Method for manufacturing reactive polysiloxane solution

A method for producing a reactive polysiloxane solution, comprising:

• synthesizing a reactive polysiloxane of formula (1) by subjecting a raw material comprising an organosilicon compound, which comprises a siloxane bond-forming group and a reactive functional group selected from the group consisting of a (meth)acryloyl group and an oxetanyl group, to hydrolysis and copolycondensation,
• dissolving the reactive polysiloxane in an organic solvent for water washing, thereby obtaining a resultant organic solution, and
• bringing the resultant organic solution into contact with water to obtain a mixed liquid, and removing a water layer from the mixed liquid to collect an oil layer comprising the reactive polysiloxane, thereby obtaining the reactive polysiloxane solution,
• wherein
• the organic solvent for water washing comprises a hydroxyl group, and has a boiling point at a pressure of 1 atm of from 110° C. to 200° C. and a solubility in 100 g of water at a temperature of 20° C. of 10 g or less,
• wherein
• R0 is an organic group of formula (2) or an organic group of formula (3),
• R1 is an organic group that comprises a functional group comprising 1 to 10 carbon atoms,
• R2, R3, and R4 are independently a hydrogen atom or a hydrocarbon group comprising 1 to 10 carbon atoms,
• R5 is a hydrocarbon group comprising 1 to 6 carbon atoms,
• n is 0 or 1, and
• a, w, x, y, and z are independently a number of moles, with the proviso that w is a positive number, a, x, y, and z are independently 0 or a positive number, 0≦a/w≦3, 0≦x/(a+w)≦2, 0≦y/(a+w)≦2, and 0≦z/(a+w+x+y)≦1,
• wherein R6 is a hydrogen atom or a methyl group, and R7 is an alkylene group comprising 1 to 6 carbon atoms,
• wherein R8 is a hydrogen atom or an alkyl group comprising 1 to 6 carbon atoms, and R9 is an alkylene group comprising 1 to 6 carbon atoms.