Method of improving the appearance of coated articles having...

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 133/14 (2006.01) C09D 5/04 (2006.01) C09D 7/12 (2006.01) C09D 131/02 (2006.01) C09D 175/04 (2006.01) B05D 1/04 (2006.01) B05D 3/02 (2006.01)

Patent

CA 2432890

The invention provides a method of obtaining improvements in the appearance of articles having both vertically and horizontally orientated surfaces. The invention requires applying a coating composition comprising a rheology control agent (b) having substantially colorless, substantially inorganic microparticles (i) and a compound (ii) comprising the reaction product of an amine and an isocyanate to an article having at least one horizontally orientated surface and at least one vertically orientated surface so as to provide a coated horizontally orientated surface and a coated vertically orientated surface. The coated vertically orientated surface has improved sag resistance, most preferably a sag resistance of at least 1.2 mils. The coated surfaces are then cured to provide a cured horizontally orientated film having an improved surface appearance, most preferably a surface appearance having a DOI of at least 70.

Cette invention concerne un procédé qui peut améliorer l'aspect d'articles présentant des surfaces orientées verticalement et horizontalement, et une composition de revêtement utilisable avec ce procédé. La composition de revêtement contient un élément filmogène (a) et un agent rhéologique (b) contenant des microparticules (i) sensiblement inorganiques, sensiblement incolores et un composé (ii) comprenant le produit de réaction d'un amine et d'un isocyanate. Un procédé de l'invention particulièrement préféré consiste à appliquer la composition de revêtement sur un article présentant au moins une surface orientée horizontalement et au moins une surface orientée verticalement, de façon à obtenir une surface revêtue orientée horizontalement et une surface revêtue orientée verticalement. La surface revêtue orientée verticalement présente une résistance à l'affaissement améliorée, de préférence, une résistance à l'affaissement d'au moins 1,2 mils. Les surfaces revêtues sont ensuite polymérisées pour donner une couche polymérisée orientée horizontalement présentant un aspect superficiel amélioré, de préférence un aspect superficiel ayant une netteté d'image (DOI) d'au moins 70.

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