Initiators for the cationic crosslinking of polymers...

C - Chemistry – Metallurgy – 08 – K

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C08K 5/00 (2006.01) C08G 59/32 (2006.01) C08G 59/68 (2006.01) C08L 83/06 (2006.01) C09D 183/06 (2006.01) D21H 19/32 (2006.01) D21H 27/00 (2006.01) G03F 7/004 (2006.01)

Patent

CA 2248778

The present invention relates to initiators for the polymerization and/or crosslinking, cationically and under photochemical and/or thermal activation and/or activation by a beam of electrons, of monomers and/or polymers containing organofunctional groups. The said initiators are of the type comprising an onium salt of an element from groups 15 to 17 of the Periodic Table (Chem & Eng News, Vol 63, N5, 26, of 4 February 1985) and they are characterized in that they contain at least one polymerization and/or crosslinking accelerator chosen from .alpha.-hydroxylated carboxylic acid esters such as, for example, lactic acid esters. Another subject of the invention is compositions based on at least one cationically crosslinkable polyorganosiloxane and on at least one initiator. Application in particular: paper antiadhesion.

Cette invention concerne des initiateurs de polymérisation et/ou de réticulation de monomères et/ou de polymères contenant des groupes fonctionnels organiques, lesquelles polymérisation et réticulation s'effectuent de manière cationique, par activation photochimique et/ou thermique, et/ou par activation à l'aide d'un faisceau d'électrons. Ces initiateurs appartiennent au type de ceux qui comprennent un sel onium d'un élément choisi dans les groupes 15 à 17 de la table de classification périodique (Chem & Eng News, Vol 63, N5, 26 du 4 février 1985). Ces initiateurs se caractérisent par le fait qu'ils contiennent au moins un accélérateur de polymérisation et/ou de réticulation choisi parmi des esters d'acide carboxylique .alpha.-hydroxylé, par exemple, des esters d'acide lactique. Cette invention concerne également des compositions qui comprennent au moins un polyorganosiloxane réticulable de manière cationique, et au moins un initiateur. Ces composés sont particulièrement utiles dans des applications de prévention d'adhésion dans l'industrie du papier.

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