公开(公告)号：US20250059305A1

公开(公告)日：2025-02-20

申请号：US18720882

申请日：2022-12-22

Applicant: Kuraray Co., Ltd.

Inventor： Masahiro BABA ,  Shinnosuke AKUTAGAWA ,  Shingo UEYAMA ,  Hiroyuki KONISHI

IPC: C08F8/12 ,  C08F218/08

Abstract: A vinyl alcohol copolymer may include a vinyl alcohol constituent unit and an olefin constituent unit vinyl alcohol having 3 to 30 carbon atoms. Such a copolymer may satisfy at least one of: a difference between a melting point and a lowest heat-sealing temperature is 45° C. or more; and the lowest heat-sealing temperature is 80° C. or less. Such a copolymer may satisfy predetermined relational formulas based on intensities and the number average molecular weight obtained from a UV absorption detector and a refractive index detector in gel permeation chromatography measurement performed on the copolymer.

公开(公告)号：US20220267499A1

公开(公告)日：2022-08-25

申请号：US17623105

申请日：2020-06-25

Applicant: KURARAY CO., LTD.

Inventor： Takumi TAKAYAMA ,  Kazutoshi MISHIMA ,  Hiroyuki KONISHI ,  Kazuhiko MAEKAWA

IPC: C08F293/00 ,  C08F4/70 ,  C08L53/00

Abstract: Disclosed is a vinyl alcohol-based block copolymer that is a block copolymer composed of a vinyl alcohol-based polymer block (B-b) and a copolymer block (B-c) comprising a vinyl alcohol-based monomer unit and an acrylic acid-based monomer unit, wherein a content (Z) of the acrylic acid-based monomer unit relative to all monomer units is 0.05 to 20.0 mol %, the block copolymer has a saponification degree of 80 to 99.99 mol %, the block copolymer has a number-average molecular weight (Mna) of 20,000 to 440,000, the block copolymer has a molecular weight distribution (Mwa/Mna) of 1.05 to 1.95, and a ratio (DPb/DPa) of a number-average polymerization degree (DPb) of the vinyl alcohol-based polymer block (B-b) to the number-average polymerization degree (DPa) of the block copolymer is 0.010 to 0.999. The copolymer has a fine balance derived from the copolymer block (B-c) of having a superior solubility in water while being unlikely to undergo thickening or gelation due to pH fluctuation, and also has high mechanic strength derived from the vinyl alcohol-based polymer block (B-b).

公开(公告)号：US20170174802A1

公开(公告)日：2017-06-22

申请号：US15116144

申请日：2015-02-03

Applicant: KURARAY CO., LTD.

Inventor： Atsuhiro NAKAHARA ,  Takashi FUKUMOTO ,  Hiroyuki KONISHI

IPC: C08F220/14 ,  C08J5/18

CPC classification number: C08F220/14 ,  C08J5/18 ,  C08J2333/12 ,  C08F224/00

Abstract: A copolymer comprising structural units derived from a monomer represented by formula (1) and structural units derived from another monomer (A). (In formula (1), ring Z1 represents a C3-10 ring structure optionally having an oxygen atom at any position formed together with two carbon atoms on γ-butyrolactone. R1 represents a hydrogen atom or C1-10 alkyl group.