BLOCKED FILTER DYES FOR PHOTOGRAPHIC MATERIAL AND PROCESS

摘要

A novel blocked filter dye comprises a new blocking group that (a) comprises two electrophilic groups, the least electrophilic of which is bonded directly or through a timing group to the filter dye group of the compound, (b) is capable of reacting with a dinucleophile reagent, and (c) has the two electrophilic groups separated from each other by a bond or unsubstituted or substituted atom that enables nucleophilic displacement to occur with release of the filter dye when the compound is reacted with a dinucleophile reagent. Such a blocked filter dye is useful in a photographic material and process to provide increased stability and enable more rapid release of the filter dye upon reaction with a dinucleophile reagent.