Zinc acrylate and method for production thereof

Abstract

Zinc acrylate excelling in flowability is provided. It is produced by a method, characterized by dispersing zinc oxide in any of (a) an aliphatic hydrocarbon solvent, (b) a mixed solvent formed between an aliphatic hydrocarbon solvent and an aromatic hydrocarbon solvent, and (c) a mixed solvent formed between an aromatic hydrocarbon solvent and an alcohol and causing acrylic acid to react with said zinc oxide in said solvent. The obtained zinc acrylate refrains from undergoing secondary aggregation, excels in disintegrability and, when kneaded in a rubber composition, exhibits excellent dispersibility.

1 . A method for the production of zinc acrylate, which comprises dispersing zinc oxide in any of (a) an aliphatic hydrocarbon solvent, (b) a mixed solvent formed between an aliphatic hydrocarbon solvent and an aromatic hydrocarbon solvent, and (c) a mixed solvent formed between an aromatic hydrocarbon solvent and an alcohol and causing acrylic acid to react with said zinc oxide in said solvent.  
     
     
         2 . A method according to  claim 1 , wherein the reaction of said zinc oxide with acrylic acid in said solvent is performed in the presence of a higher fatty acid of 12-30 carbon atoms.  
     
     
         3 . A method according to  claim 1 , wherein said aliphatic hydrocarbon solvent is an alkane having 6-10 carbon atoms, said alcohol is an alcohol having 1-8 carbon atoms, and said aromatic hydrocarbon solvent is toluene or xylene.  
     
     
         4 . Zinc acrylate forming the crystals thereof having a long axis of not less than 5 μm and an aspect ratio in the range of 1-30.  
     
     
         5 . Zinc acrylate according to  claim 4 , further having a 50% particle diameter of not less than 6 μm.  
     
     
         6 . Zinc acrylate according to  claim 4 , wherein the ratio of passage of the crystals thereof through a sieve opening of 1 mm is not less than 90%.  
     
     
         7 . Zinc acrylate according to  claim 4 , wherein the solid disintegrating load of the crystals thereof is not more than 1.0 kg/cm 2 .  
     
     
         8 . Zinc acrylate according to  claim 4 , wherein the crystals thereof have a degree of compaction of not more than 50%.  
     
     
         9 . A zinc acrylate composition, comprising the zinc acrylate set forth in any of claims  4 - 8  and a zinc salt of a higher aliphatic acid of 12-30 carbon atoms.