Polymethacrylic acid ester-polysiloxane block copolymers, their preparation and use as modifier and paint additive

摘要

Polymethacrylic acid ester-polysiloxane block copolymers of the general formula IMAGE where the radicals R 1: are identical or different in the molecule and are alkyl radicals having 1 to 18 carbon atoms or phenyl radicals, but at least 90% of the radicals R 1 are methyl radicals, R 2: hydrogen or polymethacrylic acid ester Residues of the general formula IMAGE are in which the residues; R³: are the same or different and are alkyl radicals with 1 to 8 carbon atoms, perfluoroalkyl radicals or alkylamino radicals, the nitrogen atom (s) of which may or may not be protonated or quaternized, R 4: the radical of a chain regulator known per se, without active hydrogen atoms is, a: is a number which is on average = 3, with the proviso that at least one radical R² has the meaning of the polymethacrylic acid ester radical, n: in each case a numerical value from 1 to 500, m: a numerical value from 0 to 10 and; p: has a numerical value from 3 to 12. The invention further relates to a process for the preparation of the block copolymers and their use as modifiers for poly (meth) acrylates and as additives for lacquers dissolved in organic solvents.