| abstract |
Compounds of the general formula I: (SIL-X-)mIN (I), in which SIL is a radical of the formula Si(R1)(R2)(R3), where R1 is an alkyl, haloalkyl or alkoxy radical of 1 to 8 carbon atoms, an alkenyl radical, an alkenyloxy or acyloxy radical of 2 to 8 carbon atoms, an aryl or aryloxy radical of 6 to 10 carbon atoms, or a dialkyl-, diaryl- or alkylaryl-methyleneaminooxy radical having C1-C4-alkyl or C6-aryl groups; and R2 and R3 are identical or different radicals with the meaning of R1 or X-IN; X is a group CnH2n; IN is the radical of a compound which is active as a photoinitiator or photosensitizer and which has at least one carbonyl group located on an aromatic nucleus; m is a number from 1 to 4; and n is a number from 2 to 12, or of the formula II: SioOo-1(-X-IN)pR42o+2-p (II), in which R4 is a radical with the meaning of R1, and two or more radicals R4 may be the same as or different from one another; o is a number from 2 to 20,000; and p is a number from 1 to o, and the symbols X and IN are as defined above, the group X being attached to an aromatic carbon atom which is positioned ortho to the carbonyl group of IN. The compounds are prepared by reacting a compound IN-H with a compound SIL-X' or a compound SioOo-1 (-X')pR42o+2-p in the presence of a ruthenium compound. They are suitable as radical-forming photoinitiators or as photosensitizers in silicone-containing photopolymerizable mixtures, in particular for the production of waterless-printing planographic printing plates. |