HIGH-SOLIDS AND POWDER COATINGS FROM HYDROXY-FUNCTIONAL ACRYLIC RESINS

摘要

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.