| 摘要 |
<p>There is disclosed a method for preparing a diorganopolysiloxane having a functional group at only one end of the molecular chain and having the formula, R(R2SiO)pB, wherein R is an independently selected monovalent hydrocarbon group, B is selected from hydrogen atom or an organosilyl group having the formula, -SiR2R' in which R is as defined above, R' is selected from hydrogen atom or an organic functional group and p is an integer having a value of at least 1, said method comprising: (I) polymerizing (A) a cyclic trisiloxane, using (C) a lithium compound catalyst, said polymerization reaction taking place in the presence of (D) a compound selected from a nitrile compound or an ester compound and (E) a polar solvent which does not contain activated hydrogen; and (II) terminating the nonequilibrium polymerization reaction product obtained from step (I) using (F) a compound selected from an acid or an organohalogenosilane.</p> |
