Polylactic acid type polyester resin, polylactic acid type polyester resin solution, polylactic acid type polyester resin aqueous dispersion, and polylactic acid type polyester resin aqueous dispersion production method

摘要

[Problem] To provide: a biodegradable polylactide polyester resin, which has a high biomass level and for which the results of the biodegradability test described in ISO 14855 (JISK 6953) "Determination of ultimate aerobic biodegradability and degree of degradation under controlled composting conditions" but with temperature conditions of 28±2°C are at least 90% by the 365th day in said determination method; a resin varnish composition, aqueous dispersion resin composition, adhesive composition, ink, laminate formed using adhesive/ink, and packaging material comprising same; and an aqueous dispersion manufacturing method. [Solution] A biodegradable polylactide polyester resin for which the acid value is 200-2,500 eq/106 g, the number average molecular weight is 2,000- 50,000, Tg is -50~40°C, lactic acid content is at least 40 weight%, and the results of the biodegradability test described in ISO 14855 (JISK 6953) "Determination of ultimate aerobic biodegradability and degree of degradation under controlled composting conditions" but with temperature conditions of 28±2°C are at least 90% by the 365th day in said determination method.