Method for the preparation of organofunctional organopentasiloxane, organic resin modifier and organic resins

摘要

A method for preparaing of an organofunctional organopentasiloxane which finds utility as a modifier for organic resins is disclosed, said method comprising: (I) reacting (A) a cyclotrisiloxane and (B) an alpha , omega -dihydrogendiorganodisiloxane in the presence of an (C) acid catalyst to prepare an alpha , omega -dihydrogendiorganopentasiloxane having the formulaR2HSiO(R2SiO)3SiHR2 wherein R independently represents a monovalent group free of aliphatic unsaturation selected from hydrocarbon or halogenated hydrocarbon groups; and (II) running an addition reaction in the presence of (D) a hydrosilylation catalyst between said alpha , omega -dihydrogendiorganopentasiloxane and (E) an organic compound containing a monovalent group selected from epoxy or phenol groups as well as an unsaturated aliphatic hydrocarbon group. In a variation of the method, the alpha , omega -dihydrogendiorganopentasiloxane is reacted with (F) an organic compound bearing an unsaturated aliphatic hydrocarbon group as well as a monovalent group selected from triorganosilyl-protected amino, triorganosilyl-protected carboxyl, triorganosilyl-protected hydroxyl or triorganosilyl-protected phenol and the protective triorganosilyl groups are subsequently removed.