Title:
MODIFIED VINYL ALCOHOL POLYMER, METHOD FOR PRODUCING SAME, DISPERSION STABILIZER FOR SUSPENSION POLYMERIZATION, AND METHOD FOR PRODUCING VINYL POLYMER
Document Type and Number:
WIPO Patent Application WO/2020/009178
Kind Code:
A1
Abstract:
The present invention provides: a modified vinyl alcohol polymer having an ethylenic double bond in a side chain, reduced water-insoluble matter, and exceptional storage stability of an aqueous solution; a method for producing the modified vinyl alcohol polymer; a dispersion stabilizer for suspension polymerization containing the modified vinyl alcohol polymer, the dispersion stabilizer having exceptional polymerization stability during suspension polymerization of a vinyl compound, little formation of coarse particles, high bulk specific gravity, and exceptional plasticizer absorptivity, and being capable of reducing fish eyes; and a method for producing a vinyl polymer. The present invention pertains to a modified vinyl alcohol polymer (A) having a degree of saponification of at least 68 mol% to less than 99.9 mol%, a viscosity-average degree of polymerization of at least 200 to less than 3000, and at least 0.01 mol% to less than 0.50 mol% of double bonds derived from an esterification agent in a side chain, the modified vinyl alcohol polymer (A) being such that: the esterification agent is one or more selected from the group consisting of (i) itaconic acid and/or derivatives thereof, and (ii) methacrylic acid and/or derivatives thereof; and the peak width W0.05h at a height of 5% from the baseline in a peak measured by HPLC is at least 2.85 min to less than 3.70 min.
Inventors:
FUKUHARA TADAHITO (JP)
NAKANO YOKO (JP)
NAKAMAE MASATO (JP)
NAKANO YOKO (JP)
NAKAMAE MASATO (JP)
Application Number:
PCT/JP2019/026597
Publication Date:
January 09, 2020
Filing Date:
July 04, 2019
Export Citation:
Assignee:
KURARAY CO (JP)
International Classes:
C08F8/14; C08F2/20; C08F216/06; C09K23/52
Domestic Patent References:
| WO2019031461A1 | 2019-02-14 | |||
| WO2007119735A1 | 2007-10-25 | |||
| WO2007023762A1 | 2007-03-01 | |||
| WO2015182567A1 | 2015-12-03 | |||
| WO2007119735A1 | 2007-10-25 |
Foreign References:
| JPS6013803A | 1985-01-24 | |||
| JP2000239317A | 2000-09-05 |
Other References:
See also references of EP 3819316A4
Attorney, Agent or Firm:
KAMADA Koichi et al. (JP)
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