Photographic diffusion transfer materials and processes utilizing balasted hydrazone compounds to release mobile acid dyes for transfer

Claim 2

A color photographic diffusion transfer process as claimed in claim 1, wherein as dye-giving compound a compound of the following general formula is used: in which R3 represents hydrogen, alkyl or aryl. R4 represents an aryl group which can be part of the chromophoric system of the dye radical; X represents a sulfonyl group, a carbonyl group or a single chemical bond; BALL represents a ballasting photographically inert radical rendering the dye-giving compound resistant to diffusion; and DYE represents a dye radical either on its own or together with R4.

Claim 3

A color photographic diffusion transfer process for the production of color images, which comprises exposing to a visible subject a light-sensitive photographic material comprising superposed red, green, and blue light-sensitive silver halide emulsion layers and having distributed therein or in layers adjacent thereto dye-giving compounds being resistant to diffusion during the development in the presence of an alkaline developing solution, capable of forming a cyan, magenta, and yellow diffusible acid dye on reaction with developer oxidation products and having the formula: in which R1 represents hydrogen, alkyl with up to 20 carbon atoms, aryl or amino substituted by alkyl or aryl, in which case two alkyl groups on the nitrogen can be closed together to form a ring; R2 represents alkyl with up to 20 carbon atoms, aryl, acyl derived from an aliphatic carboxylic acid with up to 20 carbon atoms or an aromatic carboxylic acid, or amino substituted by alkyl or aryl, in which case two alkyl groups on the nitrogen can be closed together to form a ring; or R1 and R2 together represent the ring members required to complete an isocyclic or heterocylic group; at least one of the radicals R1 and R2 carries the group A; X represents a sulfonyl group, a carbonyl group or a single chemical bond; A represents a photographically inert radical rendering the dye-giving compound resistant to diffusion; and B represents a dye radical; or A represents a dye radical either on its own or in conjunction with R2; and B represents a photographically inert radical rendering the dye-giving compound resistant to diffusion; treating said material with an alkaline developing solution in the presence of a developing agent and developing said imagewise exposed material, said dye-giving compounds reacting with the oxidation product of the developing agent during the development and thereby releasing each a cyan, magenta and yellow diffusible acid dye image in the areas of development, during the course of said development said dye images being transferred by diffusion wholly or in part imagewise in register to an image-receiving layer containing a basic mordant for acid dyes.

Claim 4

A process as claimed in claim 4 wherein, after the beginning of developMent, the photosensitive material is brought into intimate contact with the image-receiving layer and is separated from it again after the dye images have been transferred to form a color image in said image-receiving layer.

Claim 5

A process as claimed in claim 4, wherein, before the beginning of development, the photosensitive material is in intimate contact with the image-receiving layer and is separated from it after the dye images formed by development have been transferred to form a color image in said image-receiving layer.

Claim 6

A process as claimed in claim 4, wherein development is carried out by an alkaline liquid or viscous developer or activator solution in the presence of a developing agent containing a primary amino group.

Claim 7

A process as claimed in claim 4, wherein development is carried out by an alkaline liquid as viscous developer or activator solution in the presence of catechol or a derivative of catechol as developing agent.

Claim 8

A light-sensitive color photographic material comprising at least one silver halide emulsion layer and containing distributed therein or in a layer adjacent thereto a dye-giving compound being resistant to diffusion during development in the presence of an alkaline developing solution, capable of forming a diffusible dye on reaction with developer oxidation products and having the formula: in which R1 represents hydrogen, alkyl with up to 20 carbon atoms, aryl or amino substituted by alkyl or aryl, in which case two alkyl groups on the nitrogen can be closed together to form a ring; R2 represents alkyl with up to 20 carbon atoms, aryl, acyl derived from an aliphatic carboxylic acid with up to 20 carbon atoms or an aromatic carboxylic acid, or amino substituted by alkyl or aryl, in which case two alkyl groups on the nitrogen can be closed together to form a ring; or R1 and R2 together represent the ring members required to complete an isocyclic or heterocyclic group; at least one of the radicals R1 and R2 carries the group A; X represents a sulfonyl group, a carbonyl group or a single chemical bond; A represents a photographically inert radical rendering the dye-giving compound resistant to diffusion; and B represents a dye radical; or A represents a dye radical either on its own or in conjunction with R2; and B represents a photographically inert radical rendering the dye-giving compound resistant to diffusion;

Claim 9

A color photographic material is claimed in claim 9 which contains as dye-giving compound a compound of the following general formula: in this formula: R1 represents hydrogen, alkyl with up to 20 carbon atoms, aryl or amino substituted by alkyl or aryl, in which case two alkyl groups on the nitrogen can be closed together to form a ring; R2 represents alkyl with up to 20 carbon atoms, aryl, acyl derived from aliphatic carboxylic acids with up to 20 carbon atoms or aromatic carboxylic acids, or amino substituted by alkyl or aryl, in which case two alkyl groups on the nitrogen can be closed together to form a ring; or R1 and R2 together represent the ring members required to complete an isocyclic or heterocyclic group; at least one of the radicals R1 and R2 contains the group BALL; X1 represents a sulfonyl group or carbonyl group; BALL represents a ballasting photographically inert radical rendering the dye-giving compound resistant to diffusion; and DYE represents a dye radical.

Claim 10

A color photographic material as claimed in claim 9, which contains as dye-giving compound a compound of the following general formula: in this formula R3 represents hydrogen, alkyl or aryl; R4 represents an aryl group which Can be part of the chromophoric system of the dye radical; X represents a sulfonyl group, a carbonyl group or a single chemical bond; BALL represents a ballasting photographically inert radical rendering the dye-giving compound resistant to diffusion; and DYE represents a dye radical either on its own or together with R4.