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EP4623147A1 - Rétention améliorée d'additifs cellulosiques modifiés à l'aide d'une combinaison synergique de polymères cationiques - Google Patents

Rétention améliorée d'additifs cellulosiques modifiés à l'aide d'une combinaison synergique de polymères cationiques

Info

Publication number
EP4623147A1
EP4623147A1 EP23904554.5A EP23904554A EP4623147A1 EP 4623147 A1 EP4623147 A1 EP 4623147A1 EP 23904554 A EP23904554 A EP 23904554A EP 4623147 A1 EP4623147 A1 EP 4623147A1
Authority
EP
European Patent Office
Prior art keywords
polymer
cationic
fixation
eca
retention
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP23904554.5A
Other languages
German (de)
English (en)
Inventor
Jennifer RISER
John Vanderkolk
Junhua Chen
Yuping Luo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kemira Oyj
Original Assignee
Kemira Oyj
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kemira Oyj filed Critical Kemira Oyj
Publication of EP4623147A1 publication Critical patent/EP4623147A1/fr
Pending legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D21H17/25—Cellulose
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D21H17/28—Starch
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/41—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups
    • D21H17/42—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups anionic
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/71—Mixtures of material ; Pulp or paper comprising several different materials not incorporated by special processes
    • D21H17/72—Mixtures of material ; Pulp or paper comprising several different materials not incorporated by special processes of organic material
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/18—Reinforcing agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/18—Reinforcing agents
    • D21H21/20—Wet strength agents

