Low voc thermosetting composition of polyester acrylic resin...

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 283/01 (2006.01) C08F 290/06 (2006.01) C08F 290/14 (2006.01) C08L 67/06 (2006.01) C09D 151/08 (2006.01) C09D 167/06 (2006.01)

Patent

CA 2699710

The invention relates to low VOC resin composition, comprising a polyester acrylic polymer having two or more polymerizable carbon - carbon double bonds in each molecule and at least one polymerizable vinyl monomer. Low VOC thermoset-ting polyester acrylic resins are made by esterification reaction of an unsaturated epoxide such as glycidyl methacrylate, and of a polyacid which is the half-ester formed by reacting a polycarboxylic acid and/or its anhydride with a polyol. The obtained low viscosity resin composition, is useful for making a low or zero VOC gel coat or a molded composite with excellent hydrolytic and weather resistance.

L'invention concerne une composition de résine à faible teneur en COV, comprenant un polymère acrylique polyester comprenant deux doubles liaisons carbone-carbone polymérisables ou plus dans chaque molécule et au moins un monomère vinylique polymérisable. Les résines acryliques polyester à faible teneur en COV sont préparées par une réaction d'estérification d'un époxyde insaturé, comme le méthacrylate de glycidyle, et d'un polyacide qui est le semi-ester formé par réaction d'un acide polycarboxylique et/ou de son anhydride avec un polyol. La composition de résine à faible viscosité obtenue est utile pour préparer un enduit gélifié à teneur faible ou nulle en COV ou un composite moulé ayant une résistance excellente à l'hydrolyse et aux intempéries.

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