PRODUCTION OF MICROCAPSULE

PURPOSE:To efficiently produce the titled microcapsule by emulsifying a hydrophobic liq. contg. a polyvalent isocyanate in the hydrophilic soln. of a specified polyvinyl alcohol to form a synthetic polymeric substance at the interface between the liq. droplets. CONSTITUTION:A polyvinyl alcohol havin...

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Bibliographische Detailangaben
Hauptverfasser:	IRII SHINSUKE, SHIOZAKI TOMOHARU
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY COLOUR PRINTING LINING MACHINES PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL PRINTING PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES STAMPS THEIR RELEVANT APPARATUS TRANSPORTING TYPEWRITERS
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Beschreibung
Zusammenfassung:	PURPOSE:To efficiently produce the titled microcapsule by emulsifying a hydrophobic liq. contg. a polyvalent isocyanate in the hydrophilic soln. of a specified polyvinyl alcohol to form a synthetic polymeric substance at the interface between the liq. droplets. CONSTITUTION:A polyvinyl alcohol having 0.5-0.8 iodine absorbance is prepared. In this case, 7ml of water is added to 1ml of 0.5% aq. soln. of the polyvinyl alcohol, 2ml of 0.001N aq. iodine soln. (in the 1/2 weight ratio of iodine to potassium iodide( is further added dropwise, the mixture is agitated for 20min to obtain a soln., and the absorbance is measured by using the soln. at 480mmu. The hydrophobic liq. contg. a polyvalent isocyanate is emulsified in the hydrophilic soln. of the polyvinyl alcohol, and a synthetic polymeric membrane is formed at the interface between the liq. droplets to produce the microcapsule covering the surface of the liq. droplet. From 0.5-20pts.wt. polyvinyl alcohol is appropriately dissolved in 100pts.wt. hydrophobic liq.