Polyurethane resin

Abstract

Disclosed is a polyurethane resin which is obtained by a reaction between a polyisocyanate component, which contains 1,4-bis(isocyanatomehyl)cyclohexane including not less than 80% by mole of trans isomers, and an active hydrogen compound component.

1 . A polyurethane resin obtained by a reaction between a polyisocyanate component comprising 1,4-bis(isocyanatomethyl)cyclohexane consisting of 80-93% by mole of trans isomers and the remaining 7-20% by mole of cis isomers, wherein the cis and the trans isomers equal 100% by mole, and an active hydrogen compound component, wherein the polyisocyanate component contains not less than 50% by mole of the 1,4-bis(isocyanatomethyl)cyclohexane. 
     
     
         2 . The polyurethane resin according to  claim 1 , being a molding resin. 
     
     
         3 . The polyurethane resin according to  claim 1 , being an optical polyurethane resin. 
     
     
         4 . The polyurethane resin according to  claim 3 , wherein the active hydrogen compound component is a polyol component having a hydroxyl value of 280 to 1240 mg KOH/g and an average functionality of more than 2 and less than 5. 
     
     
         5 . The polyurethane resin according to  claim 1 , wherein
 the polyisocyanate component comprises a polyisocyanate containing the 1,4-bis (isocyanatomethyl)cyclohexane;   the active hydrogen compound component comprises a high-molecular-weight polyol, an active hydrogen compound comprising a hydrophilic group, and a chain extender; and   first, the polyisocyanate is allowed to react with the high-molecular-weight polyol and the active hydrogen compound comprising a hydrophilic group to prepare an isocyanate group-terminated prepolymer, and   subsequently, the isocyanate group-terminated prepolymer and   the chain extender are allowed to react to thereby obtain an aqueous polyurethane resin.   
     
     
         6 . A film, being made of the polyurethane resin as defined in  claim 5 . 
     
     
         7 . An artificial and synthetic leather, using the polyurethane resin as defined in  claim 5 . 
     
     
         8 . The polyurethane resin according to  claim 1 , being a granular polyurethane resin. 
     
     
         9 . The polyurethane resin according to  claim 8 , being used for slush molding. 
     
     
         10 . A slush molded article, being obtained by slush molding of the polyurethane resin as defined in  claim 8 . 
     
     
         11 . The polyurethane resin according to  claim 1 , being a polyurethane resin for elastic molding. 
     
     
         12 . An elastic molded article using the polyurethane resin as defined in  claim 11 . 
     
     
         13 . The polyurethane resin according to  claim 1 , wherein the polyisocyanate component further comprises an isocyanaurate-modified product at least either one of alicyclic polyisocyanate and aralkyl polyisocyanate, and
 the polyurethane resin is a polyurethane resin for reaction injection molding.   
     
     
         14 . The polyurethane resin according to  claim 13 , wherein the alicyclic polyisocyanate and the aralkyl polyisocyanate are at least one kind selected from the group consisting of 1,3-bis(isocyanatomethyl)cyclohexane, 1,4-bis(isocyanatomethyl)cyclohexane, 2,5-di(isocyanatomethyl)bicyclo[2,2,1)heptane, 2,6-di(isocyanatomethyl)bicyclo[2,2,1)heptane, isophorone diisocyanate, 1,3-bis(isocyanatomethyl)benzene, and 1,4-bis(isocyanatomethyl)benzene. 
     
     
         15 . A reaction injection molded article being formed from the polyurethane resin as defined in  claim 13 . 
     
     
         16 . The polyurethane resin according to  claim 1 , wherein the polyisocyanate component comprises
 an allophanate-modified product of the 1,4-bis(isocyanatomethyl)cyclohexane and   an isocyanurate-modified product of the 1,4-bis(isocyanatomethyl)cyclohexane   so as to have an allophanate/isocyanurate composition ratio of 50/50 to 100/0, to be prepared as a two-part curing polyurethane resin.   
     
     
         17 . The polyurethane resin according to  claim 1 ,
 further comprising a foaming agent and   being obtained as a polyurethane foam by foaming and reaction.   
     
     
         18 . The polyurethane resin according to  claim 16 , wherein the active hydrogen compound component is a polyol component, the polyol component having a hydroxyl value of 10 to 120 mg KOH/g and a primary hydroxyl group at its molecular end of not less than 40% by mole or more. 
     
     
         19 . The polyurethane resin according to  claim 16 , being used as a molded article for clothing, sanitary, or shoes. 
     
     
         20 . The polyurethane resin according to  claim 1 , wherein the polyisocyanate component consists of the 1,4-bis(isocyanatomethyl)cyclohexane, and a polyisocyanate used in combination with the 1,4-bis(isocyanatomethyllcyclohexane,
 the polyisocyanate used in combination being selected from the group consisting of 3-isocyanatomethyl-3,5,5-trimethyl cyclohexyl isocyanate, 4,4′-methylene-bis(cyclohexyl isocyanate), 1,4-cyclohexane diisocyanate, 1,3-bis(isocyanatomethyl)cyclohexane, 2,5- or 2,6-bis(isocyanatomethyl)norbornane and mixtures thereof, 1,5-pentamethylene diisocyanate, and 1,6-hexamethylene diisocyanate, and derivatives of these polyisocyanates.