Polyester polyol composition for polyurethane, composition for polyurethane foam, polyurethane resin, and polyurethane foam

Abstract

The present invention provides a polyester polyol, preferably a plant-derived polyester polyol, suitable for a composition for polyurethane foam that contributes to the reduction of load on the environment and has a good balance of high resilience, moderate hardness, and high durability as a cushioning material for vehicle seat cushions. A polyester polyol having a hydroxyl value in the range of 15 to 100 mgKOH/g according to the present invention is produced by a condensation of raw materials comprising at least one selected from the group consisting of fatty acids having a hydroxy group and fatty acid esters having a hydroxy group with a polyhydric alcohol having an average number of functional groups of more than three but not more than eight. The raw materials contain 90% to 100% by mass of a fatty acid having a hydroxy group and a fatty acid ester having a hydroxy group in total.

1 . A polyester polyol (A) that is produced by a condensation of raw materials comprising at least one selected from the group consisting of fatty acids having a hydroxy group and fatty acid esters having a hydroxy group with a polyhydric alcohol having an average number of functional groups of more than three but not more than eight and that has a hydroxyl value in the range of 15 to 100 mgKOH/g,
 wherein the raw materials comprise 90% to 100% by mass of a fatty acid having a hydroxy group and a fatty acid ester having a hydroxy group in total.   
     
     
         2 . A polyester polyol (A) that is produced by a condensation of raw materials comprising at least one selected from the group consisting of fatty acids having a hydroxy group and fatty acid esters having a hydroxy group with a polyhydric alcohol having an average number of functional groups of more than three but not more than eight and that has a hydroxyl value in the range of 15 to 100 mgKOH/g,
 wherein the raw materials comprise 90% to 100% by mass of the following (I), (II), or (III):   (I) one type of fatty acid having a hydroxy group,   (II) one type of fatty acid ester having a hydroxy group, and   (III) a mixture of (i) one type of fatty acid having a hydroxy group and an ester derived from (i) the one type of fatty acid having a hydroxy group.   
     
     
         3 . The polyester polyol (A) according to  claim 1 , wherein the at least one selected from the group consisting of fatty acids having a hydroxy group and fatty acid esters having a hydroxy group has a carbon-carbon double bond. 
     
     
         4 . The polyester polyol (A) according to any one of  claim 1 , wherein the at least one selected from the group consisting of fatty acids having a hydroxy group and fatty acid esters having a hydroxy group is derived from castor oil. 
     
     
         5 . The polyester polyol (A) according to  claim 1 , wherein
 the fatty acid having a hydroxy group is ricinoleic acid, and   the fatty acid ester having a hydroxy group is a ricinoleate.   
     
     
         6 . The polyester polyol (A) according to  claim 1 , wherein the mass ratio of the polyhydric alcohol to the total amount of the fatty acid having a hydroxy group and the fatty acid ester having a hydroxy group ranges from 1:1 to 1:100. 
     
     
         7 . A composition for polyurethane, comprising a polyol (P) containing a polyester polyol (A) according to  claim 1 , a catalyst, and a polyisocyanate,
 wherein the polyester polyol (A) accounts for 10% to 95% by mass of the polyol (P).   
     
     
         8 . A composition for polyurethane foam, comprising the composition for polyurethane according to  claim 7 , a foam stabilizer, and a blowing agent. 
     
     
         9 . The composition for polyurethane according to  claim 7 , wherein the polyol (P) further comprises a low-monool-content polyol (B) having a total degree of unsaturation of 0.035 meq/g or less. 
     
     
         10 . The composition for polyurethane foam according to  claim 8 , wherein the polyol (P) further comprises a low-monool-content polyol (B) having a total degree of unsaturation of 0.035 meq/g or less. 
     
     
         11 . A polyurethane resin produced by a reaction of a composition for polyurethane according to  claim 7 . 
     
     
         12 . A polyurethane foam produced by a reaction of a composition for polyurethane foam according to  claim 8 .