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AssigneeKuraray Co., Ltd.
InventorsToshiaki Sato, Ken Yuki, Junnosuke Yamauchi, Takuji Okaya
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Disclosed herein is a new process for producing polyvinyl ester having a high degree of polymerization having an intrinsic viscosity not less than 1.5 dl/g, preferably not less than 2.2 dl/g, and most preferably higher than 3.2 dl/g, said process comprising subjecting vinyl ester monomer to low-temperature emulsion polymerization under specific conditions. Disclosed also herein is a new process for producing polyvinyl alcohol having a high degree of polymerization having an intrinsic viscosity not less than 1.5 dl/g, preferably not less than 2.2 dl/g, and most preferably higher than 3.2 dl/g, said process comprising saponifying in the usual way the polyvinyl ester obtained by low-temperature emulsion polymerization under specific conditions.
A process for producing a polyvinyl alcohol having a high degree of polymerization and an intrinsic viscosity of from 1.5 dl g.sup.-1 to 3.2 dl g.sup.-1, said process comprising:
A polyvinyl alcohol product having a high degree of polymerization and an intrinsic viscosity of from 1.5 dl g.sup.-1 to 3.2 dl g.sup.-1, said polyvinyl alcohol being obtained by a process which comprises saponifying a polyvinyl ester product obtained by subjecting a vinyl ester monomer to emulsion polymerization under conditions (a), (b), (c), and (d);
Dependencies are inferred from the claim text.