Manufacture of unsymmetric monoacetals of aromatic 1,2-diketones employable as photoiniatiators
AssigneeBASF SE
InventorsWerner Kuesters, Manfred Jacobi, Rolf Osterloh
Life of this patent
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Abstract
Unsymmetrical monoketals of aromatic 1,2-diketones ##STR1## wherein R.sup.1 and R.sup.2 are different radicals, are manufactured by reacting the corresponding aromatic 1,2-diketones, in an organic solvent, with an acid ester (R.sup.1).sub.n X as alkylating agent and an alcoholate (R.sup.2 O).sub.m Me, where n and m are integers from 1 to 3, X is an acid radical and Me is a metal of main groups 1 to 3 of the periodic table of the elements. The resulting diketone monoacetals are particularly suitable for use as photoinitiators in photopolymerizable compositions.
Claims8
In a composition photopolymerizable with UV radiation and containing a compound having at least one polymerizable carbon-carbon double bond and further containing a photoinitiator, the improvement which comprises;
- using as the photoinitiator an unsymmetric monoketal of an aromatic 1,2-diketone of the formula ##STR4## where A.sup.1 and A.sup.2 are identical or different aromatic radicals each of which having from 6 to 12 carbon atoms which are either unsubstituted or which may bear from one of four substituents selected from the group consisting of hydrocarbon radicals having 1 to 10 carbon atoms, alkoxy radicals having 1 to 10 carbon atoms, alkoxyalkyl radicals having 2 to 10 carbon atoms, alkylthio radicals having 1 to 6 carbon atoms and/or halogen and R.sup.1 and R.sup.2 are hydrocarbon radicals of 1 to 12 carbon atoms in which the chain may or may not be interrupted by --O-- or --S-- or bear a halogen, said radicals R.sup.1 and R.sup.2 being characterized in that they differ one from another.
Dependencies are inferred from the claim text.