| 摘要 |
<p>The present invention is concerned with novel 3,3-disubstituted-sulfam-phthaleins and - naphthaleins, photographic products and processes, particularly diffusion transfer products and processes employing as a colored light-screening dye(s), a 3,3-disubstituted sulfam-phthalein or -naphthalein wherein one of the 3-substituents is a 4'-hydroxy-1'-naphthyl moiety substituted in the 3'-position with a perhalomethylcarbinol group and the other of the 3-substituents is a phenyl moiety substituted with an electron-donating group and wherein the N atom of the sulfam-phthalein or -naphthalein ring is substituted with a carbonyl moiety possessing a -?- group bonded to the N atom of said sulfam-phthalein or -naphthalwin ring, which carbonyl moiety undergoes an irreversible cleavage reaction in alkaline solution above a predetermined alkaline pH to form a new compound which is colorless and nonreversible to said light-screening dye.</p> |
