公开(公告)号：US20230406964A1

公开(公告)日：2023-12-21

申请号：US18251593

申请日：2021-10-29

Applicant: KURARAY CO., LTD.

Inventor： Misuzu FUJIMORI ,  Masaki KATO ,  Tatsuya TANIDA

IPC: C08F2/20 ,  C08F16/06 ,  C08F14/06 ,  C08F2/38

CPC classification number: C08F2/20 ,  C08F16/06 ,  C08F14/06 ,  C08F2/38

Abstract: A dispersant for suspension polymerization may, even when a usage amount thereof is low, enable obtaining polymer particles having a small average particle diameter with few coarse particles, and having favorable plasticizer absorptivity. Such a dispersant may include a vinyl alcohol polymer having a structure of following formula (1)






and satisfy inequality (2)






0.4≤[X]×102/[Ra,1]2≤3.0  (2).

In formula (1), R is a hydrocarbon group having 4 or more carbon atoms. In inequality (2), [X] is a mole percentage content of the structure of formula (1) with respect to total structural units of the vinyl alcohol polymer; and [Ra,1] is an HSP distance ((J/cm3)1/2) between the structure of formula (1) and vinyl chloride.

公开(公告)号：US20220259468A1

公开(公告)日：2022-08-18

申请号：US17625202

申请日：2020-07-06

Applicant: KURARAY CO., LTD.

Inventor： Yoriko IMAOKA ,  Tatsuya TANIDA

IPC: C09J131/04 ,  C09J11/08 ,  C09J4/06

Abstract: An aqueous emulsion may include: an ethylene-vinyl alcohol copolymer (A) as a dispersant; and a polymer (B) containing an unsaturated ethylenic monomer unit as a dispersoid, 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 aqueous emulsion may contain the ethylene-vinyl alcohol copolymer (A), as a dispersant, having a specific structure and is thus excellent in storage stability at low temperatures and water-resistant adhesiveness.

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：US20210292502A1

公开(公告)日：2021-09-23

申请号：US17260809

申请日：2019-07-17

Applicant: KURARAY CO., LTD.

Inventor： Tadahito FUKUHARA ,  Tatsuya TANIDA

IPC: C08J7/048 ,  B05D7/04 ,  C08F216/06 ,  C08J7/04

Abstract: There is provided a multilayer structure comprising a layer (A) containing 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 99.7 mol %, wherein a block character of ethylene units is 0.90 to 0.99; and a layer (B) containing at least one resin selected from the group consisting of a polyolefin resin, a polyester resin and a polyamide resin. Such a multilayer structure has excellent oxygen-gas barrier performance. In addition, an aqueous solution containing the ethylene-vinyl alcohol copolymer exhibits excellent viscosity stability even after long-term storage. Therefore, even after a long period of time from preparation of the aqueous solution, it can be uniformly applied to a substrate and thus, a multilayer structure having excellent oxygen-gas barrier performance can be provided.

公开(公告)号：US20210108111A1

公开(公告)日：2021-04-15

申请号：US17047855

申请日：2019-04-16

Applicant: KURARAY CO., LTD.

Inventor： Tatsuya TANIDA ,  Keisuke MORIKAWA ,  Masako KATAYAMA

IPC: C09J129/04 ,  C08F216/06 ,  C09J11/04

Abstract: There is provided an ethylene-vinyl alcohol copolymer with 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 99.7 mol %, wherein a block character of ethylene units in the ethylene-vinyl alcohol copolymer is 0.90 to 0.99. Such an ethylene-vinyl alcohol copolymer has excellent high-speed coating ability and water-resistant adhesiveness, particularly when being used as an adhesive.

公开(公告)号：US20200291217A1

公开(公告)日：2020-09-17

申请号：US16065551

申请日：2016-12-20

Applicant: KURARAY CO., LTD.

Inventor： Tatsuya TANIDA ,  Keisuke MORIKAWA

IPC: C08L29/04 ,  C09J129/04

Abstract: The present invention provides an aqueous emulsion excellent in heat resistance, water resistance (particularly, hot water resistance and boiling resistance), and viscosity stability. The present invention also provides an adhesive containing the aqueous emulsion, forming an adhesive layer resistant to staining, and ensuring a high level of safety. The present invention relates to an aqueous emulsion containing an ethylenically unsaturated monomer unit-containing polymer (A) as a dispersoid and vinyl alcohol polymer (B) as a dispersant, wherein, the ethylenically unsaturated monomer unit-containing polymer (A) includes a structural unit derived from a radical-polymerizable ethylenically unsaturated monomer (a) having a functional group represented by the following general formula (W), and the degree of saponification of the vinyl alcohol polymer (B) is 80 mol % or more: wherein, X is an oxygen atom or sulfur atom, and * represents a bond.

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.