Crosslinkable silicone composition for the realization of non-stick coatings for flexible supports and adhesion promoter additive contained in this composition

摘要

Silicone composition A comprising a silicone base B capable of crosslinking or hardening by polyaddition, characterized in that it comprises at least one crosslinking additive X and adhesion promoter comprising at least one polyorganosiloxane C constituted of the siloxyl units (I.1) a (I.3) of the following formulas: ** Formula ** in which: - a = 1 or 2, b = 0, 1 or 2 and a + b = 1, 2 or 3; - c = 1, 2 or 3 - d = 1 or 2, e = 0, 1 or 2 and d + e = 1, 2 or 3 - Y represents, independently, an epoxy-functional hydrocarbon group that eventually comprises one or several heteroatoms such as an oxygen atom, preferably having 2 to 20 carbon atoms included and, more preferably still, selected from the group consisting of an alkyl glycidyl ether, a linear, branched and / or cyclic epoxyalkyl, a linear, branched epoxyalkenyl and / or cyclic, and a glycidyl ester of carboxylic acid; - Z1, Z2 and Z3 represent, independently of each other, a monovalent, hydrocarbon group, having 1 to 30 carbon atoms and possibly substituted with one or more heteroatoms and preferably selected from the group consisting of the alkyl groups that they have 1 to 8 carbon atoms included and the aryl groups, and even more preferably, selected from the group consisting of a methyl, ethyl, propyl, 3,3,3-trifluoropropyl, xyl, tolyl and phenyl radical, - said polyorganosiloxane C comprises, per molecule, at least one siloxyl unit (I.1) carrying epoxy functional hydrocarbon groups and at least three siloxyl units (I.3) carrying hydrogeno siloxy groups, and - the content of siloxy units (I.1) is between 10 and 80 mmol for 100 g of polyorganosiloxane C, and even more preferably between 20 and 60 mmol for 100g of polyorganosiloxane C.