Basf Aktiengesellschaft

Basf Se Corporation

Matthias Dust

Peter Neumann

Heidi Benthack-Thoms

Helmut Barzynski

Harald Kuppelmaier

Klaus-Dieter Schomann

Reinhold J Leyrer

Ernst Schefczik

Eberhard Koester

Michael Acker

Karl-Heinz Etzbach

Gerhard Wagenblast

Manfred Patsch

Hans-Werner Schmidt

Jochen Petzoldt

Uwe Meisenburg

Andrea Misske

Udo Bergmann

Matthias Maase

Klaus D Schomann

Klaus Pandl

Helmut Ringsdorf

Wolfgang Schrott

Claus Marschner

Hermann Bergmann

Peter Hauser

Guenter Baur

Holger Ganz

Virginie Bette

Uwe Nahr

Joerg L Jessen

Friedrich Wirsing

Gerd Schwantje

Gerhard Bertlein

Harald Kupplemaier

Friedrich Windscheid

Rudolf Kiefer

The invention relates to a process for preparing (meth)acrylic esters by esterifying (meth)acrylic acid or transesterifying at least one (meth)acrylic ester with at least one compound comprising at least one OH group in the presence of a heterogeneous catalyst comprising at least one inorganic salt, wherein the esterification or transesterification is performed in the presence of 300 to 3000 ppm of water based on the total weight of the reaction mixture.

Process for preparing (meth)acrylic esters

A process for preparing mono- or poly-C-C-alkyl- and/or -halogen-substituted arylcarbonyl chlorides (I), by, in a first stage, reacting a mono- or poly-C-C-alkyl- and/or -halogen-substituted aromatic (II) with CClin the presence of a Friedel-Crafts catalyst to give the corresponding mono- or poly-C-C-alkyl- and/or -halogen-substituted trichloromethylated aromatic (III), and, in a second stage, treating the trichloromethylated aromatic (III) with water or a protic acid in the presence of a catalyst to obtain the arylcarbonyl chloride (I). In a particularly preferred embodiment, the trichloromethylated aromatic (III) is not isolated as an intermediate and is used in the second stage dissolved in the solvent of the first stage.

Method for producing substituted arylcarboxylic acid chlorides

1,4-Diaminoanthraquinone-2,3-disulfonic acid (I) is prepared by reacting 1,4-diamino-2,3-dihaloanthraquinone (II) with boric acid in an inert organic solvent and further reacting the resulting reaction product (IIa) with an aqueous sulfite solution, by a method in which the inert organic solvent used is a nonpolar solvent having a boiling point of .gtoreq.130.degree. C. and a density of .ltoreq.0.95 g/cm.sup.3, and 1,4-diaminoanthraquinone-2,3-dinitrile (III) is prepared by reacting the 1,4-diaminoanthraquinone-2,3-disulfonic (I) with a cyanide.

Preparation of 1,4-diaminoanthraquinone-2,3-disulfonic acid and

Double attachment reactive dyes have the formula ##STR1## where U.sup.1 is C.sub.1 -C.sub.4 -alkyl, phenyl, C.sub.2 -C.sub.10 -alkenyl or the radical ##STR2## where Q.sup.1 and Q.sup.2 are each independently of the other hydrogen or C.sub.1 -C.sub.4 -alkyl and Q.sup.3 is a group which is detachable under alkaline reaction conditions,

Double attachment reactive dyes having alkyl- or alkenylsulfonyl and

An optical recording medium contains novel azulenemethine dyes of the formula ##STR1## where R is unsubstituted or substituted C.sub.1 -C.sub.6 -alkyl, X.sup..crclbar. is an anion, A.sup..sym. is heterocyclic radical, of the formula ##STR2## wherein R.sup.1, R.sup.2, R.sup.3, Y, Z and W are as defined, with the proviso that, when A.sup..sym. is a radical of the formula II f, II g, II i or II k, m is 2, A is 1, 2 or 3 and M is 1 or 2.

Azulenemethine dyes and an optical recording medium containing the novel

A novel panchromatic electrophotographic recording element has an electrically conducting substrate and one or more photoconducting layers. The photoconducting layer contains one or more binders, several charge carrier-producing compounds or sensitizers, one or more charge carrier-transporting compounds (photoconductors) and, if required, additives. The sensitizers themselves are Victoria Blue FB (C.I. 44045), Crystal Violet FN (C.I. 42555), Rhodamine FB (C.I. 45170), Astrazone Orange R (C.I. 48040) and/or Astrazone Orange G (C.I. 48035), which are used together with naphtholactam dyes and/or with isoindolenine dyes. The naphtholactam dyes have one or more chromophores of the general basic structure ##STR1## in the molecule, and the isoindolenine dyes have one or more chromophores of the general basic structure ##STR2## in the molecule.

Panchromatic electrophotographic recording element containing multiple

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

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

An electrophotographic recording element comprising

Electrophotographic recording element containing a naphtholactam dye

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

An optical recording medium contains, on a base, one or more dyes and a polymer which forms liquid-crystalline phases. The information is written into the uniformly oriented liquid-crystalline polymer layer, for example by means of a laser. During this procedure, the polymer heats up locally to above a phase transition temperature. By cooling, the resulting change is frozen in the glass state. The information can be erased by applying an electric field and/or heating. The recording material permits high-contrast storage and possesses high sensitivity, good resolution and excellent stability.

Optical recording medium

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Matthias Dust