| 摘要 |
<p>In a photographic element for the color diffusion transfer process including a neutralizing system for reducing the pH of an aqueous alkaline developing solution which comprises a neutralizing layer and a timing layer, wherein the timing layer is positioned on or under the neutralizing layer in direct or indirect contact therewith such that the aqueous alkaline developing solution reaches the neutralizing layer through the timing layer, the improvement which comprises the timing layer comprising a polymer latex which is produced by emulsion polymerization of each of at least one monomer selected from the group consisting of monomers of Group (A), at least one monomer selected from the group consisting of monomers of Group (B) and at least one monomer selected from the group consisting of monomers of Group (C), wherein said Group (A) monomers are represented by the following formula (I): <IMAGE> (I) wherein R represents a hydrogen atom or a methyl group; T represents a hydrogen atom or an aliphatic group; Q represents a -CH2OCOR0 group, <IMAGE> a -CH2OR2 group, <IMAGE> wherein R0 represents an aliphatic group or an aryl group; R1a and R1b, which may be the same or different, each represents an aliphatic group or R1a and R1b combine to form a ring; R2 represents a hydrogen atom or an aliphatic group; R3, R4, R5, R6 and R7, which may be the same or different, each represents a hydrogen atom or a -CH2OR2 group provided that all of R3 to R7 do not represent hydrogen atoms at the same time; and W represents an atomic group necessary to form a ring together with the -N-CO- linkage; and said Group (B) monomers are polymerizable ethylenically unsaturated monomers having at least one free carboxylic acid group or a free phosphoric acid group or salts thereof; and said Group (C) monomers are monomers other than those monomers described in Group (A) and Group (B) above which are copolymerizable with the monomers described in Group (A) and Group (B) above.</p> |
