公开(公告)号：US10604592B2

公开(公告)日：2020-03-31

申请号：US15302307

申请日：2015-04-08

Applicant: KURARAY CO., LTD.

Inventor： Tadahito Fukuhara ,  Yosuke Kumaki ,  Samuel Michel ,  Dirk Hartmann

IPC: C08F2/20 ,  C08F2/24 ,  C08F283/06 ,  C08L51/00 ,  C08F14/06 ,  C08F18/04 ,  C08F18/08 ,  C08F2/30 ,  C08F2/18 ,  C08L29/04

Abstract: Provided is a dispersion stabilizer for suspension polymerization comprising an aqueous emulsion containing a dispersant (A), a dispersoid (B), a graft polymer (C), and an aqueous medium, wherein the dispersant (A) contains a surfactant, the dispersoid (B) contains a polymer having an ethylenically unsaturated monomer unit, the graft polymer (C) is obtained by graft polymerization of the ethylenically unsaturated monomer with the dispersant (A), a mass ratio [A/(A+B+C)] is 0.001 or more and less than 0.18, a mass ratio [C/(A+B+C)] is 0 or more and less than 0.04, and the total content of the dispersant (A), the dispersoid (B), and the graft polymer (C) is 35 to 70 mass %. A vinyl polymer to be obtained by suspension polymerization of a vinyl compound using the dispersion stabilizer has good plasticizer absorption. Further, the number of fish-eyes that occur when the vinyl polymer is formed is small, and the hue deterioration is also suppressed. Further, the dispersion stabilizer also has excellent handleability.

公开(公告)号：US09751963B2

公开(公告)日：2017-09-05

申请号：US15302281

申请日：2015-04-08

Applicant: KURARAY CO., LTD. ,  KURARAY EUROPE GMBH

Inventor： Tadahito Fukuhara ,  Yosuke Kumaki ,  Samuel Michel ,  Dirk Hartmann

IPC: C08F2/20 ,  C08F114/06 ,  C08F2/18 ,  C08F14/06

CPC classification number: C08F114/06 ,  C08F2/18 ,  C08F2/20 ,  C08F14/06 ,  C08F2400/00

Abstract: A dispersion stabilizer in the present invention contains an aqueous emulsion (a) obtained by dispersing a polymer (A) having an ethylenically unsaturated monomer unit in an aqueous medium, a PVA (B) having a degree of saponification of 65 mol % or more and less than 82 mol % and a viscosity-average degree of polymerization of 250 or more and less than 1500, and a PVA (C) having a degree of saponification of 82 mol % or more and less than 98 mol % and a viscosity-average degree of polymerization of 1500 or more and less than 4000. The dispersion stabilizer contains: 7 to 51 mass % of the polymer (A); 40 to 84 mass % of the PVA (B); and 9 to 53 mass % of the PVA (C), with respect to a total amount of the polymer (A), the PVA (B), and the PVA (C). A vinyl resin satisfying required performance can be obtained using the dispersion stabilizer.