C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
C09D 5/44 (2006.01) C25D 13/06 (2006.01) C25D 13/10 (2006.01)
Patent
CA 2380628
A cathodic electrocoating composition comprises an aqueous carrier, a film forming binder, comprising an epoxy-amine adduct and a blocked polyisocyanate crosslinking agent, dispersed in the carrier, and a novel additive comprising the reaction product of (1) a polyoxy alkylene di or monoamine; (2) a glycidoxy alkyl alkoxy silane; and (3) a glycidyl compound selected from the group consisting of a glycidyl ester of a carboxylic acid and an alkyl glycidyl ether, which reaction product is hydrolyzed in the presence of acid and water to convert alkoxysilane moieties to silanol moieties. The electrocoat composition produces coatings having a smoother appearance with better edge coverage and fewer craters.
L'invention porte sur une composition pour revêtement électrolytique comportant: un support aqueux, un liant filmogène consistant en un adduit d'époxy-amine et d'un agent réticulant de polyisocyanate bloqués, dispersé dans le support et un nouvel additif comprenant le produit de réaction de: (1) un polyoxyalkylène di ou monoamine; (2) un glycidoxyalkylalkoxysilane; et (3) un composé de glycidyle choisi parmi un glycidylester d'un acide carboxylique et un alkylglycidyléther, ledit produit de réaction étant hydrolysé en présence d'acide et d'eau pour convertir les fragments d'alkoxysilane en fragments de silanol. Ladite composition donne des revêtements d'apparence plus lisse à meilleure couverture des angles et présentant moins de cratères.
Gam Allisa
E.i. Du Pont de Nemours And Company
Torys Llp
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