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Paper material for photosensitive materials and method of producing the same
| Details |
Inventors: Akao, Mutsuo;
Assignee: Fuji Photo Film Co., Ltd. (Kanagawa, JP)
Primary Examiner: Ryan; Patrick J.
Assistant Examiner: Krynski; William A.
Attorney, Agent or Firm: Burns, Doane, Swecker & Mathis
A paper material for photosensitive materials consisting essentially of a paper support and a coextruded multilayer extrusion laminating layer laminated onto the paper support. The coextruded multilayer extrusion laminating layer has an adhesive layer comprising less than 5 wt. % of carbon black and 5 to 90 wt. % of acid-modified adhesive polyolefin resin that is adhered to the paper support and a surface layer comprising less than 3 wt. % of carbon black and more than 10 wt. % of ethylene copolymer resin. The paper material does not induce fogging, sensitivity deviation or the like upon photosensitive materials and has a great adhesive force between the paper support and the resin layer. A method for producing the paper material. is also disclosed. |
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DETAILED DESCRIPTION An object of the invention is to provide a paper material for photosensitive materials which does not induce fogging, sensitivity deviation or the like upon photosensitive materials and which has a great adhesive force between the paper support and the resin layer, and a method of producing the same.
Another object of the invention is to provide a paper material for photosensitive materials which is excellent in light-shielding, cutability and adhesive strength, and no occurrence of film cracking, film rupturing, pinholes and the like in order to ensure complete light-shielding, when it is used as a light-shielding paper for packaging photosensitive materials.
Another object of the invention is to provide a paper material for photosensitive materials which is excellent in cutting properties, adhesive strength and sharpness and has low neck-in and low tendency for curling, when it is used as a support for photographic printing paper.
Another object of the invention is to provide a paper material for photosensitive materials which improves printability and is excellent in light-shielding, adhesive strength, obverse-reverse discrimination, photographic properties, resistance to curling and cutting properties.
The present invention provides paper materials which have achieved the above objects, comprising a paper support and a coextruded multilayer extrusion laminating layer, wherein the coextruded multilayer extrusion laminating layer comprises an adhesive layer containing less than 5 wt.
% of carbon black and 5 to 90 wt.
% of acid-modified adhesive polyolefin resin adhered to the paper support and a surface layer containing more than 3 wt.
% of carbon black and more than 10 wt.
% of an ethylene copolymer resin having a melt index (ASTM D-1238, measuring temperature: 190.
degree.
C.
) of more than 2 g/10 minutes.
The paper material is particularly suitable as a light-shielding paper wound together with a rolled photosensitive material and the like.
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