专利名称：METHOD OF PRODUCING MODIFIED VINYL
ALCOHOL POLYMER
发明人：渡辺 亘
申请号：JP2018541444申请日：20180606公开号：JP6491403B1公开日：20190327
摘要：Provided is a production method enabling high-efficiency production of amodified vinyl alcohol polymer that is advantageous as a dispersion stabilizer suitable forobtaining resin particles that are fine and highly homogeneous, have high plasticizerabsorbency, and have suitable bulk specific gravity when suspension-polymerizing a vinylcompound such as vinyl chloride. This method of producing a formyl-group-terminatedmodified vinyl alcohol polymer comprises: (1) a step for obtaining a vinyl ester polymerby suspension-polymerizing a vinyl ester monomer in an aqueous medium in thepresence of one or more types of halogenated methane represented by general
formulas (I) to (III): (I) HCX (II) HCX (III)CX; (2) a step for dissolving the vinyl ester polymerobtained in step (1) in an alcohol-based medium; and (3) a step for adding an alkali to thealcohol-based medium solution of vinyl ester polymer obtained in step (2) to effect asaponification reaction.
申请人：デンカ株式会社
地址：東京都中央区日本橋室町二丁目１番１号
国籍：JP
代理人：アクシス国際特許業務法人
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