CURABLE COMPOSITION, COATING COMPOSITION, COATING MATERIAL, ANTIFOULING COATING MATERIAL, ITS CURED PRODUCT, AND ANTIFOULING METHOD OF SUBSTRATE

摘要

PROBLEM TO BE SOLVED: To provide curable compositions which can form thick films and excel in the strength and hardness of coated films and can exhibit good long- term antifouling performance when used as the antifouling coating material. SOLUTION: The curable compositions comprise (A) an organopolysiloxane, both molecular terminals of which are condensation reactivity functional groups, and (B) a mixture of a hydrophobic silica and a hydrophilic silica. It is preferred that component (A) is represented by the formula: W3-a(R1a)Si(R2)O[Si(R2)O]n-Si(1a)W3-a, wherein W is a hydroxyl group or a hydrolyzable group; R1 and R are each a monovalent hydrocarbon groups; n is an integer of not smaller than 5; and a is 0, 1 or 2. Further, when W in the formula is a hydroxyl group and, at the same time, a is 2, it is preferred to incorporate (C) an organosilane represented by the formula: R1aSiX4-a, wherein R1 is a monovalent hydrocarbon group; X is a hydrolyzable group; and a is 0 or 1 or its partial hydrolyzate in addition to components (A) and (B) into the compositions.