COATING COMPOSITIONS AND PROCESS FOR PREPARING ADHESIVE-REPELLENT COATINGS

摘要

In a sheet coated on both surfaces with non-stick coatings, one of the coatings being more non-stick than the other, the improvement which comprises employing as the lesser non-stick coating a composition according to claim 1 by weight consisting essentially of (A) about 10 parts of a polyorganosiloxane with hydroxyl end groups and with a viscosity of 102 to 5.104 Pas, (B) 0.5-5 parts of at least one cross-linking agent of the formula RSiX3 wherein X is a hydrolyzable group and R is an alkyl, alkenyl, aryl or aminoalkyl group with 1-12 C atoms, (C) 0.1-2 parts of an organic tin compound as the catalyst and (D) 100-500 parts by weight of an organic solvent, the improvement which comprises additionally including, and (E) 0.1-20 parts of a graft copolymer comprising (i) 25-75% of an essentially linear polyorganosiloxane with hydroxyl end groups and with a viscosity of 100 to 500,000 mPas and (ii) 10-70% of at least one organic polymer with a molecular weight of 500 to 100,000, linked to (i) via bridges formed on polymerization of (iii) 10-60% of one or more monomers containing at least one aliphatic double bond.