Coating composition comprising an oxidatively drying...

C - Chemistry – Metallurgy – 08 – G

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C08G 75/04 (2006.01) C09D 181/00 (2006.01)

Patent

CA 2394838

Coating composition and its use in a one-pot system. The coating composition comprises: an oxidatively drying polyunsaturated condensation product, such as an alkyd, having pendant groups in an amount of more than 20 % by weight of the condensation product, the pendant groups comprising unsaturated CC bonds; a polythiol having two or more SH-groups; a siccative. The equivalence ratio of thiol functional groups to unsaturated CC bonds being less than 0,3, preferably between 0,01 and 0,25. The coating composition comprises 1 - 30 wt- %, preferably 3 - 20 wt-%, of thiol compounds, related to the total weight of solid resin. The coating composition further comprises a drying accelerating complexing agent, preferably 2,2'-bipyridyl or 1,10-phenantroline.

La présente invention concerne une composition de revêtement et son utilisation dans un système à récipient unique. La composition de revêtement de l'invention comprend : un produit de condensation polyinsaturé séchant par oxydation, tel qu'une résine alkyde, comprenant des groupes latéraux en quantité supérieure à 20 % en poids du produit de condensation, les groupes latéraux comprenant des liaisons CC insaturées ; un polythiol renfermant au moins deux groupes SH- ; un siccatif. Le coefficient d'équivalence des groupes fonctionnels thiols et des liaisons CC insaturées est inférieur à 0,3, et il est de préférence compris entre 0,01 et 0,25. La composition de revêtement de l'invention comprend entre 1 et 30 % en poids, et de préférence entre 3 et 20 % en poids de composés thiols, par rapport au poids total de la résine solide. La composition de revêtement comprend en outre un agent complexant accélérant le séchage, de préférence un 2,2'-bipyridyle ou une 1,10-phénantroline.

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