Bluestar Silicones France Sas

Fernande Boisson

Gérard Mignani

Lucile Gambut

The invention provides a method for preparing functionalized polyorganosiloxane resins (POS) comprising units M: (RSiO), Q: (SiO) and M': (YRSiO) and optionally D: (RSiO) and/or D&#x2032;: (RYSiO) and T: (RSiO) and/or T&#x2032;: (YSiO), wherein in said units R is C-C, alkyl or C-C, aryl and Y is a functional group (such as Si&#x2014;H), by redistributing POS resins, using POSf bearing functional groups M&#x2032; and/or D&#x2032; and/or in the presence of an acid catalyst such as triflic acid or one of its derivatives and a non-basic inert filler: carbon black, diatomaceous earth, zeolite or acid or neutral oxide (AlO, NaO, TiO, MgO, silica). The invention also provides said catalyst system.

Process for preparing functionalized polyorganosiloxane resins by redistribution in the presence of triflic acid and/or of at least one derivative thereof and of a nonbasic filler

The present invention relates to a process for preparing functionalized polyorganosiloxane (POS) resins comprising units M: (RSiO), Q: (SiO) and M': (YRSiO) and optionally D: (RSiO) and/or D&#x2032;: (RYSiO) and T: (RSiO) and/or T&#x2032;: (YSiO), with, in these units: R=C-Calkyl or a C-Caryl and Y a functional group (e.g.: Si&#x2014;H), by redistribution of POS resins using POSf bearing functional units M&#x2032; and/or D&#x2032; and/or in the presence of an acid catalyst of the trifluoromethane-sulfonimide (TFSI) type. The present invention also relates to the aforementioned catalyst system.

Growing community of inventors

Villeurbanne, France

Fernande Boisson