Coatings derived from polyesters crosslinked with melamine...

Details Coatings derived from polyesters crosslinked with melamine... Coatings derived from polyesters crosslinked with melamine...

C - Chemistry, Metallurgy

08

J

C08J 7/04 (2006.01) B32B 27/36 (2006.01) C08J 3/24 (2006.01) C09D 167/00 (2006.01) C08G 63/682 (2006.01) C08L 61/20 (2006.01)

Patent

CA 2477451

A coating composition is based on a polyester mixed with an alkyl-etherified melamine formaldehyde. The coating composition is partially cured in a first stage to provide a thermoformable partially cured, tack-free, non-blocking, coating layer, followed by application to generally a contoured substrate and thermoforming to conform thereto. The contoured partially cured coating layer is then heat cured to form a cured coating. A hydroxyl-terminated polyoxetane containing repeat units derived from oxetane monomers having one or two pendent -CH2-O-(CH2)n-Rf groups, wherein Rf is partially or fully fluorinated, can be esterified with polyester-forming reactants to form a fluorinated polyoxetane-modified polyester.

L'invention concerne une composition de revêtement à base d'un polyester mélangé avec une mélamine formaldéhyde étherifiée au moyen d'alkyle. La composition de revêtement est partiellement séchée au cours d'une première étape, de manière à obtenir une couche de revêtement thermoformable partiellement séchée, non collante et non bloquante, suivie d'une application sur un substrat profilé et d'une thermoformation, aux fins d'adaptation sur celui-ci. La couche de revêtement profilée et partiellement séchée est ensuite séchée à la chaleur, de manière à former un revêtement séché. Un polyoxétane à terminaison hydroxyl renfermant des unités de répétition dérivées de monomères d'oxétane possédant un ou deux groupes latéraux Rf -CH¿2?-O-(CH¿2?)¿n?-, Rf étant partiellement ou totalement fluoriné, peut être estérifié au moyen de réactifs formant un polyester, de manière à former un polyester fluoriné de polyoxétane modifié.

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