公开(公告)号：US20230212339A1

公开(公告)日：2023-07-06

申请号：US17928011

申请日：2021-05-24

Applicant: KURARAY CO., LTD.

Inventor： Ghebrehiwet Ghebremeskel ,  Keisuke Morikawa ,  Takuma Kaneshima

IPC: C08F216/06 ,  C08K11/00

CPC classification number: C08F216/06 ,  C08K11/00

Abstract: A vinyl alcohol copolymer, wherein the vinyl alcohol copolymer includes a vinyl alcohol unit and a constituent unit derived from an unsaturated monomer (A), the unsaturated monomer (A) is at least one selected from the group consisting of an unsaturated carboxylic acid, a salt thereof, an anhydride thereof, and an alkyl ester thereof, a content of the constituent unit derived from the unsaturated monomer (A) with respect to total constituent units of the vinyl alcohol copolymer is 1.00 mol % or more and 5.00 mol % or less, and 70 mol % or more of the constituent unit derived from the unsaturated monomer (A) forms a lactone ring structure.

公开(公告)号：US20220331849A1

公开(公告)日：2022-10-20

申请号：US17718176

申请日：2022-04-11

Applicant: KURARAY CO., LTD.

Inventor： Keisuke Morikawa ,  Pablo Garcia ,  Levi Neufeld

IPC: B09C1/08 ,  C09K17/52 ,  D21H19/60 ,  D21H19/40 ,  A01M13/00

Abstract: The present disclosure relates to a barrier paper comprising a paper coated with polyvinyl alcohol composition, and a method for reducing diffusion of soil fumigant using the same.

公开(公告)号：US11384276B2

公开(公告)日：2022-07-12

申请号：US17183407

申请日：2021-02-24

Applicant: KURARAY CO., LTD.

Inventor： Ghebrehiwet Ghebremeskel ,  Keisuke Morikawa ,  Takuma Kaneshima

IPC: C09K8/508 ,  C08F216/06 ,  C08F210/02 ,  E21B33/13 ,  C09K8/504

Abstract: A particulate compacted copolymer polyvinyl alcohol-based composition that can be used as a plugging agent for minimizing or eliminating loss of circulation of fluids during the process of well drilling, workover, completion and cementing in the production of oil and gas.

公开(公告)号：US11352751B2

公开(公告)日：2022-06-07

申请号：US16498507

申请日：2018-03-29

Applicant: KURARAY CO., LTD.

Inventor： Keisuke Morikawa ,  Taeko Kaharu

IPC: D21H27/00 ,  C09D129/04 ,  D21H19/12 ,  D21H19/32 ,  D21H19/82 ,  D21H21/16 ,  C08K5/092

Abstract: Release paper base paper, includes: a substrate; and a coating agent containing a polyvinyl alcohol (A) and a compound (B), the substrate coated with the coating agent, wherein the compound (B) is unsaturated carboxylic acid or a derivative thereof having a pKa of less than 4.00, and 0.1 part by mass or more and 20 parts by mass or less of the compound (B) is contained based on 100 parts by mass of the polyvinyl alcohol (A). The release paper base paper of the present invention is excellent in sealing properties for silicone and waterproofness. The release paper base paper of the present invention is also capable of accelerating curing of silicone in a release layer.

公开(公告)号：US09758601B2

公开(公告)日：2017-09-12

申请号：US15108155

申请日：2014-12-25

Applicant: KURARAY CO., LTD.

Inventor： Masaki Kato ,  Keishi Hachiya ,  Tatsuya Tanida ,  Keisuke Morikawa ,  Yusuke Amano

IPC: C08F8/12 ,  C08F116/06 ,  C08F216/06

CPC classification number: C08F8/12 ,  C08F116/06 ,  C08F216/06 ,  C08F2800/10 ,  C08F218/08 ,  C08F218/12 ,  C08F216/04 ,  C08F216/08

Abstract: Provided is a modified polyvinyl alcohol containing 0.1 to 10 mol % of a monomer unit represented by formula (1) below and having a degree of polymerization exceeding 2000. This provides a modified polyvinyl alcohol an aqueous solution of which foams less and which has excellent film strength and gas barrier properties under high humidity conditions, while having excellent water solubility. [In formula (1), R1 represents a hydrogen atom or a methyl group.]

公开(公告)号：US09663592B2

公开(公告)日：2017-05-30

申请号：US14419338

申请日：2013-08-07

Applicant: KURARAY CO., LTD.

Inventor： Makoto Okamoto ,  Keisuke Morikawa

IPC: C08F16/06 ,  B32B7/12 ,  B32B27/08 ,  B32B27/30 ,  B32B27/32 ,  B32B27/36 ,  B32B1/02 ,  C08F22/10 ,  C08L29/06 ,  C08F216/06 ,  C08F8/12

CPC classification number: C08F16/06 ,  B32B1/02 ,  B32B7/12 ,  B32B27/08 ,  B32B27/306 ,  B32B27/32 ,  B32B27/36 ,  B32B2307/7242 ,  B32B2307/7244 ,  B32B2307/736 ,  B32B2439/00 ,  B32B2439/40 ,  B32B2439/70 ,  C08F8/12 ,  C08F22/10 ,  C08F216/06 ,  C08L29/06 ,  Y10T428/1352 ,  Y10T428/1397 ,  Y10T428/31515 ,  Y10T428/31913 ,  Y10T428/31938 ,  C08F210/02 ,  C08F216/08 ,  C08F216/16 ,  C08F218/08 ,  C08F216/1416

Abstract: Provided is a modified ethylene-vinyl alcohol copolymer, wherein the copolymer is represented by a following formula (I), contents (mol %) of a, b, and c based on the total monomer units satisfy following formulae (1) through (3), and a degree of saponification (DS) defined by a following formula (4) is not less than 90 mol %, 18≦a≦55  (1) 0.01≦c≦20  (2) [100−(a+c)]×0.9≦b≦[100−(a+c)]  (3) DS=[(Total Number of Moles of Hydrogen Atoms in X, Y, and Z)/(Total Number of Moles of X, Y, and Z)]×100  (4).