Coating composition for optical plastic moldings

Details Coating composition for optical plastic moldings Coating composition for optical plastic moldings

C - Chemistry, Metallurgy

09

D

C09D 183/04 (2006.01) C09D 183/06 (2006.01) C09D 183/14 (2006.01) G02B 1/10 (2006.01)

Patent

CA 2071692

A coating composition that can be applied to optical plastic moldings having a high refractive index, to protect them from deterioration by light without any adverse effect on their optical functions. The coating composition contains the following essential constituents. (A) 1 part of a hydrolyzate of a silane compound; (B) 0.2-5 parts of titanium oxide-based composite fine particles having a particle diameter of 1-100 nm in which titanium oxide integrally combines with iron oxide, with the ratio of iron oxide to titanium oxide being 0.005-0.15 by weight; (C) 0.02-0.5 part of an unsaturated or saturated polycarboxylic acid or an anhydride thereof; and (D) 0.01-0.2 part of a heat-curing catalyst.

Composition de revêtement pouvant être appliquée sur des pièces optiques moulées en plastique, à haut indice de réfraction, pour les protéger contre la détérioration par la lumière, sans altérer leurs fonctions optiques. La composition de revêtement renferme les constituants fondamentaux suivants : A) 1 partie d'un hydrolysat de silane; B) 0,2-5 parties de fines particules mixtes à base d'oxyde de titane, d'un diamètre de 1-100 nm, dans lesquelles l'oxyde de titane est intégralement combiné avec l'oxyde de fer, le rapport pondéral oxyde de fer sur oxyde de titane se situant dans une plage de 0,005-0,15; C) 0,02-0,5 partie d'un acide polycarboxylique, saturé ou insaturé, ou un anhydride de cet acide; D) 0,01-0,2 partie d'un catalyseur thermoréticulable.

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