Definitions

  • ECA engineered cellulosic additives
  • CMC is more commonly used to add strength to the paper web.
  • ECA is differentiated from CMC in terms of its solubility, charge density and molecular weight (Mw). CMC is fully dissolvable in water and has a Mw range from 10k to 1MDaltons.
  • ECA exists as somewhat of a hybrid technology in the space between CMC and nanocellulose/microfibrillated cellulose (MFC).
  • ECA is lower in charge than CMC and has portions of material existing as dissolved material and other parts ranging from 200 to 300 nm in length. Being able to retain the dissolved, colloidal fraction as well as the nano ⁇ scale fraction is important to ECA’s strength performance.
  • Both ECA and CMC additives rely on cationic additives and particularly cationic polymers in order to be chemically retained in the fiber web.
  • ECAs even though they are anionically charged, are difficult to retain in the papermaking furnish, even with the addition of current cationic polymer additives used to promote the retention of ECA in the fiber web.
  • fixation polymer a high ⁇ charge low molecular weight quick inversion polymer
  • anionic ECA product anionic ECA product
  • retention polymer relatively low ⁇ charge high molecular weight quick inversion polymer
  • the term “surface sizing” generally refers to the application of a solution, often containing starch, to the surface of paper, usually in order to increase surface strength, and sometimes with addition of hydrophobic polymers or other material at the paper surface.
  • surfactant refers to a surface active agent usually comprised of molecules with water ⁇ loving and water ⁇ hating groups, used for wetting, emulsifying, etc.
  • thick stock generally refers to mixture of papermaking pulp and other materials with a consistency of about 2 to 5%.
  • the term "thin stock” generally refers to a mixture of papermaking pulp and other materials, after having been diluted with whitewater at a fan pump.
  • wet strength generally refers to the strength of a sheet of paper after it has been exposed to a standard solution for a standard length of time, but often expressed as a ratio vs. the dry strength.
  • wet end of a paper machine generally refers to the parts of a papermaking process between pulping (or bleaching) and wet ⁇ pressing of the paper.
  • the term "white water” generally refers to process water within a paper machine system, especially referring to water that is drained from paper as the sheet is being formed.
  • kg/T means kilograms per metric ton.
  • the present invention relates to a papermaking process that includes the separate addition of a high ⁇ charge low molecular weight quick inversion polymer for fixation, an anionic ECA product, and a relatively low ⁇ charge high molecular weight quick inversion polymer for retention, preferably with the addition sequence in this order.
  • the high cationic charged quick inversion fixation polymer enhances the fixation of the anionic ECA product and other anionic colloidal particles onto the anionic fibers; and that the high Mw quick inversion cationic retention polymer, which is subsequently added (after the ECA), improves the retention of the ECA, fines and other colloidal particles in the web.
  • the two cationic quick inversion polymers are used together in the same furnish with the ECA (but added separately), synergistic benefits are attained.
  • the combined use of the two cationic quick inversion polymers in conjunction with the ECA synergistically enhance total retention of ECA, as well as fines and fiber on paper machines.
  • the molecular weight of the cationic polymer is reduced to a range which is suitable to improve fixation without damaging sheet formation at elevated polymer dosage levels.
  • This high charge quick inversion fixation polymer has been demonstrated to be more efficient in fixation than traditional charge fixation/control agents (CCA) such as polyacrylamide ⁇ DADMAC dispersions, polyamines, and polyDADMAC solution polymers.
  • CCA charge fixation/control agents
  • This polymer is generally synthesized in emulsion form, i.e., by use of inverse emulsion methods as described below.
  • the temperature is desirably maintained below 50 °C, optionally using a water bath and by simultaneously cutting the SO 2 supply. Completion of polymerization is indicated when no further increase in temperature is seen even when SO 2 is continuously being fed. At this point, set the SO 2 flow rate back to the initial value and reactor temperature to 50 °C and hold for ⁇ 1.5 hours. Nitrogen is desirably continuously sparged throughout the entire process.
  • Post Additives [0115] A breaker or inverse surfactant is added to the polymerizate, optionally an ethoxylated alcohol, further optionally at an addition rate of ⁇ 2.0 wt% and the admixture is permitted to mix, optionally for ⁇ 20 minutes.
  • the cellulose derivative having a degree of substitution of carboxyalkyl groups up to about 0.65, preferably about 0.05 to 0.55.
  • the anionic cellulose derivative have a viscosity of ⁇ 2 wt% water solution greater or equal to 100 mPa.s at 25°C, preferably greater or equal to 2500 mPa.s. The viscosity is optionally measured by Brookfield LVT viscometer at 30 rpm using #62 spindle.
