Biomass-resource-derived polyester and production process thereof

Abstract

The present invention provides a resin capable of contributing greatly to solve environmental problems and problems related to exhaustion of fossil fuel resources and having physical properties suited for practical use. The polyester according to the present invention has a diol and a dicarboxylic acid as constituent components and has an amount of terminal acid of 50 equivalents/metric ton or less.

1 - 18 . (canceled) 
     
     
         19 . A biomass-resource derived diol comprising a nitrogen atom in an amount of 0.01 ppm to 50 ppm. 
     
     
         20 . The biomass-resource derived diol of  claim 19 , which is an aliphatic diol having 10 or less carbon atoms. 
     
     
         21 . The biomass-resource derived diol of  claim 19 , wherein a carbon number of the diol is an even number. 
     
     
         22 . The biomass-resource derived diol of  claim 20 , wherein a carbon number of the diol is an even number. 
     
     
         23 . The biomass-resource derived diol of  claim 19 , which further comprises a sulfur atom in an amount of 0.001 ppm to 10 ppm. 
     
     
         24 . The biomass-resource derived diol of  claim 20 , which further comprises a sulfur atom in an amount of 0.001 ppm to 10 ppm. 
     
     
         25 . A polyester comprising: a diol unit containing the diol of  claim 19 ; and a dicarboxylic acid unit, wherein a nitrogen content in the polyester, except nitrogen atoms covalently bonded in the functional groups of the polyester, is 0.01 ppm to 50 ppm. 
     
     
         26 . A polyester comprising: a diol unit containing the diol of  claim 20 ; and a dicarboxylic acid unit, wherein a nitrogen content in the polyester, except nitrogen atoms covalently bonded in the functional groups of the polyester, is 0.01 ppm to 50 ppm. 
     
     
         27 . The polyester of  claim 25 , which further comprises at least one polyfunctional compound unit selected from the group consisting of tri- or higher functional polyhydric alcohols, tri- or higher functional polycarboxylic acids, and tri- or higher functional oxycarboxylic acids. 
     
     
         28 . The polyester of  claim 26 , which further comprises at least one polyfunctional compound unit selected from the group consisting of tri- or higher functional polyhydric alcohols, tri- or higher functional polycarboxylic acids, and tri- or higher functional oxycarboxylic acids.