| 摘要 |
PURPOSE:To prepare the title compsn. having an excellent flowability and giving a cured article excellent in strengths by compounding a specific organopolysiloxane, a specific organohydrogenpolysiloxane, a specific hydrophobic silica, a specified amt. of an organocyclopolysiloxane, and a specified amt. of a platinum compd. CONSTITUTION:The title compsn. comprises 100 pts.wt. organopolysiloxane having a viscosity at 25 deg.C of 100-200000cSt and at least two alkenyl groups in the molecule; an organohydrogenpolysiloxane having a viscosity at 25 deg.C of 1-1000cSt and at least three hydrogen atoms directly bonded to the Si atom (identicalSiH bond) and in an amt. capable of supplying the identicalSiH groups in a molar amt. of 1-50 times as much as the alkenyl group in the organopolysiloxane; 1-80 pts.wt. silanol group-contg. organocyclopolysiloxane of the formula [wherein R<1> is a 1-8C (substd.) hydrocarbon group; 1<=n<=8; 0<=m<=8; and 3<=n+m<=8]; a catalytic amt. of a platinum compd.; and 5-50 pts.wt. hydrophobic silica which is surface-treated with an organosilicon compd. and has 2wt.% or higher carbon adsorbed on the surface. |