  • the cellulose derivative is water ⁇ soluble or at least partly water ⁇ soluble or water ⁇ dispersible, more preferably water ⁇ soluble or at least partly water ⁇ soluble.
  • the cellulose derivative is ionic.
  • sulphoalkyl, phosphate and phosphonate groups in which the alkyl group can be methyl, ethyl propyl and mixtures thereof, suitably methyl; suitably the cellulose derivative contains an anionic group comprising a carboxylate group, e.g. a carboxyalkyl group.
  • the counter ⁇ ion of the anionic group is usually an alkali metal or alkaline earth metal, preferably sodium.
  • suitable cationic groups of cellulose derivatives according to the invention include salts of amines, suitably salts of tertiary amines, and quaternary ammonium groups, preferably quaternary ammonium groups.
  • the chain of atoms is an alkylene group with from 2 to 18 and suitably 2 to 8 carbon atoms, optionally interrupted or substituted by one or more heteroatoms, e.g. O or N such as alkyleneoxy group or hydroxy propylene group.
  • Preferred cellulose derivatives containing cationic groups include those obtained by reacting cellulose or derivative thereof with a quaternization agent selected from 2, 3 ⁇ epoxypropyl trimethyl ammonium chloride, 3 ⁇ chloro ⁇ 2 ⁇ hydroxypropyl trimethyl ammonium chloride and mixtures thereof.
  • the cellulose derivatives of this invention can contain non ⁇ ionic groups such as alkyl or hydroxy alkyl groups, e.g.
  • the cellulose derivative contains both ionic groups and non ⁇ ionic groups.
  • suitable cellulose derivatives according to the invention include carboxyalkyl celluloses, e.g.
  • carboxymethyl cellulose carboxyethyl cellulose, carboxypropyl cellulose, sulphoethyl carboxymethyl cellulose, carboxymethyl hydroxyethyl cellulose (“CM ⁇ HEC”), carboxymethyl cellulose wherein the cellulose is substituted with one or more non ⁇ ionic substituents, preferably carboxymethyl cellulose (“CMC”).
  • CMC carboxymethyl cellulose
  • suitable cellulose derivatives and methods for their preparation include those disclosed in U.S. Pat. No. 4,940,785, which is hereby incorporated herein by reference.
  • the terms “degree of substitution” or “DS”, as used herein, mean the number of substituted ring sites of the beta ⁇ anhydroglucose rings of the cellulose derivative.
  • the cellulose derivative has a degree of substitution of carboxyalkyl groups (“DSCA”) up to about 0.65, i.e. the cellulose derivative has an average degree of carboxyalkyl substitution per glucose unit up to about 0.65.
  • the carboxyalkyl groups are suitably carboxymethyl groups and then DSCA referred to herein is the same as the degree of substitution of carboxymethyl groups (“DSCM”).
  • DSNI, DSNA, DSNC, and DSCA independently of each other are usually up to about 0.60, preferably up to about 0.55, whereas DSNI, DSNA, DSNC and DSCA independently of each other are usually at least 0.01, suitably at least about 0.05, preferably at least about 0.10 and more preferably at least about 0.15.
  • the ranges of DSNI, DSNA, DSNC and DSCA independently of each other are usually from about 0.01 to about 0.60, preferably from about 0.05 to about 0.55.
  • Cellulose derivatives that are anionic or amphoteric usually have a degree of anionic substitution (“DSA ”) in the range of from 0.01 to about 1.0 as long as DSNI and DSNA are as defined herein; suitably from about 0.05, preferably from about 0.10, and more preferably from about 0.15 and suitably up to about 0.75, preferably up to about 0.55.
  • DSA degree of anionic substitution
  • DSNA is 0.60.
  • suitable cellulose derivatives having degrees of substitution as defined above include the water ⁇ soluble low DS carboxyalkyl cellulose derivatives.
  • the water ⁇ soluble cellulose derivatives suitably has a solubility of at least 85% by weight, based on total weight of dry cellulose derivative, in an aqueous solution, preferably at least 90% by weight, more preferably at least 95% by weight, and most preferably at least 98% by weight.
  • An exemplary preferred ECA is ECA 720.
  • the quick inverting cationic polyacrylamide emulsions disclosed herein have been found to have excellent fixative and retentive properties in pulp and paper systems.
  • the two cationic quick inversion polymers are used together in the same furnish, a synergistic effect can be seen.
  • the fixation polymer is added, followed by the ECA, in turn followed by the addition of the retention polymer provides for separate and synergistic benefits including one or more of the following: 19 Docket No.: 1149704.052013
  • the high charge quick inversion fixation polymer enhances the fixation of ECA to the anionic fibers without damaging paper sheet formation optionally at high polymer dosage levels
  • the high charge quick inversion fixation polymer promotes the fixation of the anionic ECA product and other anionic colloidal particles onto the anionic fibers
  • the high charge quick inversion fixation polymer more efficiently promotes fixation of ECA than traditional charge fixation/control agents (CCA) such as
  • the methods and polymer/ECA combination of the current invention may be added to any process water from pulp, paper, or board production and/or to thick or thin stock used in pulp, paper, or board production.
