公开(公告)号：US5019492A

公开(公告)日：1991-05-28

申请号：US343981

申请日：1989-04-26

申请人： John M. Buchanan ,  Ewell R. Cook ,  Jared B. Mooberry ,  Gary S. Proehl ,  Stephen P. Singer ,  William N. Washburn

发明人： John M. Buchanan ,  Ewell R. Cook ,  Jared B. Mooberry ,  Gary S. Proehl ,  Stephen P. Singer ,  William N. Washburn

IPC分类号： G03C1/06 ,  G03C1/43 ,  G03C7/305 ,  G03C7/392

CPC分类号： G03C7/30511 ,  Y10S430/156 ,  Y10S430/157 ,  Y10S430/158 ,  Y10S430/159 ,  Y10S430/16 ,  Y10S430/161

摘要： A novel blocked photographically useful compound 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 photographically useful group (PUG) 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 PUG when the compound is reacted with a dinucleophile reagent. Such a blocked photographically useful compound is useful in a photographic material and process to provide increased stability and enable more rapid release of the photographically useful group upon reaction with a dinucleophile reagent.

公开(公告)号：US4557998A

公开(公告)日：1985-12-10

申请号：US688224

申请日：1985-01-02

申请人： William N. Washburn ,  Kenneth R. Hollister

发明人： William N. Washburn ,  Kenneth R. Hollister

IPC分类号： C08F20/00 ,  C08F20/34 ,  C08F20/36 ,  C08F20/52 ,  C08F20/60 ,  G03C7/26 ,  G03C7/305 ,  G03C7/32 ,  G03C7/327 ,  G03C1/40

CPC分类号： G03C7/30547 ,  G03C7/3275

摘要： Essentially colorless, hydrophilic ligand-releasing polymers are prepared from ethylenically unsaturated polymerizable monomers represented by the structure: ##STR1## wherein R' is hydrogen or lower alkyl, COUP is a photographic color coupling moiety, LINK is a coupling-off group which can be cleaved by an oxidized developer composition, and LIG is a ligand capable of complexing with metal ions, while joined to the polymer, to form a dye. These polymers also have recurring units which impart hydrophilicity to the polymer. These polymers form metal complex dyes in unexposed areas of photographic elements only, while the ligand is cleaved from the polymer in the exposed areas and washed out of the element.