Production of microcapsules by simple coacervation
AssigneeLion Corporation
InventorsMasahiro Takizawa, Hideyuki Takahashi
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Abstract
A microcapsule containing hydrous composition containing an electrolyte and microcapsules coated with a water-soluble polymer which undergoes phase separation by the action of the electrolyte. The electrolyte causes the above-mentioned phase separation comprising 5% to 80% by weight of water and water-soluble components.
Claims3
A process for producing microcapsules according to a simple coacervation method by dispersing a capsule core material substantially insoluble in water in an aqueous solution containing a first water-soluble polymer selected from the group consisting of polyvinyl alcohol, sulfated cellulose, water-soluble nylon, gelatin, and poly(meth)acrylic acid and also adding inorganic or organic salt thereto, which comprises incorporating a second water-soluble polymer which undergoes substantially no phase separation with the above inorganic or organic salt together with the first water-soluble polymer in said aqueous solution, the concentration of the second water-soluble polymer in the aqueous solution being 0.1% to 10% by weight and the amount of the weight ratio of second water-soluble polymer added to the first water-soluble polymer in the aqueous solution is 0.05 to 5 parts by weight, per 1 part by weight of the first water-soluble polymer.
Dependencies are inferred from the claim text.