Patent ID: 6040361
Filing Date: 2000-03-21
Classification: C08K

Abstract:
An organopolysiloxane composition comprising:(A) 100 parts by weight of an organopolysiloxane of the following general formula (I): ##STR6## wherein R.sup.1 and X are independently selected from the group consisting of alkyl, aryl, aralkyl, and alkenyl radicals having 1 to 10 carbon atoms, substituted ones or these radicals wherein some of the hydrogen atoms attached to carbon atoms are replaced by halogen atoms, and hydroxyl radicals, k is an integer of at least 4, alkenyl or hydroxyl or both radicals account for 0.001 to 1 mol % of the entire R.sup.1 and X radicals,(B) 0.1 to 50 parts by weight of an organohydrogenpolysiloxane having at least three hydrogen atoms each attached to a silicon atom in a molecule, represented by the following general formula (2): ##STR7## wherein R.sup.2 is selected from the group consisting of alkyl, aryl, and aralkyl radicals having 1 to 10 carbon atoms, and substituted monovalent ones of these radicals wherein some of the hydrogen atoms attached to carbon atoms are replaced by halogen atoms, Y is hydrogen or R.sup.2, m is an integer of at least 1, n is an integer inclusive of 0, the sum of m+n is an integer of 3 to 500,(C) 0 to 20 parts by weight of a compound having an active hydrogen radical,(D) a platinum group metal catalyst enclosed in a compound selected from the group consisting of thermoplastic organic resins; thermoplastic silicone resins, and heat-fusible compounds with a molecular weight of up to 1,000, all having a melting or softening point of 40 to 200.degree. C., in an amount to give 1 to 1,000 parts by weight of platinum group metal atom per million parts by weight of the entire composition,(E) a platinum group metal catalyst in an amount to provide platinum group metal in an amount of from 1/100,000 up to 1/10 (by weight) of the amount of platinum group metal available from component (D),(F) 0.001 to 20 parts by weight of an addition reaction retarder, and(G) 0 to 1,000 parts by weight of a filler.