METHOD OF PRODUCING MODIFIED VINYL ALCOHOL POLYMER

专利名称：METHOD OF PRODUCING MODIFIED VINYL

ALCOHOL POLYMER

发明人：渡辺 亘

申请号：JP20181444申请日：20180606公开号：JP91403B1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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