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WO2025006743A2 - Utilisation de polymères en émulsion amphotères avec des résines résistantes en tant qu'auxiliaires de rétention et de drainage - Google Patents

Utilisation de polymères en émulsion amphotères avec des résines résistantes en tant qu'auxiliaires de rétention et de drainage Download PDF

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Publication number
WO2025006743A2
WO2025006743A2 PCT/US2024/035812 US2024035812W WO2025006743A2 WO 2025006743 A2 WO2025006743 A2 WO 2025006743A2 US 2024035812 W US2024035812 W US 2024035812W WO 2025006743 A2 WO2025006743 A2 WO 2025006743A2
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WIPO (PCT)
Prior art keywords
cationic
acrylamide
chloride
ranging
acid
Prior art date
Application number
PCT/US2024/035812
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English (en)
Inventor
Jennifer RISER
Junhua Chen
Yuping Luo
Original Assignee
Kemira Oyj
Kemira Water Solutions, Inc.
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Filing date
Publication date
Application filed by Kemira Oyj, Kemira Water Solutions, Inc. filed Critical Kemira Oyj
Publication of WO2025006743A2 publication Critical patent/WO2025006743A2/fr

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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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/002—Tissue paper; Absorbent paper

Definitions

  • the disclosure provides methods for enhancing retention and drainage by addition of a retention and drainage aid comprising reactive cationic polymers (e.g., cationic strength resins), water-soluble amphoteric terpolymers, and optionally anionic organic or inorganic microparticles.
  • a retention and drainage aid comprising reactive cationic polymers (e.g., cationic strength resins), water-soluble amphoteric terpolymers, and optionally anionic organic or inorganic microparticles.
  • a retention and drainage aid comprising reactive cationic polymers (e.g., cationic strength resins), water-soluble amphoteric terpolymers, and optionally anionic organic or inorganic microparticles.
  • Preparation of paper sheets under these conditions provides improved retention, drainage time, STFI and burst strength, and improved hydrophobic particle control.
  • B ACKGROUND OF THE INVENTION t00031 Glyoxylated polyacrylamide (GPAM) is generally used in a variety of paper
  • Glyoxylated polyacrylamide is also applied to increase the compression strength and the dimensional stability of many board-grade paper products.
  • a dilute aqueous composition known as "furnish” or "stock” is sprayed onto a moving mesh known as a "wire” or “wire screen”.
  • Solid components of this composition such as cellulosic fibers, fines, and inorganic particulate mineral fillers are drained or filtered by the wire to form a paper sheet.
  • the percentage of solid material retained on the wire is known as the "first pass retention" of the papermaking process' t00051
  • Paper and board manufacturers require chemical additives that will effectively provide enhanced on-machine retention and drainage while also providing additional benefits, such as improved paper strength and wet pressability. These requirements are especially challenging for papermaking operations in mills with high recycled content.
  • t0066l Retention is a function of different mechanisms, such as filtration by mechanical entrainment, electrostatic attraction, and bridging between the fibers and the fillers in the furnish. Because both the cellulosic fibers and many common filler materials are negatively charged, they are mutually repellent. Generally, the only factor tending to enhance retention is mechanical entrainment.
  • a retention aid is generally used to improve retention of the fibers and fillers on the wire.
  • tO6O7l Drainage relates to the rate of removal of water from the furnish as the paper sheet is formed. Drainage usually refers to only water removal which takes place in the "drainage zone" (gravity and vacuum sections) of the paper machine primarily before any pressing of the wet paper web subsequent to formation of the web. Thus, drainage aids are used to improve the overall efficiency of dewatering in the production of paper or paperboard' Arrv Docrer No. I 149704.062013 C LIENT REP NO.
  • U52324 tooo8l lmprovements in retention and drainage of the final paper or paperboard sheet are particularly desirable for several reasons, the most significant of which is productivity' Good retention and good drainage enable a paper machine to run faster and to increase production.
  • tggogl These improvements are realized by the use of retention and drainage aids.
