Water-based coating compositions and coating method using...

C - Chemistry – Metallurgy – 09 – D

Patent

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C09D 167/00 (2006.01) B05D 1/36 (2006.01) B05D 7/16 (2006.01) C09D 167/04 (2006.01) C09D 167/08 (2006.01)

Patent

CA 2225085

A water-based thermosetting coating composition comprises a polyester resin having a number of pendant carboxyl groups and a crosslinker for the resin both dispersed in an aqueous medium containing a neutralizing base. The polyester resin contains as polyester-forming polyhydric alcohol reactants from 1 to 40 % by weight of the entire polyester-forming reactants of a polyalkadienediol or a hydrogenated products thereof and from 2 to 50 % by weight of the entire polyester-forming reactants of a 2,2-bis(hydroxymethyl)alkanoic acid. The coating composition is useful for forming a multilayer coating film on metallic substrates such as automobile bodies by applying the coating composition as an intermediate coating layer between an electrodeposition coating layer and a top coating layer.

Une composition de revêtement thermodurcissable à base d'eau renferme une résine de polyester avec un certain nombre de groupes carboxyles et un réticulant pour la résine, tous étant dispersés dans un milieu aqueux contenant une base neutralisante. Comme réactifs formant le polyester, la résine renferme 1 à 40 % en poids d'un polyalcadiènediol ou d'un de ses produits hydrogénés et 2 à 50 % en poids d'un acide 2,2-bis(hydroxyméthyl)alcanoïque. La composition de revêtement est utile pour former une pellicule de revêtement multicouche sur des substrats métalliques, comme les carrosseries d'automobiles, par application de la composition comme couche intermédiaire entre une couche d'électrodéposition et une couche de revêtement supérieure.

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