Rhone-poulenc Chimie

Rhodia Chimie

Pierre Barruel

Gerard Mignani

Christian Priou

Yves Bomal

Nathalie Guennouni

Daniel Ariagno

Alain Viale

The present invention relates to a process for preparing multifunctionalized polyorganosiloxanes (POSs) comprising alkoxyl functional siloxyl units and siloxyl units each having an SH functional group, which consists in introducing the SH functional group by the reaction of H S on a precursor POS of formula: A&mdash;(RXSiO) &mdash;(RYSiO) &mdash;B where R is especially a C -C alkyl radical, X is a C -C alkoxyl radical, Y is a C -C hydrocarbon group which includes an ethylenically unsaturated group from which the SH functionality derives, a is a number ranging from 1 to 150, b is a number ranging from 1 to 150, the number a&plus;b ranging from 2 to 300 and A and B are terminal groups which are selected respectively, from, in particular, on the one hand (R) SiO&mdash; radicals taken alone or as mixtures with (R) XSiO&mdash; and/or R(X) SiO&mdash; and/or (X) SiO&mdash; radicals and on the other hand &mdash;Si(R) radicals taken alone or as mixtures with &mdash;SiX(R) and/or &mdash;Si(X) R and/or &mdash;Si(X) radicals.

Method for preparing polyorganosiloxanes (POS) with thiol functions, POS obtainable by this method and their use particularly in rubber materials

Heat-vulcanizable silicone elastomer compositions, well adopted for conversion into mechanically strong flame-retardant protective sheathings/coatings for, e.g., electrical wires and cables, comprise (a) at least one polydiorganosiloxane polymer, (b) a reinforcing filler material and (c) a vulcanizing agent, e.g., an organic peroxide, therefor, and including a fireproofing and mechanical strength-enhancing amount of (d) mica and (e) zinc oxide.

Heat-vulcanizable organopolysiloxane compositions and protective

Growing community of inventors

Tassin la Demi Lune, France

Pierre Barruel