  • These retention and drainage aids are generally added to the furnish as the furnish approaches the headbox of the paper machine and may comprise a coagulant/flocculant system used in conjunction with one or more shearing stages.
  • t00101 A coagulant is typically a low molecular weight cationic synthetic polymer that reduces the negative surface charges on the fiber, fines, and/or filler particles to accomplish agglomeration of such particles.
  • the flocculant which generally is a high molecular weight cationic, nonionic, or anionic synthetic polymer, bridges the particles and/or agglomerates, from one surface to another, thereby binding the particles into larger flocs.
  • the larger flocs increase retention of the particles; however, as they are filtered out of the water onto the fiber web, the pores of the flocs are covered, thereby reducing the drainage efficiency of the fiber web.
  • the larger flocs can be broken down by shearing which is provided by one or more of the cleaning, mixing and pumping stages of the papermaking process.
  • Particulate foreign material is separated from the pulp in the pulper or at the screening. Some substances are naturally retained on the fibers and do not disturb the process. Other substances, such as stickies, may be separated from the pulp at the screening and at least partly removed from the process.
  • tOO14l Use of recycled fiber material as raw material is the main source of hydrophobic substances, so called stickies, in paper and board making. While some or even most of these hydrophobic substances are removed during the pulping of recycled fiber raw materials, substantial amounts are still carried over during the paper or board making process. Hydrophobic substances, which have not been removed in de-inking or other recycled fiber processing stages, e.g., which are not trapped by the screens, enter the paper or board machine and circulate in the process waters.
  • Coated broke contaminant deposition in papermaking systems can cause serious operational problems if left uncontrolled.
  • Coated broke is repulped and used as a furnish source at most coated fine paper mills.
  • the most difficult problem involved with recycling coated broke is derived from the binder materials, sometimes in combination with pigments or fillers, since these polymers and the materials to which they have been attached, are the origin of sticky deposits. These sticky deposits cause difficulties when recycled back to the paper machine operation. Formed deposits may cause web breakages, so as a precautionary measure the most affected surfaces, such as drying cylinders, calendars, wires and felts, are being regularly washed and cleaned, which leads to downtime and loss of production. tog16l Considerable effort has been directed toward developing improved retention and drainage aids.
  • PCT/U599/29L35 discloses a polyampholyte coagulant, which is used as a retention/drainage/formation aid in a papermaking process.
  • retention and drainage aids remain inadequate for manufacture of paper and board with a high percentage of recycled fiber content.
  • tOO17l High molecular weight polymeric additives and retention aid polymers added tend to hold water during the first passes in the press section, which dramatically increases drain time and reduces wet pressability of the fibrous web.
  • a retention and drainage aid that would allow for more efficient dewatering in the press section and faster drying of the paper web in the dryer section would lead to significant steam savings and faster productivity for the paper manufacturer' t001Sl
  • the present invention generally relates to methods and compositions for manufacture of tissue, paper, or board and for enhancing retention and drainage thereof. ln particular, the disclosure provides methods for enhancing retention and drainage by addition of a retention and drainage aid comprising reactive cationic polymers (e.g., cationic strength resins), water-soluble amphoteric terpolymers, and optionally anionic organic or inorganic microparticles.
  • a retention and drainage aid comprising reactive cationic polymers (e.g., cationic strength resins), water-soluble amphoteric terpolymers, and optionally anionic organic or inorganic microparticles.
  • the present invention provides a method for manufacture of tissue, paper, or board, the method comPrising: tO021l (a) forming or providing an aqueous suspension comprising cellulosic fibers; l0122l (b) optionally diluting the aqueous suspension; Arrv Docrnr No. 1149704.062013 CLIENT REF NO.
  • U52324 I0O23l (c) flocculating the aqueous suspension to form a flocculated fiber suspension; lOO241(d) removing sufficient water from the flocculated fiber suspension to form a wet fibrous web, preferably by introducing the flocculated fiber suspension into a headbox and draining the flocculated fiber suspension on a wire screen; and tOO25l (e) pressing and drying the wet fibrous web to obtain a tissue, paper, or board; t00261 wherein the method further comprises prior to step (c) treating the aqueous suspension comprising cellulosic fibers with a retention and drainage aid comprising: lOO27l (i) one or more reactive cationic polymers; and [0028] (ii) one or more water-soluble amphoteric polymers.
