Curable coating compositions having improved compatibility...

C - Chemistry – Metallurgy – 09 – D

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Details

C09D 201/02 (2006.01) B05D 1/36 (2006.01) B05D 7/00 (2006.01) C08J 3/24 (2006.01) C09D 161/20 (2006.01) C09D 161/32 (2006.01) C09D 179/02 (2006.01) C09D 201/00 (2006.01)

Patent

CA 2439966

The invention provides curable coating compositions which have improved compatibility with other coating compositions and which provide improved scratch and mar resistance. The compositions comprise a film-forming component (A), a catalyst (B) for the film-forming reaction comprising one or more strong acids having a pKa of 2.5 or less, and a volatile catalyst carrier (C) comprising one or more tertiary amines having a boiling point of 100 degrees C. The film-forming component (A) comprises one or more crosslinking agents (b) at least one of which is an aminoplast curing agent (bi) having from 0.5 to 3.5 moles of NH per mole of aminoplast curing agent (bi). The invention also provides a method of making thermally cured films having improved scratch and mar as well as a method of making multilayer-cured films.

La présente invention concerne des compositions d'enrobage durcissables présentant une meilleure compatibilité avec d'autres compositions d'enrobage et une meilleure résistance aux éraflures et aux marques. Les compositions comprennent un composant filmogène (A); un catalyseur (B) destiné à la réaction filmogène comprenant un ou plusieurs acides forts ayant un pKa égal ou inférieur à 2,5; et un support catalytique volatil (C) contenant une ou plusieurs amines tertiaires ayant un point d'ébullition de 100 degrés C. Le composant filmogène (A) comprend un ou plusieurs agents de réticulation (b), au moins l'un de ces agents de réticulation étant un durcisseur aminoplaste (bi) comprenant de 0,5 à 3,5 moles de NH par mole de durcisseur aminoplaste (bi). Cette invention concerne également un procédé permettant de fabriquer des pellicules thermiquement durcies présentant une meilleure résistance aux éraflures et aux marques, ainsi qu'un procédé permettant de fabriquer des pellicules à couches multiples durcies.

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