POLYVINYL ALCOHOL RESIN, POLYVINYL ACETAL RESIN, METHOD FOR PRODUCING POLYVINYL ALCOHOL RESIN, AND METHOD FOR PRODUCING POLYVINYL ACETAL RESIN
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United States of America Patent
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Aug 22, 2024
app pub date -
Jun 20, 2022
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Jun 24, 2021
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Abstract
The present invention provides an ultra-high molecular weight polyvinyl alcohol resin that can provide, when acetalized, a resin film having high strength and high transparency. The present invention also provides a polyvinyl acetal resin, a method for producing a polyvinyl alcohol resin, and a method for producing a polyvinyl acetal resin. Provided is a polyvinyl alcohol resin having at least one selected from the group consisting of a sulfone group, an alkyl sulfonyl group, an aromatic sulfonyl group, a sulfine group, an imidazoline group, a carboxy group, an amide group, an amino group, and a hydroxy group at at least one molecular end of a main chain, having a weight average molecular weight (Mw) of 1,000,000 or more, and containing a water-soluble surfactant in an amount of 0.02% by weight or less.
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