| 摘要 |
PROBLEM TO BE SOLVED: To provide an aqueous resin composition having excellent freezing-melting stability, storage stability and low-temperature film-forming properties though the composition has a low minimum film-forming temperature (MFT) and forming a coated film having excellent warm water whitening, blocking, weather and rain streak stain resistances, gloss and smoothness, etc. SOLUTION: The aqueous resin composition contains an emulsion containing specific heterophasic structural particles obtained by a multistage emulsion polymerization method and a specified resin. The outermost phase of the heterophasic structural particles is formed of an emulsion copolymer containing an ethylenically unsaturated monomer unit having a carboxy group and an ethylenically unsaturated monomer unit having at least one of a polyethylene glycol chain and a polypropylene glycol chain and has -50 to 15°C Tg. The emulsion copolymer of an ethylenically unsaturated monomer forming at least one phase of inner phases of the heterophasic structural particle has 30-150°C Tg. The difference between the Tg of the emulsion copolymer forming the outermost phase and the Tg of the emulsion copolymer forming at least the one phase of the inner phases is 30-135°C. COPYRIGHT: (C)2004,JPO
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