Patent ID: 6020412
Filing Date: 2000-02-01
Classification: C08L,C09D,C09J

Abstract:
A controlled release coating composition adapted for application to a release backing substrate, said composition comprising an aqueous formulation containing a blend of(1) a water-soluble, water-dispersible or water-emulsifiable adhesion promoter, and(2) a water-soluble, water-dispersible or water-emulsifiable crosslinkable silicone release agent which is compatible with said adhesion to form a release surface which exhibits a release force to an adhesives of about 50 grams per inch to about 1000 grams per inch when tested with a one inch wide TESA 7475 acrylic adhesive test tape pulled at a pull rate of about 12 inches per minute after aging about one day, said release force being substantially linearly related to a solids weight ratio of adhesion promoter to silicone release agent over a solids weight ratio range of from about 0.2:1 to about 20:1,wherein said adhesion promoter comprises at least one member selected from the group of adhesion promoters consisting of(1) adhesion promoters comprising at least one ester formed from a phtalic acid radical of the formula C.sub.6 H.sub.4 (COO).sub.2 .dbd., and an alkylene or polyalkene diol or polyol,(2) adhesion promoters comprising from about 30% by weight to about 50% by weight methyl methacrylate from about 30% by weight to about 50% by weight ethyl acrylate, from about 1% by weight to about 10% by weight methacrylamide, and from about 5% by weight to about 25% by weight of a reactive esterified triazine,(3) adhesion promoters comprising from about 40% by weight to about 80% by weight methyl methacrylate, from about 20% by weight to about 50% by weight ethyl acrylate, and from about 1% by weight to about 10% by weight N-methylolacrylamide, and(4) adhesion promoters comprising condensed polymers of an aminoalkylalkoxysilane.