Initiator for polymerising and/or cross-linking...

C - Chemistry – Metallurgy – 08 – K

Patent

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Details

C08K 5/55 (2006.01) A61K 6/093 (2006.01) C08G 77/08 (2006.01) C08L 83/04 (2006.01)

Patent

CA 2389014

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)¿x?B(R')¿y?, wherein the symbols R' are the same or different and represent an alkyl or alkenyl radical in C¿1?-C¿12?, an alkoxy radical in C¿1?-C¿12?, 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¿3?, NO¿2?, CN group; and a radical -C¿2?H¿4?-Si(Q)¿3? with the symbols Q being the same or different and representing an alkyl or alkoxy group in C¿1? to C¿10? 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.

La présente invention a pour objet un amorceur de polymérisation et/ou de réticulation activable thermiquement, de monomères, oligomères et/ou de polymères de nature polyorganosiloxane à groupements organofonctionnels comprenant un dérivé du bore de formule (I): (A)x B(R')y dans laquelle les symboles R' sont identiques ou différents et représentent un radical alkyle ou alcényle en C1-C12, un radical alkoxy en C1-C12, un radical phényle substitué par au moins un élément électroattracteur, un radical aryle contenant au moins deux noyaux aromatiques tel que biphényle, naphtyle, éventuellement substitué par au moins un élément électroattracteur, notamment atome d'halogène (fluor tout particulièrement), ou un groupement électroattracteur notamment un groupement CF3, NO2, CN, un radical -C2H4-Si(Q)3 avec les symboles Q identiques ou différents représentant un groupe alkyle ou alkoxy en C1 à C10 ou un oligomère siloxane inférieur à 10 atomes de silicium. Elle vise également une composition réticulable correspondante et ses utilisations.

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