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公开(公告)号：US20230212820A1
公开(公告)日：2023-07-06
申请号：US17565898
申请日：2021-12-30
Applicant: Kemira Oyj
Inventor： Jennifer Riser , Kirsi Terava , Timo Valkealaakso , Jaakko Hiltunen
Abstract: A method for preparation of a starch-promoted alkyl ketene dimer (AKD) sizing emulsion is provided. The inventive method comprises adding a sizing promoter comprising high-charge cationic starch and polyaluminum chloride (PAC) to a stabilized AKD emulsion and further wherein addition of said sizing promoter comprising high-charge cationic starch and PAC is effected at ambient temperature, after emulsification, stabilization, and homogenization of said stabilized AKD emulsion; and prior to addition of the starch-promoted AKD sizing emulsion to papermaking furnish, pulp, or fiber stock.
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公开(公告)号：US11339539B2
公开(公告)日：2022-05-24
申请号：US16759367
申请日：2018-10-31
Applicant: Kemira Oyj
Inventor： Timo Valkealaakso , Simo-Pekka Vanninen , Asko Karppi
Abstract: A method for manufacturing paper or board is disclosed and further disclosed is an internal sizing system for providing improved retention of hydrophobic internal sizing agents. The internal sizing system includes a hydrophobic internal sizing agent as a first component selected from a group consisting of alkenyl succinic anhydride (ASA), alkyl ketene dimer (AKD), rosin sizes and any combination thereof, and a water-soluble polymer product including amphoteric polyacrylamide as a second component, which amphoteric polyacrylamide has neutral or cationic net charge at pH 7, a weight-average molecular weight of 700,000-18,000,000 g/mol and a total ionicity of 4-28 mol-%, where the first component and the second component are provided as separate components or as a combination of the first component and the second component.
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公开(公告)号：US12031274B2
公开(公告)日：2024-07-09
申请号：US17565898
申请日：2021-12-30
Applicant: Kemira Oyj
Inventor： Jennifer Riser , Kirsi Terava , Timo Valkealaakso , Jaakko Hiltunen
Abstract: A method for preparation of a starch-promoted alkyl ketene dimer (AKD) sizing emulsion is provided. The inventive method comprises adding a sizing promoter comprising high-charge cationic starch and polyaluminum chloride (PAC) to a stabilized AKD emulsion and further wherein addition of said sizing promoter comprising high-charge cationic starch and PAC is effected at ambient temperature, after emulsification, stabilization, and homogenization of said stabilized AKD emulsion; and prior to addition of the starch-promoted AKD sizing emulsion to papermaking furnish, pulp, or fiber stock.
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4.发明申请公开(公告)号：US20200291581A1
公开(公告)日：2020-09-17
申请号：US16759367
申请日：2018-10-31
Applicant: Kemira Oyj
Inventor： Timo Valkealaakso , Simo-Pekka Vanninen , Asko Karppi
Abstract: A method for manufacturing paper or board is disclosed and further disclosed is an internal sizing system for providing improved retention of hydrophobic internal sizing agents. The internal sizing system includes a hydrophobic internal sizing agent as a first component selected from a group consisting of alkenyl succinic anhydride (ASA), alkyl ketene dimer (AKD), rosin sizes and any combination thereof, and a water-soluble polymer product including amphoteric polyacrylamide as a second component, which amphoteric polyacrylamide has neutral or cationic net charge at pH 7, a weight-average molecular weight of 700,000-18,000,000 g/mol and a total ionicity of 4-28 mol-%, where the first component and the second component are provided as separate components or as a combination of the first component and the second component.
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