Provided is a room-temperature curable organopolysiloxane composition including
(I) an organopolysiloxane, and (II) a silane compound containing silicon-bonded
hydrolysable groups and/or a partial hydrolysis-condensation product thereof. The
organopolysiloxane (I) is a condensation product of (A) an organosiloxane which
includes R3SiO1/2 units wherein R represents an unsubstituted
or substituted monovalent hydrocarbon group and SiO4/2 units, in which
the molar ratio R3SiO1/2 to SiO4/2 is 0.6 to 1.2,
and further includes less than 2.0% by weight of silicon-bonded hydroxyl groups,
and (B) a diorganopolysiloxane with molecular chain terminals blocked with functional
group-containing silyl groups. This composition generates a cured product or coating
film with good transparency and good strength, which is useful as a coating material
for electrical or electronic components or circuits, a sealant for liquid crystal
display elements, and an antifouling paint for underwater structures.
