Patent ID: 6294607
Filing Date: 2001-09-25
Classification: C08F,C08G,C08L,C09D

Abstract:
An ultra-high solids coating composition which comprises:(a) a polyol blend comprising a liquid acrylic polyol and a resinous polyol in a ratio within the range of 10/90 to 90/10 by weight; wherein the liquid acrylic polyol has Mn within the range of about 500 to about 10,000, hydroxyl number within the range of about 20 mg KOH/g to about 500 mg KOH/g, and a glass transition temperature (T.sub.g ) within the range of about -70.degree. C. to about 0.degree.C.; and the resinous polyol has Mn within the range of about 500 to about 10,000, hydroxyl number within the range of about 20 mg KOH/g to about 500 mg KOH/g, and T.sub.g greater than about 25.degree. C.;(b) a crosslinker selected from the group consisting of multifunctional isocyanates, melamines, and silanes;(c) an organic solvent; and(d) optionally, a crosslinking catalyst;wherein the solids % is greater than about 65% by weight; said resinous polyol comprising:(i) from about 2% to about 60% by weight of recurring units of a hydroxyl functional monomer selected from the group consisting of allyl and methallyl alcohols, alkoxylated allyl and methallyl alcohols, and hydoxyalkyl acrylates and methacrylates;(ii) from about 40% to about 98% by weight of recurring units of a monomer selected from the group consisting of vinyl aromatics, and C.sub.1 to C.sub.20 alkyl, aryl, and cyclic acrylates and methacrylates whose homopolymers have a T.sub.g greater than or equal to 25.degree. C.; and(iii) optionally, up to about 25% by weight of recurring units of a third monomer selected from the group consisting of vinyl halides, vinyl ethers, vinyl esters, acrylic and methacrylic acids, conjugated dienes, and mixtures thereof.