Silicon reactive oligomers and coating compositions made...

C - Chemistry – Metallurgy – 08 – G

Patent

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C08G 18/28 (2006.01) C08G 18/32 (2006.01) C08G 18/38 (2006.01) C08G 18/40 (2006.01) C08G 18/42 (2006.01) C08G 18/46 (2006.01) C08G 18/50 (2006.01) C08G 18/62 (2006.01) C08G 18/71 (2006.01) C08G 18/79 (2006.01) C09D 175/04 (2006.01)

Patent

CA 2319547

The present invention is directed to low VOC curable coating compositions suitable for use in various mar and etch resistant coatings, such as in automotive coatings. The binder of the composition includes silicon/hydroxyl and cross-linking components. The silicon/hydroxyl component includes one or more reactive oligomers having a linear or branched cycloaliphatic moiety and at least two functional groups with at least one being a silane or a silicate group, the remaining being a hydroxyl group. Applicants have unexpectedly discovered that by including silane or silicate functionalities in these reactive oligomers, the solids level of the composition can be significantly increased at reduced composition viscosities. As a result, such high solids low VOC compositions can be readily applied by conventional application means, such as by spraying.

La présente invention concerne des compositions de revêtement durcissables à faible teneur en composés organiques volatils, destinées à être utilisées dans diverses couches de laque très brillantes résistantes à l'attaque, telles que les revêtements de l'industrie automobile. Le liant de la composition comprend un composant silicium/hydroxyle et un composant de réticulation. Le composant silicium/hydroxyle renferme un ou plusieurs oligomères réactifs ayant une fraction cycloaliphatique linéaire ou ramifiée et au moins deux groupes fonctionnels, l'un d'entre eux au moins étant un groupe silane ou silicate, le reste étant un groupe hydroxyle. On a découvert avec surprise que l'adjonction de fonctionnalités silane ou silicate dans ces oligomères réactifs permet d'accroître de façon notable la teneur en matières solides de la composition, pour des viscosités réduites de la composition. Par conséquent, ces compositions à faible teneur en composés organiques volatils et à haute teneur en matière solides peuvent être appliquées rapidement par des moyens d'application classiques, tels que la pulvérisation.

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