Polymeric pH-sensitive optical filter agents having hydrazone mo

Details Polymeric pH-sensitive optical filter agents having hydrazone mo Polymeric pH-sensitive optical filter agents having hydrazone mo

1981-04-02

1984-08-28

Henderson, Christopher A.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

430215, 525376, 525377, C08F 834, C08F 830

Patent

active

044684940

ABSTRACT:
Polymeric optical filter agents and photographic products and processes using same are disclosed. The polymeric optical filter agents are pH-sensitive optical filter agents comprising polymeric backbone units having the following hydrazone moiety: ##STR1## where R is a group which can provide a double bond for conjugation with the ##STR2## portion of the moiety to provide light-absorbing capability for the agent at a pH above its pKa, and X represents a substituent of R providing at least one electron-withdrawing group. The polymeric pH-sensitive optical filter agents have a highly colored light-absorbing form at a pH above the pKa and are substantially non-absorbing at a pH below the pKa. The polymeric optical filter agents are useful in photographic film units and processes for the protection of photoexposed photosenstive elements against the occurence of fogging during in-light development.

REFERENCES:
patent: 1866956 (1932-07-01), Tschunker
patent: 2350764 (1944-06-01), Jelley
patent: 2497526 (1950-02-01), Arnold
patent: 2763566 (1956-09-01), Van Allen
patent: 2875053 (1959-02-01), Minsk
patent: 2888346 (1959-05-01), Tulagin
patent: 3053678 (1962-09-01), Mix
patent: 3414650 (1968-12-01), Catino
patent: 3573287 (1971-03-01), Schorr
patent: 3697595 (1972-10-01), Clecak
patent: 3775405 (1973-11-01), Bruce
patent: 3953211 (1976-04-01), Imai
patent: 4266044 (1981-05-01), Timmerman
Jones, L. A., et al., J. Org. Chem., 25 (226), 1960.

Affiliated with

Also associated with

Rating

Polymeric pH-sensitive optical filter agents having hydrazone mo does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Polymeric pH-sensitive optical filter agents having hydrazone mo, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polymeric pH-sensitive optical filter agents having hydrazone mo will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-877955