Patent ID: 8907039
Filing Date: 2014-12-09
Classification: C08G

Abstract:
1. A method for preparing (hydroxymethyl)polysiloxanes having lateral hydroxymethyl groups of the formula Ib comprising reacting silanol-containing organosiloxanes of the formula IIa, with compounds of the formula IIIa where n is greater than zero, α is an integer from 2 to 20,000, β is an integer from 1 to 10,000, R R R X is a group R Y is hydrogen, an acyl group, a silyl group, a siloxanyl group, or is a bond together with X, R Q Q wherein the quantitative ratio of compounds of the formula IIa to compounds of the formula IIIa is selected such that the quantitative ratio of silanol groups in formula IIa less the two residual terminal silanol groups in the compounds of the formula Ib, to the quantitative ratio of the [SiR 12 (OR 13 )—CH 2 —O] units in formula IIIa, based on the number n of occurrences thereof in formula IIIa, is 1.6 to 2.4.