C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
C09D 133/14 (2006.01) C08G 18/38 (2006.01) C09D 161/32 (2006.01) C09D 175/04 (2006.01) C08L 61/32 (2006.01) C08L 75/04 (2006.01)
Patent
CA 2463734
The invention provides a clearcoat coating composition containing either one acrylic polymer with secondary hydroxyl functionality and carbamate functionality or two acrylic polymers, the first having secondary hydroxyl functionality and the second having carbamate functionality; a carbamate- functional or urea-functional material that is the reaction product of (1) a compound comprising a primary carbamate or primary urea group and an hydroxyl group and (2) a compound that is reactive with hydroxyl groups on a plurality of molecules of compound (1), but that is not reactive with the carbamate or urea groups on compound (1); and a crosslinking component including an aminoplast crosslinker. A windshield sealant can be applied directly to the clearcoat layer produced from the composition without the need for a special primer layer.
L'invention porte sur un revêtement de type "clearcoat" comprenant soit un polymère acrylique à double fonction: hydroxyle secondaire + carbamate, soit deux polymères acryliques: l'un à fonction hydroxyle secondaire, et l'autre à fonction carbamate; un matériau à fonction carbamate ou à fonction urée produit de réaction de: (1) un composé comprenant un carbamate primaire ou un groupe urée primaire ou un groupe hydroxyle, et (2) un composé réagissant avec les groupes hydroxyles de molécules du composé (1) mais pas avec ses groupes carbamate ou urée; et un agent de réticulation comportant un réticulant d'aminoplaste. On peut appliquer directement un mastic pour pare-brise sur la couche de clearcoat sans avoir à utiliser de couche d'apprêt.
Gilbert John
Mehta Sanjay
Santure David
Basf Corporation
Robic
LandOfFree
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