  • said retention and drainage aid optionally further comprises one or more anionic organic or inorganic microparticles. to030l ln some exemplary embodiments of the method (i)said one or more reactive cationic polymers, (ii) said one or more water-soluble amphoteric polymers, and optionally (iii) said one or more anionic organic or inorganic microparticles: tOO31l (a) are added sequentially in any order, simultaneously, or premixed prior to addition; or t0632l (b) are added sequentially in the order of (i), (ii), and then optionally (iii), wherein a mixing time is allowed after each addition and said mixing time ranges from 0.01-10 min, 0.1-5 min, or I-2 min.
  • said one or more reactive cationic polymers comprise: tOO34l (a) functional groups that are reactive to cellulosic or lignocellulosic fiber surfaces; and to035l (b) a cationic charge density ranging from below 5.0 mEq/g, 0.5-5'0 mEq/8,I.O-4.O mEqf g, or L.5-2.5 mEq/g as dry solids at pH 7; [0036] and further comprise one of the following; t0o37l (c) one or more cationic glyoxalated polyacrylamides (GPAMs); t003Sl (d) one or more cationic polyamidoamine-epichlorohydrin (PAE) resins; or to039l (e) a combination of one or more cationic GPAMs and one or more cationic PAE resins having a ratio of PAE to GPAM
  • said one or more cationic GPAMs [0041] (a) are suitable for use as a dry and/or wet strengthening agent; t9042l (b) are synthesized by reacting glyoxal with a base polymer, wherein said base polymer comprises a weight average molecular weight ranging from 5-5000 kDa, 50-2500 kDa, 80-2000 kDa, or 100-1000 kDa and comprises nonionic monomers, cationic monomers, and optional anionic monomers, wherein Arrv DocrBr No. 1149704.062013 CLIENT REF NO.
  • said nonionic monomers are selected from the group of primary amide-containing monomers comprising acrylamide, methacrylamide, ethyl acrylamide, crotonamide, N-methyl acrylamide, N-butyl acrylamide, N-ethyl methacrylamide, and any combination thereof; tOO44l
  • said cationic monomers are selected from acryloyloxyethyltrimethyl ammonium chloride ("AETAC” ), methacryloyloxyethyltrimethyla mmonium chloride (“MAETAC”), methacrylamidopropyltrimethylammonium chloride ('MAPTAC” ), acrylamidopropyltrimethylammonium chloride (“APTAC”), methacryloyloxyethyldimethylammonium sulfate, diallyldimethylammonium chloride (“DADMAC”); dialkylaminoalkyl acrylates and dialky
  • said one or more water-soluble amphoteric polymers are comprised of acrylamide (AM) monomers, one or more anionic monomers, and one or more cationic monomers, wherein, t0o56l (i) said one or more anionic monomers contain functional groups selected from the group consisting of carboxylic acids, sulfonic acids, phosphonic acids, their corresponding water soluble salts, their corresponding water dispersible salts, and any combination thereof, including but not limited to, acrylic acid, methacrylic acid, maleic acid, itaconic acid, vinyl sulfonic acid, 2-acrylamido- 2-methylpropane sulfonic acid (AMPS), acrylamido methanesulfonic acid, acrylamido ethanesulfonic acid, 2-hydroxy-3-acrylamide propane sulfonic acid, styrene sulfonic acid, vinyl benzene
  • said one or more anionic organic or inorganic microparticles are selected from the group of microparticles and nanoparticles consisting of silica microparticles; colloidalsilica; aluminum phyllosilicate mineral particles, including but not limited to bentonite, sodium bentonite, calcium bentonite, and montmorillonite; and anionic polymer microparticles, including but not limited to highly structured anionic polyacrylamides.
