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Title:
METHOD OF PRODUCING MODIFIED VINYL ALCOHOL POLYMER
Document Type and Number:
WIPO Patent Application WO/2018/225796
Kind Code:
A1
Abstract:
Provided is a production method enabling high-efficiency production of a modified vinyl alcohol polymer that is advantageous as a dispersion stabilizer suitable for obtaining resin particles that are fine and highly homogeneous, have high plasticizer absorbency, and have suitable bulk specific gravity when suspension-polymerizing a vinyl compound such as vinyl chloride. This method of producing a formyl-group-terminated modified vinyl alcohol polymer comprises: (1) a step for obtaining a vinyl ester polymer by suspension-polymerizing a vinyl ester monomer in an aqueous medium in the presence of one or more types of halogenated methane represented by general formulas (I) to (III): (I) H2CX2 (II) HCX3 (III)CX4; (2) a step for dissolving the vinyl ester polymer obtained in step (1) in an alcohol-based medium; and (3) a step for adding an alkali to the alcohol-based medium solution of vinyl ester polymer obtained in step (2) to effect a saponification reaction.

Inventors:
WATANABE,Wataru (Omi Plant2209,Oaza Omi,Itoigawa-cit, Niigata 93, 〒9490393, JP)
Application Number:
JP2018/021758
Publication Date:
December 13, 2018
Filing Date:
June 06, 2018
Export Citation:
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Assignee:
DENKA COMPANY LIMITED (1-1Nihonbashi-Muromachi 2-Chome, Chuo-ku Tokyo, 38, 〒1038338, JP)
International Classes:
C08F8/12; C08F2/38; C08F18/04
Domestic Patent References:
WO2015119144A12015-08-13
Foreign References:
JPS51115587A1976-10-12
JPH08208724A1996-08-13
JPH05105702A1993-04-27
Attorney, Agent or Firm:
AXIS PATENT INTERNATIONAL (Shimbashi i-mark Bldg, 6-2 Shimbashi 2-ChomeMinato-k, Tokyo 04, 〒1050004, JP)
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