Resin composition for cationic electrodeposition coating

Details Resin composition for cationic electrodeposition coating Resin composition for cationic electrodeposition coating

C - Chemistry, Metallurgy

09

D

C09D 5/44 (2006.01) C08G 18/10 (2006.01) C09D 163/00 (2006.01)

Patent

CA 2205695

Disclosed herein is a resin composition for cationic electrodeposition coating containing (A) an epoxy resin (a base resin) having cationic groups and (B) a blocked polyisocyanate (a curing agent), characterized in that, a blocked polyisocyanate (B) in which a part of the isocyanate groups is polymerized with a polyol and which is blocked by (1) a blocking agent represented by a formula R-(OC2H3X)n-OH (wherein R is an alkyl having 1-6 carbon atom(s); X is H or methyl; and n is 1-6) and having a molecular weight of not less than 150 and also by (2) another blocking agent having a deblocking temperature of not higher than about 150°C is used.

Ci-inclus est une composition de résine pour le revêtement par électrodéposition cationique, qui comprend (A) une résine époxy (résine de base) ayant des groupes cationiques et (B) un polyisocyanate bloqué (agent de traitement) caractérisé en ce qu'un polyisocyanate bloqué (B) est employé, chez lequel une partie des groupes isocyanate est polymérisée par un polyol, et qui est bloqué par (1) un agent bloquant représenté par une formule R-(OC2H3X)n-OH (dans laquelle R est un alkyl ayant de 1 à 6 atome(s) de carbone; X est H ou méthyle; et n est un chiffre de 1 à 6, et qui a un poids moléculaire de 150 ou plus, et aussi par (2) un deuxième agent bloquant ayant une température de déblocage qui ne dépasse pas les 150 degrés.C.

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