US4576865A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Materials for packaging light-sensitive materials
Assignee: Fujifilm Holdings Corp
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Filing: 1983-10-12
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Granted: 1986-03-18
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Expires: 2003-10-12
Abstract
Abstract A material for packaging light-sensitive materials including a composite sheet (laminate) of a substrate and a thermoplastic resin layer, a layer of said sheet including light-shielding materials, wherein said thermoplastic resin layer includes a surface layer and an intermediate layer which are melt-coextruded, said surface layer being comprised of thermoplastic resin of polyolefins or ethylene copolymer containing substantially no less than 95 mol % of ethylene, said intermediate layer being comprised of one or more copolymers selected from: (a) a copolymer including 7-30 mol % of acrylic ester and/or methacrylic ester with the balance being ethylene provided that the ester is comprised of an alkyl group having 1-8 carbon atoms, and (b) a copolymer (EVA) including 7-20 mol % of vinyl acetate with the balance being ethylene.
Inventors
- 👤 Mutsuo Akao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:22
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/10; B32B27/30; B32B27/306; B32B27/32; B32B29/00; B32B29/002; B65; B65D; B65D65/00; B65D65/02; B65D65/16; B32B2307/00; B32B2307/20; B32B2307/21; B32B2307/30; B32B2307/31; B32B2307/50; B32B2307/558; B32B2307/58; B32B2307/581; B32B2307/582; B32B2307/5825; B32B2553/00; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31906; Y10T428/31909; Y10T428/31913; Y10T428/31928; Y10T428/31935
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
176 words
A material for packaging light-sensitive materials including a composite sheet which is a laminate of a substrate and at least one thermoplastic resin layer, at least one layer of said sheet having light-shielding properties, wherein said thermoplastic resin layer is prepared by the process of melt coextruding a surface layer and an intermediate layer; said surface layer being comprised of thermoplastic polyolefin resin selected from the group consisting of low density polyethylene, medium density polyethylene, high density polyethylene, linear low density (L-LDPE), ethylene copolymer other than L-LDPE which contain no less than 95 mol % of ethylene, polypropylene and mixtures thereof, said intermediate layer having a thickness of at least 4 microns and being heat sealable and being comprised of one or more copolymers selected from: (a) copolymer including 7-30 mol % acrylic ester and/or methacrylic ester with the balance being ethylene provided that the ester is comprised of an alkyl group having 1-8 carbon atoms, and (b) an ethylene vinyl acetate copolymer (EVA) including 7-20 mol % of vinyl acetate with the balance being ethylene.
Claim 2
Dependent Claim
176 words
A material for packaging light-sensitive materials including a composite sheet which is a laminate of a substrate and at least one thermoplastic resin layer, at least one layer of said sheet having light-shielding properties, wherein said thermoplastic resin layer is prepared by the process of melt coextruding a surface layer and an intermediate layer; said surface layer being comprised of thermoplastic polyolefin resin selected from the group consisting of low density polyethylene, medium density polyethylene, high density polyethylene, linear low density (L-LDPE), ethylene copolymer other than L-LDPE which contain no less than 95 mol % of ethylene, polypropylene and mixtures thereof, said intermediate layer having a thickness of at least 4 microns and being heat sealable and being comprised of one or more copolymers selected from: (a) copolymer including 7-30 mol % acrylic ester and/or methacrylic ester with the balance being ethylene provided that the ester is comprised of an alkyl group having 1-8 carbon atoms, and (b) an ethylene vinyl acetate copolymer (EVA) including 7-20 mol % of vinyl acetate with the balance being ethylene.
Claim 3
Dependent Claim
17 words
A material as defined in claim 1, wherein said surface layer has a thickness of 0.3-5 microns.
Claim 4
Dependent Claim
17 words
A material as defined in claim 1, wherein said intermediate layer has a thickness of 4-70 microns.
