公开(公告)号：US20240218097A1

公开(公告)日：2024-07-04

申请号：US18557186

申请日：2022-04-25

Applicant: Kuraray Co., Ltd.

Inventor： Misuzu FUJIMORI ,  Yuta TAOKA

IPC: C08F16/06 ,  C08F8/12 ,  C08J3/12 ,  D21H17/36 ,  D21H19/12 ,  D21H21/16

CPC classification number: C08F16/06 ,  C08F8/12 ,  C08J3/12 ,  D21H17/36 ,  D21H19/12 ,  D21H21/16 ,  C08J2329/04

Abstract: A vinyl alcohol polymer including a structural unit derived from at least one selected from the group consisting of: a monomer having a carboxy group; and a derivative of the monomer, wherein the vinyl alcohol polymer has: a minimum degree of branching of 0.93 or less within a range of an absolute molecular weight being 200,000 or more and 800,000 or less; a viscosity-average degree of polymerization of 750 or less; and a degree of saponification of 65 mol % or more.

公开(公告)号：US20240409794A1

公开(公告)日：2024-12-12

申请号：US18696977

申请日：2022-09-30

Applicant: Kuraray Co., Ltd.

Inventor： Yuta TAOKA ,  Misuzu FUJIMORI

IPC: C09J129/04 ,  C09J11/06

Abstract: Provided is a creping adhesive that is favorable in a thread-forming property, wet adhesiveness, and the like. A creping adhesive contains a PVA (A), wherein at least one of (i) and (ii) below is satisfied. (i) The PVA (A) includes a PVA having a minimum degree of branching of 0.25 or more and 0.93 or less within a range of an absolute molecular weight being 200,000 or more and 800,000 or less, and a ratio Mw/Mn of a weight-average molecular weight Mw to a number-average molecular weight Mn of the PVA (A) is 2.5 or more. (ii) The ratio Mw/Mn of the weight-average molecular weight Mw to the number-average molecular weight Mn of the PVA (A) is 3.8 or more.

公开(公告)号：US20240209128A1

公开(公告)日：2024-06-27

申请号：US18288570

申请日：2022-04-25

Applicant: Kuraray Co., Ltd.

Inventor： Misuzu FUJIMORI ,  Yuta TAOKA ,  Atsushi JIKIHARA

IPC: C08F18/08 ,  C08J3/12 ,  C08L31/04 ,  C09D131/04 ,  C09J131/04 ,  D21H19/12 ,  D21J1/08

CPC classification number: C08F18/08 ,  C08J3/12 ,  C08L31/04 ,  C09D131/04 ,  C09J131/04 ,  D21H19/12 ,  D21J1/08 ,  C08J2331/04 ,  C08L2201/52

Abstract: A vinyl alcohol polymer including a structural unit derived from at least one selected from the group consisting of: a monomer having a carboxy group; and a derivative of the monomer, wherein the vinyl alcohol polymer has a minimum degree of branching of 0.93 or less within a range of an absolute molecular weight being 200,000 or more and 800,000 or less, and an insoluble content of a mixture prepared by adding 4 parts by mass of the vinyl alcohol polymer to 96 parts by mass of water followed by stirring at 60° C. for 1 hour is 0.1 ppm or more and less than 2,000 ppm.

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.