moderate-density polyethylene, high-density polyethylene, polypropylene, ethylene-acrylate copolymer containing not less than 95 wt % ethylene, ethylene-methacrylate copolymer containing not less than 95 wt % ethylene, ethylene-vinyl acetate copolymer containing not less than 95 wt % ethylene and mixtures thereof, and one or more layers of said composite sheet containing light-shielding material.
Claim 2
Dependent Claim
171 words
A material for packaging light-sensitive materials composed of a composite sheet comprising a substrate coated with at least a middle layer and at least a surface layer through melt co-extrusion, said surface layer being of thermoplastic resin which is heat sealable and yet has larger neck-in and which is selected from the group consisting of ethylene-vinyl acetate copolymer containing not more than 93 wt % ethylene, ethylene-acrylate copolymer containing not more than 93 wt % ethylene, ethylene-methacrylate copolymer containing not more than 93 wt % ethylene, linear low-density polyethylene, ionomer and mixtures thereof, said middle layer being of thermoplastic resin having small neck-in and good adhesion to the substrate and which is selected from the group consisting of low-density polyethylene, moderate-density polyethylene, high-density polyethylene, polypropylene, ethylene-acrylate copolymer containing not less than 95 wt % ethylene, ethylene-methacrylate copolymer containing not less than 95 wt % ethylene, ethylene-vinyl acetate copolymer containing not less than 95 wt % ethylene and mixtures thereof, and one or more layers of said composite sheet containing light-shielding material.
Claim 3
Dependent Claim
14 words
A material as defined in claim 1, wherein said ethylene-acrylate copolymer is ethylene-alkylacrylate copolymer.
Claim 4
Dependent Claim
20 words
A material as defined in claim 2, wherein said ethylene-alkylacrylate copolymer is ethylene-ethylacrylate copolymer, ethylene-methacrylate copolymer or a mixture thereof.
Claim 5
Dependent Claim
14 words
A material as defined in claim 1, wherein said substrate is a flexible sheet.
Claim 6
Dependent Claim
17 words
A material as defined in claim 1, wherein said surface layer is thinner than said middle layer.
Claim 7
Dependent Claim
25 words
A material as defined in claim 1, wherein said surface layer and said middle layer in total are about 7 to about 100 microns thick.
Claim 8
Dependent Claim
18 words
A material as defined in claim 6, wherein said surface layer approximately ranges from 1 to 30 mirons.
Claim 9
Dependent Claim
25 words
A material as defined in claim 5, wherein the thickness ratio of said surface layer to said middle layer approximately ranges from 1:1.2 to 1:25.
Claim 10
Dependent Claim
30 words
A material as defined in claim 1, wherein the light-shielding material is contained in a powdery form dispersed in said composite sheet, a layer form, or a combination form thereof.
Claim 11
Dependent Claim
18 words
A material as defined in claim 9, wherein the light-shielding material comprises aluminum foil or aluminum deposited layer.
Claim 12
Dependent Claim
14 words
A material as defined in claim 9, wherein said light-shielding material comprises carbon black.
Claim 13
Dependent Claim
31 words
A material as defined in claim 9, wherein said substrate comprises the light-shielding material of the layer form onto which said middle layer and surface layer are melt co-extruded and laminated.
Claim 14
Dependent Claim
30 words
A material as defined in claim 1, wherein said ethylene-vinyl acetate copolymer ethylene-acrylate copolymer ethylene-acrylate alkyl ester copolymer and ethylene-methacrylate copolymer of said surface layer comprise 75-90 wt % ethylene.
Claim 15
Dependent Claim
26 words
A material as defined in claim 1, wherein said middle layer and surface layer are formed either on one side or both sides of the substrate.
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) | 1988-04-22 | 1988-10-22 | 1989-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-22 | 1992-10-22 | 1993-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-22 | 1996-10-22 | 1997-04-23 | $7700.00 | Window Closed / Lapsed |