Curable resin composition

Abstract

The present invention provides a curable resin composition comprising: (A) an acryl resin having (a) a carboxyl group originating in a carboxyl group-containing polymerizable unsaturated monomer selected from acrylic acid, methacrylic acid, maleic acid and itaconic acid and (b) a carboxyl group originating in a carboxyl group-containing polymerizable unsaturated monomer having a polymerizable carbon-carbon double bond and a carboxyl group separated from the double bond by at least 6 carbon atoms, (B) an epoxy group-containing acryl resin and (C) a curing catalyst.

1 . A curable resin composition comprising: 
 (A) a carboxyl group-containing acryl resin having (a) a carboxyl group originating in a carboxyl group-containing polymerizable unsaturated monomer selected from acrylic acid, methacrylic acid, maleic acid and itaconic acid and (b) a carboxyl group originating in a carboxyl group-containing polymerizable unsaturated monomer having a polymerizable carbon-carbon double bond and a carboxyl group separated from the double bond by at least 6 carbon atoms,    (B) an epoxy group-containing acryl resin and    (C) a curing catalyst.    
     
     
         2 . The resin composition as described in  claim 1 , wherein the monomer (b) is a carboxyl group-containing polymerizable unsaturated monomer having a polymerizable carbon-carbon double bond and a carboxyl group separated from the double bond by 6 to 25 carbon atoms.  
     
     
         3 . The resin composition as described in  claim 1 , wherein the component (A) is obtained by copolymerizing the carboxyl group-containing polymerizable unsaturated monomer (a), the carboxyl group-containing polymerizable unsaturated monomer (b) and an acryl base monomer (c) and, if necessary, other polymerizable monomer (d).  
     
     
         4 . The resin composition as described in  claim 3 , wherein plural carboxyl group-containing polymerizable unsaturated monomers in which atomic groups present between a polymerizable carbon-carbon double bond and a carboxyl group have carbon atom numbers different from each other are used as the carboxyl group-containing polymerizable unsaturated monomer (b).  
     
     
         5 . The resin composition as described in  claim 3 , wherein plural carboxyl group-containing polymerizable unsaturated monomers in which atomic groups present between a polymerizable carbon-carbon double bond and a carboxyl group have carbon atom numbers different from each other are separately used as the carboxyl group-containing polymerizable unsaturated monomer (b), and the resulting plural carboxyl group-containing acryl resins are used as the component (A).  
     
     
         6 . The resin composition as described in  claim 1 , wherein the component (A) has an acid value of 30 to 150 mg KOH/g based on the monomer (a).  
     
     
         7 . The resin composition as described in  claim 1 , wherein the component (A) has an acid value of 30 to 170 mg KOH/g based on the monomer (b).  
     
     
         8 . The resin composition as described in  claim 1 , wherein the component (A) has a total acid value of 100 to 200 mg KOH/g.  
     
     
         9 . A curable resin composition comprising: 
 (D) a carboxyl group-containing acryl resin having (a) a carboxyl group originating in a carboxyl group-containing polymerizable unsaturated monomer selected from acrylic acid, methacrylic acid, maleic acid and itaconic acid, (b) a carboxyl group originating in a carboxyl group-containing polymerizable unsaturated monomer having a polymerizable carbon-carbon double bond and a carboxyl group separated from the double bond by at least 6 carbon atoms and (e) a carboxyl group originating in a semi-esterification product of a polymerizable unsaturated dibasic acid anhydride,    (B) an epoxy group-containing acryl resin and    (C) a curing catalyst.    
     
     
         10 . The resin composition as described in  claim 9 , wherein the monomer (b) is a carboxyl group-containing polymerizable unsaturated monomer having a polymerizable carbon-carbon double bond and a carboxyl group separated from the double bond by 6 to 25 carbon atoms.  
     
     
         11 . The resin composition as described in  claim 9 , wherein the component (D) is obtained by copolymerizing the carboxyl group-containing polymerizable unsaturated monomer (a), the carboxyl group-containing polymerizable unsaturated monomer (b), the semi-esterification product (e) of a polymerizable unsaturated dibasic acid anhydride and an acryl base monomer (c) and, if necessary, other polymerizable monomer (d).  
     
     
         12 . The resin composition as described in  claim 11 , wherein plural carboxyl group-containing polymerizable unsaturated monomers in which atomic groups present between a polymerizable carbon-carbon double bond and a carboxyl group have carbon atom numbers different from each other are used as the carboxyl group-containing polymerizable unsaturated monomer (b).  
     
     
         13 . The resin composition as described in  claim 11 , wherein plural carboxyl group-containing polymerizable unsaturated monomers in which atomic groups present between a polymerizable carbon-carbon double bond and a carboxyl group have carbon atom numbers different from each other are separately used as the carboxyl group-containing polymerizable unsaturated monomer (b), and the resulting plural carboxyl group-containing acryl resins are used as the component (D).  
     
     
         14 . The resin composition as described in  claim 9 , wherein the component (D) has an acid value of 30 to 150 mg KOH/g based on the monomer (a).  
     
     
         15 . The resin composition as described in  claim 9 , wherein the component (D) has an acid value of 30 to 170 mg KOH/g based on the monomer (b).  
     
     
         16 . The resin composition as described in  claim 9 , wherein the component (D) has an acid value of 1 to 60 mg KOH/g based on the semi-esterification product (e).  
     
     
         17 . The resin composition as described in  claim 9 , wherein the component (D) has a total acid value of 100 to 200 mg KOH/g.  
     
     
         18 . The resin composition as described in  claim 1  or  9 , wherein the component (B) is obtained by copolymerizing an epoxy group-containing polymerizable monomer and an acryl base monomer and, if necessary, a hydroxyl group-containing polymerizable monomer and/or other polymerizable monomer.  
     
     
         19 . The resin composition as described in  claim 1  or  9 , wherein the component (B) has a weight average molecular weight of 2000 to 50000 and an epoxy equivalent of 50 to 1000.  
     
     
         20 . The resin composition as described in  claim 1  or  9 , wherein the component (C) comprises a combination of a quaternary ammonium salt and a phosphate base compound.  
     
     
         21 . The resin composition as described in  claim 1 , comprising 20 to 80% by weight of the component (A) and 80 to 20% by weight of the component (B) based on the total solid matter weight of the component (A) and the component (B).  
     
     
         22 . The resin composition as described in  claim 1 , comprising 0.1 to 5 parts by weight of the component (C) per 100 parts by weight of the total solid matter of the component (A) and the component (B).  
     
     
         23 . The resin composition as described in  claim 9 , comprising 20 to 80% by weight of the component (D) and 80 to 20% by weight of the component (B) based on the total solid matter weight of the component (D) and the component (B).  
     
     
         24 . The resin composition as described in  claim 1 , comprising 0.1 to 5 parts by weight of the component (C) per 100 parts by weight of the total solid matter of the component (D) and the component (B).  
     
     
         25 . A top coating material comprising the resin composition as described in  claim 1  or  9 .