Light-sensitive material containing a dye-forming combination of a heterocyclic compound and a cyclic dihalodicarbonyl compound in a polymeric binder

Claim 1

A light sensitive storage material for optical data recording comprising in a supported or self-supporting layer comprised of a polymeric hydrophobic binder selected from the group consisting of homopolymers and copolymers of monomers which have copolymerizable olefinic double bonds, polyvinyl acetals and cellulose esters and a dye-forming combination of a heterocyclic compound of the formula ##STR5## X represents oxygen, sulfur or the group >N--R 3 , Y represents nitrogen or the group ≧C--R 4 , R 1 and R 2 , which may be the same or different represent hydrogen or an alkyl or aryl group of may together represent the group required for completing a condensed benzene or naphthalene ring which may be substituted, R 3 represents hydrogen or an alkyl or aryl group and R 4 represents hydrogen or an alkyl group; and of a cyclic dihalodicarbonyl compound of the formula ##STR6## in which Z represents oxygen or the group >N--R 6 or ##STR7## R 5 represents chlorine or bromine, R 6 represents hydrogen or an alkyl group and R 7 and R 8 , which may be the same or different represent hydrogen or an alkyl group said heterocyclic compound of formula I and said cyclic dihalodicarbonyl compound of formula II being in amounts effective to provide said dye-forming combination upon exposure to ultraviolet light in a first range of wavelengths with capability of forming an image which is in a state of luminescence upon exposure to ultraviolet light in a second range of wavelengths not including said first range, and in a proportion of said heterocyclic compound of formula I being in at least double the molar quantity of the compound of formula II.