Title:
懸濁重合用分散安定剤及びビニル系樹脂の製造方法
Document Type and Number:
Japanese Patent JP6704350
Kind Code:
B2
Abstract:
A dispersion stabilizer for suspension polymerization is provided that includes a vinyl alcohol-based polymer (A), wherein a 0.1 mass% concentration aqueous solution of the polymer (A) has an absorbance (a1) of less than 0.25 at a wavelength of 280 nm, the aqueous solution has an absorbance (a2) of less than 0.030 at a wavelength of 320 nm, the polymer (A) has a degree of saponification of not less than 68 mol% and not more than 98 mol%, the polymer (A) has a viscosity-average degree of polymerization of more than 1500 and less than 4500, and the polymer (A) in powder form has a YI value of not less than 5. The dispersion stabilizer is capable of producing a vinyl-based resin that is excellent in polymerization stability, has a small particle size, and has an improved bulk density.
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Inventors:
Tadahito Fukuhara
Application Number:
JP2016559086A
Publication Date:
June 03, 2020
Filing Date:
November 11, 2015
Export Citation:
Assignee:
KURARAY CO.,LTD.
International Classes:
C08F2/20; C08F8/12; C08F14/06; C08F16/06; C09K23/52
Domestic Patent References:
| JP2002030104A | ||||
| JP8283313A | ||||
| JP10067806A | ||||
| JP5105702A | ||||
| JP59068302A | ||||
| JP9316107A | ||||
| JP2004189889A |
Attorney, Agent or Firm:
Setouchi International Patent Firm