abstract |
Provided is a process for producing a polyester composed mainly of a diol unit and a dicarboxylic acid unit, wherein at least one of the dicarboxylic acid and the diol used as raw materials of the polyester is obtained from a biomass resource and a nitrogen atom content in the polyester except nitrogen atoms contained in the covalently bonded functional groups in the molecule of the polyester is, in terms of a mass ratio, 0.01 ppm to 50 ppm relative to the polyester. |