US4871613A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Packaging material
Assignee: Fujifilm Holdings Corp
•
Filing: 1987-04-06
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Granted: 1989-10-03
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Expires: 2007-04-06
Abstract
Abstract A packaging material which comprises a simultaneously coextruded film comprising a conductive ethylene-ethyl acrylate copolymer resin layer containing more than 50 wt.% of ethylene-ethyl acrylate copolymer resin of which content of ethyl acrylate is more than 6 wt.%, 7 to 20 wt.% of carbon black and 0.01 to 1 wt.% of a lubricant, and a polyolefin resin layer. The packaging material of the invention is superior in antistatic property, moistureproofness, light-shielding, tear strength, impact puncture strength, slipping character and heat sealing properties. Its production is easy because of superior moldability, and generations of blocking, fish eye and pin hole are rare. The packaging material of the invention can be made thinner than the conventional packaging material, and expensive metal foil is not necessary. Accordingly, this packaging material is inexpensive.
Inventors
- 👤 Mutsuo Akao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:36
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/18; B32B27/06; B32B27/08; B32B27/30; B32B27/308; B32B27/32; B32B2307/00; B32B2307/40; B32B2323/00; B32B2323/04; B32B2323/046; B32B2553/00; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/30; Y10T428/31504; Y10T428/31652; Y10T428/31663; Y10T428/31678; Y10T428/31692; Y10T428/31725; Y10T428/3175; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31917
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
91 words
A packaging material which comprises a simultaneously coextruded film prepared in the absence of a substrate by T die extrusion or by the inflation process and comprising a conductive ethylene-ethyl acrylate copolymer resin layer containing more than 50 wt. % of ethyleneethyl acrylate copolymer resin of which the content of ethyl acrylate is more than 6 wt. %, 7 to 20 wt. % of carbon black and 0.01 to 1 wt. % of a lubricant and having a surface resistance of less than 10 10 Ω and a polyolefin resin layer.
Claim 2
Dependent Claim
91 words
A packaging material which comprises a simultaneously coextruded film prepared in the absence of a substrate by T die extrusion or by the inflation process and comprising a conductive ethylene-ethyl acrylate copolymer resin layer containing more than 50 wt. % of ethyleneethyl acrylate copolymer resin of which the content of ethyl acrylate is more than 6 wt. %, 7 to 20 wt. % of carbon black and 0.01 to 1 wt. % of a lubricant and having a surface resistance of less than 10 10 Ω and a polyolefin resin layer.
Claim 3
Dependent Claim
22 words
The packaging material of claim 1, on which a flexible sheet is further laminated on the side of said polyolefin resin layer.
Claim 4
Dependent Claim
20 words
The packaging material of claim 1, wherein said carbon black is acetylene carbon black or a modified by-product carbon black.
Claim 5
Dependent Claim
16 words
The packaging material of claim 1, wherein a conductive material other than carbon black is excluded.
Claim 6
Dependent Claim
20 words
The packaging material of claim 1, wherein a conductive material is blended into said conductive ethylene-ethyl acrylate copolymer resin layer.
Claim 7
Dependent Claim
43 words
The packaging material of claim 5, wherein said conductive material is selected from the group consisting of conductive metal particles, antistatic agents, a metal powder, a fibrous conductive filler or other filler hardened by using a liquid polymer or an organic solventsoluble polymer.
Claim 8
Dependent Claim
38 words
The packaging material of claim 6, wherein said lubricant is selected from the group consisting of silicone lubricants, oleic acid amide lubricants, erucic acid amide lubricants, stearic acid amide lubricants, bis fatty acid amide lubricants and alkylamine lubricants.
Claim 9
Dependent Claim
20 words
The packaging material of claim 1, wherein said polyolefin resin is polyethylene resin or a copolymer of ethylene and α-olefin.
Claim 10
Dependent Claim
13 words
The packaging material of claim 1, wherein said polyolefin resin is L-LDPE resin.
Claim 11
Dependent Claim
24 words
The packaging material of claim 1, wherein said polyolefin resin is a mixture of L-LDPE resin with LDPE resin, EVA resin or EEA resin.
Claim 12
Dependent Claim
16 words
The packaging material of claim 1, wherein said polyolefin resin layer further contains a light-shielding material.
Claim 13
Dependent Claim
14 words
The packaging material of claim 11, wherein said light-shielding material is a light-reflective material.
Claim 14
Dependent Claim
13 words
The packaging material of claim 12, wherein said light-reflective material is aluminum powder.
Claim 15
Dependent Claim
26 words
In a method of packaging photographic photosensitive materials, the improvement comprising using the packaging material of any one of the preceding claims as said packaging material.
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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) | 1992-10-02 | 1993-04-03 | 1993-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-02 | 1997-04-03 | 1997-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-02 | 2001-04-03 | 2001-10-03 | $7700.00 | Window Closed / Lapsed |