Acrylic elastomer composition

Abstract

An acrylic elastomer composition comprising (A) a halogen-containing acrylic elastomer, (B) a polyvalent carboxylic acid, (C) a quaternary onium salt and (D) a hydrotalcite can be vulcanized within a shorter vulcanization time to give a vulcanization product having distinguished normal state physical properties and compression set characteristics, even without any secondary vulcanization.

What is claimed is:  
     
         1 . An acrylic elastomer composition, which comprises (A) a halogen-containing acrylic elastomer, (B) a polyvalent carboxylic acid, (C) a quaternary onium salt and (D) a hydrotalcite.  
     
     
         2 . An acrylic elastomer composition according to  claim 1 , wherein the polyvalent carboxylic acid is an aliphatic polyvalent carboxylic acid having 4 to 30 carbon atoms, alcyclic polyvalent carboxylic acid, aromatic polyvalent carboxylic acid or anhydride thereof.  
     
     
         3 . An acrylic elastomer composition according to  claim 1 , wherein the polyvalent carboxylic acid is used in an amount of 0.1 to 10 parts by weight on the basis of 100 parts by weight of the halogen-containing acrylic elastomer.  
     
     
         4 . An acrylic elastomer composition according to  claim 1 , wherein the quaternary onium salt is used in an amount of 0.1 to 10 parts by weight of the halogen-containing acrylic elastomer.  
     
     
         5 . An acrylic elastomer composition according to  claim 1 , wherein the hydrotalcite is used in an amount of 0.5 to 20 parts by weight on the basis of 100 parts by weight of the halogen-containing acrylic elastomer.  
     
     
         6 . An acrylic elastomer composition according to  claim 1 , wherein a higher fatty acid polyhydric alcohol ester or a higher aliphatic amine is further contained as a lubricant.  
     
     
         7 . An acrylic elastomer composition according to  claim 6 , wherein the higher fatty acid polyhydric alcohol ester or the higher aliphatic amine is used in an amount of 0.1 to 10 parts by weight of the halogen-containing acrylic elastomer.  
     
     
         8 . An acrylic elastomer composition according to  claim 1 , wherein ureas are further contained as a vulcanization retardant.  
     
     
         9 . An acrylic elastomer composition according to  claim 8 , wherein the ureas are used in an amount of 0.1 to 10 parts by weight of the halogen-containing acrylic elastomer.  
     
     
         10 . A vulucanization molding product obtained by vulcanization molding of an acrylic elastomer composition comprising (A) a halogen-containing acrylic elastomer, (B) a polyvalent carboxylic acid, (C) a quaternary onium salt and (D) a hydrotalcite without any secondary vulcanization.  
     
     
         11 . A vulcanization molding product according to  claim 10 , wherein the acrylic elastomer composition further containing a higher fatty acid polyhydric alcohol ester or a higher aliphatic amine as a lubricant is used.  
     
     
         12 . A vulcanization molding product according to  claim 10 , wherein the acrylic elastomer composition further containing ureas as a vulcanization retardant are used.