  • the stock will preferably 20 Docket No.: 1149704.052013 predominantly or entirely comprise virgin or Kraft fibers, and optionally may comprise some recycled fibers, and/or mill broke fibers.
  • the fiber stock comprises at least 50%, 60%, 70%, 80%, 90% or 100% by weight of virgin or Kraft fibers, and may comprise some recycled fibers, although the preferred use of the inventive methods is for treating stock comprising virgin or Kraft fibers. In some instances such fibers may contain starch, in some instances a significant amount of starch.
  • Thick stock is here understood as a fibrous stock or furnish, which has consistency of above 1% (i.e., above 10 g dry solids/L of stock) and thin stock has consistency of below 1% (i.e., below 10 g dry solids/L of stock).
  • These fiber stock fractions optionally may comprise elevated amounts of low molecular weight (LMW) starch, hydrophobics, fines, filler/pigment, dye or the like.
  • LMW low molecular weight
  • a thick or thin stock again will preferably predominantly comprise virgin or Kraft fibers, and optionally may comprise some recycled fibers, and/or mill broke fibers, optionally originating from different sources, e.g., including recycled fiber materials and/or mill broke and/or coated broke.
  • the treated fiber stock which predominantly comprises Kraft or virgin fibers, optionally may comprise some fibers originating from recycled paper, old corrugated containerboard (OCC), mixed office waste (MOW), old magazine (OMG), unbleached Kraft pulp, neutral sulphite semi chemical (NCCS) pulp and/or mechanical pulp.
  • OCC old corrugated containerboard
  • MOW mixed office waste
  • OMG old magazine
  • NCCS neutral sulphite semi chemical pulp
  • the treated fiber stock, predominantly or entirely comprising virgin or Kraft fibers may contain variable amounts of colloidal fines, colloidal particles, filler, hydrophobic, and hydrophilic particles, depending on fiber source and paper mill processing methods. Additionally, fiber suspensions are often diluted with paper mill white water, which also contains variable amounts of colloidal fines and the like.
  • Furnish or fiber stock which used in the present invention may contain low levels of fines (e.g., fines content ranging from 0.1% – 5%, more typically 0.1% – 0.2% on a mass dry fine to volume basis) or high levels of fines (e.g., fines content ranging from 5% – 15%).
  • the definition of “fines” for the current application is any suspended particle smaller than 125 P filter (e.g., 0.76 micron or 200 mesh).
  • the retention and fixation polymers of the present invention may employ solutions of the subject quick inversion cationic retention and fixation polymers, which may be used as pump and go products, optionally not requiring conventional polymer inverting and aging tanks.
  • polyacrylamide emulsions such as cationic retention aids 21 Docket No.: 1149704.052013 having molecular mass values in the range of 10 to 20 million Dalton and SV > 4.5 mPas, do not instantly invert in water under a normal mixing speed ( ⁇ 500 RPM), and pre ⁇ diluted conventional polymer solutions should be aged for a minimum of 30 minutes prior to use.
  • the retention and fixation polymers may be synthesized off site and delivered to a paper mill, and then mixed on ⁇ site. Alternatively, the retention and fixation polymers may be pre ⁇ blended off site, prior to arrival at the paper mill, then delivered as pre ⁇ blended emulsion polymers to customer sites.
  • the retention and fixation quick inversion polymer solutions can be produced by injecting the emulsions into a high shear water pump, and inverting the mixture optionally via a static mixer before pumping the polymer solution onto paper machines.
  • Increased synergistic effects of the inventive combination may be observed when the fixation polymer is used in combination with an optimized amount of the retention polymer, i.e., optimized ratios.
  • the retention polymer has higher molecular weight than the fixative polymer and has been found to be more effective at mechanical retention; i.e., the retention polymer is better for fiber to fiber bridging.
  • the fixative polymer has a lower molecular weight than the retention polymer and has been found to be more effective at fixation of the ECA to the fiber; i.e. it is a better fixative. Without being bound by theory, it can be reasoned that the combination of polymers at an optimal blend ratio provides both optimal fixation and better mechanical retention of the ECA, providing a possible mechanistic rationale for the synergistic benefits of the combination.
  • Optimal ratios mass ratio of fixation/retention polymer are dependent on many variables including, but not limited to, paper mill, point of addition to the paper making process, furnish characteristics including pH, conductivity, and content of starch, fines, hydrophobics, ash, and/or dyes.
  • the ratio of the retention and fixation polymers may range from ⁇ 90/10 to less than 1/99, and preferably range from 85/15 to 15/85.
  • the 2 polymer solutions elicit a synergistic or additive increase in ECA retention compared to the administration of equivalent dosage levels of the retention or fixation polymer alone.