  • said one or more reactive cationic polymers comprises said one or more cationic GPAMs and/or said one or more cationic PAE resins in aqueous form; 10068l
  • said one or more cationic GPAMs comprise said base polymer comprising cationic monomers selected from DADMAC, AETAC, and combinations thereof; nonionic monomers selected from acrylamide, methacrylamide, and combinations thereof; and optionally anionic monomers selected from acrylic acid and/or corresponding water soluble salts, water dispersible alkali metal salts, alkaline earth metal salts, ammonium salts, and combinations thereof, or said base polymer comprises (i)acrylamide and DADMAC, (ii)acrylamide and AETAC, or (iii)acrylamide, DADMAC, and AETAC, [0069] (c) said one or more water-soluble amphoteric polymers tOO7Ol (
  • the method when used for manufacture of tissue, paper, or board, the method results in: [OOS3] (a) improved retention of said cellulosic fibers; a t0084l (b) improved drainage of said flocculated fiber suspension; [0085] (c) improved STFI and/or burst strength; tOOS6l (d) a reduced hydrophobic particle and/or hydrophobic agglomerate counU t00871 (e) an improved dry tensile, immediate wet tensile, and/or soaked wet tensile strength; or [0088j (f) any combination of (a)-(e) tOOSgl compared to a tissue, paper, or board prepared by an identical method in the absence of (i) addition of said one or more reactive cationic polymers or (ii) addition of said one or more water- soluble amphoteric polymers.
  • the present invention provides a method for manufacture of tissue, paper, or board, the method comprising: tO091l (a) forming or providing an aqueous suspension comprising cellulosic fibers; [0092] (b) optionally diluting the aqueous suspension; [00931 (c) flocculating the aqueous suspension to form a flocculated fiber suspension; t0o94l (d) removing sufficient water from the flocculated fiber suspension to form a wet fibrous web, preferably by introducing the flocculated fiber suspension into a headbox and draining the flocculated fiber suspension on a wire screen;; and t6095l (e) pressing and drying the wet fibrous web to obtain a tissue, paper, or board; Arrv Doc No.
  • step (i) one or more reactive cationic polymers comprising functional groups that are reactive to cellulosic or lignocellulosic fiber surfaces and a cationic charge density ranging from below 5.0 mEq/g,0.5-5.0 mEqlg, L.0-4.0 mEq/g, or 1.5-2.5 mEq/g as dry solids at pH 7, wherein said one or more reactive cationic polymers comprise one or more cationic glyoxalated polyacrylamides (GpAMs); one or more cationic polyamidoamine-epichlorohydrin (PAE) resins; or a combination of one or more cationic GPAMs and one or more cationic PAE resins
  • GpAMs cationic glyoxalated polyacrylamides
  • PAE cationic polyamidoamine-epichlorohydrin
  • the present invention provides a composition for use as a retention and drainage aid in manufacture of tissue, paper, or board, the composition comprising: tOlOSl (a) one or more reactive cationic polymers comprising a cationic charge density ranging from below 5.0 mEq/g,0.5-5.0 mEq/g, L.0-4.0 mEq/g, or 1.5-2.5 mEq/g as dry solids at pH 7, wherein said one or more reactive cationic polymers comprise t01O9l (i) one or more cationic glyoxalated polyacrylamides (GPAMs) synthesized by reacting glyoxal with a base polymer, wherein said base polymer comprises a weight average molecular weight ranging from 5-5000 kDa, 50-2500 kDa, 80-2000 kDa, or 100-1000 kDa; (i) acrylamide and DADMAC, (ii) acrylamide and AETAC
  • FIG 1 provides an exemplary variability chart showing DDA drain time (sec) for recycled towels prepared from LOO%OCC furnish treated with PAE and amphoteric emulsion polymers with or without silica according to Example 1.
  • t01i.7l FtG 2 provides an exemplary variability chart showing filtrate turbidity (NTU) for recycled towels prepared from 1rOO% OCC furnish treated with PAE and amphoteric emulsion polymer with or without silica according to Example 1.
  • tO118l FtG 3 provides an exemplary variability chart showing DDA drain time (sec) for recycled towels prepared from LOO% OCC furnish treated with GPAM and amphoteric emulsion polymer with or without silica according to Example 1.
