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Abstract

The present invention relates to a photochromic polymer for photo recording purposes comprising polymethacrylate, and having the following general formula: ##STR1## wherein R is --(CH.sub.2).sub.o --X--C.sub.6 H.sub.4 --Z--C.sub.6 H.sub.4 --R.sub.1, wherein R.sub.1 is an electron acceptor, such as cyano, alkoxy having 1 to 8 carbon atoms, halosubstituted alkoxy having 1 to 8 carbon atoms, halogen (F, Cl), hydroxy, esters of the formula --OOC--C.sub.n H.sub.2n-1, --CO--C.sub.n H.sub.2n-1, wherein n is 1 to 8, preferably 4 to 6, but excluding nitro, Br, I, and --SO.sub.3 H, X is selected from the group consisting of --O--, and --COO--, Z is selected from the group consisting of --N.dbd.N--, --CH.dbd.N--, or --CH.dbd.CH--, wherein --CH.dbd. of the --CH.dbd.N-- group is bound to the main part of the structure, R.sub.2 is C.sub.m H.sub.2m+1, wherein m is an integer 4 to 7, o is a number of 7 to 12, preferably 10, and a is number providing for a photo chromic polymer.

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First Claim