Patent ID: 7402647
Filing Date: 2008-07-22
Classification: C08G

Abstract:
1. A process for preparing functionalized polyorganosiloxane (POS) resins comprising units M: (R 3 SiO 1/2 ), Q: (SiO 4/2 ) and M′: (Y a R 3-a SiO 1/2 ) and optionally D: (R 2 SiO 2/2 ) and/or D′: (RYSiO 2/2 ) and T: (RSiO 3/2 ) and/or T′: (YSiO 3/2 ), wherein: said process comprising conducting a redistribution reaction between a POS resin and a POSf compound bearing functional units M′ and/or D′ and/or T′, as defined above, in the presence of an acid catalyst, wherein at least one catalyst has formula (I) below: wherein: m is an integer greater than or equal to 1; and n is an integer equal to 1 or 2 and A represents NH (i) n=1 and A=NH (ii) n=2and A=NH; wherein the redistributed and functionalized resin obtained is subjected to at least one other redistribution/functionalization, using POSfs bearing functional units.