Rubber-metal adhesion promoter, rubber composition, and tire

Abstract

A rubber-metal adhesion promoter characterized by including: a metal salt (1) of a carboxylic acid which is a metal salt of an aliphatic carboxylic acid having 2 to 25 carbon atoms and in which the metal is bismuth, copper, antimony, silver or niobium; or a compound (2) represented by the following general formula (A): [wherein Z represents a structure selected from the following formulae (z-1) to (z-4); M represents bismuth, copper, antimony, silver or niobium; (RCOO) represents a residue of an aliphatic carboxylic acid having 2 to 25 carbon atoms; and x represents the valence of M minus 1].

1 . A rubber-metal adhesion promoter comprising:
 a metal salt (1) of a carboxylic acid which is a metal salt of an aliphatic carboxylic acid having 2 to 25 carbon atoms and in which the metal is bismuth, copper, antimony, silver or niobium; or   a compound (2) represented by the following general formula (A):
   [Chemical Formula 1] 
   [(RCOO) x MO] 3 Z  (A)
 
   [wherein Z represents a structure selected from the following formulae (z-1) to (z-4);   
       
         
           
           
               
               
           
         
         wherein M represents bismuth, copper, antimony, silver or niobium; (RCOO) represents a residue of an aliphatic carboxylic acid having 2 to 25 carbon atoms; and x represents an integer of {(valence of M)−1}]. 
       
     
     
         2 . The rubber-metal adhesion promoter according to  claim 1 ,
 wherein said metal salt (1) of the carboxylic acid is included, and the metal in the metal salt (1) of the carboxylic acid is bismuth or copper.   
     
     
         3 . The rubber-metal adhesion promoter according to  claim 1 ,
 wherein said metal salt (1) of the carboxylic acid is included, and   the aliphatic carboxylic acid in the metal salt (1) of the carboxylic acid is an aliphatic monocarboxylic acid or an aliphatic dicarboxylic acid.   
     
     
         4 . The rubber-metal adhesion promoter according to  claim 3 ,
 wherein the aliphatic carboxylic acid in said metal salt (1) of the carboxylic acid is a saturated aliphatic monocarboxylic acid having 2 to 20 carbon atoms.   
     
     
         5 . The rubber-metal adhesion promoter according to  claim 4 ,
 wherein the carboxylic acid in said metal salt (1) of the carboxylic acid is 2-ethylhexanoic acid, neodecanoic acid, hexadecanoic acid or octadecanoic acid.   
     
     
         6 . The rubber-metal adhesion promoter according to  claim 1 ,
 wherein said compound (2) is included, and   M in the compound (2) is bismuth or copper.   
     
     
         7 . The rubber-metal adhesion promoter according to  claim 1 ,
 wherein said compound (2) is included, and   Z in the compound (2) is a structure represented by said formula (z-1).   
     
     
         8 . The rubber-metal adhesion promoter according to  claim 1 ,
 wherein said compound (2) is included, and   (RCOO) in the compound (2) is a residue of a saturated aliphatic monocarboxylic acid having 2 to 20 carbon atoms.   
     
     
         9 . The rubber-metal adhesion promoter according to  claim 8 ,
 wherein (RCOO) in said compound (2) is a residue of 2-ethylhexanoic acid, a residue of neodecanoic acid, a residue of hexadecanoic acid or a residue of octadecanoic acid.   
     
     
         10 . The rubber-metal adhesion promoter according to  claim 1 , which is used for adhering rubber and a steel cord. 
     
     
         11 . A rubber composition comprising:
 the rubber-metal adhesion promoter according to  claim 1 ; and   a rubber component.   
     
     
         12 . The rubber composition according to  claim 11 , which contains 0.01 to 10 parts by mass of said rubber-metal adhesion promoter with respect to 100 parts by mass of said rubber component. 
     
     
         13 . A tire comprising a steel cord/rubber composite including the rubber composition according to  claim 11  and a steel cord. 
     
     
         14 . A rubber composition comprising:
 the rubber-metal adhesion promoter according to  claim 2 ; and   a rubber component.   
     
     
         15 . A rubber composition comprising:
 the rubber-metal adhesion promoter according to  claim 3 ; and   a rubber component.   
     
     
         16 . A rubber composition comprising:
 the rubber-metal adhesion promoter according to  claim 4 ; and   a rubber component.   
     
     
         17 . A rubber composition comprising:
 the rubber-metal adhesion promoter according to  claim 5 ; and   a rubber component.   
     
     
         18 . A rubber composition comprising:
 the rubber-metal adhesion promoter according to  claim 6 ; and   a rubber component.   
     
     
         19 . A rubber composition comprising:
 the rubber-metal adhesion promoter according to  claim 7 ; and   a rubber component.   
     
     
         20 . A rubber composition comprising:
 the rubber-metal adhesion promoter according to  claim 8 ; and   a rubber component.