| 摘要 |
The invention relates to a process for preparing organosilicon group containing photoinitiators of the formula (I), wherein m is a number from 1 to 200; q is 0 or 1; A is IN-C(O)-O-CHR<SUB>3</SUB>-Y- or IN-C(O)-NH-CHR<SUB>3</SUB>-Y-; A' is A or R<SUB>1</SUB>'; R<SUB>1 </SUB>and R<SUB>1</SUB>', R<SUB>2 </SUB>and R<SUB>2</SUB>' are C<SUB>1</SUB>-C<SUB>18</SUB>alkyl or phenyl, or -(O)<SUB>q</SUB>-SiR<SUB>1</SUB>R<SUB>1</SUB>'R<SUB>2</SUB>; R<SUB>3 </SUB>is hydrogen or C<SUB>1</SUB>-C<SUB>6</SUB>alkyl, Y is a divalent group selected from C<SUB>1</SUB>-C<SUB>10</SUB>alkeylene, C<SUB>2</SUB>-C<SUB>10</SUB>alkenylene or -(CH<SUB>2</SUB>)<SUB>b</SUB>-O-(CH<SUB>2</SUB>)<SUB>a</SUB>-; and b are each independently of the other a number of 1 to 6; IN is a photolabile functional moiety of the formula (II) or (III), wherein R<SUB>4 </SUB>is hydrogen or -C(O)-C(O)-OH or -C(O)-C(O)-OC<SUB>1</SUB>-C<SUB>6</SUB>alkyl and n is 1-3; R<SUB>5 </SUB>and R<SUB>6 </SUB>are C<SUB>1</SUB>-C<SUB>1-2</SUB>alkyl or together are cycloC<SUB>5</SUB>-C<SUB>7</SUB>alkyl; R<SUB>7 </SUB>is hydroxy, C<SUB>1</SUB>-C<SUB>6</SUB>alkoxy or morpholinyl; X is -(CH<SUB>2</SUB>)<SUB>a</SUB>-, -(CH<SUB>2</SUB>)<SUB>b</SUB>-O-(CH<SUB>2</SUB>)<SUB>a</SUB>- or -(CH<SUB>2</SUB>)<SUB>b</SUB>-O-CO-(CH<SUB>2</SUB>)<SUB>a</SUB>-; a and b are each independently of the other a number of 1 to 6; whereby the process is characterized in that a photolabile functional moiety containing a carboxy group (IN-COOH) or an alkoxycarbonyl group (IN-CO-OC<SUB>1</SUB>-C<SUB>6</SUB>alkyl) is reacted with a carbinol- or amino terminated organosilicon compound of the formula (IV), wherein m, R<SUB>1 </SUB>and R<SUB>1</SUB>', R<SUB>2 </SUB>and R<SUB>2</SUB>' are as defined above and B is -Y-CHR<SUB>3</SUB>-OH or -Y-CHR<SUB>3</SUB>-NH<SUB>2</SUB>; B' is B or R<SUB>1</SUB>', in the presence of an enzyme which catalyzes the esterification, transesterification or amidation reaction.
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