Heat-developable photosensitive material and heat-developing method using the same

A heat developing method for a heat-developable photosensitive material comprising steps of:

• preparing a heat-developable photosensitive material, the heat-developable photosensitive material comprising at least a photosensitive silver halide, a nonphotonsensitive organic silver salt, a reducing agent, a developing accelerator, a color adjusting agent and a binder on a support, wherein
• the photosensitive material has an average contrast of 2.5 or more and 6 or less at a density between 1.5 and 3.0;
• with the photosensitive silver halide including silver iodide at 5 mol % to 100 mol % and the average particle size of said photosensitive silver halide being 5 nm to 80 nm;
• image exposing the heat-developable photosensitive material;
• and
• heat-developing the heat-developable photosensitive material at a maximum temperature of between 100° C. and 120° C.;
• wherein the developing accelerator is a compound represented by the following formula (I):
• Q1-NHNH—R1 Formula (I)
• wherein, in the formula (I), Q1 represents a five- to seven-membered unsaturated ring connected to NHNH—R1 through a carbon atom, R1 represents a group selected from a carbamoyl group, an acyl group, an alkoxycarbonyl group, a sulfonyl group and a sulfamoyl group;
• and
• said reducing agent is represented by the following formula (VII):
• wherein each of R71 and R71′ independently represents an alkyl group having 1 to 20 carbon atoms, each of R72 and R72′ independently represents a hydrogen atom or a substituent with which a benzene ring may be substituted, each of X71 and X71′ independently represent a hydrogen atom or a substituent with which a benzene ring may be substituted, L represents one of —S— and —CHR73— and R73 represents one of a hydrogen atom and an alkyl group having 1 to 20 carbon atoms.

A heat-developable photosensitive material comprising at least a photosensitive silver halide, a nonphotonsensitive organic silver salt, a reducing agent, a developing accelerator, a color adjusting agent and a binder on a support, wherein

• said photosensitive material does not contain a super-high tone agent;
• said photosensitive material has an average contrast of 2.5 or more and 6 or less at a density between 1.5 and 3.0;
• said photosensitive silver halide includes silver iodide at 5 mol % to 100 mol %;
• and
• the average particle size of said photosensitive silver halide is 5 nm to 80 nm;
• the developing accelerator is a compound represented by the following formula (II):
• wherein, in the formula (II), X2 represents a hydrogen atom or a substituent, R21 represents a hydrogen atom or substituent, and p denotes an integer from 0 to 4;
• and
• the reducing agent is represented by the following formula (VII):
• wherein each of R71 and R71′ independently represents an alkyl group having 1 to 20 carbon atoms, each of R72 and R72′ independently represents a hydrogen atom or a substituent with which a benzene ring may be substituted, each of X71 and X71′ independently represent a hydrogen atom or a substituent with which a benzene ring may be substituted, L represents one of —S— and —CHR73— and R73 represents one of a hydrogen atom and an alkyl group having 1 to 20 carbon atoms.

A heat developing method for a heat-developable photosensitive material comprising steps of:

• preparing a heat-developable photosensitive material, the heat-developable photosensitive material comprising at least a photosensitive silver halide, a nonphotonsensitive organic silver salt, a reducing agent, a developing accelerator, a color adjusting agent and a binder on a support, wherein
• the photosensitive material has an average contrast of 2.5 or more and 6 or less at a density between 1.5 and 3.0;
• with the photosensitive silver halide including silver iodide at 5 mol % to 100 mol % and the average particle size of said photosensitive silver halide being 5 nm to 80 nm;
• image exposing the heat-developable photosensitive material;
• and
• heat-developing the heat-developable photosensitive material at a maximum temperature of between 100° C. and 120° C.;
• wherein the developing accelerator is a compound represented by the following formula (II):
• wherein, in the formula (II), X2 represents a hydrogen atom or a substituent, R21 represents a hydrogen atom or substituent, and p denotes an integer from 0 to 4;
• and
• said photosensitive material does not contain a super-high tone agent;
• said reducing agent is represented by the following formula (VII):
• wherein each of R71 and R71′ independently represents an alkyl group having 1 to 20 carbon atoms, each of R72 and R72′ independently represents a hydrogen atom or a substituent with which a benzene ring may be substituted, each of X71 and X71′ independently represent a hydrogen atom or a substituent with which a benzene ring may be substituted, L represents one of —S— and —CHR73— and R73 represents one of a hydrogen atom and an alkyl group having 1 to 20 carbon atoms.