| 摘要 |
PROBLEM TO BE SOLVED: To obtain a primer composition applicable even in the case of a polyisobutylene-based sealing material especially useful for a construction, widely useful for various members to be applied such as a window glass a coated surface a placing joint face of old sealing material a porous face, etc. SOLUTION: This primer composition comprises (A) an organopolysiloxane resin containing a hydroxyl group or an alkoxy group bonded to a silicon atom, (B) an amino group-containing silane compound, (C) a hydrolyzable silyl group- containing urethane prepolymer, (D) a tin (IV) compound and/or an organic titanic acid ester as a catalyst and (E) an organic solvent.
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