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    APPLICATION OF PERFORMIC ACID (PFA) FOR MINERAL PROCESSING
    1.
    发明申请
    APPLICATION OF PERFORMIC ACID (PFA) FOR MINERAL PROCESSING 有权

    公开(公告)号：US20240409419A1

    公开(公告)日：2024-12-12

    申请号：US18700743

    申请日：2022-10-13

    Applicant: KEMIRA OYJ

    Inventor： Forrest STRICKLAND ,  Iris PORAT ,  Miguel PELAEZ ,  Chris HILL

    IPC: C01B33/40

    Abstract: A method for oxidative brightening and whitening of a mined mineral is provided. The mined mineral to be brightened may be discolored kaolin clay, such as gray clay. The inventive method comprises adding to an aqueous slurry of a mined mineral to be brightened an oxidizing solution comprising a peroxyacid, such as performic acid and recovering bleached mineral of improved brightness, color and/or improved purity compared to the mineral to be brightened.

    Coating structure, sheet-like product and its use
    2.
    发明授权
    Coating structure, sheet-like product and its use 有权

    公开(公告)号：US12163289B2

    公开(公告)日：2024-12-10

    申请号：US17059483

    申请日：2019-06-19

    Applicant: Kemira Oyj

    Inventor： Tarja Turkki ,  Sami Puttonen ,  Helena Peuranen ,  Mari Ojanen ,  Erland Hermansson ,  Anneli Lepo

    IPC: D21H19/82 ,  B65D65/42 ,  D21H19/38 ,  D21H19/54 ,  D21H19/58 ,  D21H19/60 ,  D21H27/10

    Abstract: A coating structure for a sheet-like substrate is disclosed including cellulosic fibres and a sheet-like product. The structure includes at least one pre-coat layer and a top coat layer, where the pre-coat layer(s) and the top coat layer include 10-90 weight-% of a styrene (meth)acrylate copolymer which is polymerised in the presence of a stabiliser, and which has a glass transition temperature Tg≤20° C., preferably ≤15° C., more preferably ≤13° C. Furthermore, the pre-coat layer(s) includes a polysaccharide, such as starch, and the top coat layer includes 5-60 weight-% of at least one water-soluble coating binder, which is selected from polysaccharides and polyvinyl alcohols, as well as at most 5.0 weight-% of a cross-linker, which reacts with —OH or —COOH groups.

    USE OF A CATIONIC COPOLYMER IN A MANUFACTURE OF PAPER, BOARD, TISSUE OR THE LIKE
    3.
    发明申请
    USE OF A CATIONIC COPOLYMER IN A MANUFACTURE OF PAPER, BOARD, TISSUE OR THE LIKE 有权

    公开(公告)号：US20240384471A1

    公开(公告)日：2024-11-21

    申请号：US18696758

    申请日：2022-09-28

    Applicant: KEMIRA OYJ

    Inventor： Jonni AHLGREN ,  Markus KORHONEN

    IPC: D21H17/37 ,  D21H17/45 ,  D21H21/06

    Abstract: The invention relates to a use of a cationic copolymer obtained by polymerisation of (meth)acrylamide and cationic monomers, having a standard viscosity of ≥2 mPas and a charge density at most 5 meq/g, for reducing anionic substances and/or 5 anionic particulate material in an aqueous phase of a thick fibre stock having a consistency of ≥20 g/l in a manufacture of a fibre web, such as paper, board, tissue or the like. The invention relates also to a method in a manufacture of a fibre web, such as paper, board, tissue or the like using such cationic copolymer.

    Method for estimating the vapor phase corrosion load
    4.
    发明授权
    Method for estimating the vapor phase corrosion load 有权

    公开(公告)号：US12072279B2

    公开(公告)日：2024-08-27

    申请号：US17297309

    申请日：2019-11-27

    Applicant: Kemira Oyj

    Inventor： Marko Kolari ,  Iiris Joensuu

    IPC: G01N17/04 ,  G01N33/34

    CPC classification number: G01N17/04 ,  G01N33/343

    Abstract: A method to determine vapor phase corrosion load in paper and board manufacturing system is disclosed. The method allows optimizing oxidative biocide content in aqueous solutions, suspensions and slurries in the paper and board manufacturing system. The method is based on determination of redox values (rH) of the system during determined time period. A correlation between rH values exceeding a predetermined rH threshold values and corrosion load provides an estimate of increased or decreased corrosion load and allows timely changes to biocide dosage.

    COMPOSITIONS AND METHODS FOR INCREASED WET AND DRY STRENGTH
    10.
    发明申请
    COMPOSITIONS AND METHODS FOR INCREASED WET AND DRY STRENGTH 有权

    公开(公告)号：US20230140638A1

    公开(公告)日：2023-05-04

    申请号：US17910401

    申请日：2021-03-17

    Applicant: KEMIRA OYJ

    Inventor： Chen LU

    IPC: D21H17/45 ,  C08F220/56 ,  D21H21/20 ,  D21H11/14 ,  D21H27/00 ,  D21H23/04

    Abstract: The present disclosure generally relates to glyoxalated polyacrylamide (GPAM) products, compositions comprising GPAM products, and methods of use thereof, particularly in the paper industry. Moreover, the present disclosure generally pertains to cationic GPAM products, compositions comprising, and use thereof in papermaking applications and in products such as paper-based products, wherein the cationic GPAM products may provide increased wet and/or dry strength to the paper-based product and wherein such GPAMs optionally can be stored and transported to a papermaking site without the addition of large volumes of aqueous carriers.

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