Patent ID: 6133394
Filing Date: 2000-10-17
Classification: C07F,C08G

Abstract:
A method for preparing an organofunctional organopentasiloxane having the formula ##STR41## said method comprising: (I) reacting(A) a cyclotrisiloxane having the formula ##STR42## (B) a disiloxane having the formulaR.sub.2 HSiOSiHR.sub.2in the presence of an(C) acid catalystto prepare an .alpha.,.omega.-dihydrogenorganopentasiloxane having the formulaR.sub.2 HSiO(R.sub.2 SiO).sub.3 SiHR.sub.2wherein R independently represents a monovalent group free of aliphatic unsaturation selected from the group consisting of hydrocarbon groups and halogenated hydrocarbon groups, A is selected from the group consisting of epoxy and phenol groups, and B represents a divalent organic group having at least 2 carbon atoms; and(II) running an addition reaction in the presence of (D) a hydrosilylation catalyst between said .alpha.,.omega.-dihydrogenorganopentasiloxane and (E) an organic compound containing a monovalent group selected from the group consisting of epoxy and phenol as well as an unsaturated aliphatic hydrocarbon group.