Process for producing solvent-soluble reactive polysiloxanes

摘要

The present invention is a method for producing solvent-soluble polysiloxanes which includes a condensation process of subjecting a raw material having siloxane-bond-forming groups to hydrolytic copolycondensation in the presence of a catalyst to synthesize a reactive polysiloxane represented by general formula (1), the raw material containing both an organosilicon compound (S1) having a (meth)acryloyl group and siloxane-bond-forming groups and at least one silicon compound (S2) selected from among tetraalkoxysilanes and tetrahalogenosilanes, wherein in the condensation process, the organosilicon compound (S1) and silicon compound (S2) are used at a (S2)/(S1) molar ratio of 1.8 or less, and the condensation process is conducted by adding gradually a mixture of the silicon compound (S2) and the catalyst to a raw material liquid containing the organosilicon compound (S1) and water, while keeping the molar ratio of the amount of the silicon compound (S2) to the amount of the organosilicon compound (S1) within the range of 0.001/min to 0.3/min.

主权项

1. A method for producing a solvent-soluble reactive polysiloxane, the method comprising: subjecting a raw material having a siloxane bond-forming group to hydrolysis and copolycondensation in the presence of a catalyst to synthesize a reactive polysiloxane of formula (1), wherein R0 is an organic group of formula (2), R1 is an organic group comprising a functional group having 1 to 10 carbon atoms, R2, R3, and R4 are each independently a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms, R5 is a hydrocarbon group having 1 to 6 carbon atoms, R6 is a hydrogen atom or a methyl group, R7 is an alkylene group having 1 to 6 carbon atoms, n is 0 or 1, a, w, x, y, and z are each independently a number of moles, w is a positive number, x, y, and z are each independently 0 or a positive number, 0≦a/w≦1.8, 0≦x/(a+w)≦2, 0≦y/(a+w)≦2, 0≦z/(a+w+x+y)≦1, and, the raw material comprises: an organosilicon compound (S1) of formula (5), wherein R11 is a siloxane bond-forming group and R0 and R1 are as defined in formula (1); and a silicon compound (S2) selected from the group consisting of a tetraalkoxysilane and a tetrahalogenosilane, wherein the organosilicon compound (S1) and the silicon compound (S2) have a molar ratio (S2)/(S1) of 1.8 or less, the subjecting is conducted while gradually adding a mixture of the silicon compound (S2) and the catalyst to a raw material liquid comprising the organosilicon compound (S1) and water, and the mixture of the silicon compound (S2) and the catalyst is added while keeping a molar ratio of an amount of the silicon compound (S2) to an amount of the organosilicon compound (S1) within 0.001/min to 0.3/min, wherein when x is a positive number, said raw material further comprises a silane compound having two siloxane bond-forming groups and when y is a positive number, said raw material further comprises a silane compound having one siloxane bond-forming group.