Biomass-resource-derived polyurethane, method for producing same, and biomass-resource-derived polyester polyol
The invention relates to a method for producing a biomass-resource-derived polyurethane, which comprises: reacting a dicarboxylic acid and an aliphatic diol to produce a polyester polyol; and reacting the polyester polyol and a polyisocyanate compound, wherein the dicarboxylic acid contains at least one component derived from biomass resources, a content of an organic acid in the dicarboxylic acid is more than 0 ppm and not more than 1,000 ppm relative to the dicarboxylic acid, and a pKa value of the organic acid at 25° C. is not more than 3.7.
1. A biomass-resource-derived polyester polyol, comprising, in reacted form:
an organic acid comprising three or more active hydrogen groups per molecule and having a pKa value at 25° C. of not more than 3.7;
a dicarboxylic acid unit; and
an aliphatic diol unit,
wherein the dicarboxylic acid unit comprises a dicarboxylic acid other than the organic acid, and wherein at least a portion of the dicarboxylic acid is derived from biomass resources,
wherein a content of the organic acid is more than 0% by mole to not more than 0.09% by mol relative to the dicarboxylic acid unit, and
wherein the biomass-resource-derived polyester polyol has a number average molecular weight of 500 or more and not more than 4,000.
2. The biomass-resource-derived polyester polyol of claim 1 , wherein the dicarboxylic acid derived from biomass resources is succinic acid.
3. The biomass-resource-derived polyester polyol of claim 1 , wherein the organic acid is malic acid, tartaric acid, citric acid, or any combination thereof.
4. The biomass-resource-derived polyester polyol of claim 1 , having a number average molecular weight of 500 or more and not more than 3,000.
5. The biomass-resource-derived polyester polyol of claim 1 , wherein the dicarboxylic acid comprises a second dicarboxylic acid other than the organic acid, and the second dicarboxylic acid is petroleum-derived.