Merck Patent Gesellschaft MIT Beschrankter Haftung

Merck Patent Gesellschaft MIT Beschraenkter Haftung

Jurgen Eichler

Claus P Herz

Karl-Heinz Neisius

Rudolf Eidenschink

Gregor Wehner

Joachim Krause

Georg Weber

Bernhard Scheuble

Andreas Wachtler

Heterocyclic boron compounds of the formula I

Heterocyclic boron compounds

Compounds of the formula ##STR1## wherein A, X, Z, R.sup.1, R.sup.2, R.sup.3, R.sup.4, n and m are defined hereinbelow are effective photoinitiators especially for the photopolymerization of ethylenically unsaturated compounds and for the curing of printing inks.

Aromatic-aliphatic ketones useful as photoinitiators

New benzonitriles of formula I ##STR1## wherein R.sup.1 and R.sup.2 are each alkyl groups of 1-8 C atoms, and one of these radicals can also be alkoxy of 1-8 C atoms, and Q is one or two radicals selected from 1,4-phenylene, 1,4-cyclohexylene and/or 1,4-bicyclo[2.2.2] octylene, are very useful for preparing liquid crystallene dielectrics and electrooptical display elements based thereon.

Benzonitriles

Mixtures containing at least one hydroxyalkylphenone of the formula ##STR1## wherein R.sup.1 is H, alkyl of 1-4 C atoms or chlorine, R.sup.2 is H or methyl, R.sup.3 is H or methyl, R.sup.4 is alkyl of 1-6 C atoms and R.sup.5 is alkyl of 1-6 C atoms, and at least one 2-alkylthioxanthone of the formula ##STR2## wherein R.sup.6 is alkyl of 1-8 C atoms, have a considerably increased reactivity in initiating the photopolymerization of ethylenically unsaturated compounds. The polymers fully hardened using these initiator mixtures suffer only little yellowing.

Mixtures of aromatic-aliphatic ketones as photoinitiators and

Compounds of the formula ##STR1## wherein the substituents A, Z, R.sup.1, R.sup.2, R.sup.3, R.sup.4, X, n and m are defined hereinbelow

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Weiterstadt, Germany

Jurgen Eichler