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    Release-paper base paper and method for producing same, and release paper
    1.
    发明授权
    Release-paper base paper and method for producing same, and release paper 有权

    公开(公告)号：US11643781B2

    公开(公告)日：2023-05-09

    申请号：US16498879

    申请日：2018-03-29

    Applicant: KURARAY CO., LTD.

    Inventor： Keisuke Morikawa ,  Taeko Kaharu ,  Tadahito Fukuhara ,  Yuki Tachibana

    IPC: D21H19/12 ,  C08F8/02 ,  C08F16/06 ,  D21H19/32 ,  D21H27/00

    CPC classification number: D21H19/12 ,  C08F8/02 ,  C08F16/06 ,  D21H19/32 ,  D21H27/001

    Abstract: Release paper base paper includes a substrate; and a coating agent containing a modified polyvinyl alcohol (A) and sodium acetate, the substrate coated with the coating agent, wherein the modified polyvinyl alcohol (A) has 0.005 mol % or more and less than 10 mol % of double bonds derived from unsaturated carboxylic acid or a derivative thereof (B) in side chains, has 1.4 mol % or more and 2.0 mol % or less of 1,2-glycol bond, units, and is water soluble, and a content of the sodium acetate relative to the modified polyvinyl alcohol (A) is 0.01 mass % or more and 10 mass % or less. The release paper base paper of the present invention is excellent in sealing properties for silicone. Use of the release paper base paper allows acceleration of curing of silicone in a release layer and improvement in adhesion between the substrate and the release layer.

    Spreading agent for agrochemicals, and agrochemical spray solution
    2.
    发明授权
    Spreading agent for agrochemicals, and agrochemical spray solution 有权

    公开(公告)号：US11641853B2

    公开(公告)日：2023-05-09

    申请号：US16641002

    申请日：2018-08-24

    Applicant: KURARAY CO., LTD.

    Inventor： Keisuke Morikawa ,  Taeko Kaharu

    IPC: A01N25/24 ,  C08F216/06 ,  C08F16/06 ,  C08L23/08

    CPC classification number: A01N25/24 ,  C08F16/06 ,  C08F216/06 ,  C08L23/0846 ,  C08F2800/10

    Abstract: The present invention provides a spreading agent for agrochemicals having excellent spreadability particularly against surfaces of plant leaves. The present invention also provides an agrochemical spray solution comprising the spreading agent for agrochemicals, and that shows excellent storage stability (particularly viscosity stability) even during long storage. The present invention relates to a spreading agent for agrochemicals that comprises an ethylene-modified vinyl alcohol polymer (A) having an ethylene unit content of 1.0 mol % to 19 mol %, a 1,2-glycol linkage unit content of 1.2 mol % to 2.0 mol %, a viscosity-average degree of polymerization of 200 to 5,000, and a degree of saponification of 80 mol % to 99.9 mol %.

    Polyvinyl alcohol composition and use thereof
    7.
    发明授权
    Polyvinyl alcohol composition and use thereof 有权

    公开(公告)号：US11208550B2

    公开(公告)日：2021-12-28

    申请号：US16473773

    申请日：2017-12-27

    Applicant: KURARAY CO., LTD.

    Inventor： Tadahito Fukuhara ,  Keisuke Morikawa ,  Taeko Kaharu

    IPC: C08L29/04 ,  C08F2/20 ,  C08F2/44 ,  C08F216/06 ,  C08K5/053 ,  D21H19/60 ,  D21H27/00

    Abstract: There is provided a composition (C) comprising a modified PVA (A) and a compound (B), wherein the modified PVA (A) contains 0.01 mol % or more and less than 2 mol % of double bonds derived from an unsaturated carboxylic acid or a derivative thereof in side chains; the compound (B) is a compound having a conjugated double bond and two or more hydroxy groups bonded to the conjugated double bond, or a salt or oxide thereof; and a content of the compound (B) in the composition (C) is 0.001 parts by mass or more and less than 5 parts by mass based on 100 parts by mass of the modified PVA (A). The composition (C) has excellent hue, contains less insolubles in water, and has excellent water solubility.

    Aqueous emulsion and adhesive using same
    9.
    发明授权
    Aqueous emulsion and adhesive using same 有权

    公开(公告)号：US11001703B2

    公开(公告)日：2021-05-11

    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.

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