DISPERSION STABILIZER FOR SUSPENSION POLYMERIZATION

WIPO Patent Application WO/2010/113568

A1

Disclosed is a dispersion stabilizer for suspension polymerization, which comprises: a vinyl alcohol polymer (A) that has a saponification degree of 60 mol% or more and a viscosity average polymerization degree of 200 or more; and a polyoxyalkylene-modified vinyl alcohol polymer (B) that contains a polyoxyalkylene group represented by general formula (I) in a side chain thereof and has a viscosity average polymerization degree of 200 to 1000, a saponification degree of less than 60 mol%, and an amount of modified polyoxyalkylene groups of 0.1 to 10 mol%. When suspension polymerization is carried out using the dispersion stabilizer for suspension polymerization, it becomes possible to produce polymer particles containing little coarse particles formed therein and having uniform particle diameters. It is also possible to reduce blocking or the adhesion of scales. (In the formula, R1 represents a hydrogen atom or a methyl group: R2 represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms; and each of m and n represents the number of repeated oxyalkylene units, wherein m and n meet a requirement represented by the following formulae: 1 ≤ m ≤ 10 and 3 ≤ n ≤ 20.)

TAOKA YUTA (JP)
NII SHINSUKE (JP)
NAKAMAE MASATO (JP)

PCT/JP2010/052787

October 07, 2010

February 23, 2010

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KURARAY CO (JP)
TAOKA YUTA (JP)
NII SHINSUKE (JP)
NAKAMAE MASATO (JP)

C08F2/20; C08F290/06; C08L29/04; C09K23/52

JP2004075870A	2004-03-11
JPH111505A	1999-01-06
JPS6058402A	1985-04-04

NAKATSUKASA, SHIGEKI (JP)
Shigeki Nakamu (JP)

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