公开(公告)号：US20210002392A1

公开(公告)日：2021-01-07

申请号：US16969745

申请日：2019-02-05

Applicant: KURARAY CO., LTD.

Inventor： Shinsuke NII

IPC: C08F8/36 ,  C08F16/06

Abstract: An object of the present invention is to provide a modified vinyl alcohol polymer having a sulfonic acid or a salt thereof, the polymer having notably improved water solubility as compared with a pre-modified vinyl alcohol polymer. A modified vinyl alcohol polymer (A) has in a side chain thereof a sulfonic acid group or a salt thereof, and in the modified vinyl alcohol polymer (A), a degree of modification with the sulfonic acid group or the salt thereof is 0.01 mol % or more and 10 mol % or less, and a block character of residual vinyl ester units is 0.55 or more and 1 or less.

公开(公告)号：US20220275191A1

公开(公告)日：2022-09-01

申请号：US17630823

申请日：2020-07-27

Applicant: KURARAY CO., LTD.

Inventor： Shinsuke NII

IPC: C08L29/04 ,  C08J3/12

Abstract: A resin powder may be superior in passability through pipes and silos, and a method may produce such a resin powder. The resin powder contains a vinyl alcohol polymer, an average particle diameter thereof is 100 to 2,000 μm, and an average value PA of a roundness P by formula (1), of 50 particles arbitrarily extracted from the particles of the resin powder having a particle diameter of 100 to 1,000 μm, is 0.1 to 0.8. P=(Σi=1Nri)/NR  (1) ri being a radius of curvature of each particle corner of the 50 particles; R being a maximum inscribed circle radius of the particle; and N being a number of particle corners. If the number of particle corners is 9 or more, the radii of curvature of eight corners, in increasing order from a smallest radius of curvature, are adopted, and N is 8.

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.