| 摘要 |
PROBLEM TO BE SOLVED: To obtain an aqueous coating composition which contains organic volatile components in a small amount, is safe for humans and living organisms, and does not cause water pollution, etc., by using an organism-derived polymer crosslinked by a biodegradable crosslinking method. SOLUTION: Polysaccharides, protein, and nucleic acid are preferable as the organism-derived polymer. Crosslinking methods capable of utilizing reactions for forming crosslinks with functional groups of an organism-derived polymer, such as methods using Schiff base formation, ester bond formation, Michael addition reaction, etc., are listed as the crosslinking methods. Moreover, an organism-derived polymer having electric charge is used; the organism-derived polymer may be positively or negatively charged. The organism-derived polymer is preferably water-soluble, still preferably has a water solubility of 1 g/100 ml or higher, and is compounded preferably in an amount of 5 wt.% or higher based on the solid content of the composition.
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