Compositions – Preservative agents – Anti-corrosion
Patent
1979-07-23
1981-05-26
Lovering, Richard D.
Compositions
Preservative agents
Anti-corrosion
8526, 71 64F, 106308M, 252522A, 282 275, 424 33, 428307, 428914, B01J 1302
Patent
active
042697298
ABSTRACT:
Microcapsules having walls formed from polyvinyl alcohol are prepared by dispersing a substantially water insoluble nuclear material in an aqueous solution of a polyvinyl alcohol polymer, which solution has a cloud point, phase separating and depositing a concentrated aqueous solution of the polyvinyl alcohol polymer as a separated phase around said nuclear material from the bulk continuous phase by maintaining the temperature of the system above the cloud point of the aqueous polyvinyl alcohol polymer solution, and subjecting the phase separated solution to conditions which substantially solidify or gel said polyvinyl alcohol polymer in said concentrated aqueous solution of said separated phase around said nuclear material but which do not substantially solidify or gel the polyvinyl alcohol in the diluted aqueous solution of the continuous phase.
REFERENCES:
patent: 3258442 (1966-06-01), Sinclair
patent: 3574133 (1971-04-01), Bayless et al.
patent: 3627693 (1971-12-01), Scarpelli
patent: 3687865 (1972-08-01), Katay ama et al.
patent: 3812056 (1974-05-01), de la Torriente et al.
patent: 3875074 (1975-04-01), Vassiliades et al.
Kajitani Koichi
Maruyama Hitoshi
Shiraishi Makoto
Kuraray Co. Ltd.
Lovering Richard D.
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