Electrodepositable coating composition

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 5/44 (2006.01) C09D 163/00 (2006.01) C09D 175/04 (2006.01)

Patent

CA 2128843

This invention provides a cationic electrodepositable coating composition comprising: (A) 30 to 1% by weight of a high-molecular-weight polyurethane resin prepared by reacting (a) an organic polyisocyanate, (b) a high-molecular-weight polyol, and (c) a diol having at least one tertiary amino group, the high-molecular-weight polyurethane resin (A) having a SP value of 9.5 to 12.0 and a number average molecular weight of at least 15,000; and (B) 70 to 99% by weight of an epoxy-type cationic electrodepositable resin.

La présente invention porte sur une composition électrodéposable cationique pour revêtement constituée: (A) de 30 à 1 % en poids d'une résine de polyuréthane de masse moléculaire élevée préparée en faisant réagir (a) un polyisocyanate organique, (b) un polyol de masse moléculaire élevée et (c) un diol portant au moins un groupe amino tertiaire, la résine de polyuréthane de masse moléculaire élevée (A) possédant une valeur PS comprise entre 9,5 et 12,0 inclusivement et une masse moléculaire moyenne d'au moins 15 000; et (B) de 70 à 99 % en poids d'une résine électrodéposable cationique de type époxy.

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