Electrodepositable coating composition containing bismuth...

C - Chemistry – Metallurgy – 09 – D

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C09D 5/44 (2006.01) C08G 18/16 (2006.01) C08G 18/64 (2006.01)

Patent

CA 2264704

An electrodepositable coating composition is provided comprising (a) an active hydrogen-containing, cationic salt group-containing resin electrodepositable on a cathode; (b) a curing agent for transurethanation, transamidation or transesterification curing like at least a partially capped polyisocyanate curing agent; and (c) a catalytic mixture of bismuth and an amino acid or amino acid precursor. Optionally, an auxiliary acid may be present to increase the effectiveness of the amino acid in the mixture with bismuth.

On décrit une composition de revêtement par dépôt électrolytique comprenant (a) une résine contenant un hydrogène actif et un groupe de sel cationique et pouvant être déposée par électrolyse, (b) un agent de durcissement destiné à durcir par transuréthanation, transamidation ou transestérification, comme au moins un agent de durcissement du type polyisocyanate partiellement coiffé, et (c) un mélange catalytique de bismuth et d'un acide aminé ou d'un précurseur d'acide aminé. Le cas échéant, on peut ajouter un acide supplémentaire afin d'augmenter l'efficacité de l'acide aminé dans le mélange avec le bismuth.

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