Alkyd resins having a low dynamic viscosity for use in...

C - Chemistry – Metallurgy – 08 – G

Patent

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C08G 63/49 (2006.01) C08G 63/48 (2006.01) C09D 167/08 (2006.01)

Patent

CA 2250396

The current invention relates to an alkyd resin particularly useful in high- solids coating compositions. The alkyd resin comprises the reaction product of an unsaturated fatty acid, a polyol, and the adduct of an .alpha.,.beta.- unsaturated dicarboxylic acid to an unsaturated fatty acid, wherein the resin contains a) about 5 to about 40 weight % of the adduct of an .alpha.,.beta.- unsaturated dicarboxylic acid to an unsaturated fatty acid, b) about 50 to about 90 weight % of an unsaturated fatty acid which is not part of an adduct, c) about 8 to about 18 weight % of a polyol free from carboxylic groups, d) about 1 to about 30 weight % of an at least two hydroxyl groups-containing monocarboxylic acid, e) optionally, up to about 10 weight % of a dicarboxylic and/or a tricarboxylic acid, and f) optionally, up to about 15 weight % of one or more monomers other than the monomers (a) through (e). Also disclosed is their use in coating compositions, particularly high-solids coating compositions having a VOC of less then 170.

L'invention porte sur une résine alkyde particulièrement utile dans les revêtements à haute teneur en solides. Ladite résine comporte: le produit de réaction d'un acide gras non saturé, un polyol, et le produit d'addition d'un acide .alpha.-.beta.-dicarboxylique non saturé à un acide gras non saturé. Ladite résine comprend: (a) d'environ 5 à environ 40 % en poids du produit d'addition d'un acide .alpha.-.beta.-dicarboxylique non saturé à un acide gras non saturé; (b) d'environ 50 à environ 90 % en poids d'un acide gras non saturé ne faisant pas partie d'un produit d'addition; (c) d'environ 8 à environ 18 % en poids de polyol exempt de groupes carboxyliques; (d) d'environ 1 à environ 30 % en poids d'un acide monocarboxylique comportant au moins deux groupes hydroxyle; (e) facultativement jusqu'à environ 10 % en poids d'un acide dicarboxylique et/ou tricarboxylique; et (f) facultativement jusqu'à environ 15 % en poids d'un ou de plusieurs monomères autres que les monomères (a) à (e). L'invention porte également sur l'utilisation de ces résines dans des compositions pour revêtements, en particulier des compositions du type à haute teneur en solides, présentant un COV inférieur à 170.

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