High-solids and powder coatings from hydroxy-functional...

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 33/04 (2006.01) C08G 18/62 (2006.01) C09D 5/03 (2006.01) C09D 133/04 (2006.01) C09D 133/06 (2006.01) C08L 61/20 (2006.01)

Patent

CA 2258855

High-solids and powder coatings are disclosed. The high-solids coatings comprise an acrylic resin; a melamine, silane, or polyisocyanate cross-linking agent; an organic solvent; and optionally, a pigment and a cross-linking catalyst. The acrylic resin comprises recurring units of an allylic alcohol or propoxylated allylic alcohol, a vinyl aromatic monomer, and one or more acrylate monomers. Powder coatings of the invention comprise an acrylic powder resin having a Tg within the range of about 40°C to about 80°C. Coatings of the invention are economical and give exterior coatings, especially automotive coatings, with improved weatherability and an excellent balance of physical properties compared with commercial clearcoats.

L'invention concerne des revêtements à haute teneur en solides et en poudre. Les revêtements à haute teneur en solides comprennent une résine acrylique, un agent de réticulation à base de mélamine, de silane ou de polyisocyanate, un solvant organique, et éventuellement un pigment et un catalyseur de réticulation. La résine acrylique comprend des unités récurrentes d'un alcool allylique ou d'un alcool allylique propoxylé, un monomère aromatique vinylique, et un ou plusieurs monomères acryliques. Les revêtements en poudre comprennent une résine acrylique en poudre ayant une température de transition vitreuse (Tg) comprise entre environ 40 DEG C et environ 80 DEG C. Les revêtements de l'invention sont économiques et donnent des revêtements extérieurs, notamment pour automobiles, ayant une meilleure résistance aux intempéries et un meilleur équilibre, en ce qui concerne leurs propriétés physiques, que les revêtements transparents du commerce.

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