COPOLYURETHANE RESIN HAVING POLYLACTIC ACID SEGMENT, AND AQUEOUS EMULSION AND COATING FLUID COMPOSITION, CONTAINING SAME

摘要

The present invention provides a poly (lactic acid) resin having a self-emulsification function where a stable aqueous dispersion can be formed even if no emulsifier is added and also to provide an aqueous dispersion and a coating solution composition containing the same. A copolymerized polyurethane resin having a poly(lactic acid) segment and a segment containing sulfonic acid salt group in a molecule, an aqueous emulsion wherein this resin is dispersed in a liquid, and a coating solution composition which contains this aqueous emulsion. The segment containing sulfonic acid salt group is preferred to comprise a copolymerized ester, and the sulfonic acid salt group is preferred to comprise one or more member (s) selected from sulfonic acid metal salt group, sulfonic acid quaternary ammonium salt group and sulfonic acid quaternary sulfonium salt group.