公开(公告)号：US20220144977A1

公开(公告)日：2022-05-12

申请号：US17438697

申请日：2020-03-12

Applicant: KURARAY CO., LTD.

Inventor： Yuki TACHIBANA ,  Yusuke AMANO ,  Yuki SHIMIZU ,  Kazuhiko MAEKAWA

IPC: C08F8/14 ,  B29B9/12 ,  C08F16/06

Abstract: A method of producing modified vinyl alcohol-based polymer particles, includes mixing vinyl alcohol-based polymer particles with a mixed medium containing unsaturated carboxylic acid, an acid catalyst, and water, wherein, by mixing the vinyl alcohol-based polymer particles with the mixed medium, the vinyl alcohol-based polymer particles are reacted with the unsaturated carboxylic acid to obtain modified vinyl alcohol-based polymer particles containing a vinyl ester unit represented by a formula (2) below, having a vinyl alcohol unit content based on the total constitutional units from 95 to 99.99 mol %, and having an average particle diameter from 50 to 2000 μm. The production method does not cause the problem of the residual sulfur content derived from a liquid medium used for reaction and is also capable of modifying the vinyl alcohol-based polymer particles while maintaining the particle shape.

公开(公告)号：US20220089793A1

公开(公告)日：2022-03-24

申请号：US17418468

申请日：2019-12-26

Applicant: KURARAY CO., LTD.

Inventor： Yuki TACHIBANA ,  Yusuke AMANO ,  Yuki SHIMIZU ,  Kazuhiko MAEKAWA

IPC: C08F16/06 ,  C08J7/16

Abstract: A method of producing modified vinyl alcohol-based polymer particles, includes mixing vinyl alcohol-based polymer particles with a mixed medium containing unsaturated carboxylic acid, an acid catalyst, and water, wherein, by mixing the vinyl alcohol-based polymer particles with the mixed medium, the vinyl alcohol-based polymer particles are reacted with the unsaturated carboxylic acid to obtain modified vinyl alcohol-based polymer particles containing a vinyl ester unit represented by a formula (2) below, having a vinyl alcohol unit content based on the total constitutional units of 60 mol % or more and less than 95 mol %, and having an average particle diameter from 50 to 2000 μm. The production method is capable of controlling the particle shape and does not cause the problem of the residual sulfur content, and is further convenient and economically advantageous.

公开(公告)号：US20150259457A1

公开(公告)日：2015-09-17

申请号：US14728279

申请日：2015-06-02

Applicant: KURARAY CO., LTD.

Inventor： Takuma KANESHIMA ,  Yusuke AMANO ,  Keisuke MORIKAWA

IPC: C08F265/04 ,  B01J41/14 ,  B01J39/20

CPC classification number: C08F265/04 ,  B01D71/38 ,  B01D71/78 ,  B01D71/82 ,  B01D2323/38 ,  B01J39/20 ,  B01J41/14 ,  B01J47/12 ,  C08F2/38 ,  C08F261/04 ,  C08F222/06

Abstract: Provided are (1) a vinyl alcohol graft copolymer grafting polymerizable unsaturated monomers as a graft chain onto a side-chain mercapto group-containing vinyl alcohol polymer backbone, the graft chain being attached to the polymer backbone at a mercapto group, and the backbone including: a vinyl alcohol unit and a unit represented by the following formula (I): wherein R1 is a hydrogen atom or a carboxyl group; R2 is a hydrogen atom, a methyl group, a carboxyl group, or a carboxymethyl group; and X is a divalent C1-22 group which contains a carbon atom and a hydrogen atom and may contain a nitrogen atom and/or an oxygen atom; and (2) an ion-exchange membrane having controlled swelling in water and excellent flex resistance, the membrane including a vinyl alcohol graft copolymer as described above.

Abstract translation: 提供（1）乙烯醇接枝共聚物将可聚合不饱和单体作为接枝链接枝到含侧链巯基的乙烯醇聚合物骨架上，接枝链以巯基连接到聚合物主链上，主链包括 乙烯醇单元和由下式（I）表示的单元：其中R1是氢原子或羧基; R2是氢原子，甲基，羧基或羧甲基; X是含有碳原子和氢原子并且可以含有氮原子和/或氧原子的二价C1-22基团; 和（2）具有在水中具有受控溶胀和优异抗弯曲性的离子交换膜，该膜包括如上所述的乙烯醇接枝共聚物。

公开(公告)号：US20220220332A1

公开(公告)日：2022-07-14

申请号：US17605849

申请日：2020-04-24

Applicant: Kuraray Co., Ltd

Inventor： Yuki TACHIBANA ,  Yusuke AMANO ,  Kazuhiko MAEKAWA

IPC: C09D129/04 ,  C08F16/06 ,  C08K3/36 ,  C08K3/34 ,  C09D7/61 ,  C09D7/65 ,  C09D5/14 ,  B65D65/42

Abstract: A coating composition may include a modified polyvinyl alcohol resin (A) having an ethylene unsaturated group in a side chain thereof. Examples of the modified polyvinyl alcohol resin (A) include those including a structural unit represented by formula (II) or (III). Substrates in various technical fields such as the resin molding field, automobile/railway/aircraft/ships-related field, medical product field, food field, agriculture/gardening field, electrical field, and construction field can be coated with such a coating composition.

