Catalyst for dissociation of blocking agent for blocked isocyanates, and thermosetting composition containing said catalyst for dissociation of blocking agent

Abstract

A blocking agent dissociation catalyst for blocked isocyanates comprising a nitrogen-containing compound represented by Formula (1a):wherein D is represented by Formula (2):wherein R1, R2, R3, R4, and a are as described in the specification.

1 . A blocking agent dissociation catalyst for blocked isocyanates comprising a nitrogen-containing compound represented by Formula (1a): 
       
         
           
           
               
               
           
         
         wherein D is a nitrogen-containing organic group represented by Formula (2): 
       
       
         
           
           
               
               
           
         
         wherein R 1 , R 2 , R 3 , and R 4  are the same or different, and each represents a hydrocarbon group that may contain a heteroatom; some or all of R 1 , R 2 , R 3 , and R 4  may be bonded together to form a ring structure; X represents a nitrogen atom, an oxygen atom, or a sulfur atom; and a represents 0 or 1, wherein a is 1 when X represents a nitrogen atom, and a is 0 when X represents an oxygen atom or a sulfur atom. 
       
     
     
         2 - 5 . (canceled) 
     
     
         6 . The blocking agent dissociation catalyst for blocked isocyanates according to  claim 1 , wherein the nitrogen-containing organic group represented by Formula (2) is a nitrogen-containing organic group represented by the following Formula (2-1), (2-2), or (2-3): 
       
         
           
           
               
               
           
         
         wherein R 1 , R 4 , X, and a are as defined above; and R 7  and R 8  are the same or different, and each represents a hydrogen atom or a C 1 -C 6  hydrocarbon group that may contain a heteroatom; 
       
       
         
           
           
               
               
           
         
         wherein R 1 , R 4 , X, and a are as defined as above; and R 9  and R 10  are the same or different, and each represents a hydrogen atom or a C 1 -C 6  hydrocarbon group that may contain a heteroatom; or 
       
       
         
           
           
               
               
           
         
         wherein R 1 , R 4 , X, and a are as defined above; and R 11 , R 12 , R 13 , and R 14  are the same or different, and each represents a hydrogen atom or a C 1 -C 6  hydrocarbon group that may contain a heteroatom. 
       
     
     
         7 . The blocking agent dissociation catalyst for blocked isocyanates according to  claim 1 , wherein X is a nitrogen atom. 
     
     
         8 . A thermosetting composition comprising the blocking agent dissociation catalyst for blocked isocyanates according to  claim 1 , a blocked isocyanate, and a compound having an isocyanate-reactive group. 
     
     
         9 . The thermosetting composition according to  claim 8 , wherein the blocked isocyanate is a blocked isocyanate sealed with at least one blocking agent selected from the group consisting of alcohols, phenols, amines, lactams, oximes, ketoenols, and pyrazoles. 
     
     
         10 . The thermosetting composition according to  claim 8 , wherein the blocked isocyanate is a blocked isocyanate sealed with at least one blocking agent selected from the group consisting of lactams, oximes, and pyrazoles. 
     
     
         11 . A method for dissociating a blocking agent, comprising heating a blocked isocyanate in the presence of the blocking agent dissociation catalyst for blocked isocyanates according to  claim 1 . 
     
     
         12 . (canceled)