| abstract |
(57) [Summary] [Structure] 80 to 100 mol% of lactic acid residues are contained, and the molar ratio (L / D) of L-lactic acid and D-lactic acid is 1 to 9, and the reduced viscosity (η SP / C ) is 0.4 to 1.5 dl / g, Biodegradable polyester (A) having Tg of 35 to 60 ° C And a biodegradable ink containing the ink pigment (B) and the solvent (C). Further, the above biodegradable ink wherein the biodegradable polyester (A) contains a residue of oxy acid other than lactic acid, succinic acid, propylene glycol or glycerin. [Effect] The biodegradable ink of the present invention has excellent ink performance and biodegradability. |