公开(公告)号：US20200247915A1

公开(公告)日：2020-08-06

申请号：US16636481

申请日：2018-08-06

Applicant: KURARAY CO., LTD.

Inventor： Tadahito FUKUHARA ,  Yusuke AMANO

IPC: C08F2/20 ,  C08F2/18 ,  C08F2/44 ,  C08F8/12 ,  C08F2/38 ,  C08F214/06

Abstract: The present invention provides a dispersion stabilizer for suspension polymerization that, when used for suspension polymerization of a vinyl compound, provides excellent polymerization stability, and can produce a vinyl polymer having a reduced number of coarse particles, and a reduced number of fisheyes when molded into a sheet form. The present invention also provides a method therewith. The present invention relates to a dispersion stabilizer for suspension polymerization of a vinyl compound, the dispersion stabilizer comprising a vinyl alcohol polymer (A) having a viscosity-average degree of polymerization of more than 400 and less than 1,000, a degree of saponification of more than 67 mol % and less than 78 mol %, 0.02 mol % to 1.0 mol % of a group having an ethylenic double bond in its side chain, and an absorbance (x) at 280 nm of more than 0.17 and less than 0.65 in an ultraviolet absorption spectrum of a 0.1 mass % aqueous solution.

公开(公告)号：US20160319048A1

公开(公告)日：2016-11-03

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

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.]

Abstract translation: [式（1）中，R 1表示氢原子或甲基。]

公开(公告)号：US20240287299A1

公开(公告)日：2024-08-29

申请号：US18572207

申请日：2022-06-24

Applicant: KURARAY CO., LTD.

Inventor： Yusuke AMANO ,  Yuki TACHIBANA ,  Hirotaka SAWATANI ,  Tomohiko SATO

IPC: C08L29/04 ,  C08L3/02

CPC classification number: C08L29/04 ,  C08L3/02 ,  C08L2201/10 ,  C08L2203/12 ,  C08L2203/16 ,  C08L2203/30

Abstract: A resin composition, containing an anionic group-containing modified vinyl alcohol polymer (A) and a starch (B). The starch (B) has an amylopectin content of 50 to 100% by mass. A molded body including the resin composition, which is a film or a fiber. A molded body including the resin composition, which is a water-soluble film or a water-soluble fiber.

公开(公告)号：US20210246299A1

公开(公告)日：2021-08-12

申请号：US16972849

申请日：2019-06-07

Applicant: KURARAY CO., LTD.

Inventor： Yusuke AMANO ,  Eiichi ISHIDA ,  Kazuhiko MAEKAWA ,  Daisuke KODA ,  Hiroshi KANBARA

IPC: C08L51/04 ,  C08L51/06 ,  C08L29/04 ,  C08L23/08 ,  C08L23/22 ,  C08F236/06 ,  C08F236/08 ,  C08K3/04 ,  C08K3/36 ,  C08K5/54 ,  C08L9/06 ,  C08L7/00 ,  C08L91/00 ,  B60C1/00

Abstract: The present invention provides a rubber composition having superior moldability, wear resistance, and grip performance, and tires therewith. The present invention relates to a rubber composition comprising: a copolymer (B) constituted of a vinyl alcohol polymer (B-1) region and a diene polymer (B-2) region; and a rubber component (C), wherein the rubber composition comprises 1 to 20 parts by mass of the copolymer (B) relative to 100 parts by mass of the rubber component (C).

公开(公告)号：US20190119414A1

公开(公告)日：2019-04-25

申请号：US16089483

申请日：2017-03-30

Applicant: KURARAY CO., LTD. ,  UNIVERSITE DE LIEGE

Inventor： Takumi TAKAYAMA ,  Yusuke AMANO ,  Kazuhiko MAEKAWA ,  Christophe DETREMBLEUR ,  Antoine DEBUIGNE ,  Christine JEROME

IPC: C08F16/06 ,  C08F18/08 ,  C08F8/12 ,  B01J31/22

Abstract: A polyvinyl alcohol is produced in a method comprising: a polymerization step comprising polymerizing vinyl ester monomers by controlled radical polymerization in the presence of a radical initiator and an organic cobalt complex to obtain a polymer solution containing a polyvinyl ester; an extraction step comprising extracting a cobalt complex from the polymer solution by contacting an aqueous solution containing a water-soluble ligand with the polymer solution; and a saponification step comprising saponifying the polyvinyl ester after the extraction step to obtain a polyvinyl alcohol. A method for producing a polyvinyl alcohol is thus provided that has a narrow molecular weight distribution and a high number-average molecular weight with good hue and further good solubility in water.

公开(公告)号：US20190100607A1

公开(公告)日：2019-04-04

申请号：US16089441

申请日：2017-03-30

Applicant: KURARAY CO., LTD.

Inventor： Yusuke AMANO ,  Takumi TAKAYAMA ,  Kazuhiko MAEKAWA ,  Kazuhiko MAEKAWA

IPC: C08F16/06

Abstract: A polyvinyl alcohol has a number-average molecular weight (Mn) from 4,400 to 440,000, a molecular weight distribution (Mw/Mn) from 1.05 to 1.70, a degree of saponification from 80 to 99.99 mol %, and a carbon-carbon double bond content (X) of 0.1 mol % or less based on total monomer units, and satisfying a formula (1) below. A polyvinyl alcohol, having a narrow molecular weight distribution and a high number-average molecular weight with good hue, and a method for producing the same are thus provided. X·Mn≤1000  (1)