| 摘要 |
PROBLEM TO BE SOLVED: To obtain a room temperature-curable polyorganosiloxane composition exhibiting excellent properties after cured and having a reduced tack-free time. SOLUTION: This room temperature-curable polyorganosiloxane composition comprises (A) a polyorganosiloxane having at both ends a trialkoxy group and obtained by condensing a silanol group-terminated polyorganosiloxane with a tetraalkoxysilane in an excess molar amount based on the amount of the silanol group in the polyorganosiloxane, (B) a silica powder having a specific surface area of at least 50 m<SP>2</SP>/g, (C) a specific organosilane or a partial hydrolyzate thereof, and (D) a titanium chelate catalyst. The method for manufacturing the room temperature-curable polyorganosiloxane composition comprises controlling the amount of the tetraalkoxysilane to at most 0.5 wt% of the component (A) by pressure reduction and/or heating when mixing the component (A) with the component (B), and subsequently adding the components (C) and (D). COPYRIGHT: (C)2004,JPO&NCIPI
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