| 摘要 |
A room temperature curable organopolysiloxane composition is provided. This composition comprises (A) a diorganopolysiloxane endcapped at both ends of the molecular chain with hydroxy group represented by the following formula: <?in-line-formulae description="In-line Formulae" end="lead"?>HO-(R2SiO)n-H<?in-line-formulae description="In-line Formulae" end="tail"?> wherein R represents a monovalent hydrocarbon group, and n represents an integer of at least 10, (B) an organopolysiloxane comprising R13SiO1/2 unit, R12SiO2/2 unit, and R1SiO3/2 unit wherein R1 represents a monovalent hydrocarbon group, and SiO4/2 unit with the proviso that molar ratio of R13SiO1/2 unit to SiO4/2 unit is in the range of 0.6 to 1.2, molar ratio of R12SiO2/2 unit to SiO4/2 unit and molar ratio of R1SiO3/2 unit to SiO4/2 unit are both in the range of 0 to 1.0, and content of the silanol group is less than 1.5% by weight, (C) surface treated fumed silica, (D) a silane and/or its hydrolysate containing at least two hydrolyzable groups in the molecule, and (E) a curing catalyst.
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