Stable, low cure-temperature semi-structural pressure...

C - Chemistry – Metallurgy – 09 – J

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C09J 4/00 (2006.01) C09J 4/06 (2006.01)

Patent

CA 2203400

A curable pressure sensitive adhesive having long shelf stability comprising: (1) at least one free radically polymerized polymer; (2) at least one cationically-polymerizable monomer; (3) a photo-activatable catalyst system for the cationically-polymerizable monomer comprising either at least one organometallic complex salt or at least one onium salt; and (4) optionally, a monohydric or polyhydric alcohol, wherein there is essentially no conversion of the cationically-polymerizable monomer of the curable pressure sensitive adhesive when stored in a manner to exclude actinic radiation, and methods of making the same.

L'invention traite d'un adhésif autocollant durcissable, à longue durée de conservation, constitué: 1) d'au moins un polymère à polymérisation radicalaire; 2) d'au moins un monomère polymérisable par voie cationique; 3) d'un système catalytique photo-activable pour le monomère polymérisable par voie cationique, comprenant au moins un sel de complexe organométallique ou au moins un sel d'onium; et 4) éventuellement un monoalcool ou un polyalcool. Il n'y a pas de conversion notable du monomère polymérisable par voie cationique de l'adhésif autocollant durcissable lorsqu'il est stocké de manière à empêcher toute exposition à une radiation actinique. L'invention traite également d'un procédé de fabrication de ce produit.

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