| abstract |
POLYESTER AND POLYURETHANE PRODUCTION METHODS. At the time of producing a polyester using a dicarboxylic acid component and a biomass resource-derived diol as starting materials, a polyester is efficiently produced with good color tone, as the biomass resource-derived starting material diol, a diol in which the content of a cyclic carbonyl compound having a carbon number of 5 or 6 is from 0.01 to 12 ppm by mass, is used and controlling the content of a cyclic carbonyl compound having a number of 5 or 6 carbon atoms in the starting material diol to be in a prescribed range, the color tone of the polyester is enhanced. |