C - Chemistry – Metallurgy – 09 – B
Patent
C - Chemistry, Metallurgy
09
B
96/127, 260/309.
C09B 11/08 (2006.01) G03C 1/10 (2006.01) G03C 5/54 (1980.01)
Patent
CA 1174238
Abstract of the Disclosure 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 sub- stituted 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 non- reversible to said light-screening dye.
339044
Polaroid Corporation
Smart & Biggar
LandOfFree
Sulfam(na)phthaleins as light-screening dyes does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Sulfam(na)phthaleins as light-screening dyes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sulfam(na)phthaleins as light-screening dyes will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1283020