ANTIFOULING PAINT COMPOSITION HAVING HIGH STORAGE STABILITY

PURPOSE:To provide the titled composition having excellent antifouling property, and high storage stability, free from the lowering of the dischargeability from the paint can for compounding and the deviation of the coating film thickness from the designed thickness caused by the thickening of the paint, and suitable for the antifouling coating of a ship's bottom, etc., by adding an ester compound having a specific functional group to a triorganotin-containing polymer and copper, etc. CONSTITUTION:The objective composition is prepared e.g. by adding (A) a compound of formula (R and R are H or 1-5C alkyl; R is hydroxyl or acetyl; R is 1-5C alkyl) (e.g. methyl acetoacetate) to (B) a triorganotin-containing polymer or copolymer obtained by the copolymerization of (i) a polymerizable unsaturated monobasic acid (e.g. acrylic acid) with (ii) a polymerizable unsaturated monomer (e.g. methyl methacrylate) and (B) copper or a copper compound (e.g. cuprous oxide). The amount of the triorganotin- containing polymer, etc. is 5-50wt% based on the solid component of the whole paint composition, and that of the component (A) is 0.1-100pts.wt. per 100pts.wt. of the solid component of the component (B). EFFECT:There is no deterioration of the coating properties such as ununiformity of film thickness, etc.