Curable coating compositions having improved compatibility...

C - Chemistry – Metallurgy – 09 – D

Patent

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C09D 201/02 (2006.01) C08G 2/06 (2006.01) C08L 61/32 (2006.01) C09D 133/14 (2006.01) C09D 161/20 (2006.01) C09D 161/34 (2006.01) C09D 175/04 (2006.01)

Patent

CA 2439965

The invention provides coating compositions having improved scratch and mar resistance. The curable coating compositions of the invention comprise a film- forming component (A) comprising one or more active hydrogen containing components (a), and one or more curing agents (b) comprising at least one aminoplast resin (bi) having from 0.5 to 3.5 moles of NH per mole of aminoplast resin (bi), a blocked acid catalyst (B) having a blocking agent which is not a tertiary amine, and a tertiary amine (C) present in an amount equal to 10 to 150% by weight of the blocking agent. The invention further provides a method of making cured coated substrates having improved scratch and mar resistance as well as a method of making multilayer coating compositions.

L'invention concerne des compositions de revêtement possédant une résistance aux griffures et marquages améliorée. Les compositions de revêtement séchables selon l'invention comprennent un composant de formation de film (A) renfermant un ou plusieurs composants comprenant un hydrogène actif (a), et un ou plusieurs agents de séchage (b) renfermant au moins une résine aminique (bi) comprenant entre 0,5 et 3,5 moles de NH par mole de résine aminique (bi), un catalyseur d'acide bloqué (B) comprenant un agent de blocage n'étant pas une amine tertiaire, ainsi qu'une amine tertiaire (C) présente en une quantité égale à entre 10 et 150 % en poids de l'agent de blocage. L'invention concerne également un procédé de fabrication de substrats revêtus séchés possédant une résistance aux griffures et marquages améliorée, ainsi qu'un procédé de préparation de compositions de revêtement à couches multiples.

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