  • tO1i.gl FIG 4 provides an exemplary variability chart showing filtrate turbidity (NTU) for recycled towels prepared from LOO% OCC furnish treated with GPAM and amphoteric emulsion polymer with or without silica according to Example 1.
  • FIG 5 provides an exemplary graph of DDA drain time (sec) vs. polymer dosage for a packaging grade furnish with conductivity 3.84 mS/cm treated with reference cationic polyacrylamide (CPAM, solid line) + GPAM and an amphoteric emulsion polyacrylamide (amPAM, dashed line)+ GPAM according to Example 3.
  • IOI2I FtG 5 provides an exemplary graph of DDA drain time (sec) vs.
  • tO1,Z2l FtG 7 provides an exemplary bar graph of filtrate turbidity (NTU) vs. polymer dosage for a reference cationic polyacrylamide (CPAM) and an amphoteric emulsion polyacrylamide (amPAM)for packaging grade liner sheets at three conductivity levels according to Example 3. ArrY DocKEr No. I149704.062013 CLIENT REF NO.
  • U52324 to123l FtG 8 provides an exemplary graph of strength (GM STFI) vs. GPAM dosage for packaging grade liner sheets prepared with amphoteric emulsion polyacrylamide or dry amphoteric polyacrylamide according to Example 4.
  • lOI24l FIG 9 provides an exemplary bar graph of strength properties (STFI and Burst strength) of handsheets prepared according to Example 5.
  • t01251 FIG 10 provides an exemplary variability chart showing DDA drain time (sec) for towels prepared from LOO% recycled mixed office paper according to Example 6.
  • FtG 11 provides an exemplary variability chart showing filtrate turbidity (NTU) for towels prepared from IOO% recycled mixed office paper according to Example 6.
  • t0129 As used herein, the term “or” in the claims is used to mean “andf or” unless explicitly indicated to refer to alternatives only or the alternatives are mutually exclusive, although the disclosure supports a definition that refers to only alternatives and “and/or.” t01301 As used herein the term “or combinations thereof' as used herein refers to all permutations and combinations of the listed items preceding the term unless stated otherwise. [0131] PAPERMAKING to132l As used herein, the term “paper” includes products comprising a cellulosic sheet material including paper sheet, paperboard, and the like.
  • papermaking process and “papermaking application” generally refers to any process in which any form of paper and/or paperboard product may be produced'
  • processes include making paper products from pulp, such as methods comprising forming an aqueous cellulosic papermaking furnish, draining the furnish to form a sheet, and drying the sheet. The steps of forming the papermaking furnish, draining and drying may be carried out in any conventional manner generally known in the art.
  • wet end of a paper machine or “wet end” generally refer to the parts of a papermaking process between pulping (or bleaching) and wet-pressing of the paper.
  • the term "fiber” refers to the basic structural unit of paper or board. t01361
  • the terms “recycled fiber/' and “recovered fiber” refer to paper, paperboard, and fibrous wastes from retail stores, office buildings, homes, manufacturing plants, and so forth, after they have passed through their end-usage as a consumer item.
  • Manufacturing wastes include: dry paper and paperboard waste generated after completion of the papermaking process including by way of example: envelope cuttings, bindery trimmings, and other paper and paperboard waste resulting from printing, cutting, forming, and other converting operations; bag, box, and carton manufacturing wastes; mill wrappers, and rejected unused stock; and repulped finished paper and L1.
  • recycled fibers includes recycled fibers derived by processing of paper and other consumer cellulosic materials, e.9., 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.
  • Source materials for recycled fibers may be selected from old corrugated containerboard, mixed office waste, old newsprint, old magazines, double liner kraft, and any mixtures thereof.
  • MXW Mixed waste
  • Mixed office waste denotes recycled fiber material mainly containing copying papers, printer papers and offset papers.
  • Double lined kraft denotes recycled fiber material comprising clean sorted unprinted corrugated cardboard cartons, boxes, sheet or trimmings, e.g., of kraft or jute liner.
