Crosslinkable silicon composition for producing non-stick coatings for polymer films

Abstract

This invention concerns cross-linkable silicon compositions that can be used, in particular, to form coatings or water repellent and non-stick film preferably for flexible supports such as synthetic or natural polymer films, for example PET. These compositions are of the types which include crosslinking polyorganosiloxanes bearing Si-H units and unsaturated polyorganosiloxanes preferably containing vinyl, capable of reacting with the crosslinking agent by addition reaction in the presence of platinum to form a release crosslinked non-stick coat on the flexible support. The aim is to propose new liquid coating silicon compositions with no solvents, crosslinkable and non-stick and / or water repellent coating for flexible supports, quasi instantaneous and producing crosslinkable silicon coating of very high quality, in particular with regard to hook / tackiness on a ' high rub-off ' support and anti-stick feature (sufficient high-speed breakaway force). To reach this goal, the invention proposes silicon compositions with the silicon compound ingredient A alcenylated PolyOrganoSiloxane (POS) containing an F1 fraction and an F2 fraction that are different from each other; F2, the adherence enhancer comprising a linear monoalcenylated silicon oil (A2.1) at one of its ends and / or a long linear alpha, omega-alcenylated silicon oil (A2.2) and / or a 'weakly alcenylated linear oil. Applications: non-stick silicon coatings obtained from crosslinking / polyaddition for PET.

Description

technical field [0001] The technical field of the invention is crosslinkable or crosslinked silicone compositions, in particular coatings or waterproof non-adhesive films which can be used to form flexible supports, preferably natural or synthetic polymeric in the form of thin films. [0002] Such curable non-adhesive silicone compositions are applied to such supports for easy removal of adhesive material reversibly laminated to the support. [0003] More specifically, the silicone composition of the present invention contains: [0004] - Functionalized polyorganosiloxanes (POS) with Si-H on the same molecule or on different molecules [(M) a’≥0 (M H ) b’≥0 (D H ) c’≥0 (D) d’≥0 ] and Si-alkenyl units, preferably Si-vinyl (Vi) [(M) a”≥0 (M Vi ) b”≥0 (D Vi ) c”≥0 (D) d”≥0 ] unit; the Si-H unit can react with Si-alkenyl units; [0005] - a suitable metal catalyst, preferably platinum; [0006] - optionally, at least one adhesion regulating system, such as based on s...

AI Technical Summary

Problems solved by technology

[0031] Current technical solutions do not solve the above problems, especially with regard to flexible polymer supports (especially made of polyesters such as PET)