| 摘要 |
<p>PURPOSE:The titled composition having improved storage stability, curable in a low-temperature range in a short time, having no change in releasability with time, obtained by blending an organopolysiloxane with an unsaturated hydrocarbon compound having a terminal ethynyl group and a double bond conjugated with it. CONSTITUTION:(A) 100pts.wt. organopolysiloxane having >=100cp viscosity at 25 deg.C, at least two vinyl groups bonded to Si, and a linear structure is blended with (B) 0.3-40pts.wt. organohydrogen polysiloxane containing at least two SiH groups (at least five total of number of the vinyl groups in the component and number of SiH groups) per molecule, (C) 0.01-7pts.wt. compound such as 3- methyl-3-pentene-1-yl, etc. shown by the formula (R<1>-R<3> are H or hydrocarbon group, and total C number is 2-6), and (D) and a catalytic amount of platinum catalyst (1-1,000ppm calculated as platinum amount based on the component A). Preferably the three components A-C are uniformly preblended, and the component D is added to the blend.</p> |
