Naphtholactam dyes and optical recording medium containing these dyes

Claim 1

An optical recording medium consisting of a base and a laser-sensitive, dye-containing layer of a polymer, said polymer being selected from thermoplastics or crosslinked plastics wherein the polymer contains one of more naptholactam dyes of the formula Ib ##STR35## where R 1 and R 3 are identical or different and independently of one another are each C 4 -C 20 -alkyl which may be interrupted by ether oxygen or each are benzyl,2-phenylethyl or C 5 or C 6 -cycloalkyl R 2 , R 4 and R 5 are identical or different and independently of one another are each hydrogen, C 1 -C 4 -alkyl, C 5 -C 6 -cycloalkyl, phenyl, alkoxycarbonyl in which alkoxy is C 1 -C 4 , carboxyalkyl in which alkyl is methyl or ethyl, hydroxyl, chlorine or bromine, n is 0 or 1, p, independently of n, is 0, 1 or 2, Z 1 and Z 2 are each hydrogen or, where n is 1, may together form an unsubstituted or C 1 -C 4 -alkyl-substituted C 2 - or C 3 -alkylene chain or together with the moiety to which they are attached from the radical ##STR36## and X- is an anion, and the rings A, B, C and D are unsubstituted or substituted by methyl, ethyl, phenyl, C 1 -C 4 -alkoxy, C 1 -C 6 -alkylthio, cyano, dialkylamine in which each alkyl is methyl or ethyl, chlorine, bromine, hydroxysulfonyl, phenylthio or the radical, ##STR37## with the proviso that if (a) at least one of the rings A, B, C, or D are unsubstituted or substituted by chlorine, bromine, C 1 -C 4 -alkoxy, dialkylamino in which each alkyl is methyl or ethyl, n and p are not simultaneously 0, (b) at least one of the rings A, B, C or D are unsubstituted or substituted by chlorine, bromine, C 1 -C 4 -alkoxy, dialkylamino in which each alkyl is methyl or ethyl, n is 1, p is 0 and Z 1 and Z 2 are each hydrogen R 2 is not hydrogen, (c) at least one of the rings A, B, C or D are unsubstituted or substituted by chlorine, bromine, C 1 -C 4 -alkoxy, dialkylamino in which each alkyl is methyl or ethyl, n is 0 and p is 1 or 2, R 4 and R 5 are not simultaneously hydrogen, and (d) at least one of rings A, B, C or D are unsubstituted or substituted by chlorine, bromine, C 1 -C 4 -alkoxy, dialkylamino in which each alkyl is methyl or ethyl, n and p are each 1 and Z 1 and Z 2 are each hydrogen, one or more of the radicals R 2 , R 4 and R 5 is not hydrogen.