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

US6743883B1 · kind B1 · utility

Assignee

• RHODIA CHIMIE · FR

Inventors

• Jean-Marc Frances · Meyzieu, FR
• Thomas Deforth · Val-de-Reuil, FR

Key dates

• Filing date: Apr 25, 2002
• Grant date: Jun 1, 2004
• Expiry date: Apr 25, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G77/08
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

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)xB(R′)y, wherein the symbols R′ are the same or different and represent an alkyl or alkenyl radical in C1-C12, an alkoxy radical in C1-C12, 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 CF3, NO2, CN group; and a radical —C2H4—Si(Q)3 with the symbols Q being the same or different and representing an alkyl or alkoxy group in C1 to C10 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.