MANUFACTURE OF NEGATIVE ELECTRODE ZINC PLATE FOR DRY BATTERY

摘要

PURPOSE:To prevent a negative electrode and a depolarizing mix from a coming into contact with each other, by making the negative electrode of a zinc plate provided with a layer of a prescribed saponified copolymer comprising vinyl acetate and unsaturated dicarboxylic acid. CONSTITUTION:A flat zinc plate or zinc can 1 is coated with a solution of a saponified copolymer comprising 50-99.8% by mol of vinyl acetate and 50-0.2% by mol of unsaturated dicarboxylic acid. 70% or more by mol of the vinyl acetate of the copolymer is saponified. The copolymer is made of the vinyl acetate and the unsaturated dicarboxylic acid such as maleic acid and fumaric acid or an ester of the unsaturated dicarboxylic acid, at a prescribed ratio therebetween. The copolymer is then saponified at a prescribed ratio. After the plate or can 1 is coated with the solution of the saponified copolymer, the coating solution is dried and heated to provide a saponified copolymer layer 2 firmly adhering to the plate or can b keep it from coming into contact with a depolarizing mix 3. Since the water-holding property and ion-permeability of the layer 2 are high, amalgamation is not needed.