PURPOSE: To obtain a sealing composition improved in the durability of bonding by using a specified polyoxyalkylene polymer containing reactive silicon groups.
CONSTITUTION: An oxyalkylene polymer terminated with a functional group such as hydroxyl, epoxy or isocyanate is reacted with a compound containing a functional group reactive with the above functional group and a reactive silicon group to obtain a polyoxyalkylene polymer containing reactive silicon groups of the formula [wherein R1 and R2 are each 1-20C alkyl, 6-20C aryl, 7-20C aralkyl or triorganosiloxy of (R3)3-SiO; R3 is a 1-20C monovalent hydrocarbon group; X is a hydroxyl group or a hydrolyzable group; (a) is 0-3; (b) is 0-2; (m) is 0-19; and a+Σb≥1]. This polymer is mixed with a tin (IV) compound to obtain the objective composition which can give a cured product with a thermal compression recovery of 10% or below.
FUJITA MASAYUKI
HASEGAWA TAKASHI
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