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    Treated pulp and methods of making and using same
    1.
    发明授权
    Treated pulp and methods of making and using same 有权

    公开(公告)号：US11473242B2

    公开(公告)日：2022-10-18

    申请号：US16372317

    申请日：2019-04-01

    申请人： International Paper Company

    发明人： Andre Stephan Hajnal

    IPC分类号： D21C9/00 ,  D21H21/06 ,  D21H17/06 ,  D21C9/18

    摘要： Treated pulp sheets comprising cellulose pulp fibers treated with a densifying agent and having a relatively low moisture content. In certain embodiments, the treated pulp sheets are used to produce fiberized pulp having low knot content, while maintaining density and softness properties usually associated with similarly treated pulp that is fiberized at higher moisture content. Methods of making fiberized pulp from the treated pulp sheets, as well as products comprising the treated pulp sheets or fiberized pulp from the treated pulp sheets, are also provided.

    Papermaking agent system, method for making a papermaking agent system and its use
    6.
    发明授权
    Papermaking agent system, method for making a papermaking agent system and its use 有权

    公开(公告)号：US09809930B2

    公开(公告)日：2017-11-07

    申请号：US14442433

    申请日：2013-11-13

    申请人： Kemira Oyj

    发明人： Asko Karppi ,  Matti Hietaniemi ,  Marco Polverari

    IPC分类号： D21H21/10 ,  D21H17/37 ,  D21H17/41 ,  C08L3/08 ,  D21H17/29 ,  D21H17/00 ,  D21H21/06 ,  C08B31/12 ,  D21H21/20

    CPC分类号： D21H21/10 ,  C08B31/125 ,  C08L3/08 ,  D21H17/29 ,  D21H17/375 ,  D21H17/72 ,  D21H21/06 ,  D21H21/20

    摘要： The invention relates to a papermaking agent system in liquid form, which comprises (i) cationic starch solution, prepared by cooking a starch mixture comprising a starch component and a water component, and (ii) polymer composition, which has anionic and cationic groups and a cationic net charge of >0.1 meq/g. The polymer composition comprises or originates from at least one of constituents a), b) or c). Constituent a) contains an amphoteric polymer, which is a copolymer comprising structural units derived from acrylamide and/or methacrylamide monomers, and anionic and cationic groups attached to the copolymer. Constituent b) contains a first polymer, which is a copolymer comprising structural units derived from acrylamide and/or methacrylamide monomers, and anionic or cationic groups attached to the copolymer, as well as a second polymer, which comprises groups with opposite charge than the first polymer. Constituent c) contains a third polymer, which comprises a copolymer comprising structural units derived from acrylamide and/or methacrylamide monomers, as well as hydrolytically unstable cationic groups attached to the copolymer. Constituent a), b) or c) is added to one of the components of the starch mixture or to the starch mixture before the cooking of the starch mixture, and/or constituent a) or b) is added to the cationic starch solution after cooking of the starch mixture. The invention relates also to the use of the papermaking agent system and to a method for its preparation.

    Method for dissolving cationic starch, papermaking agent and its use
    7.
    发明授权
    Method for dissolving cationic starch, papermaking agent and its use 有权
    溶解阳离子淀粉，造纸剂及其用途的方法

    公开(公告)号：US09580865B2

    公开(公告)日：2017-02-28

    申请号：US14387369

    申请日：2013-03-22

    申请人： KEMIRA OYJ

    发明人： Asko Karppi ,  Esko Tirronen

    IPC分类号： C08L79/02 ,  C08L3/00 ,  D21H17/29 ,  D21H17/45 ,  D21H17/54 ,  D21H21/10 ,  C08L3/08 ,  D21H17/37 ,  D21H17/44 ,  D21H17/55 ,  D21H17/56 ,  D21H21/06 ,  D21H21/18 ,  C08G73/02

    CPC分类号： D21H17/29 ,  C08G73/022 ,  C08G73/0286 ,  C08G73/0293 ,  C08L3/08 ,  C08L79/02 ,  D21H17/375 ,  D21H17/44 ,  D21H17/45 ,  D21H17/455 ,  D21H17/54 ,  D21H17/55 ,  D21H17/56 ,  D21H21/06 ,  D21H21/10 ,  D21H21/18

    摘要： The invention relates to a method for dissolving cationic starch. In the method is obtained an aqueous polyelectrolyte solution comprising a synthetic cationic polymer, which has a charge density value of at least 0.1 meq/g, determined at pH3, the concentration of the cationic polymer in the polyelectrolyte solution being >2.5 weight-%, and the aqueous polyelectrolyte solution is brought together with cationic starch having a degree of substitution, DS, >0.1. The cationic starch is dissolved to the polyelectrolyte solution by heating and/or mixing. The invention relates also to a papermaking agent comprising 2-40 weight-% of synthetic cationic polymer which has a charge density value of at least 0.1 meq/g, determined at p H 3, and 2.5-25 weight-% cationic starch having degree of substitution, DS, >0.1. The papermaking agent is in slurry form and has a viscosity of 50-20 000 m Pas, measured at 25° C. with Brookfield DVI+ viscometer.

    摘要翻译： 本发明涉及一种溶解阳离子淀粉的方法。 在该方法中，获得包含合成阳离子聚合物的水溶液聚电解质溶液，该聚合物的电荷密度值至少为0.1meq / g，在pH3下测定，阳离子聚合物在聚电解质溶液中的浓度> 2.5重量％ 并且将聚合电解质水溶液与具有取代度DS'> 0.1的阳离子淀粉一起使用。 通过加热和/或混合将阳离子淀粉溶解到聚电解质溶液中。 本发明还涉及一种造纸剂，其包含2-40重量％的合成阳离子聚合物，其电荷密度值至少为0.1meq / g，在p H 3和2.5-25重量％阳离子淀粉具有度 的替代，DS，> 0.1。 造纸剂为浆液形式，并且在25℃下用Brookfield DVI +粘度计测量粘度为50-20,000mPa·s。