Paper material for photosensitive materials and method of producing the same
AssigneeFuji Photo Film Co., Ltd.
InventorMutsuo Akao
Life of this patent
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Abstract
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.
Claims14
A paper material for photosensitive materials consisting essentially of a paper support having a thickness of 30 to 330 microns and an areal weight of 30 to 300 g/m.sup.2 and a coextruded multilayer extrusion laminating layer laminated onto the paper support, wherein said coextruded multilayer extrusion laminating layer comprises an adhesive layer comprising less than 5 wt. % of carbon black and 5 to 90 wt. % of acid-modified adhesive polyolefin resin laminated onto the paper support and a surface layer comprising more than 3 wt. % of carbon black and more than 10 wt. % of ethylene copolymer resin having a melt index of more than 2 g/10 minutes.
A paper material for photosensitive materials consisting essentially of a paper support having a density of more than 0.80 g/cm.sup.3, a thickness of 30 to 330 microns and an areal weight of 30 to 300 g/m.sup.2, a coextruded multilayer extrusion laminating layer laminated onto one side of the paper support, and a polyolefin resin extrusion laminating layer having a thickness of 5 to 7 microns containing 5 to 95 wt. % in the total content of either or both of high density homopolyethylene resin having a density of more than 0.940 g/cm.sup.3 and ethylene-.alpha.-olefin copolymer resin laminated onto the other side, the coextruded multilayer extrusion laminating layer comprising an adhesive layer comprising 5 to 90 wt. % of acid-modified adhesive polyolefin resin laminated onto the paper support and a polyolefin resin surface layer containing more than 3 wt. % of light-reflective light-shielding material.
A paper material for photosensitive materials consisting essentially of a paper support having a thickness of 30 to 330 microns and an areal weight of 30 to 300 g/m.sup.2, a light-absorptive coextruded multilayer extrusion laminating layer comprising a surface layer containing light-absorptive light-shielding material and an adhesive layer containing 5 to 90 wt. % of acid-modified adhesive polyolefin resin laminated onto one side of the paper support and a light-reflective coextruded multilayer extrusion laminating layer comprising a surface layer containing light-reflective light-shielding material and an adhesive layer of which the light-shielding material content is less than 3 wt. % laminated onto the other side of the paper support.
A paper material for photosensitive materials consisting essentially of a paper support having a thickness of 30 to 330 microns and an areal weight of 30 to 300 g/m.sup.2, a light-absorptive coextruded multilayer extrusion laminating layer comprising a surface layer consisting of thermoplastic resin containing 3 to 20 wt. % of black pigment and having a moisture content of less than 600 ppm and an adhesive layer comprising 5 to 90 wt. % of acid modified adhesive polyolefin resin of which the light-shielding material content is less than 5 wt. % and the moisture content is less than 500 ppm laminated onto one side of the paper support by extrusion laminating, and a light-reflective coextruded multilayer extrusion laminating layer comprising a surface layer consisting of thermoplastic resin containing 3 to 40 wt. % of light-reflective light-shielding material and having a moisture content of less than 600 ppm and an adhesive layer consisting of polyolefin resin of which the light-shielding material content is less than 3 wt. % and the moisture content is less than 500 ppm laminated onto the other side of the paper support by extrusion laminating, and at least one of the surface layers containing 5 to 95 wt. % of the total content of either or both of high density homopolyethylene resin having a density of more than 0.940 g/cm.sup.3 and ethylene-.alpha.-olefin copolymer resin.
A paper material for photosensitive materials comprising a paper support formed of wood pulp containing 30 to 100% of hardwood pulp having a Bekk smoothness of more than 90 seconds, a density of 0.7 to 1.3 g/cm.sup.3, thickness of 30 to 150 .mu.m and an areal weight of 30 to 120 g/m.sup.2, and a coextruded multilayer extrusion laminating layer laminated to the paper support, and the coextruded multilayer extrusion laminating layer comprising an adhesive layer of which the carbon black content is less than 5 wt. % and the acid-modified adhesive polyolefin resin content is 5 to 90 wt. % laminated onto the paper support and a surface layer comprising more than 3 wt. % of a light-absorptive light-shielding material selected from the group consisting of carbon black, graphite and titanium nitride, more than 10 wt. % of ethylene-.alpha.-olefin copolymer resin having a density of 0.87 to 0.94 g/cm.sup.3 and a melt index of 1 to 40 g/10 minutes produced by using a Ziegler catalyst, at least one member selected from the group consisting of lubricant, silicon dioxide and zeolite and antioxidant.
A paper material for photosensitive materials consisting essentially of a paper support, a thickness of 30 to 330 microns and an areal weight of 30 to 300 g/m.sup.2, a black coextruded multilayer extrusion laminating layer comprising a surface layer containing black light-shielding material and an adhesive layer comprising 5 to 90 wt. % of acid-modified adhesive polyolefin resin laminated on the photosensitive material side, and a light-reflective thermoplastic resin extrusion laminating layer containing light-reflective light-shielding material having a refractive index of more than 1.51 laminated on the other side of the paper support.
Dependencies are inferred from the claim text.