Process for producing polyvinyl acetal resin, polyvinyl butyral resin, and process for producing esterified polyvinyl alcohol resin
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United States of America Patent
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Mar 9, 2010
Grant Date -
Dec 20, 2007
app pub date -
Aug 4, 2004
filing date -
Aug 4, 2004
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Abstract
It is an object of the present invention to provide a method of producing a polyvinyl acetal resin by which a polyvinyl acetal resin having a high acetalization degree can be produced even in a solid catalyst system, a polyvinyl butyral resin produced by the above-mentioned production method of a polyvinyl acetal resin, and a method of producing an esterified polyvinyl alcohol resin by which the esterification can be performed at high efficiency even in a solid catalyst system.The present invention is a method of producing a polyvinyl acetal resin, wherein a solution or a suspension containing a polyvinyl alcohol resin and a carbonyl compound is pressurized in the presence of a solid catalyst.
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