Curable coating composition and coating film forming method

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 133/10 (2006.01) C08F 8/00 (2006.01) C08F 299/00 (2006.01) C09D 5/20 (2006.01) C09D 163/02 (2006.01)

Patent

CA 2378995

The present invention is to provide a curable coating composition having much less of a volatile organic component, and being excellent in coating film performance such as durability and scratch resistance, and a coating film forming method using the above curable coating composition capable of suppressing generation of sagging and so on. The present invention is a curable coating composition which comprises (a) a component having an active methylene group and/or an active methine group, (b) a component having a methacrylate group and/or an acrylate group, (c) a Michael reaction catalyst and (d) a photo-polymerization initiator. The present invention also provides a coating film forming method which comprises a step (1) of applying a curable coating on a substrate to be coated and a step (2) including a stage of irradiating with ultraviolet ray and a stage of heating, said curable coating comprising the above curable coating composition.

Composé de revêtement durcissable comprenant une quantité très réduite d'un composé organique volatil et dont l'efficacité comme pellicule protectrice, notamment en ce qui a trait à sa durabilité et à sa résistance aux rayures, est excellente, ainsi que procédé de formation, à l'aide de ce composé de revêtement durcissable, d'une pellicule protectrice pouvant prévenir l'affaissement et d'autres effets de ce type. Le composé de revêtement durcissable comprend les éléments suivants : a) un composant comprenant un groupe méthylène actif ou un groupe méthine actif; b) un composant comprenant un groupe méthacrylate ou un groupe acrylate; c) un catalyseur de l'addition de Michael; d) un initiateur de photopolymérisation. Le procédé de formation de la pellicule protectrice comprend une première étape (1) d'application d'un revêtement durcissable sur un substrat à recouvrir et une seconde étape (2) qui comprend une opération d'exposition à des rayons ultraviolets suivie d'une opération de chauffage, le revêtement durcissable comprenant le composé de revêtement durcissable susmentionnée.

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