  • White lined chipboard denotes multiply board comprising deinked fiber materialand/or un-deinked recycled fiber material originating e.g., from OCC, mixed office waste or old newspapers (ONP) in or more of the layers.
  • OCC old corrugated cardboard and/or containerboard' Corrugated refers to those boxes where the materials are made from three separate layers of paper, two liners and a corrugated, or wavy, layer sandwiched between them. Brown paper bags are commonly accepted with OCC for recycling.
  • OCC denotes recycled fiber material which have liners of test liner, jute or kraft, and may cover also double sorted corrugated containerboard (DS occ).
  • the terms "broke” or “mill broke” refer to paper, which during the paper making process becomes suitable only for repulping e.g., trimmings or paper that is out of specification. Broke is re-used material which never left the mill is not regarded as recycled or recovered. Broke is a valuable source of fiber and is recycled internally at the mill.
  • coated broke refers to broke that contains coatings that are applied to the base sheet of paper as it is being manufactured. When the broke contains these coatings, it presents special problems in recycling to recover fiber values because the coatings introduce materials which would not normally be present in the original stock of fiber used to manufacture the base paper sheet.
  • the coated broke may also contain dyes and/or other additives. ln the present application coated broke includes surface-sized, dyed, and/or creped broke. to140j
  • the term "recycled fiber composition” generally refers to a composition comprising recycled cellulosic fibers, typically a composition wherein most or all are recycled fibers, e.g., at least 20,40, 50, 60,70,80,90 or IO0%.
  • the term "fiber suspension” is understood as an aqueous suspension, which comprises fibers, preferably recycled fibers, and optionally fillers.
  • the fiber suspension may comprise at least 5Yo, preferably 10-30 Yo, more preferably tI - L9 % of mineral filler.
  • Mineral filler may be any filler conventionally used in paper and board manufacturing, such as ground calcium carbonate, precipitated calcium carbonate, clay, talc, gypsum, titanium dioxide, synthetic silicate, aluminum trihydrate, barium sulphate, magnesium oxide or their any of mixtures.
  • ArrY DocKEr No. 1149704.062013 C LIENT REP NO. U52324 lOI42l As used herein the term "headbox" refers a receptacle in a papermaking machine that holds suspended aqueous cellulosic solids and which regulates the flow thereof onto a wire or screen that provides for the draining of water therefrom.
  • lignocellulosic substrate refers to a paper and/or paperboard product formed from plant dry matter from any source, virgin or recycled, which may be coated, printed, and/or formed into a packaging product.
  • substrates include paper products made from pulp, such as by methods comprising forming an aqueous cellulosic papermaking furnish, draining the furnish to form a sheet, and drying the sheet. The steps of forming the papermaking furnish, draining and drying may be carried out in any conventional manner generally known in the art.
  • the substrates may contain polymeric strengthening agents, such as wet strength and dry strength agents.
  • slurry generally refers to a mixture of water, dissolved paper pulp, and optionally other soluble or insoluble components produced or added during the stock preparation phase of papermaking.
  • toi.4sl the terms “furnish” or “papermaking furnish” generally refers to a mixture of cellulosic fibers, pulp, optional fillers, dyes, and water from which paper or board is made.
  • to146l the term “thick stock” generally refers to mixture of papermaking pulp and other materials with a consistency of about 1. to 5%.
  • the term “thin stock” generally refers to a mixture of papermaking pulp and other materials, after having been diluted to a consistency below 7%with whitewater or other process water at a fan pump.
  • white wate/' 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.
  • fixation means that a substance is associated or attached onto the fibers at least temporarily or permanently.
  • tO15Ol generally refers to the tendency for fibers to collect together in bunches in the presence of flow, and especially in the presence of retention aids; the same word also refers to the action of high-mass polymers in forming bridges between suspended colloidal particles, causing strong, relatively irreversible agglomeration.
  • t01511 The term “flocculant” may generally refer to a reagent that may bridge neutralized or facilitate coagulation of particles into larger agglomerates, typically resulting in more efficient settling.
