Liquid silicone formulation for producing release and water-repellent crosslinked elastomer coatings on a solid support, such as a paper support

摘要

The invention relates to a liquid silicone formulation for the preparation of water-repellent and release crosslinked elastomer coatings on a solid support, for example made of paper. The targeted aim is to overcome the problem of the lack of adhesion of silicone elastomer films with a release outer face intended to be adhesively bonded to flexible supports of the following types: dense paper of glassine type or polypropylene polymer film. To achieve this aim, the liquid silicone formulation according to the invention which can be used as coating base for the preparation at very high speed of a water-repellent and release crosslinked elastomer coating on a solid support comprises: at least one crosslinkable polyorganosiloxane POS (I) (POS of SiVi type and POS of SiH type); at least one catalyst (II) (platinum-based); optionally an adhesion-adjusting system (III); an adhesion promoter (IV) comprising an epoxidized alkoxysilane and/or an alkenylated alkoxysilane, and a metal chelate and/or a metal alkoxide (GLYMO/MEMO/TiOBu4). The most viscous POS (I) has a viscosity of less than or equal to 1500 mPa.s.