Initiator for polymerizing and/or cross-linking polyorganosiloxanes with cross-linkable functional groups, corresponding compositions and their uses

Abstract

The invention relates to a heat-activated initiator for polymerising and/or cross-linking polyorganosiloxane-type monomers, oligomers and/or polymers with organofunctional groups, comprising a boron derivative of formula (I): (A) B(R′) , wherein the symbols R′ are the same or different and represent an alkyl or alkenyl radical in C -C , an alkoxy radical in C -C , a phenyl radical substituted by at least one electroattractor element, an aryl radical containing at least two aromatic rings such as biphenyl, naphthyl, optionally substituted by at least one electroattractor element, especially a halogen atom (particularly fluorine), or an electroattractor group, especially a CF , NO , CN group; and a radical —C H —Si(Q) with the symbols Q being the same or different and representing an alkyl or alkoxy group in C to C or a siloxane oligomer with less than 10 silicon atoms. The invention also relates to a corresponding cross-linkable composition and to the uses thereof.