| 摘要 |
Polyorganosiloxane with at least three silicon-bonded hydrogen atoms is used as a crosslinking agent in a silicone composition that has a viscosity of no more than 1500 mPas at 25 deg C and is crosslinkable by polyaddition in the presence of no more than 80 ppm of a metal catalyst to form a water-repellent release coating. Independent claims are also included for: (1) a silicone composition capable of crosslinking by polyaddition to form a water-repellent release coating, comprising a polyorganosiloxane with at least two silicon-bonded alkenyl groups, a linear polyorganosiloxane of formula (I) with at least three silicon-bonded hydrogen atoms, and no more than 80 ppm of a platinum-group metal catalyst, where the composition has a viscosity of no more than 1500 mPas at 25 deg C; (2) a substrate with a release coating as above. M alpha M' beta D psi D' delta (I) M = (R<1>)3SiO1/2; M' = Ha(R<1>)bSiO1/2; a = 1-3; b = 0-3; a+b = 3; D = (R<2>)2SiO2/2; D' = HR<3>SiO2/2; alpha , beta = 0-2 provided that beta is not 0; psi , delta = numbers greater than 0; psi / delta = 0-0.4 but no 0; beta / delta = 0.02-0.06. |
