| 摘要 |
An internal latent image type positive silver halide emulsion has improved sensitivity reduction in low illuminance exposures. A color diffusion transfer light-sensitive material incorporates the emulsion and has reduced sensitivity reduction. The internal latent image type positive silver halide emulsion is prepared using a polymer having a repetitive unit derived from an ethylenically unsaturated monomer having at least one thioether structure on a side chain as a deflocculating agent to form silver halide grains and subjecting the grain surfaces to a chemical sensitization in the presence of a polymer having a repetitive unit represented by the following Formula (I): <IMAGE> (I) wherein R1 represents a hydrogen atom or a substituted or unsubstituted alkyl group and Q represents a group selected from the group consisting of groups represented by the following Formula (1) to Formula (4): <IMAGE> (1) wherein q represents an integer of 2 to 4; <IMAGE> (2) wherein R2 and R3 each independently represents a hydrogen atom or a substituted or unsubstituted alkyl group; <IMAGE> (2) wherein Z1 represents a group of atoms necessary to form a substituted or unsubstituted lactam ring, a substituted or unsubstituted oxazolidone ring, or a substituted or unsubstituted pyridone ring; and A represents a single bond, a -C(=O)- group, or a group represented by the following Formula (3a): <IMAGE> (3a) wherein B represents an -O- group or an -N(R4)- group, in which R4 represents a hydrogen atom or a substituted or unsubstituted alkyl group; and k represents an integer of 1 to 6; <IMAGE> (4) wherein A has the same meaning as A in the above Formula (3); D represents a single bond, an -O- group or an -N(R5)- group; m and n each represents an integer of 1 to 6, which satisfy the relationship of m+n=4 to 7, in which R5 represents a hydrogen atom, a substituted or unsubstituted alkyl group, or a group represented by the following Formula (4a): <IMAGE> (4a) wherein R6 represents a substituted or unsubstituted alkyl group.
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