Alternatively,precipitation can be brought about from the homogeneous solution of the copolymer in the polymerization medium by adding a nonsolvent for the organic silicone copolymer.In the case of polymerization in solution it is possible to use organic solvents such as tetrahydrofuran (THF), diethyl ether, petroleum ether, methyl acetate, ethyl acetate, methyl ethyl ketone, acetone, isopropanol,