USE OF HYDROPHILIC (CO) POLYMERS AS ADDITIVES IN AQUEOUS SILICONE EMULSIONS, CROSSLINKABLE IN WATERPROOF AND ANTI-ADHERENT COATINGS FOR SOFT SUPPORTS

摘要

The invention concerns an aqueous silicone emulsion for use in particular in preparing a release coating on fibrous supports or for instance made of paper. Said emulsion comprises polyorganosiloxanes (POS) with Sy-vinyl units and POS with SiH units, crosslinkable by polyaddition in the presence of a platinum catalyst. The inventive emulsion consists in the use of at least a hydrophilic stabilising (co)polymer with molar mass Mw=105 g/mol, preferably Mw=5.105 g/mol for improving coalescence stability under shearing of aqueous silicone emulsions, capable of crosslinking to form release coatings on paper supports, and/or for improving regularity and homogeneity of the deposit of crosslinkable aqueous silicone emulsions, on both surfaces of a paper support, and/or for reducing the deposits of crosslinkable aqueous silicone emulsions to form release coatings on paper supports and/or for limiting, even eliminating, the tendency to foam which crosslinkable aqueous silicone emulsions exhibit to form release coatings on flexible supports.