| 摘要 |
An organopolysiloxane composition that can be crosslinked by addition, comprising a) a branched organopolysiloxane having unsaturated hydrocarbon groups, and triorganosiloxy end units wherein at least 90% of the organo groups are methyl groups, the number average 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 hydrogenpolysilxoane, wherein the number of siloxy units per molecule 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.
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