Polycarbonate diol and polyurethane using same

Abstract

The present invention relates to a polycarbonate diol comprising a structural unit derived from a compound represented by the following formula (A) and a structural unit derived from a compound represented by the following formula (B), wherein the hydroxyl value is from 20 to 450 mg-KOH/g: HO—R 1 —OH  (A) HO—R 2 —OH  (B) the glass transition temperature of said polycarbonate diol as measured by a differential operating calorimeter is −30° C. or less and the average carbon number of a dihydroxy compound obtained by hydrolyzing said polycarbonate diol is from 3 to 5.5.

1 : A polycarbonate diol, comprising:
 a structural unit derived from a compound of formula (A):
   HO—R 1 —OH  (A)
 
   
       where R 1  represents a substituted or unsubstituted divalent alkylene group having a carbon number of 3 to 5; and
 a structural unit derived from a compound of formula (B):
   HO—R 2 —OH  (B)
 
 
 
       where R 2  represents a substituted or unsubstituted divalent alkylene group having a carbon number of 8 to 20;
 wherein: 
 a hydroxyl value of the polycarbonate diol is 20 to 450 mg-KOH/g; and 
 a molar ratio or structural units derived from the compound of formula (A) to structural units derived from the compound of formula (B) in the polycarbonate diol is 50:50 to 99:1. 
 
     
     
         2 : The polycarbonate diol as claimed in  claim 1 , wherein a molar ratio of total of structural units derived from the compound of formula (A) and the compound of formula (B) to all structural units in the polycarbonate diol is at least 50 mol %. 
     
     
         3 . (canceled) 
     
     
         4 : The polycarbonate diol as claimed in  claim 1 , wherein an average carbon number of a dihydroxy compound obtained by hydrolyzing the polycarbonate diol is 4 to 5.5. 
     
     
         5 : The polycarbonate diol as claimed in  claim 1 , wherein the polycarbonate diol has a hydroxyl value of 20 to 60 mg-KOH/g. 
     
     
         6 : The polycarbonate diol as claimed in  claim 1 , wherein the compound of formula (A) is at least one compound selected from the group consisting of 1,3-propanediol and 1,4-butanediol. 
     
     
         7 : The polycarbonate diol as claimed in  claim 1  wherein the compound of formula (B) is at least one compound selected from the group consisting of 2-methyl-1,8-octanediol, 1,9-nonanediol, 1,10-decanediol, 1,11-undecanediol, and 1,12-dodecanediol. 
     
     
         8 : The polycarbonate diol as claimed in  claim 1 , wherein at least one of the compound of formula (A) and a compound of formula (B) is plant-derived. 
     
     
         9 : A polyurethane formed using the polycarbonate diol acclaimed in  claim 1 . 
     
     
         10 : A material produced using the polyurethane as claimed in  claim 9 , wherein the material is selected from the group consisting of an artificial leather, a synthetic leather, a coating material, a coating agent, an elastic fiber, an aqueous polyurethane coating material, a pressure sensitive adhesive, and an adhesive. 
     
     
         11 : An active energy ray-curable polymer composition formed using the polycarbonate diol as claimed in  claim 1 . 
     
     
         12 : A method for producing the polycarbonate diol as claimed in  claim 1 , comprising performing polycondensation through a transesterification reaction using the compound of formula (A), the compound of formula (B), and a carbonate compound, to produce the polycarbonate diol. 
     
     
         13 - 21 . (canceled)