| 摘要 |
1276961 Photographic transfer process AGFA-CEVAERT A G 2 June 1970 [14 June 1969] 26511/70 Heading G2C Silver salt diffusion transfer process in which development is effected in the presence of a mercapto compound (or thione tautomer) of formula: - in which R 1 is of formula: -SH or R 2 either (a) is optionally substituted amino, (b) together with R 1 completes a 2-mercaptothiadiazole ring, or (c) (in the case of a bistriazole compound) is the same as R 3 ; R 3 is H, or an optionally substituted alkyl or alkenyl group having 1-8C atoms, or an optionally substituted aryl, aralkyl or cycloalkyl group, or an amino group; Y is an alkylone chain comprising 2 to 10 methylene groups which are interrupted by one or more hetero atoms or imino groups. The mercapto compound is in the receiving layer (which may also contain nuclei), the developer or the activator. It improves the resistance of images to discolouration on storage and may increase image density. |
