Laminating adhesive

Abstract

[Solution to Problem] The laminating adhesive of the present invention includes a polyisocyanate component (A) and a polyol component (B), wherein the polyisocyanate component (A) contains a polyisocyanate (A1) that does not contain an aromatic ring, and the polyol component (B) contains a macropolyol (B1) that does not contain an aromatic ring but contains a cyclohexane ring.

1 . A laminating adhesive comprising:
 a polyisocyanate component (A) and a polyol component (B),   wherein the polyisocyanate component (A) contains a polyisocyanate (A1)) that does not contain an aromatic ring, and   the polyol component (B) contains a macropolyol (B1) that does not contain an aromatic ring but contains a cyclohexane ring.   
     
     
         2 . The laminating adhesive according to  claim 1 , wherein the cyclohexane ring concentration relative to the solid content of the polyisocyanate component (A) and the polyol component (B) in total is 2.5 mmol/g or less. 
     
     
         3 . The laminating adhesive according to  claim 1 , wherein the macropolyol (B1) is a polyurethane polyol (B1-1′) obtained by reaction of a crystalline polyol (B1-1a′) that does not contain an aromatic ring and is crystalline at normal temperature with a polyisocyanate (B1-1b) that does not contain an aromatic ring but contains a cyclohexane ring. 
     
     
         4 . The laminating adhesive according to  claim 3 , wherein the crystalline polyol (B1-1a′) contains a crystalline polycarbonate diol that is crystalline at normal temperature. 
     
     
         5 . The laminating adhesive according to  claim 4 , wherein the crystalline polycarbonate diol that is crystalline at normal temperature has a number average molecular weight of 1000 or less. 
     
     
         6 . The laminating adhesive according to  claim 1 , wherein the polyisocyanate component (A) does not contain a derivative of isophorone diisocyanate. 
     
     
         7 . The laminating adhesive according to  claim 6 , wherein the macropolyol (B1) is a polyurethane polyol (B1-1′) obtained by reaction of a polycarbonate diol that has a number average molecular weight of 5000 or less, does not contain an aromatic ring, and is crystalline at normal temperature, with a polyisocyanate (B1-1b) that does not contain an aromatic ring but contains a cyclohexane ring. 
     
     
         8 . The laminating adhesive according to  claim 1 , wherein the laminating adhesive is used for laminating outdoor composite sheets.