Method of producing sheet-formed bactericidal article
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsAtsushi Nishino, Kazunori Sonetake, Hiroshi Kumano
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Abstract
A sheet of partially acetalled polyvinyl alcohol is used as the substratum of the article, and a sparingly soluble silver halide is precipitated on the sheet from an aqueous phase such as an ammoniacal silver chloride solution.
Claims6
A method of producing a sheet-formed bactericidal article for the sterilization of dechlorinated potable water in a water purifier, the article consisting of a cloth substrate and fine particles of silver chloride firmly deposited on the surfaces of the fiber filaments of the cloth substrate, the method comprising the steps of;
- soaking a non-woven cloth sheet of partially acetal-formed polyvinyl alcohol in an aqueous solution of silver nitrate in the concentration range from 1 to 20% by weight, the hydroxyl radicals in said partially acetal-formed polyvinyl alcohol having been subjected to partial condensation with an aldehyde to form acetal radicals ##STR3## such that the extent of the acetal formation is less than 50 mol% of polyvinyl alcohol;
- drying the soaked sheet to remove water;
- and
- soaking the dried sheet in an aqueous solution of sodium chloride in the concentration range from 1 to 20% by weight to convert said silver nitrate adhering to said sheet into silver chloride.
A method of producing a sheet-formed bactericidal article for the sterilization of dechlorinated potable water in a water purifier, the article consisting of a cloth substrate and fine particles of silver chloride firmly deposited on the surfaces of the fiber filaments of the cloth substrate, the method comprising the steps of;
- preparing a silver amine complex solution by dissolving 0.1 to 20% by weight of silver chloride in an aqueous ammonia solution ranging in concentration from 1 to 14% by weight;
- soaking a non-woven cloth sheet of partially acetal formed polyvinyl alcohol in said solution, the hydroxyl radicals in said partially acetal-formed polyvinyl alcohol having been subjected to partial condensation with an aldehyde to form acetal radicals ##STR4## such that the extent of the acetal formation is less than 50 mol% of polyvinyl alcohol;
- and
- drying the soaked sheet to evaporate water and ammonia.
Dependencies are inferred from the claim text.