Abrasion-resistant tintable coating

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 4/00 (2006.01) G02B 1/04 (2006.01)

Patent

CA 2750463

The present invention provides a curable coating composition comprising: a) at least one monomer chosen from polyol poly (meth) acrylate monomers having from 3 to 6 (meth) acrylate functions, b) at least one monomer chosen from polyol polyglycidyl ethers having at least three epoxy functions, c) at least one dysfunctional monomer, d) at least one free-radical photo-initiator, and e) at least one cationic photo-initiator, wherein the molar ratio of acrylate equivalents to epoxy equivalents in the composition ranges from 3:1 to 4:1, and wherein the composition is free of silica and of monomers bearing a silane function. It also provides a method for coating a substrate, such as an ophthalmic lens, with this composition, and to the coating substrate thus obtained.

La présente invention concerne une composition de revêtement durcissable comprenant : a) au moins un monomère choisi parmi des monomères de poly(méth)acrylate de polyol ayant de 3 à 6 fonctions (méth)acrylate, b) au moins un monomère choisi parmi des éthers de polyglycidyle de polyol ayant au moins trois fonctions époxy, c) au moins un monomère dysfonctionnel, d) au moins un photo-initiateur de radical libre, et e) au moins un photo-initiateur cationique, caractérisée en ce que le rapport molaire des équivalents d'acrylate aux équivalents d'époxy dans la composition est dans la plage de 3:1 à 4:1, et caractérisée en ce que la composition est exempte de silice et de monomères comportant une fonction silane. Elle concerne en outre un procédé pour revêtir un substrat, tel qu'une lentille ophtalmique, avec cette composition, et le substrat de revêtement ainsi obtenu.

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