POLYVINYL ALCOHOL POWDER AND METHOD FOR PRODUCING SAME

The present invention is characterized by being a polyvinyl alcohol powder having an average particle diameter of 100 to 2000 μm as measured by optical microscopic observation at a humidity of 65% RH and a temperature of 25° C., having a bulk specific gravity (g/ml) of a portion ranging from 500 to...

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Bibliographische Detailangaben
Hauptverfasser:	TANAKA Kazuyuki, HORIGUCHI Junpei, FUNAKOSHI Junji
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G CHEMISTRY COMPOSITIONS BASED THEREON GENERAL PROCESSES OF COMPOUNDING MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP WORKING-UP
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Beschreibung
Zusammenfassung:	The present invention is characterized by being a polyvinyl alcohol powder having an average particle diameter of 100 to 2000 μm as measured by optical microscopic observation at a humidity of 65% RH and a temperature of 25° C., having a bulk specific gravity (g/ml) of a portion ranging from 500 to 1000 μm in particle diameter of more than 0.60 and less than 0.80, and having a content of the portion ranging from 500 to 1000 μm in particle diameter of 35 to 70% by mass. Accordingly, a polyvinyl alcohol powder is provided, that is good in anti-scattering property, superior in solubility in preparing an aqueous solution from the powder, and capable of reducing transport costs due to its large specific gravity.