Subbing material for styrene bases used in photographic elements

Claim 1

A method for manufacturing a photographic material which comprises coating a subbing composition in layer form on a styrene-based polymer support, said composition consisting essentially of 5g or less per m 2 of said support of a complete or partial reaction product of: materials consisting essentially of (a) a copolymer of styrene or vinyl acetate with maleic anhydride which contains 40-50% by weight of maleic anhydride with (b) water or a hydroxy compound represented by the general formula R 1 --OH wherein R 1 is a monovalent hydrocarbon group having 1 to 12 carbon atoms or monovalent organic group having 2-12 carbon atoms and consisting of at least two hydrocarbon fragments and at least one ether linkage between said hydrocarbon fragments, at least 30% of the maleic anhydride units of said copolymer being reacted with the water or the hydroxy compound thereby obtaining a reaction product consisting essentially of the following recurring units: ##STR3## in which R 3 is a hydrogen atom or a group defined by R 1 , R 2 is a phenyl group or a --OCOCH 3 group and the amount of the maleic anhydride unit in said copolymer may be zero, and coating a hydrophilic photographic composition containing a hydrophilic resin binder in layer form on the subbing layer, where the resulting hydrophilic photographic composition layer is selected from the group consisting of (1) a layer containing silver halide, (2) a layer containing physical developing nuclei to serve as a receiving layer in diffusion transfer photography, a hydrophilic photographic curl preventing backing layer or a hydrophilic photographic anti-halation backing layer, where a compound containing at least two epoxy groups per molecule is contained in a proportion of from 10 to 500% by weight based on the weight of said copolymer in at least one of the subbing composition or the hydrophilic photographic composition.

Claim 2

A method for manufacturing a photographic material which comprises coating a subbing composition in layer form on a styrene-based polymer support, said composition consisting essentially of 5g or less per m 2 of said support of a complete or partial reaction product of: materials consisting essentially of (a) a copolymer of styrene or vinyl acetate with maleic anhydride which contains 40-50% by weight of maleic anhydride with (b) water or a hydroxy compound represented by the general formula R 1 --OH wherein R 1 is a monovalent hydrocarbon group having 1 to 12 carbon atoms or monovalent organic group having 2-12 carbon atoms and consisting of at least two hydrocarbon fragments and at least one ether linkage between said hydrocarbon fragments, at least 30% of the maleic anhydride units of said copolymer being reacted with the water or the hydroxy compound thereby obtaining a reaction product consisting essentially of the following recurring units: ##STR3## in which R 3 is a hydrogen atom or a group defined by R 1 , R 2 is a phenyl group or a --OCOCH 3 group and the amount of the maleic anhydride unit in said copolymer may be zero, and coating a hydrophilic photographic composition containing a hydrophilic resin binder in layer form on the subbing layer, where the resulting hydrophilic photographic composition layer is selected from the group consisting of (1) a layer containing silver halide, (2) a layer containing physical developing nuclei to serve as a receiving layer in diffusion transfer photography, a hydrophilic photographic curl preventing backing layer or a hydrophilic photographic anti-halation backing layer, where a compound containing at least two epoxy groups per molecule is contained in a proportion of from 10 to 500% by weight based on the weight of said copolymer in at least one of the subbing composition or the hydrophilic photographic composition.