Multilayer coating film formation process

Details Multilayer coating film formation process Multilayer coating film formation process

B - Operations, Transporting

05

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B05D 1/38 (2006.01) B05D 3/02 (2006.01) B05D 3/06 (2006.01) B05D 7/00 (2006.01) B05D 7/14 (2006.01) C25D 13/06 (2006.01)

Patent

CA 2252096

A process to form a multilayer coating film, which is excellent in smoothness and capable of preventing a generation of popping even in case of a thick coating, characterized by that after a cationic electrodeposition coating is coated and cured by heating, an intermediate coating, comprising polymerizable unsaturated compound, photopolymerization initiator, thermal polymerization initiator, and further optionally pigment and/or polyester resin and crosslinking agent, is coated, and said coating film is cured by irradiation with an actinic ray, and then a thermocurable top coating is coated and cured by heating, is disclosed.

Divulgation d'un procédé pour former un film protecteur multicouche, possédant un excellent lissé et capable de prévenir l'apparition de boursouflures, même dans le cas de revêtement épais. Ce procédé est caractérisé par le fait qu'après avoir déposé un revêtement par électrodéposition cationique et durci celui-ci à la chaleur, on dépose un revêtement intermédiaire, renfermant un composé insaturé polymérisable, un amorceur de photopolymérisation, un amorceur de polymérisation thermique et, facultativement, un autre pigment et/ou une résine polyester et un agent de réticulation. Ce dernier est durci par irradiation avec un rayonnement actinique. On enduit ensuite ce dernier d'une couche de finition thermodurcissable, que l'on fait durcir.

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