Use of silanes funcionalized with epoxy groups as adhesion promoter for silicon-based cationic radiation curable coatings

摘要

Adhesion of radiation-cured adhesive silicone release coatings on films or polymer-coated paper is improved by adding as adhesion additives, at least one epoxy-functional silane. Improving the adhesion of radiation-cured adhesive silicone release coatings on films or polymer-coated paper, involves adding as adhesion additives, at least one epoxy-functional silane of formula (III). R 1-R 3alkyl, alkoxy, aryl, or aryloxy radicals having 1-20C atoms, or alkenyl radicals having 2-20C carbon atoms, at least one radical being an alkoxy or aryloxy group; R 42-20C alkenyl radicals and optionally comprise ether, ester, urethane or amide groups; R 5H or 1-20C alkyl groups; R 6>H, 1-20C alkyl groups or 2-5C alkylene groups which with R 4 form a cyclic ring. An independent claim is also included for radiation-cured silicone release coatings for a substrate which comprise at least one component of formula (IV), or are polyether radicals of formula: -(CH 2)-[CH 2-CH(R 8)-O] m-H (V); and adhesion additive which comprises at least one epoxy-functional silane (III). R 72-20C alkenyl atoms, and optionally comprise ether, ester, urethane or amide groups; R 81-20C alkyl radicals, H, or 6-20C aryl radicals; n : 3-10; m, t : 1-100; r : 0-1000; s : 0.1-100. [Image] [Image].