Basf Aktiengesellschaft

Helmut Barzynski

Peter Neumann

Harald Kuppelmaier

Guenter Heil

Heinrich Hartmann

Klaus D Schomann

Wolfgang Schrott

Matthias Dust

Arend Werner

Heidi Benthack-Thoms

Klaus-Dieter Schomann

Herbert Naarmann

Ernst Schefczik

Rolf Osterloh

Eberhard Koester

Bernhard Albert

Gregor Ley

Sibylle Brosius

Peter Richter

Josef Lamprecht

Lutz Goethlich

Klaus Holoch

Dieter Lautenbach

Axel Sanner

Gerhard Wagenblast

Hartmut Hibst

Reinhold J Leyrer

Gerhard Hoffmann

Erhard Seiler

August Lehner

Werner Lenz

Christof Taubitz

Michael Schmitt

Gerhard Fahrbach

Herbert Stutz

Karl-Heinz Feuerherd

August Wigger

Heinz-Ulrich Werther

Michael Acker

Albert Elzer

Albrecht Eckell

Mong-Jon Jun

Peter Hauser

Dietrich Saenger

Burghard Schmitt

Michael Thomas

Uwe Klinsmann

Karl Klemm

Helfrid Sander

Karl-Ruediger Hellwig

Harald Kupplemaier

Heidi Benthack-Thomas

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

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.

Optical recording medium

A photosensitive recording material for recording information by means of a local change in the optical properties of a recording layer under the action of light having a high energy density, and a process for its preparation.

Recording material containing a layer of polymer particles and a

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 dyes

Photosensitive recording material

Laser-optical recording material comprises:

Sheet-like, multilayer, laser-optical recording material

Naphtholactam dyes and optical recording medium containing these days

Irreversible optical recording media record information through local alteration of the optical properties of a recording layer on exposure to light.

Irreversible optical recording media and fabrication thereof

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.

Novel tetraphenyldithiolene complexes, asymmetrically substituted

In an optical recording medium of the reflection type, the light-absorbing layer contains polypyrrole as the light-absorbing substance.

Thermoplastic mixtures based on macromolecular compounds and pyrrole polymers contain finely divided pyrrole polymers which are embedded in a matrix of the macromolecular compound. Such mixtures are prepared by a process in which solutions of the macromolecular compounds and compounds from the class consisting of the pyrroles are polymerized with an oxygen-containing oxidizing agent, and the resulting mixture is separated off from the solvent. Moldings obtained from such mixtures are used as electrical conductors or as electrodes.

Electrically conductive thermoplastic mixtures of macromolecular

Photopolymerizable recording materials which are suitable for the production of photoresist layers, and contain one or more thermoplastic vinyl polymers as the binder, one or more low molecular weight, ethylenically unsaturated, photopolymerizable compounds and one or more photoinitiators, with or without other, conventional additives and/or assistants, have excellent adhesion to metallic substrate surfaces if the binder employed is a vinyl polymer which possesses amino and/or imino groups.

Photopolymerizable recording material suitable for the production of

A resist film comprises a dimensionally stable base (B), which is transparent to actinic light in the wavelength range from 300 to 420 nm, and a mask-forming layer (ML) which is sensitive to heat radiation and contains a thermochromic system which, when irradiated with an IR laser having a wavelength greater than 1.00 .mu.m, undergoes an irreversible change in its absorption spectrum in the wavelength range from 300 to 420 nm so that the optical density of the mask-forming layer (ML) in this wavelength range changes by not less than 1.3 units. The base of the resist film can also be applied onto the photosensitive relief-forming layer (RL) of a recording material to give a multilayer image-recording material. Imagewise irradiation with heat, for example using an IR laser, produces, in the mask-forming layer (ML) of the resist film, a UV photomask which is very useful for exposing photosensitive recording materials.

Image-recording materials and image-recording carried out using these

A heat-sensitive recording material comprises a heat-sensitive layer which is applied onto a base and contains a color-producing substance, which is usually colorless or only slightly colored, and an activator which, under the action of heat, causes the color-producing substance to produce a coloration. In accordance with the invention, the heat-sensitive layer contains a sulfonic acid ester, in particular of a secondary alcohol, as the activator.

Heat-sensitive recording material

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Bad Duerkheim, Germany

Helmut Barzynski