Colour diffusion transfer process photographic elements...

Details Colour diffusion transfer process photographic elements... Colour diffusion transfer process photographic elements...

G - Physics

03

C

96/32

G03C 1/40 (2006.01) G03C 8/54 (2006.01)

Patent

CA 1104860

F-2A-18647/77 ABSTRACT OF THE DISCLOSURE In a photographic element for the colour diffusion transfer process including a neutralizing system for reducing the pH of an aqueous alkaline processing solution which com- prises 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 in such a relationship that the aqueous alkaline processing 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 (1) each of (A) at least one monomer selected from the group consisting of ethylene-type monomers having at least a free carboxylic acid group, a free sulfonic acid group or a free phosphoric acid group or a salt thereof and (B) at least one monomer selected from the group con- sisting of monomers represented by the following general formula (I) Image (I) wherein X is a hydrogen atom, a methyl group or a -COOR1 group; Y is a hydrogen atom, a methyl group or a -(CH2)nCOOR2 group; Z is an aryl group, a -COOR3 group or a _O?R3 group; R1, R2 and R3, which may be the same or different, each represents an aliphatic group or an aryl group; and n is an integer of 0 to 3, or (2) each of (A) at least one monomer selected from the group consisting of the ethylene type monomers described above, (B) at least one monomer selected from the group consisting of monomers represented by the general formula (I) above, and (C) at least one monomer selected from the group consisting of monofunctional or polyfunctional unsaturated monomers other than those monomers Abstract continued.... described in (A) and (B) above which are copolymerizable with the monomers described in (A) and (B) above and selected from the group consisting of acrylamides, methacrylamides, vinyl ethers, vinyl ketones, allyl compounds, olefins, vinyl heterocyclic compounds, unsaturated nitriles and polyfunctional monomers.

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