Adhesive composition, laminate and optical article comprising the laminate

Abstract

To provide an adhesive composition capable of firmly bonding polymer sheets together, comprising: (I) 100 parts by mass of an end-unreactive urethane urea resin; and (III) 4.0 to 20 parts by mass of a polyisocyanate compound having at least two isocyanate groups in the molecule, wherein the polyisocyanate compound (III) contains (IIIA) a polyisocyanate compound having an isocyanate group bonded to secondary carbon and (IIIB) a polyisocyanate compound having 4 to 30 carbon atoms in the molecule other than the component (IIIA), and the amount of the component (IIIB) is 10 to 500 parts by mass based on 100 parts by mass of the component (IIIA).

1 . An adhesive composition comprising:
 (I) 100 parts by mass of an end-unreactive urethane urea resin; and   (III) 4.0 to 20 parts by mass of a polyisocyanate compound having at least two isocyanate groups in the molecule, wherein   the polyisocyanate compound (III) contains (IIIA) a polyisocyanate compound having an isocyanate group bonded to secondary carbon and (IIIB) a polyisocyanate compound having 4 to 40 carbon atoms in the molecule other than the component (IIIA), and the amount of the component (IIIB) is 10 to 500 parts by mass based on 100 parts by mass of the component (IIIA).   
     
     
         2 . The adhesive composition according to  claim 1 , wherein the component (IIIB) is at least one polyisocyanate compound selected from the group consisting of hexamethylene diisocyanate, burette compounds of hexamethylene diisocyanate, isocyanurate compounds of hexamethylene diisocyanate and adducts compounds of hexamethylene diisocyanate. 
     
     
         3 . The adhesive composition according to  claim 1 , wherein the weight average molecular weight/number average molecular weight ratio which indicates the polydispersity of the component (I) is 1.6 to 2.4. 
     
     
         4 . The adhesive composition according to  claim 1  which further comprises (II) a coloring matter. 
     
     
         5 . The adhesive composition according to  claim 1 , wherein the component (II) contains a photochromic compound. 
     
     
         6 . A laminate comprising a pair of alicyclic polyamide resin sheets which are bonded together through an adhesive layer made of the adhesive composition of  claim 1 . 
     
     
         7 . A laminate comprising a polarizing sheet which is existent between a pair of alicyclic polyamide resin sheets and bonded to the alicyclic polyamide resin sheets through an adhesive layer made of the adhesive composition of  claim 1 . 
     
     
         8 . An optical article manufactured by further laminating a polyamide resin layer on the surface of at least one of the alicyclic polyamide resin sheets in the laminate of  claim 6 . 
     
     
         9 . A laminate comprising a polarizing sheet containing a dichroic dye which is existent between a pair of polymer sheets and bonded to the polymer sheets through an adhesive layer made of the adhesive composition of  claim 1 . 
     
     
         10 . Use of the adhesive composition of  claim 1  to form an adhesive layer in the production of a laminate comprising a pair of polymer sheets and a polarizing sheet containing a dichroic dye which is existent between the polymer sheets and bonded to the polymer sheets through the adhesive layer existent between the sheets. 
     
     
         11 . The adhesive composition according to  claim 2 , wherein the weight average molecular weight/number average molecular weight ratio which indicates the polydispersity of the component (I) is 1.6 to 2.4. 
     
     
         12 . The adhesive composition according to  claim 2  which further comprises (II) a coloring matter. 
     
     
         13 . The adhesive composition according to  claim 3  which further comprises (II) a coloring matter. 
     
     
         14 . The adhesive composition according to  claim 2 , wherein the component (II) contains a photochromic compound. 
     
     
         15 . The adhesive composition according to  claim 3 , wherein the component (II) contains a photochromic compound. 
     
     
         16 . The adhesive composition according to  claim 4 , wherein the component (II) contains a photochromic compound. 
     
     
         17 . A laminate comprising a pair of alicyclic polyamide resin sheets which are bonded together through an adhesive layer made of the adhesive composition of  claim 2 . 
     
     
         18 . A laminate comprising a pair of alicyclic polyamide resin sheets which are bonded together through an adhesive layer made of the adhesive composition of  claim 3 . 
     
     
         19 . A laminate comprising a pair of alicyclic polyamide resin sheets which are bonded together through an adhesive layer made of the adhesive composition of  claim 4 . 
     
     
         20 . A laminate comprising a pair of alicyclic polyamide resin sheets which are bonded together through an adhesive layer made of the adhesive composition of  claim 5 .