Curable adhesive organosilicon compositions

摘要

A curable organosilicon composition comprising an alkenyl functional organopolysiloxane having at least two silicon-bonded groups with aliphatic unsaturation, a precious metal based hydrosilation catalyst and a hydrosiloxane crosslinker having at least three silicon-bonded hydrogen atoms per molecule, which has at least one trivalent siloxane unit per molecule, at most 40% of all monovalent siloxane units, at least 40% of divalent siloxane units, at least 50% of all siloxane units of the crosslinker with a silicon-bonded hydrogen, and of the total number of siloxane units present in the total amount of hydrosiloxane crosslinkers in the composition at least 0.75% trivalent siloxane units. These compositions provide improved anchorage to a range of substrates.