POLYVINYL ALCOHOL RESIN, DISPERSANT FOR SUSPENSION POLYMERIZATION, METHOD FOR PRODUCING VINYL POLYMER PARTICLES, AND METHOD FOR PRODUCING POLYVINYL ALCOHOL RESIN
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United States of America
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Nov 21, 2024
app pub date -
Jul 26, 2022
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Jul 26, 2022
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Abstract
A polyvinyl alcohol resin containing a polyvinyl alcohol as a substantially sole polymer component, wherein the polyvinyl alcohol resin has: an absorbance Abs320 at an optical path length of 10 mm and a wavelength of 320 nm being 0.09 or more, when prepared into a 0.1% by mass aqueous solution; a ratio (Abs320/Abs370) of the absorbance Abs320 to an absorbance Abs370 at an optical path length of 10 mm and a wavelength of 370 nm being 4.9 or less, when prepared into the 0.1% by mass aqueous solution; and a total content of divalent metal elements and trivalent metal elements being less than 30 μmol/g.
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