US4663218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Packaging film for photosensitive materials for photographic purpose
Assignee: Fujifilm Holdings Corp
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Filing: 1985-08-26
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Granted: 1987-05-05
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Expires: 2005-08-26
Abstract
Abstract A packaging film for photosensitive materials for photographic purposes which is a laminated film containing at least a metallized film layer and two polyethylene polymer layers which are located on both sides of the metallized film layer, at least one of the above polyethylene polymer layers contains more than 50 wt % of linear low density polyethylene manufactured by a low pressure method, and side or both of the above polyethylene polymer layers contains 0.3 to 30 wt % of a light-shielding material, and the strength of one or both sides of the above polyethylene polymer layers is stronger than the adhesive force between the above metallized film and the difference in the thickness of the polyethylene polymer layers is smaller than 50%. This film is superior in physical strength, moisture proofing, gas barrier, light-shielding and antistatic character, and it is superior as a packaging film for a photosensitive material for photographic purpose.
Inventors
- 👤 Mutsuo Akao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:44
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B15/00; B32B15/04; B32B15/08; B32B15/20; B32B27/18; B32B27/32; G; G03; G03C; G03C3/00; B32B2255/00; B32B2255/10; B32B2255/20; B32B2255/205; B32B2307/00; B32B2307/20; B32B2307/21; B32B2307/50; B32B2307/558; B32B2307/582; B32B2307/5825; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2307/726; B32B2307/7265; B32B2323/00; B32B2323/04; B32B2323/046; B32B2323/10; B32B2439/00; B32B2439/02; B32B2439/06; B32B2553/00; Y; Y10; Y10S; Y10S430/00; Y10S430/162; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/1338; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24992; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31855; Y10T428/31938
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
122 words
A film for packaging a photosensitive material which is a laminated film containing at least a metallized film layer and two polyethylene polymer layers which are located on both sides of said metallized film layer, (a) at least one of said polyethylene polymer layers contains more than 50 wt% of linear low density polyethylene manufactured by a low pressure method, (b) at least one of the polyethylene polymer layers contains 0.3 to 30 wt% of a light-shielding material, and (c) the strength of at least one of the polyethylene polymer layers is stronger than the adhesive force between the polyethylene polymer layer and said metallized film layer and the difference in the thickness of the polyethylene polymer layers is less than 50%.
Claim 2
Dependent Claim
122 words
A film for packaging a photosensitive material which is a laminated film containing at least a metallized film layer and two polyethylene polymer layers which are located on both sides of said metallized film layer, (a) at least one of said polyethylene polymer layers contains more than 50 wt% of linear low density polyethylene manufactured by a low pressure method, (b) at least one of the polyethylene polymer layers contains 0.3 to 30 wt% of a light-shielding material, and (c) the strength of at least one of the polyethylene polymer layers is stronger than the adhesive force between the polyethylene polymer layer and said metallized film layer and the difference in the thickness of the polyethylene polymer layers is less than 50%.
Claim 3
Dependent Claim
10 words
The film of claim 1, wherein said metal is aluminum.
Claim 4
Dependent Claim
19 words
The film of claim 1, wherein said polyethylene polymer layer contains low density polyethylene manufactured by high pressure method.
Claim 5
Dependent Claim
12 words
The film of claim 1, wherein said light-shielding material is carbon black.
Claim 6
Dependent Claim
85 words
The film of claim 1, wherein said metallized film layer is a thermoplastic resin film at least one surface of which is coated with a metal by vacuum evaporation, and said thermoplastic resin comprises at least one resin selected from the group consisting of polypropylene, high density polyethylene manufactured by a low pressure method, medium density polyethylene manufactured by a low pressure method, low density polyethylene manufactured by a high pressure method, linear low density polyethylene manufactured by a low pressure method, and a polyamide.
Claim 7
Dependent Claim
13 words
The film of claim 5, wherein said thermoplastic resin is non oriented polypropylene.
Claim 8
Dependent Claim
10 words
The film of claim 5, wherein said metal is aluminum.
Claim 9
Dependent Claim
31 words
The film of claim 1, wherein a comonomer of said linear low density polyethylene manufactured by a low pressure method is an α-olefin having a carbon number of 3 to 13.
Claim 10
Dependent Claim
22 words
The film of claim 8, wherein said comonomer coprises at least one monomer selected from the group consisting of 4-methylpentene-1 and hexene-1.
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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) | 1990-05-04 | 1990-11-03 | 1991-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-04 | 1994-11-03 | 1995-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-04 | 1998-11-03 | 1999-05-05 | $7700.00 | Window Closed / Lapsed |