  • the invention provides methods for using the retention and fixation polymers for treatment of starch ⁇ containing fiber stock and/or mill broke fibers and/or process water in the manufacture of paper or board.
  • the treatment is effected prior to the use of the treated fiber stock in a papermaking process or other industrial process using cationic functional polymers or other papermaking chemicals.
  • Said retention and fixation polymers may be separately injected into the process stream at several points in the manufacturing process including, but not limited to Chemical(s) addition point 1, upstream of thickening, wherein said fiber stock has consistency (i.e., percent oven dry mass in the stock) of less than approximately 10%, 5%, 2%, 1%, or 0.65% (see Figure 4).
  • Addition of the inverted solution of cationic polymers to the fiber suspension before the thickening step is advantageous as the enrichment of the ECA in the water circulation is effectively prevented in most processes, and a large amount of the ECA is effectively retained on the fibers. 22 Docket No.: 1149704.052013 [0140] Said retention and fixation polymers may also be added at Chemical(s) addition point 2(see Figure 4), upstream of forming and/or pressing and/or drying, wherein said fiber stock has consistency (i.e., percent oven dry mass in the stock) of approximately 10 ⁇ 30%. Said methods of the current invention are effected to trap and retain ECA that may otherwise be lost or degraded, thereby protecting ECA for incorporation into paper or board.
  • Optimal ratios are empirically pre ⁇ determined for each paper mill and fiber stock composition to elicit a synergistic or additive increase in ECA retention without over ⁇ flocculation of fibers or formation of hydrophobic substances, such as stickies or flocs, in the stock.
  • Solutions of the retention and fixation polymers may also be added to the fiber suspension before washing and/or cleaning of the fiber suspension for improving ECA retention and filtration of the fiber suspension, wherein it may be achieved cleaner filtrate, and higher fines content in fiber suspension to which hydrophobics, sizing agent, fillers, dyes or the like can associate. Solutions of the retention and fixation polymers may also be separately added to fiber suspensions before a machine chest or before a mixing chest of a paper or board machine.
  • Optimal dosage levels for plant applications will be dependent on paper mill, fiber and furnish characteristics, consistency, point of addition, and the ratio of the retention and fixation polymers.
  • the retention and fixation polymers of the present invention provide great dosage latitude for increased ECA fixation and retention without over ⁇ flocculating or damaging sheet formation.
  • a papermaking method which comprises the addition of an engineered cellulose additive (ECA), optionally to replace virgin fiber and/or starch and/or as a strength booster, wherein said papermaking method comprises the use of: (i) a high ⁇ charge quick inversion fixation copolymer which comprises 2 ⁇ (acryloyloxy)ethyl] trimethylammonium chloride (Q9) (cationic) and acrylamide monomers (“fixation polymer”); (ii) anionic ECA; and (iii) a high molecular weight quick inversion cationic retention polymer which comprises Q9 (cationic) and acrylamide monomers (“retention polymer”); wherein each are separately added to the papermaking system.
  • ECA engineered cellulose additive
  • a method for treating fiber stock and/or process water used in pulp, paper, or board production, which preferably predominantly comprises Kraft or virgin fibers comprising obtaining said fiber stock and/or process water and treating said fiber stock and/or process water with: (i) a high ⁇ charge quick inversion fixation copolymer which comprises Q9 (cationic) and acrylamide monomers (“fixation polymer”); (ii) anionic ECA; and (iii) a high molecular weight quick inversion cationic retention polymer which comprises Q9 (cationic) and acrylamide monomers (“retention polymer”); wherein each are each separately added to the fiber stock and/or process water.
  • fixation copolymer which comprises Q9 (cationic) and acrylamide monomers
  • anionic ECA anionic ECA
  • retention polymer a high molecular weight quick inversion cationic retention polymer which comprises Q9 (cationic) and acrylamide monomers
  • a method for manufacture of paper or board, where a fiber web is formed from an aqueous suspension of fibers comprising: ⁇ providing an aqueous fiber suspension, which preferably predominantly comprises Kraft or virgin fibers, and optionally comprises recycled fiber material and/or coated broke, ⁇ optionally diluting the aqueous fiber suspension, ⁇ delivering the aqueous fiber suspension to a headbox, draining the aqueous fiber suspension on a wire screen to form a wet fibrous web, and ⁇ pressing and drying the wet fibrous web to obtain a web of paper or board, which process includes the separate addition of (i) a high ⁇ charge quick inversion fixation copolymer which comprises Q9 (cationic) and acrylamide monomers, (ii) ECA and (iii) a high molecular weight quick inversion cationic retention polymer which comprises Q9 (cationic) and acrylamide monomers wherein each of (i) (ii) and (iii) are each separately added during manufacture.
