Oxidatively drying coating composition comprising a polythiol

Details Oxidatively drying coating composition comprising a polythiol Oxidatively drying coating composition comprising a polythiol

C - Chemistry, Metallurgy

09

D

C09D 167/08 (2006.01) C08J 3/28 (2006.01) C08K 5/37 (2006.01) C08K 5/5397 (2006.01) C09D 191/02 (2006.01)

Patent

CA 2371636

Coating composition comprising: a) one or more thiol compounds; b) one or more oxidatively drying polyunsaturated condensation products of one or more fatty acids and/or esters, one or more polyols and optionally one or more polycarboxylic acids and/or anhydrides of polycarboxylic acids and optionally other building blocks; c) and one or more photo-initiators. The ratio between the number of unsaturated groups and the number of SH-functional groups is preferably between 2:1 and 20:1. Preferably, the photoinitiator is a mono-, bis- or trisacyl phosphine oxide or a mixture thereof. The coating composition according to the invention can be used as one component coating system, preferably as a high solids coating composition, comprising 0 - 30 wt. % solvents, or as an aqueous coating composition.

L'invention concerne une composition de revêtement contenant a) au moins un composé thiol, b) au moins un produit de condensation poly-insaturé à séchage oxydatif d'au moins un acide gras et/ou un ester, au moins un polyol et, éventuellement, au moins un acide polycarboxylique et/ou des anhydrides d'acides polycarboxyliques et, éventuellement, d'autres éléments constitutifs, et c) au moins un photo-initiateur. Le rapport nombre de groupes insaturés/nombre de groupes fonctionnels SH est, de préférence, compris entre 2:1 et 20:1. Le photo-initiateur est de préférence un oxyde de phosphine mono-, bis-, ou trisacyl ou un mélange de ces derniers. La composition de revêtement de la présente invention peut s'utiliser comme système de revêtement à composant unique, de préférence comme composition de revêtement à haute teneur en solides, contenant de 0 à 30 % poids de solvants, ou comme composition de revêtement aqueuse.

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