公开(公告)号：US20220259467A1

公开(公告)日：2022-08-18

申请号：US17625255

申请日：2020-07-06

Applicant: KURARAY CO., LTD.

Inventor： Yuta TAOKA ,  Yoriko IMAOKA ,  Tatsuya TANIDA ,  Masato NAKAMAE

IPC: C09J129/02 ,  C09J11/04 ,  A47G21/18

Abstract: A water-based adhesive for a paper straw, comprising: an ethylene-vinyl alcohol copolymer (A); and water, wherein the ethylene-vinyl alcohol copolymer (A) has a content of ethylene units of 1 mol % or more and less than 20 mol % and a block character of the ethylene units from 0.90 to 0.99. The water-based adhesive contains the ethylene-vinyl alcohol copolymer (A) having a specific structure, and is thus excellent in balance between the rapid coatability, the film strength, the initial adhesiveness, the dynamic water resistance, and the acid resistance, and particularly excellent in the rapid coatability, the film strength, and the acid resistance.

公开(公告)号：US20210261704A1

公开(公告)日：2021-08-26

申请号：US17256843

申请日：2019-07-04

Applicant: KURARAY CO., LTD.

Inventor： Tadahito FUKUHARA ,  Yoko NAKANO ,  Masato NAKAMAE

IPC: C08F216/06

Abstract: The present invention provides a modified vinyl alcohol polymer having a side chain with an ethylenic double bond, and having reduced a water-insoluble content and superior storage stability in the form of an aqueous solution. The present invention also provides a method for producing such a modified vinyl alcohol polymer. A dispersion stabilizer for suspension polymerization comprising the modified vinyl alcohol polymer is also provided that provides superior polymerization stability during suspension polymerization of a vinyl compound, and with which reduced formation of coarse particles, high bulk specific gravity, and superior plasticizer absorbability can be achieved, in addition to reducing fisheyes. The present invention also provides a method for producing a vinyl polymer. The present invention relates to a modified vinyl alcohol polymer (A) having a degree of saponification of 68 mol % or more and less than 99.9 mol %, and a viscosity-average degree of polymerization of 200 or more and less than 3,000, and comprising a side chain with 0.01 mol % or more and less than 0.50 mol % of a double bond derived from an esterification agent, the esterification agent being one or more selected from the group consisting of (i) itaconic acid and/or derivatives thereof, and (ii) methacrylic acid and/or derivatives thereof, and the modified vinyl alcohol polymer (A) having a peak width W0.05h of at least 2.85 minutes and less than 3.70 minutes at a height of 5% from the baseline in a peak measured by HPLC.

公开(公告)号：US20200299435A1

公开(公告)日：2020-09-24

申请号：US16756243

申请日：2018-10-16

Applicant: KURARAY CO., LTD

Inventor： Tatsuya TANIDA ,  Keisuke MORIKAWA ,  Masato NAKAMAE ,  Seisuke INADA

IPC: C08F216/06 ,  C09D129/04

Abstract: The present invention relates to ethylene-vinyl alcohol copolymer particles, comprising an ethylene-vinyl alcohol copolymer having an ethylene unit content of 1 mol % or more and less than 20 mol %, a viscosity-average polymerization degree of 200 to 5000, and a saponification degree of 80 to 99.99 mol %, wherein a crystallinity in water Cw (30° C.) at 30° C. and a crystallinity in water Cw (70° C.) at 70° C. as determined by pulse NMR satisfy formula (I). There is thus provided ethylene-vinyl alcohol copolymer particles having excellent solubility in water and excellent gas barrier performance.

公开(公告)号：US20170369601A1

公开(公告)日：2017-12-28

申请号：US15537996

申请日：2015-12-24

Applicant: KURARAY CO., LTD. ,  KURARAY ASIA PACIFIC PTE. LTD.

Inventor： Hideki MAKI ,  Masato NAKAMAE

IPC: C08F2/20 ,  C09J157/00 ,  C09J133/04 ,  C09J131/02 ,  C09J125/04 ,  C09J109/00 ,  C09J11/08 ,  C08L101/02 ,  C08L29/04 ,  C09J175/04 ,  C08F2/24

CPC classification number: C08F2/20 ,  C08F2/24 ,  C08F8/12 ,  C08F261/04 ,  C08G18/2835 ,  C08G18/6212 ,  C08G18/706 ,  C08G18/7671 ,  C08G2170/80 ,  C08L29/04 ,  C08L101/02 ,  C09J11/08 ,  C09J109/00 ,  C09J125/04 ,  C09J131/02 ,  C09J133/04 ,  C09J151/003 ,  C09J157/00 ,  C09J175/04 ,  C08F216/06 ,  C08F218/08 ,  C08F2/30

Abstract: The present invention relates to an aqueous emulsion including an ethylenically unsaturated monomer unit-containing polymer as a dispersoid and a polyvinyl alcohol as a dispersant. The content of a free polyvinyl alcohol in the aqueous emulsion is 0.2 to 20 parts by mass relative to 100 parts by mass of the ethylenically unsaturated monomer unit-containing polymer. The free polyvinyl alcohol has a degree of saponification of 80.0 to 99.5 mol % and a viscosity-average degree of polymerization of 200 to 5000, and the free polyvinyl alcohol has a symmetry factor (W0.05h/2f) that satisfies the following expression (1) as determined by gradient high-performance liquid chromatography for reversed-phase separation using a water-acetone eluent according to JIS K 0124 (2011). 0.85≦W0.05h/2f≦1.30  (1) (The definitions of the symbols are omitted.)