| 摘要 |
This invention relates to sulfur containing polysiloxane polymers having units of the general formula (M)x(T')y wherein M represents an R3SiO0.5 unit in which R is a monovalent hydrocarbon radical or a halogenated monovalent hydrocarbon radical having from 1 to 18 carbon atoms, T' represents a unit of the formula (R''S)zR'SiO1.5 in which R' is a divalent, trivalent or tetravalent hydrocarbon radical having from 2 to 18 carbon atoms or divalent, trivalent or tetravalent hydrocarbon radicals having at least one -C-S-C- group, R'' is hydrogen or R, x and y each represent a number greater than 1 and up to 20,000, in which the ratio of x to y may vary from 1:0.33 to 0.005:1 and z is 1, 2 or 3. These sulfur containing polysiloxane polymers are prepared by reacting in the presence of an acid catalyst a mixture containing (1) a hexaorganodisiloxane and (2) a silicon compound having the formula (R''S)zR'Si(OR)3 in which R, R' and R'' are the same as above.
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