Claim 5
Dependent Claim
24 words
A material as defined in claim 1, wherein said coextruded layer including said surface and intermediate layers has a total thickness of 9-75 microns.
Claim 6
Dependent Claim
43 words
A material as defined in claim 1, wherein said intermediate layer is comprised of EVA containing 10-20 mol % of vinyl acetate, a copolymer of ethylene-acrylic ester or a copolymer of ethylene-methacrylic ester provided that said copolymers contain 10-20 mol % of ester.
Claim 7
Dependent Claim
21 words
A material as defined in claim 5, wherein said surface layer of polyolefin thermoplastic resin has a thickness of 0.3-2 microns.
Claim 8
Dependent Claim
28 words
A material as defined in claim 6, wherein said surface layer is comprised of high density polyethylene having a density of not less than 0.95 g/cm 3 .
Claim 9
Dependent Claim
14 words
A material as defined in claim 5 or 6, wherein the substrate includes paper.
Claim 10
Dependent Claim
24 words
A material as defined in claim 1, wherein one or more layers of the composite sheet contain 1-20 wt % of the light-shielding material.
Claim 11
Dependent Claim
24 words
A material as defined in claim 9, wherein one or more layers of the composite sheet contain 3-10 wt % of the light-shielding material.
Claim 12
Dependent Claim
16 words
A material as defined in claim 9 or 10, wherein the light-shielding material is carbon black.
Claim 13
Dependent Claim
20 words
A material as defined in claim 1, wherein said substrate includes a thermoplastic resin film which is stretched or molecular-oriented.
Claim 14
Dependent Claim
30 words
A material as defined in claim 12, wherein the substrate includes laminate of two or more uniaxial stretched films with a cross angle of the stretching axes of 45-90 degrees.
Claim 15
Dependent Claim
34 words
A material as defined in claim 1, wherein the surface layer is an ethylene copolymer selected from the group consisting of ethylene vinyl acetate copolymer, ethylene-acrylic ester copolymer, ethylene-methacrylic ester copolymer and mixtures thereof.
Claim 16
Dependent Claim
46 words
A material as defined in claim 1, wherein the surface layer is comprised of a blend containing 95 mol % or more of ethylene and at least one polymer selected from the group consisting of ethylene vinyl acetate copolymer, ethylene-acrylic ester copolymer and ethylene-methacrylic ester copolymer.
Claim 17
Dependent Claim
30 words
A material as defined in claim 1, wherein the intermediate layer is comprised of a blend of said polyolefins and EVA, the blend including 7-20 mol % of vinyl acetate.
Claim 18
Dependent Claim
35 words
A material as defined in claim 1, wherein the intermediate layer is comprised of a blend of said polyolefins with ethylene-acrylic ester copolymer and/or ethylene-methacrylic ester copolymer, the blend including 7-30 mol % of ester.
Claim 19
Dependent Claim
34 words
A material as defined in claim 1, wherein said ester is of one or more selected from the group consisting of methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethyl-butyl acrylate, ethyl methacrylate and butyl methacrylate.
Claim 20
Dependent Claim
38 words
A material as defined in claim 1, wherein said intermediate layer comprises a minor amount of one or more known additives selected from the group consisting of light-shielding materials, antistatic agents, lubricants, fillers, slip agents and antioxidizing agents.
Claim 21
Dependent Claim
15 words
A material as defined in claim 2, wherein said surface layer is 1-3 microns thick.
Claim 22
Dependent Claim
15 words
A material as defined in claim 3, wherein said intermediate layer is 10-30 microns thick.
Claim 23
Dependent Claim
21 words
A material as defined in claim 4, wherein the total thickness of said surface and intermediate layers is 13-32 microns thick.
References Cited (Backward Citations)
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US4337285A
Cited
US4363841A
Cited
US4452846A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-17 | 1989-09-16 | 1990-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-17 | 1993-09-16 | 1994-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-17 | 1997-09-16 | 1998-03-18 | $7700.00 | Window Closed / Lapsed |