C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 83/05 (2006.01) C08L 83/07 (2006.01) C09D 183/04 (2006.01) C09D 183/05 (2006.01) C09D 183/07 (2006.01)
Patent
CA 2130719
An organopolysiloxane mixture for the preparation of adhesive-repellent organopolysiloxane films A B S T R A C T An organopolysiloxane composition that can be crosslinked by addition, comprising a) a branched organopolysiloxane having unsaturated hydrocarbon groups, - wherein at least 90% of the organo groups are methyl groups, - the molecular weight of which is on average from 9,000 to 60,000, - wherein the ratio of the number of diorganosiloxy units (D-units) to the number of branch points is on average between 15 and 40, and - wherein at least one triorganosiloxy unit (M- unit) and at maximum half of all the M-units are free of unsaturated radicals, the remaining M- units each have only one unsaturated radical and the content of unsaturated radicals is from 0.2 to 1 mmol/g and b) a linear methylhydrogenpolysiloxane, - wherein the number of siloxy units per mole is greater than the ratio of the number of D-units to the number of branch points of component a), - wherein at least half of the difunctional siloxy units (D-units) have hydrogen atoms directly bonded to silicon, and - wherein the components a) and b) are present in a relative proportion such that the ratio of the number of SiH groups of component b) to the number of unsaturated hydrocarbon atoms of component a) is between 1.5 and 3.5, and c) a catalyzing quantity of a platinum catalyst, thereby a single composition can be used to coat a variety of substances without need for changing the reservoir containing the coating composition.
de Montigny Armand
Herrmann Udo
Steinbach Hans-Horst
Aktiengesellschaft Bayer
Fetherstonhaugh & Co.
Ge Bayer Silicones Gmbh & Co. Kg
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