US 4,066,459 AGranted

Free radical photosensitive compositions with improved sensitivity and shelf life stability

AssigneeHorizons Incorporated, a division of Horizons Research Incorporated

InventorsPaul L. Bachman, John J. Moskal

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Abstract

This invention relates to free-radical, non-silver, photosensitive films, particularly those suitable for optical development as described in U.S. Pat. No. 3,510,300. The invention comprises the incorporation of compounds which contain an imine (--C.dbd.N--) function and a hydroxyl group into otherwise known photosensitive compositions to improve optical development and to retard dark fogging so as to thereby provide aging stability to such compositions. Preferably, an additional improvement comprises provision of an overcoat for the photosensitive composition of this invention when in the form of thin films on a support such as a polyester or a paper sheet or glass plate. The overcoat acts to improve the shelf life and photosensitometric properties of the photosensitive composition.

Claims13

Dependent claims

In a photosensitive composition consisting essentially of:

a. at least one leuco diaryl- or triaryl-methane dye forming compound;
b. at least one dye base selected from the group consisting of styryl dye bases, cyanine dye bases and merocyanine dye bases;
c. at least one organic halogen compound which produces free radicals when exposed to a suitable dose of electromagnetic radiation;
and
d. a film forming polymer in which constituents (a), (b) and (c) are supported;
the improvement which comprises including in said composition an organic imino compound containing at least one hydroxyl group and selected from the group consisting of compounds represented by the following formulae:
##STR13## in which n is an integer up to 3 and the OH groups occupy at least one ortho-site;
X is an alkyl, aryl or halogen group and Z is selected from the group consisting of OH and alkyl with up to 4 carbon atoms;
##STR14##

6 more elements

Dependencies are inferred from the claim text.