  • Embodiment A, B or C wherein the high ⁇ charge quick inversion fixation copolymer (fixation polymer) promotes fixation of the ECA and optionally other colloidal particles to the anionic fibers and/or the high molecular weight quick inversion cationic polymer (retention polymer) promotes retention of ECA, and optionally fines and other colloidal particles in the fibrous web.
  • the high ⁇ charge quick inversion fixation polymer comprises 30 to 40 mol% of Q9 monomers and a standard viscosity (SV) of between 1.7 to 2.0 cPs. 24 Docket No.: 1149704.052013 F.
  • the high molecular weight quick inversion cationic retention copolymer comprises 20 to 30 mol% of Q9 monomers and has a standard viscosity (SV) of between 3.0 to 3.5 cPs.
  • G The method of any of the previous Embodiments, wherein (i) the high charge quick inversion fixation polymer is initially added to the papermaking system; (ii) ECA is added to the papermaking system after the addition of the high charge quick inversion fixation polymer; and (iii) the high molecular weight quick inversion cationic retention polymer is added after the addition of ECA to the papermaking system.
  • the method of any of the previous Embodiments, wherein the combined dosage of the retention and fixation polymer is equal to or greater than ECA.
  • CCA charge fixation/control agents
  • the total dosage by weight of the high charge quick inversion cationic fixation polymer and the high molecular weight quick inversion cationic retention polymer ranges from about 0.8 to about 20 times the amount of the ECA, about 1.0 to about 10 times the amount of the ECA, about 1.0 to about 5.0 times the amount of the ECA, about 1.0 to about 3.0 times the amount of the ECA, about 1.0 to about 2.0 times the amount of the ECA, or is about equal to the amount of the ECA added to the papermaking system.
  • weight quick inversion cationic retention polymer added to the papermaking system ranges from (i) about 1/20 to about 20/1 by weight; (ii) about 1/10 to about 10/1 by weight; (iii) about 2/10 to about 10/2 by weight; (iv) about 3/10 to about 10/3 by weight; (vi) about 3/8 to about 8/3 by weight; (vii) about 3/7 to about 7/3 by weight; (viii) about 4/6 to about 6/4 by weight; (ix) about 5.5/4.5 to about 4.5/5.5 by weight; or (x) about equal amounts by weight of the quick inversion cationic retention polymer added to the papermaking system.
  • the fiber suspension comprises at least 50 weight ⁇ %, preferably at least 60 weight ⁇ %, more preferably at least 70 weight ⁇ %, or even more preferably at least 80 weight ⁇ % or 100 weight ⁇ %, of Kraft or virgin fibers;
  • the polymers and ECA are separately added to a fiber suspension having consistency of above 30 g/l;
  • the polymers and ECA are separately added to a fiber suspension having a consistency of below 20 g/l;
  • the polymers and ECA are added to said fiber stock prior to washing and/or cleaning and/or thickening, wherein said fiber stock has consistency (i.e., percent oven dry mass in the stock) of less than approximately 4%, 2%, or 1%;
  • the polymers and ECA are added to said fiber stock prior to forming and/or pressing and/or drying, wherein said fiber stock optionally has a consistency (i.e., percent oven dry mass in the stock) of approximately 15 ⁇ 35%;
  • a fiber stock preferably comprising a high content of virgin or Kraft fibers, e.g., at least 50 ⁇ 60 weight ⁇ % of virgin or Kraft fibers, and optionally comprising small amounts of recycled fibers, e.g., at most 5 ⁇ 10 weight ⁇ %, and/or starch, for use in pulp, paper or board production, which comprises and/or has been treated with a composition comprising a combination of cationic polymers and ECA, optionally produced according to any of the foregoing Embodiments.
  • the fiber stock of Embodiment V which comprises at least 50 weight ⁇ %, preferably at least 60 weight ⁇ %, more preferably at least 70 weight ⁇ %, or even more preferably at least 80 weight ⁇ % or 90 weight ⁇ %, of Kraft or virgin fibers.
  • Polymers were prepared according to standard makedown procedures. [0151] For each measurement, an aliquot of stock was poured into the DDA stirring jar where additives were dosed in accordance with machine conditions. After mixing, the stock is drained through a paper machine wire and the filtrate is collected in a vessel. The drain time is recorded and used as a measure of drainage performance. [0152] The filtrate is then measured for turbidity using a Hach 2100Q turbidimeter. Lower turbidity values indicate better retention of fiber, fines, and colloidal and particulate materials.
  • the incumbent system again utilizes a charge control agent (CCA) to fix the ECA onto the fiber.
  • CCA charge control agent
  • a traditional retention polymer is used in the incumbent system to retain fiber, fines and other papermaking additives.
  • the same quick inversion polymers were evaluated as CCA replacement products and also as a dual component system where the higher charge fixative was used to fix the ECA to the fiber and the lower charge polymer was used as a retention aid by comparing the effects thereof on filtrate turbidity in the DDA system.
  • the timing of addition was ECA @ 10 seconds, Polymer A @ 15 seconds, Polymer B @ 75 seconds.

