Coating agent for non-stick coatings

US4366286A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Hans Friemann · Cologne, DE
• Hans-Heinrich Moretto · Cologne, DE
• Heinrich Alberts
• Armand de Montigny · Leverkusen, DE
• Hans Toepsch · Leverkusen, DE

Key dates

• Filing date: Nov 5, 1980
• Grant date: Dec 28, 1982
• Expiry date: Nov 5, 2000

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G77/70
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

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 PA0 (A) about 10 parts of a polyorganosiloxane with hydroxyl end groups and with a viscosity of 10.sup.2 to 5.10.sup.4 Pas, PA0 (B) 0.5-5 parts of at least one cross-linking agent of the formula EQU RSiX.sub.3 wherein PA1 X is a hydrolyzable group and PA1 R is an alkyl, alkenyl, aryl or aminoalkyl group with 1-12 C atoms, PA0 (C) 0.1-2 parts of an organic tin compound as the catalyst and PA0 (D) 100-500 parts by weight of an organic solvent, the improvement which comprises additionally including, and PA0 (E) 0.1-20 parts of a graft copolymer comprising PA1 (i) 25-75% of an essentially linear polyorganosiloxane with hydroxyl end groups and with a viscosity of 100 to 500,000 mPas and PA1 (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 PA1 (iii) 10-60% of one or more monomers containing at least one aliphatic double bond.