AQUEOUS COATING COMPOSITION

摘要

An aqueous coating composition containing fine polymer particles (A) and an inorganic filler (B) dispersed in an aqueous medium, wherein the polymer particles (A) comprise: (A-1) 50-100 wt. % of emulsion polymer particles of a synthetic rubber containing 30-90 wt. % of conjugated diolefin units and having a glass transition point of 0 DEG C or below; (A-2) 0-50 wt. % of emulsion polymer particles containing 30-99.9 wt. % of repeating units represented by general formula (I), (wherein R<1> represents hydrogen or methyl; Q represents -COOR<2>, C6-C12 aryl or CN; and R<2> represents lower alkyl) and having a glass transition point of at the lowest of 200 DEG C; and (A-3) 0-100 parts by weight of urethane resin emulsion particles per 100 parts by weight in total of the polymer particles (A-1) and (A-2), and the composition further contains: (C) an isocyanate derivative as a cross-linking agent. This composition is used as mastic coating material, soundproof coating material, vibrationproof coating material, caulking material, and the like. In particular, it is used to protect worked outdoor sheet metal members of vehicles, especially, automotive underfloor panel, tire house, chassis, gasoline tank, suspension, and so on from chipping or scratches caused by spattered stones, because it is excellent in various performances including chipping resistance, tight bonding to worked metallic member, uniformness and smoothness of coating, water resistance, gasoline resistance, impact resistance and soundproofness, and low-temperature characteristics such as chipping resistance at a temperature as extremely low as -30 DEG C or below.