Polymeric pH-sensitive optical filter agents and articles includ

Details Polymeric pH-sensitive optical filter agents and articles includ Polymeric pH-sensitive optical filter agents and articles includ

1984-07-30

1985-10-08

Schilling, Richard L.

Radiation imagery chemistry: process, composition, or product th

Transfer procedure between image and image layer, image...

Diffusion transfer process, element, or identified image...

430221, 430236, 430244, 430517, G03C 554, G03C 140, G03C 184

Patent

active

045460620

ABSTRACT:
Polymeric optical filter agents and products and processes using same are disclosed. The polymeric optical filter agents are pH-sensitive materials comprising a polymeric backbone having a plurality of pendant moieties of the formula (I). ##STR1## wherein X is ##STR2## and R is alkyl, aryl, alkaryl or aralkyl; A is hydrogen, alkyl or the radical ##STR3## where each of Y.sup.1, Y.sup.2 and Y.sup.3 is hydrogen or an electron-withdrawing group; and each Z.sup.1, Z.sup.2 and Z.sup.3 is hydrogen or an electron-withdrawing group; with the proviso that, when each of Z.sup.1, Z.sup.2 and Z.sup.3 is hydrogen, said A is a radical ##STR4## wherein at least one of said Y.sup.1, Y.sup.2 and Y.sup.3 groups comprises an electron-withdrawing group. These agents upon contact with alkali are converted from a substantially non-light absorbing form to a highly colored light-absorbing form useful in photographic products.

REFERENCES:
patent: 4452878 (1984-06-01), Locatell et al.
patent: 4468494 (1984-08-01), Barton et al.
A. L. Bluhm, J. A. Sousa and J. Weinstein, Journal of Organic Chemistry, vol. 29, pp. 636-640 (1964).

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