US4579781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Material for packaging light-sensitive materials
Assignee: Fujifilm Holdings Corp
•
Filing: 1983-04-06
•
Granted: 1986-04-01
•
Expires: 2003-04-06
Abstract
Abstract A light-shielding paper consists of a laminate comprising a substrate, a polyethylene polymer layer comprising 50-100% by weight of L-LDPE and being substantially free from light-shielding material, the laminate as a whole containing light-shielding material, and a protective layer on the side opposite to the polyethylene polymer layer.
Inventors
- 👤 Mutsuo Akao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:04
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/10; B32B27/322; B32B7/00; B32B7/04; B32B7/12; G; G03; G03C; G03C3/00; B32B2264/00; B32B2264/10; B32B2264/107; B32B2264/108; B32B2307/00; B32B2307/40; B32B2323/00; B32B2323/04; B32B2323/046; B32B2553/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
94 words
A material for packaging light-sensitive materials consisting of a laminate comprising a substrate, a polyethylene polymer layer which is non-adhesive under ambient conditions and which is directly or indirectly attached to the substrate comprising not less than 50% by weight of linear low density polyethylene (L-LDPE) which is a copolymer of ethylene and an α-olefin of 3 to 13 carbon atoms on a linear chain, and containing substantially no light-shielding material, said laminate further comprising light-shielding material outside of said polyethylene polymer layer in an amount sufficient to provide light-shielding properties to the laminate.
Claim 2
Dependent Claim
94 words
A material for packaging light-sensitive materials consisting of a laminate comprising a substrate, a polyethylene polymer layer which is non-adhesive under ambient conditions and which is directly or indirectly attached to the substrate comprising not less than 50% by weight of linear low density polyethylene (L-LDPE) which is a copolymer of ethylene and an α-olefin of 3 to 13 carbon atoms on a linear chain, and containing substantially no light-shielding material, said laminate further comprising light-shielding material outside of said polyethylene polymer layer in an amount sufficient to provide light-shielding properties to the laminate.
Claim 3
Dependent Claim
17 words
A material as defined in claim 1, wherein the L-LDPE comprises 80 to 99.5 mol % ethylene.
Claim 4
Dependent Claim
16 words
A material as defined in claim 1, wherein the α-olefin has 4 to 10 carbon atoms.
Claim 5
Dependent Claim
26 words
A material as defined in claim 1, wherein the α-olefin is one selected from the group consisting of 1-butene, 1-octene, 1-hexene, 4-methyl-1-pentene and a mixture thereof.
Claim 6
Dependent Claim
17 words
A material as defined in claim 1, wherein the α-olefin is 4-methyl-1-pentene, 1-hexene or a mixture thereof.
Claim 7
Dependent Claim
17 words
A material as defined in claim 2, wherein the L-LDPE comprises 90 to 99.5 mol % ethylene.
Claim 8
Dependent Claim
22 words
A material as defined in claim 1, wherein the L-LDPE has a melt index (M.I. at 190° C.) of 0.2 to 25.
Claim 9
Dependent Claim
17 words
A material as defined in claim 7, wherein the L-LDPE has a M.I. of 0.4 to 15.
Claim 10
Dependent Claim
20 words
A material as defined in claim 1, wherein the L-LDPE has a density of 0.91 to 0.95 g/cm 3 .
Claim 11
Dependent Claim
17 words
A material as defined in claim 2, wherein said polyethylene polymer layer substantially consists of polyethylene polymer.
Claim 12
Dependent Claim
46 words
A material as defined in claim 10, wherein said polyethylene polymer of said polyethylene polymer layer essentially consists of 50-100% by weight of L-LDPE with the balance being selected from the group consisting of high pressure process polyethylene (LDPE), other polyolefin copolymer or a mixture thereof.
Claim 13
Dependent Claim
33 words
A material as defined in claim 11, wherein said other polyolefin copolymer is one selected from the group consisting of ethylene-vinyl acetate, propylene-ethylene, ethylene-acrylic acid, ethylene-ethylacrylate, ionomer, vinyl chloride-propylene and a mixture thereof.
Claim 14
Dependent Claim
26 words
A material as defined in claim 1, wherein said polyethylene polymer layer comprises less than 1% by weight of light-shielding material based on the polyethylene polymer.
Claim 15
Dependent Claim
16 words
A material as defined in claim 1, wherein said polyethylene polymer layer comprises no light-shielding material.
Claim 16
Dependent Claim
31 words
A material as defined in claim 1, wherein light-shielding material is one or more selected from the group consisting of particulated material, metallic foil, deposited metal film or a combination thereof.
Claim 17
Dependent Claim
23 words
A material as defined in claim 15, wherein the light-shielding material is carbon black, aluminum foil, deposited aluminum film or a combination thereof.
Claim 18
Dependent Claim
14 words
A material as defined in claim 1, wherein the substrate is a flexible sheet.
Claim 19
Dependent Claim
12 words
A material as defined in claim 17, wherein flexible sheet is paper.
Claim 20
Dependent Claim
16 words
A material as defined in claim 1, wherein the laminate further comprises an outer protective layer.
Claim 21
Dependent Claim
25 words
A material as defined in claim 19, wherein the protective layer is provided on a side of the laminate opposite to the polyethylene polymer layer.
Claim 22
Dependent Claim
20 words
A material as defined in claim 1, wherein the polyethylene polymer layer forms at least one surface of the laminate.
Claim 23
Dependent Claim
33 words
A material as defined in claim 1, wherein the laminate comprises a substrate, a polyethylene polymer on one side of the substrate and a protective layer on the other side of the substrate.
Claim 24
Dependent Claim
41 words
A material as defined in claim 1, wherein the laminate comprises a substrate containing carbon black, a polyethylene polymer layer on a side of the substrate, an adhesive layer therebetween, and a protective layer on the other side of the substrate.
Claim 25
Dependent Claim
57 words
A material as defined in claim 1, wherein the laminate comprises a substrate, an adhesive layer on one side of the substrate an aluminum foil on the adhesive layer, a second adhesive layer on the aluminum foil, a polyethylene polymer layer on the second adhesive layer, and a protective layer on the other side of the substrate.
Claim 26
Dependent Claim
52 words
A material as defined in claim 1, wherein the laminate comprises a substrate containing light-shielding material. an adhesive layer on one side of the substrate, a deposited aluminum layer on the adhesive layer, a polyethylene polymer layer on the aluminum layer, and a protective layer on the other side of the substrate.
Claim 27
Dependent Claim
46 words
A material as defined in claim 1, wherein the laminate comprises a substrate, a polyethylene polymer layer on one side thereof, an adhesive layer on the other side of the substrate, an aluminum layer on the adhesive layer, and a protective layer on the aluminum layer.
Claim 28
Dependent Claim
20 words
A material as defined in any of claims 23-26, wherein said adhesive layer is LDPE, L-LDPE or a blend thereof.
Claim 29
Dependent Claim
14 words
A material as defined in any of claims 23-26, wherein the substrate is paper.
Claim 30
Dependent Claim
16 words
A material as defined in any of claims 22-26 wherein the light-shielding material comprises carbon black.
Claim 31
Dependent Claim
19 words
A material as defined in claim 1, wherein said polyethylene polymer layer is a surface layer of the laminate.
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) | 1989-03-31 | 1989-09-30 | 1990-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-31 | 1993-09-30 | 1994-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-31 | 1997-09-30 | 1998-04-01 | $7700.00 | Window Closed / Lapsed |