Optical recording medium, and process for the preparation thereof

摘要

The medium contains a carrier layer onto which a light-absorbing layer is applied which either consists of a dye of the formula <IMAGE> or which contains this dye. In the formula, at least one X is <IMAGE> and the other X are hydrogen, -OR<3>, -SR<3> and/or -NO2, A is <IMAGE> alkyl which may be substituted, phenyl, benzyl or phenylethyl, or a group <IMAGE> in 2, 3, position, n is 0, 1, 2, 3 or 4, the number of -NO2 groups being 2, R<1>, R<2> and R<3> are hydrogen, alkyl, alkoxyalkyl, cyclohexyl, phenyl or phenylalkyl, the phenyl radicals possibly being further substituted, or <IMAGE> are a saturated 5- or 6-membered heterocyclic ring and R<4> is alkyl, alkoxyalkyl or C2/C3-alkylcarboalkoxy. The dyes have an absorption maximum in the range from 600 to 660 nm. The recording medium can be written and read with He-Ne lasers.