公开(公告)号：US20190300693A1

公开(公告)日：2019-10-03

申请号：US16337224

申请日：2017-04-13

Applicant: KURARAY CO., LTD.

Inventor： Shinsuke NII ,  Yosuke KUMAKI ,  Junpei HORIGUCHI ,  Tadahito FUKUHARA ,  Tatsuya TANIDA

IPC: C08L29/04 ,  C08F216/06 ,  C08F222/10 ,  C08F8/12 ,  C08F8/16 ,  C08K5/00

Abstract: A modified vinyl alcohol polymer powder having a structural unit derived from a derivative of an ethylenically unsaturated dicarboxylic acid, and containing a reduced amount of methanol, and a trace amount of a component that does not dissolve in water. The present invention relates to a modified vinyl alcohol polymer powder containing a structural unit derived from a derivative (A) of an ethylenically unsaturated dicarboxylic acid in a content (X) of 0.05 mol % or more and 10 mol % or less, and having a degree of saponification of 80.0 mol % or more and 99.9 mol % or less, the modified vinyl alcohol polymer powder has a methanol content of 0.01 weight % or more and less than 3.0 weight %, the modified vinyl alcohol polymer powder contains 0.1 ppm or more and less than 2,000 ppm of a component that is insoluble in a 90° C., 5 weight % aqueous solution.

公开(公告)号：US20170190812A1

公开(公告)日：2017-07-06

申请号：US15315420

申请日：2015-06-03

Applicant: KURARAY CO., LTD.

Inventor： Junpei HORIGUCHI ,  Kazuyuki TANAKA ,  Junji FUNAKOSHI

IPC: C08F116/06 ,  C08J3/12

CPC classification number: C08F116/06 ,  B01J4/001 ,  B01J19/2415 ,  B01J19/242 ,  C08F8/12 ,  C08F16/06 ,  C08F216/06 ,  C08F218/08 ,  C08J3/12 ,  C08J2329/04 ,  C08F118/08

Abstract: The present invention is characterized by being a polyvinyl alcohol powder having an average particle diameter of 100 to 2000 μm as measured by optical microscopic observation at a humidity of 65% RH and a temperature of 25° C., having a bulk specific gravity (g/ml) of a portion ranging from 500 to 1000 μm in particle diameter of more than 0.60 and less than 0.80, and having a content of the portion ranging from 500 to 1000 μm in particle diameter of 35 to 70% by mass. Accordingly, a polyvinyl alcohol powder is provided, that is good in anti-scattering property, superior in solubility in preparing an aqueous solution from the powder, and capable of reducing transport costs due to its large specific gravity.