Optical recording medium containing an azulenium dye
AssigneeBASF SE
InventorsWolfgang Schrott, Bernhard Albert, Peter Neumann, Heidi Benthack-Thoms
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Abstract
An optical recording medium composed of a base material and a laser light sensitive layer which contains an azulenium dye as storage material with or without a binder is obtainable by spin-coating a solution containing an azulenium dye of the formula ##STR1## where R is C.sub.1 -C.sub.6 -alkyl which may be substituted or unsubstituted, and n is 1, 2 or 3, with or without a binder and one or more solvents which have evaporation numbers of not less than 4 and in which an azulenium dye of the abovementioned formula has a solubility of not less than 5 g/l onto a transparent base material based on a plastics material or glass.
Claims7
An optical recording medium composed of a base material and a laser light sensitive layer which contains an azulenium dye as storage material with or without a binder and obtainable by spincoating a solution containing an azulenium dye of the formula:
- ##STR4## where R is C.sub.1 -C.sub.6 -alkyl, and n is 1, 2 or 3, with or without a binder selected from the group consisting of polyorgano-siloxanes, epoxides, poly(meth)acrylates, polystyrene homopolymers or copolymers, polyvinylcarbazole, polyvinylpyrrolidone, polyimidazole copolymers, polyvinyl ester copolymers, polyvinyl ether copolymers, polyvinylidene chloride copolymers, acrylonitrile copolymers, polyvinyl chloride or copolymers thereof, and a solvent selected from the group consisting of bromoform and 1,1,2-trichloroethane, onto a transparent base material based on a plastic material or glass at from 10.degree. to 50.degree. C. the spincoating solution having a content of dissolved solids of 0.1 to 15% by weight, based on the solution, and containing from 0 to 50% by weight, based on the content of dissolved solids of the spincoating solution, of a binder.
Dependencies are inferred from the claim text.