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Abstract

L'invention concerne de manière générale une nouvelle combinaison comprenant 2 polymères cationiques différents et un additif de cellulose modifié (ECA) et son utilisation pour favoriser la rétention d'additifs cellulosiques modifiés (ECA) sur des fibres anioniques et des colloïdes et dans la bande de fibres pendant la fabrication du papier, éventuellement le processus de fabrication de papier utilisant principalement ou entièrement des fibres Kraft ou vierges.
EP23904554.5A 2022-12-14 2023-12-14 Rétention améliorée d'additifs cellulosiques modifiés à l'aide d'une combinaison synergique de polymères cationiques Pending EP4623147A1 (fr)

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US202263387298P 2022-12-14 2022-12-14
FI20235307 2023-03-16
PCT/US2023/083948 WO2024129932A1 (fr) 2022-12-14 2023-12-14 Rétention améliorée d'additifs cellulosiques modifiés à l'aide d'une combinaison synergique de polymères cationiques

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EP4623147A1 true EP4623147A1 (fr) 2025-10-01

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EP23904554.5A Pending EP4623147A1 (fr) 2022-12-14 2023-12-14 Rétention améliorée d'additifs cellulosiques modifiés à l'aide d'une combinaison synergique de polymères cationiques

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EP (1) EP4623147A1 (fr)
KR (1) KR20250120293A (fr)
CN (1) CN120418503A (fr)
WO (1) WO2024129932A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011113119A1 (fr) * 2010-03-19 2011-09-22 Fibria Celulose S/A Procédé pour le traitement de pâtes de cellulose, pâte de cellulose ainsi obtenue et utilisation de biopolymère pour le traitement de pâtes de cellulose
FI20116163L (fi) * 2011-11-23 2013-05-24 Upm Kymmene Corp Menetelmä ja järjestelmä selluloosamateriaalin valmistamiseksi
FI125714B (en) * 2012-11-12 2016-01-15 Kemira Oyj A process for treating fibrous pulp for making paper, cardboard or the like, and a product
FI127284B (en) * 2015-12-15 2018-03-15 Kemira Oyj A process for making paper, cardboard or the like
EP3481994B1 (fr) * 2016-09-30 2020-04-15 Kemira Oyj Procédé de fabrication de papier, de carton ou similaire

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KR20250120293A (ko) 2025-08-08
CN120418503A (zh) 2025-08-01
WO2024129932A1 (fr) 2024-06-20

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