Patent ID: 6531223
Filing Date: 2003-03-11
Classification: B32B,C08K,C08L,C09D,Y10T

Abstract:
A water-based coating composition comprising:a) at least one tannin blocking latex resin; and b) microspheres having a maximum pigment loading of at least 50% said microspheres being selected from the group consisting of expanded acrylonitrile/vinylidene chloride copolymer particles, sodium potassium aluminum silicate particles, polyvinylidene chloride copolymer particles coated with calcium carbonate, ceramic particles, glass particles, and polyethylene particles; and c) a reactive pigment; and wherein said coating composition has a PVC of 25 to 65% and a NVV of 30 to 50%, and wherein a single coat of the coating composition has exterior durability as measured by QUV testing and indicated by a &Dgr;E of less than 3, and tannin blocking as measured on a redwood substrate and indicated by at least a 30% improvement in the y-reflectance.