Title:
POLYVINYL ALCOHOL-BASED POLYMER
Document Type and Number:
WIPO Patent Application WO/2022/024791
Kind Code:
A1
Abstract:
The present invention provides a PVA having excellent heat resistance and pressure resistance. This polyvinyl alcohol-based polymer is obtained through saponification of: a homopolymer formed of a vinylester monomer; a copolymer of a vinylester monomer and a monofunctional monomer other than a vinylester; a copolymer of a vinylester monomer and a polyfunctional monomer; or a copolymer of a vinylester monomer, and a polyfunctional monomer and a monofunctional monomer other than a vinylester. When an aqueous solution of the polyvinyl alcohol-based polymer is filtered using a 100-mesh (opening: 0.154 mm) filter, the concentration thereof is adjusted to 10.0 mass%, the storage modulus G' (20°C) in the range of an angular frequency of 1.0-10.0 rad/s is measured in the aqueous solution, and the results are plotted in logarithmic scales for both axes; the inclination in the plot is 1.2 or less.
Inventors:
YAMASHITA AKIHIRO (JP)
Application Number:
PCT/JP2021/026688
Publication Date:
February 03, 2022
Filing Date:
July 15, 2021
Export Citation:
Assignee:
DENKA COMPANY LTD (JP)
International Classes:
C08F8/12; C08F16/06; C09K8/44
Domestic Patent References:
| WO2019163490A1 | 2019-08-29 | |||
| WO2021116678A1 | 2021-06-17 | |||
| WO2007146348A2 | 2007-12-21 |
Foreign References:
| JPS55104301A | 1980-08-09 | |||
| JP2000157625A | 2000-06-13 | |||
| JP2015196733A | 2015-11-09 | |||
| JP2015196733A | 2015-11-09 |
Attorney, Agent or Firm:
AXIS PATENT INTERNATIONAL (JP)
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