Title:
DISPERSION STABILIZER FOR SUSPENSION POLYMERIZATION AND METHOD FOR PRODUCING VINYL POLYMER USING SAME
Document Type and Number:
WIPO Patent Application WO/2019/031461
Kind Code:
A1
Abstract:
The present invention provides: a dispersion stabilizer for suspension polymerization that is excellent in polymerization stability when subjecting a vinyl compound to suspension polymerization, can provide a vinyl polymer with a smaller number of coarse particles and can reduce fish eyes on a sheet formed from the obtained vinyl polymer; and a method for producing the same. The present invention pertains to a dispersion stabilizer for suspension polymerization of a vinyl compound, the dispersion stabilizer comprising a vinyl alcohol polymer (A) that has a viscosity average polymerization degree of more than 400 and less than 1000, and a saponification degree of more than 67 mol% and less than 78 mol%, that includes 0.02-1.0 mol% of a group having an ethylenic double bond in a side chain, and that shows an absorbance (x) of more than 0.17 and less than 0.65 at 280 nm in a UV ray absorbing spectrum of a 0.1-mass% aqueous solution.
Inventors:
FUKUHARA TADAHITO (JP)
AMANO YUSUKE (JP)
AMANO YUSUKE (JP)
Application Number:
PCT/JP2018/029472
Publication Date:
February 14, 2019
Filing Date:
August 06, 2018
Export Citation:
Assignee:
KURARAY CO (JP)
International Classes:
C08F8/12; C08F2/38; C08F2/44
Domestic Patent References:
| WO2015182567A1 | 2015-12-03 | |||
| WO2016076349A1 | 2016-05-19 | |||
| WO2014171502A1 | 2014-10-23 | |||
| WO2007119735A1 | 2007-10-25 | |||
| WO2014171502A1 | 2014-10-23 |
Foreign References:
| JP2016079308A | 2016-05-16 | |||
| JPS61108602A | 1986-05-27 | |||
| JPS5145189A | 1976-04-17 | |||
| JP2004250695A | 2004-09-09 |
Other References:
See also references of EP 3666803A4
Attorney, Agent or Firm:
KAMADA Koichi et al. (JP)
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