Coating system
AssigneeBASF SE
InventorsLyle A. Caillouette, Michael L. Praw, Jeffrey R. Janos, Stacy E. Haynes
Life of this patent
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Abstract
A coating, system comprises 30 to 90 parts by weight of a bioresin component and 10 to 70 parts by weight of an isocyanate component, based on 100 parts by weight of the coating system, and has a percent solids of greater than 60%. The bioresin component comprises an acrylic polymer and a biopolyol formed from a natural oil. A method of forming a coating on a substrate with the coating system comprises the steps of combining the bioresin component and the isocyanate component to form a reaction mixture having a percent solids of greater than 60 percent, applying the reaction mixture onto the substrate, and curing the reaction mixture to form the coating on the substrate.
Claims12
A coating system comprising:
- (A) 50 to 60 parts by weight of a bioresin component, based on 100 parts by weight of the coating system, said bioresin component comprising;
- (i) 20 to 30 parts by weight of an acrylic polymer based on 100 parts by weight of the bioresin component, said acrylic polymer having a hydroxyl number of from 135 to 150 mg KOH/g and a viscosity of from 3,600 to 8,000 mPa·s at 25° C., and
- (ii) 55 to 65 parts by weight of a biopolyol formed from coconut oil based on 100 parts by weight of the bioresin component, said biopolyol having a hydroxyl number of from 300 to 330 mg KOH/g and a viscosity of from 700 to 1,400 mPa·s at 25° C.;
- and
- (B) 40 to 50 parts by weight of an isocyanate component that is isocyanurated hexamethylene diisocyanate (HDI) having an NCO content of from 22 to 23 weight percent and a viscosity at 23° C. of from 2,500 to 4,500 mPa·s, based on 100 parts by weight of the coating system, said isocyanate component reactive with said bioresin component;
- wherein said coating system has a percent solids of greater than 90 percent, and
- said acrylic polymer comprises from 5 to 50 percent by weight 2-ethylhexyl acrylate units, from 5 to 50 percent by weight hydroxyethyl methacrylate units, and from 5 to 50 percent by weight styrene units.
Dependencies are inferred from the claim text.