Heat development process and color photographic recording material suitable for this process
First Claim
1. Heat development process for the production of colour images in which an imagewise exposed colour photographic recording material having at least one layer of binder arranged on a layer support and containing light-sensitive silver halide, optionally in combination with a substantially light-insensitive silver salt, and at least one non-diffusible, colour providing compound which is capable of releasing a diffusible dye as a result of development is developed by heat treatment in the presence of a thermal development and diffusion promoting agent, the dye released imagewise from the non-diffusible, colour providing compound being transferred to an image receptor layer capable of absorbing diffusible dyes, characterised in that the thermal development and diffusion-promoting agent corresponds to the following formula I ##STR7## wherein X denotes SO2 ;
- R1 to R4 denote alkyl, cycloalkyl, aralkyl or aryl;
R5 and R6 denote acyl or a group as defined for R1 to R4 ; and
R1 together with R5 ;
R2 together with R6 ;
R3 together with R4 ; and
/or R1 together with R2 may in each case form a heterocyclic ring containing at least one nitrogen atom.
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Accused Products
Abstract
Compounds of the formula I are suitable as thermal development and diffusion promoting agents for the heat development process. With the aid of said compounds higher color transfer densities can be achieved and/or the development time can be shortened. ##STR1## wherein X1 denotes --SO2 -- or--CO--;
R1 to R4 denote alkyl, cycloalkyl, aralkyl or aryl;
R5 and R6 denote acyl or a group as defined for R1 to R4 ; and R1 together with R5, R2 together with R6, R3 together with R4 and/or R1 together with R2 may in each case form a heterocyclic ring containing at least one nitrogen atom.
29 Citations
7 Claims
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1. Heat development process for the production of colour images in which an imagewise exposed colour photographic recording material having at least one layer of binder arranged on a layer support and containing light-sensitive silver halide, optionally in combination with a substantially light-insensitive silver salt, and at least one non-diffusible, colour providing compound which is capable of releasing a diffusible dye as a result of development is developed by heat treatment in the presence of a thermal development and diffusion promoting agent, the dye released imagewise from the non-diffusible, colour providing compound being transferred to an image receptor layer capable of absorbing diffusible dyes, characterised in that the thermal development and diffusion-promoting agent corresponds to the following formula I ##STR7## wherein X denotes SO2 ;
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R1 to R4 denote alkyl, cycloalkyl, aralkyl or aryl; R5 and R6 denote acyl or a group as defined for R1 to R4 ; and
R1 together with R5 ;
R2 together with R6 ;
R3 together with R4 ; and
/or R1 together with R2 may in each case form a heterocyclic ring containing at least one nitrogen atom. - View Dependent Claims (2, 3, 4)
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5. Colour photographic recording material developable by heat treatment, having at least one layer of binder which is arranged on a layer support and contains light-sensitive silver halide, optionally in combination with a substantially light-insensitive silver salt, at least one non-diffusible, colour providing compound which is capable of releasing a diffusible dye as a result of development by heat treatment, and at least one thermal development and diffusion promoting agent, characterised in that the thermal development and diffusion promoting agent corresponds to the following formula I:
- ##STR8## wherein X denotes SO2 ;
R1 -R4 denote alkyl, cycloalkyl, aralkyl or aryl; R5 and R6 denote acyl or a group as defined for R1 -R4 ; and
R1 together with R5 ;
R2 together with R6 ;
R3 together with R4 ; and
/or R1 together with R2 may in each case form a heterocyclic ring containing at least one nitrogen atom. - View Dependent Claims (6, 7)
- ##STR8## wherein X denotes SO2 ;
Specification