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Harald Kuppelmaier

Klaus D Schomann

Sibylle Brosius

Peter Neumann

Bernhard Albert

Michael Schmitt

Helmut Barzynski

Wolfgang Schrott

Michael Acker

Matthias Dust

Heidi Benthack-Thoms

Klaus-Dieter Schomann

Gerhard Wagenblast

Ernst Schefczik

Eberhard Koester

Karl-Heinz Feuerherd

Peter Hauser

Michael Thomas

Ulrich Harten

Mathias Dust

Carbonyloxy-substituted azulenesquaric acid dyes of the formula ##STR1## where L is C.sub.1 -C.sub.12 -alkylene which may be substituted by phenyl,

Carbonyloxy-substituted azulenesquaric acid dyes, intermediates therefor

Polymethine dyes suitable for use in an optical recording medium have the formula ##STR1## where p is 0 or 1,

Heterocyclic polymethine dyes with carbamate or amide groups

Binary azulenesquaric acid dyes of the formula ##STR1## where X is a bridging member, Y is hydrogen, cyano or formula CO--OR.sup.5, CO--NHR.sup.5, OR.sup.5, O--CO--OR.sup.5, NH--CO--R.sup.5, NH--CO--OR.sup.5 or NH--SO.sub.2 --R.sup.5, where R.sup.5 is hydrogen, C.sub.1 -C.sub.12 -alkyl, C.sub.2 -C.sub.12 -alkenyl, C.sub.5 -C.sub.7 -cycloalkyl or unsubstituted or substituted phenyl, L.sup.1 and L.sup.2 are each, independently of one another, a chemical bond or unsubstituted or substituted C.sub.1 -C.sub.12 -alkylene and R.sup.1, R.sup.2, R.sup.3, R.sup.4, Q.sup.1, Q.sup.2, Q.sup.3 and Q.sup.4 are each, independently of one another, hydrogen or unsubstituted or substituted C.sub.1 -C.sub.12 -alkyl, their intermediates and an optical recording medium containing the novel dyes are described.

Binary azulenesquaric acid dyes, their intermediates and optical

An optical recording medium consists essentially of a base material and a light-absorbing layer which contains a thermoplastic binder and at least one dye, wherein the thermoplastic binder is a polycyclic hydrocarbon which has a glass transition temperature Tg of greater than 150.degree. C. and is soluble to more than 3% by weight in an aliphatic or aromatic hydrocarbon.

Optical recording medium

Amido-containing azulene-aquaric acid dyes of the formula ##STR1## where L is C.sub.1 -C.sub.12 -alkylene which may be substituted by phenyl,

Amido-containing azulene squaric acid dyes, intermediates therefor and

Methine dyes of the formula ##STR1## where R.sup.1, R.sup.2, R.sup.3, R.sup.4, X, Y and the rings A and B each have specific meanings, and methine dyes obtainable by reacting an organic mono- or polyisocyanate with such a methine dye of the abovementioned formal where only the radicals R.sup.1 and/and R.sup.4 have a group reacting with an organic mono- or polyisocyanate are useful in optical recording media.

Methine dyes and optical recording medium containing same

Azulenesquaric acid dyes of the formula ##STR1## where L is substituted or unsubstituted C.sub.1 -C.sub.12 - alkylene,

A zulenes containing a urethane group

Azulenesquaric acid dyes of the formula ##STR1## where R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 each have specified meanings are prepared from azulene derivatives of the formula ##STR2## where R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 each have specified meanings as intermediates, and used in an optical recording medium.

Azulenesquaric acid dyes, azulene intermediates therefor, and optical

Quinoxalinepentamethine dyes of the formula ##STR1## where R.sup.1 is hydrogen, substituted or unsubstituted C.sub.1 -C.sub.22 -alkyl or substituted or unsubstituted C.sub.5 -C.sub.7 -cycloalkyl,

Quinoxalinepentamethine dyes and optical recording medium containing same

Naphtholactamtrimethine dyes useful in optical recording media have the formula ##STR1## where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are identical or different and each is independently of the others C.sub.1 -C.sub.22 -alkyl, which may be substituted and/or interrupted by one or more oxygen atoms, one or more imino groups or one or more C.sub.1 -C.sub.4 -alkylimino groups, or is substituted or unsubstituted C.sub.5 -C.sub.7 -cycloalkyl or substituted or unsubstituted phenyl, and the rings A, B, C and D may each be substituted and/or benzofused.

Naphtholactamtrimethine dyes and optical recording medium containing same

An optical recording medium comprises a support material and a light-absorbing layer consisting essentially of a soluble mixture of a thermoplastic binder and at least one dye, wherein the thermoplastic binder is a phenol-aldehyde resin having an average molecular weight of greater than 300 which is soluble in an alcohol having a boiling point of less than 200.degree. C.

Metal-containing or metalfree, monosubstituted or disubstituted phthalocyanines I which have one or two of the following radicals R as substituents on their benzene rings: R=bromine, cyano, C.sub.1 -C.sub.3 -alkyl, n-butyl, i-butyl, C.sub.5 -C.sub.20 -alkyl, C.sub.5 -C.sub.10 -cycloalkyl, fluorinated C.sub.1 -C.sub.6 -alkyl, C.sub.6 -C.sub.20 -aryl, XR.sup.1, where X is oxygen, sulfur, selenium, tellurium or imino (NH) and R.sup.1 is C.sub.1 -C.sub.6 -alkyl, fluorinated C.sub.1 -C.sub.6 -alkyl or C.sub.6 -C.sub.20 -aryl, or Si(R.sup.2).sub.3, where R.sup.2 is C.sub.1 -C.sub.6 -alkyl, each and every substituted benzene ring being substituted by only one R radical, are useful in Laser-optical recording materials.

Monosubstituted and disubstituted phthalocyanines

Naphtholactam dyes of the formula ##STR1## where R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, n, p, Z.sup.1, Z.sup.2 and the rings A, B, C and D each have the meanings stated in the description, and an optical recording medium which contains one or more naphtholactam dyes and may contain a base.

Naphtholactam dyes and optical recording medium containing these days

Naphtholactamsquaric acid dyes of the formula ##STR1## where R.sup.1 and R.sup.2 independently of one another are each unsubstituted or substituted C.sub.3 -C.sub.22 -alkyl, in which the alkyl chain may be interrupted by oxygen atoms, or are each unsubstituted or substituted C.sub.1 -C.sub.4 -aralkyl, unsubstituted or substituted C.sub.5 -C.sub.7 -cycloalkyl or unsubsituted or substituted phenyl, and the rings A, B, C and D are unsubstituted or substituted and/or benzofused, and optical recording materials consisting of a base and a layer which is sensitive to laser light and is composed of a thermoplastic or crosslinked polymer and one or more dyes (I). Because of the high light absorption of (I), the recording materials are very sensitive to light from the GaAlAs semiconductor laser. An excellent signal-to-noise ratio is obtained on reading the recordings.

Naphtholactamsquaric acid dyes and optical recording materials

Tetraphenyldithiolene complexes of the formula ##STR1## and novel asymmetrically substituted benzoins of the formula ##STR2## where X.sup.1, X.sup.2 and X have the meanings stated in the description and Me is nickel, palladium or platinum. The complexes have very high absorption in the range from 800 to 950 nm and are readily soluble in the plastics used for the production of optical recording materials.

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Heidelberg, Germany

Harald Kuppelmaier