Title:
DISPERSION STABILIZER FOR SUSPENSION POLYMERIZATION AND METHOD FOR PRODUCING VINYL RESIN
Document Type and Number:
WIPO Patent Application WO/2016/076349
Kind Code:
A1
Abstract:
Provided is a dispersion stabilizer for suspension polymerization, which contains a vinyl alcohol polymer (A) that is configured such that: the absorbance (a1) of a 0.1% by mass aqueous solution thereof at a wavelength of 280 nm is less than 0.25; the absorbance (a2) of the aqueous solution at a wavelength of 320 nm is less than 0.030; the saponification degree thereof is from 68% by mole to 98% by mole (inclusive); the viscosity-average polymerization degree thereof is more than 1,500 but less than 4,500; and the YI value thereof in a powder form is 5 or more. This dispersion stabilizer enables the achievement of a vinyl resin that has excellent polymerization stability, small particle size and improved bulk specific gravity.
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Inventors:
FUKUHARA TADAHITO (JP)
Application Number:
PCT/JP2015/081716
Publication Date:
May 19, 2016
Filing Date:
November 11, 2015
Export Citation:
Assignee:
KURARAY CO (JP)
International Classes:
C08F2/20; C09K23/52
Foreign References:
| JPH1067806A | 1998-03-10 | |||
| JP2002030104A | 2002-01-31 | |||
| JPH05105702A | 1993-04-27 | |||
| JPS5968302A | 1984-04-18 | |||
| JPH09316107A | 1997-12-09 | |||
| JP2004189889A | 2004-07-08 |
Other References:
See also references of EP 3219735A4
Attorney, Agent or Firm:
SETOUCHI INTERNATIONAL PATENT FIRM (JP)
It is [特許業務法人せ and] an international patent firm among them. (JP)
It is [特許業務法人せ and] an international patent firm among them. (JP)
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