Title:
懸濁重合用分散安定剤及びそれを用いたビニル系重合体の製造方法
Document Type and Number:
Japanese Patent JP7144421
Kind Code:
B2
Abstract:
The present invention provides a dispersion stabilizer for suspension polymerization that, when used for suspension polymerization of a vinyl compound, provides excellent polymerization stability, and can produce a vinyl polymer having a reduced number of coarse particles, and a reduced number of fisheyes when molded into a sheet form. The present invention also provides a method therewith. The present invention relates to a dispersion stabilizer for suspension polymerization of a vinyl compound, the dispersion stabilizer comprising a vinyl alcohol polymer (A) having a viscosity-average degree of polymerization of more than 400 and less than 1,000, a degree of saponification of more than 67 mol% and less than 78 mol%, 0.02 mol% to 1.0 mol% of a group having an ethylenic double bond in its side chain, and an absorbance (x) at 280 nm of more than 0.17 and less than 0.65 in an ultraviolet absorption spectrum of a 0.1 mass% aqueous solution.
Inventors:
Tadahito Fukuhara
Amano Yusuke
Amano Yusuke
Application Number:
JP2019535656A
Publication Date:
September 29, 2022
Filing Date:
August 06, 2018
Export Citation:
Assignee:
KURARAY CO.,LTD.
International Classes:
C08F8/12; C08F2/20; C08F2/44; C08F18/08; C08F261/04; C08F290/12
Domestic Patent References:
| JP2016079308A | ||||
| JP61108602A |
Foreign References:
| WO2015182567A1 | ||||
| WO2016076349A1 | ||||
| WO2014171502A1 | ||||
| WO2007119735A1 |
Attorney, Agent or Firm:
Koichi Kamata
Yasuaki Tamura
Yasuaki Tamura