Conductive composition, conductor and solid electrolytic capacitor using conductive composition

Abstract

A conductive composition according to the present invention contains a conductive polymer (A) having a sulfonic acid group and/or a carboxyl group; and an alkali metal hydroxide and/or an alkaline earth metal hydroxide (B). In such a conductive composition, the amount of the hydroxide (B) is set at 0.2˜0.65 mol per 1 mol of a repeating unit that contains a sulfonic acid group and/or a carboxyl group in the conductive polymer (A).

1 : A conductive composition, comprising:
 (A) a conductive polymer having a sulfonic acid group, a carboxyl group, or both a sulfonic acid group and a carboxyl group; and   (B) an alkali metal hydroxide, an alkaline earth metal hydroxide, or both an alkali metal hydroxide and an alkaline earth metal hydroxide, wherein   an amount of the hydroxide (B) is 0.2 to 0.65 mol per 1 mol of a repeating unit comprising the sulfonic acid group, the carboxyl group, or both, in the conductive polymer (A).   
     
     
         2 : A conductive composition, comprising:
 (A) a conductive polymer having a sulfonic acid group, a carboxyl group, or both a sulfonic acid group and a carboxyl group; and   (C) at least one compound selected from the group consisting of an acetate of an alkali metal, an acetate of an alkaline earth metal, a carbonate of an alkali metal, a carbonate of an alkaline earth metal, a phosphate of an alkali metal, a phosphate of an alkaline earth metal, a halide of an alkali metal, and a halide of an alkaline earth metal.   
     
     
         3 : A conductive composition, comprising:
 (A) a conductive polymer having a sulfonic acid group, a carboxyl group, or both a sulfonic acid group and a carboxyl group; and   (D) a compound comprising a basic group and at least two hydroxy groups in the same molecule and whose melting point is 30° C. or higher.   
     
     
         4 : A conductive composition, comprising:
 (A) a conductive polymer having a sulfonic acid group, a carboxyl group, or both a sulfonic acid group and a carboxyl group; and   (E) a compound comprising at least one each of a basic group and an acidic group in the same molecule.   
     
     
         5 : A conductive composition, comprising:
 (A) a conductive polymer having a sulfonic acid group, a carboxyl group, or both a sulfonic acid group and a carboxyl group; and   (F) a compound comprising at least two carboxylic acids or their salts in the same molecule.   
     
     
         6 : The conductive composition of  claim 1 , wherein
 the conductive polymer (A) has a repeating unit of formula (1):   
       
         
           
           
               
               
           
         
         wherein R 1  to R 4  are each independently a hydrogen atom, a linear or branched alkyl group having 1 to 24 carbon atoms, a linear or branched alkoxy group having 1 to 24 carbon atoms, an acidic group, a hydroxyl group, a nitro group or a halogen atom and wherein at least one of R 1  to R 4  is an acidic group or its salt. 
       
     
     
         7 : The conductive composition of  claim 1 , wherein the conductive polymer (A) has an area ratio (X/Y) of 1.20 or greater, calculated by an analytical method comprising:
 (I) preparing a test solution by dissolving the conductive polymer (A) at a solid concentration of 0.1% by mass in an eluent prepared to have a pH value of 10 or greater;   (II) obtaining a gel permeation chromatogram by measuring a molecular-weight distribution of the test solution using a gel permeation chromatograph of a polymer material analysis instrument;   (III) based on the chromatogram obtained in (II) above, converting a retention time to molecular weight (M) in terms of sodium polystyrene sulfonate;   (IV) determining an area (X) of a region where the molecular weight (M) in terms of sodium polystyrene sulfonate is 15000 Da or greater;   (V) determining an area (Y) of a region where the molecular weight (M) in terms of sodium polystyrene sulfonate is less than 15000 Da; and   (VI) calculating the area ratio (X/Y) of area (X) to area (Y).   
     
     
         8 : The conductive composition of  claim 6 , wherein the conductive polymer (A) has an area ratio (X/Y) of 1.20 or greater, calculated by an analytical method comprising:
 (I) preparing a test solution by dissolving the conductive polymer (A) at a solid concentration of 0.1% by mass in an eluent prepared to have a pH value of 10 or greater;   (II) obtaining a chromatogram by measuring a molecular-weight distribution of the test solution using a gel permeation chromatograph of a polymer material analysis instrument;   (III) based on the chromatogram obtained in (II) above, converting a retention time to molecular weight (M) in terms of sodium polystyrene sulfonate;   (IV) determining an area (X) of a region where the molecular weight (M) in terms of sodium polystyrene sulfonate is 15000 Da or greater;   (V) determining an area (Y) of a region where the molecular weight (M) in terms of sodium polystyrene sulfonate is less than 15000 Da; and   (VI) calculating the area ratio (X/Y) of area (X) to area (Y).   
     
     
         9 : A conductor comprising the conductive composition of  claim 1 . 
     
     
         10 : A conductor comprising the conductive composition of  claim 6 . 
     
     
         11 : A conductor comprising the conductive composition of  claim 7 . 
     
     
         12 : A conductor comprising the conductive composition of  claim 8 . 
     
     
         13 : A solid electrolytic capacitor comprising the conductive composition of  claim 1 . 
     
     
         14 : A solid electrolytic capacitor comprising the conductive composition of  claim 6 . 
     
     
         15 : A solid electrolytic capacitor comprising the conductive composition of  claim 7 . 
     
     
         16 : A solid electrolytic capacitor comprising the conductive composition of  claim 8 . 
     
     
         17 : The conductive composition of  claim 1 , wherein the conductive polymer (A) has a sulfonic acid group. 
     
     
         18 : The conductive composition of  claim 1 , wherein the conductive polymer (A) has a carboxyl group. 
     
     
         19 : The conductive composition of  claim 1 , wherein the hydroxide (B) is an alkali metal hydroxide. 
     
     
         20 : The conductive composition of  claim 1 , wherein the hydroxide (B) is an alkaline earth metal hydroxide.