| abstract |
A process for the production of modified polymers, preferable in organic solvents, by radical-initiated polymerization of (Ia) 70 to 99.9 parts by weight of esters of the formula CH2=C(R)-COOR'(Ia) IN WHICH R is -H or -CH3 and R' are 1 to 18 C-alkyl radicals, at least 50% by weight of the esters of (Ia) being those in which R' are 1 to 4 C-alkyl radicals, (Ib) 0, 1 to 20 parts by weight of omega -hydroxyalkyl esters of acrylic, methacrylic, maleic and/or fumaric esters, the said dicarboxylic acids are possibly etherified on the second carboxylic group with 1 to 12 C-atoms containing alcohols and (Ic) 0 to 10 parts by weight of other unsaturated monomers, the sum of (Ia), (Ib) and (Ic) amounting to 100 parts by weight, in the presence of (II) 5 to 40 parts by weight of terminal blocked alkyl-hydrogen polysiloxanes, the alkyl radicals containing 1 to 4 carbon atoms, with a viscosity of 20 to 1000 cP at 20 DEG C., the ratio of alkyl radicals to hydrogen atoms thereof being from 13 : 1 to 1 : 1, in which ratios the terminal groups are not included. Organic solvents containing the obtained modified polymers and usual curing agents for alkyl-hydrogen polysiloxanes are useful for treating fibrous material to give water-tight and water-repellent effects. |