  • Flocculation process generally involves addition of a flocculant followed by mixing to facilitate collisions between particles, allowing for the destabilized particles to agglomerate into larger particles that can be removed by gravity through sedimentation or by other means, €.8., centrifugation, filtration.
  • dry strength generally refers to the force or energy required to break a paper sample, by one of various procedures, after equilibration in a standard atmosphere. to153l
  • 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.
  • U52324 to154l polymer molecular weights may be measured by various methods known to persons of skill in the art. For example, weight average molecular weight may be measured using gel permeation chromatography (GPC). Additionally, polymer molecular weights may be measured by GPC/Light Scattering/Viscometry also known as Triple Detection GPC which employs Refractive lndex Detector (with or without UV Detector), Dilute Solution Viscometry and Light Scattering all in series to determine molecular weights, distribution and related solution parameters.
  • GPC gel permeation chromatography
  • Polymer molecular weights may be measured by GPC/Light Scattering/Viscometry also known as Triple Detection GPC which employs Refractive lndex Detector (with or without UV Detector), Dilute Solution Viscometry and Light Scattering all in series to determine molecular weights, distribution and related solution parameters.
  • polymer or “polymeric additives” and similar terms are used in their ordinary sense as understood by one skilled in the art, and thus may be used herein to refer to or describe a large molecule (or group of such molecules) that may comprise recurring units.
  • polymers may be formed in various ways, including by polymerizing monomers and/or by chemically modifying one or more recurring units of a precursor polymer. Unless otherwise specified, a polymer may comprise a "homopolymef that may comprise substantially identical recurring units that may be formed by, for example, polymerizing a particular monomer.
  • a polymer may also comprise a "copolymer'' that may comprise two or more different recurring units that may be formed by, for example, copolymerizing, two or more different monomers, and/or by chemically modifying one or more recurring units of a precursor polymer.
  • a polymer or copolymer may also comprise a "terpOlymer” or a "tetrapolyme/'which generally refer to polymers that comprise three, four, or more different recurring monomer units.
  • the term "polyme/'as used herein is intended to include both the acid form of the polymer as well as its various salts.
  • Polymers may be amphoteric in nature, that is, containing both anionic and cationic substituents, although not necessarily in the same proportions.
  • polyacrylamide or “PAM” generally refer to polymers and co- polymers comprising acrylamide moieties, and the terms encompass any polymers or copolymers, including terpolymers, comprising acrylamide moieties, e.g., one or more acrylamide (co)polymers of acrylamide and additional monomers capable of copolymerizing with acrylamide.
  • pAMs may comprise any of the polymers or copolymers discussed herein.
  • the PAMS described herein may be produced in one of various forms, including, for example, dry (powder ) form (e.g., DPAM), emulsion polyacrylamide (EPAM), or liquid polyacrylamide.
  • Amphoteric polyacrylamides (AmPAM) may be formulated in dry (powder ) form (e.g., AmDPAM), or emulsion form (AmEPAM) ' t0158]
  • the term "amphoteric polymer” refers to polymers containing both anionic and cationic groups on the macromolecular chain.
  • emulsion polymer generally refers to inverse emulsions (water-in- oil) in which water droplets containing the polymer are suspended in an oil phase, also termed a hydrophobic phase.
  • inverse phase emulsion refers to a liquid polymer composition of polymer dissolved in an aqueous solution which is dispersed into an oil phase (e.g', hydrophobic liquid) to form an oil-continuous phase, which is then mixed with an aqueous solution so that the dispersed polymer phase of the liquid polymer composition becomes a substantially aqueous- continuous phase, and the hydrophobic liquid phase becomes a dispersed, discontinuous phase.
  • an oil phase e.g', hydrophobic liquid
  • the t4 Arrv Docrer No. I149704.062013 C LIENT REP NO. U52324 inversion point can be characterized as the point at which the viscosity of the inverted polymer solution has substantially reached its maximum under a given set of conditions.
  • liquid polymer refers to a combination of at least one polymer and a liquid, typically an aqueous liquid.
  • the polymer in a may be thoroughly dissolved or may be a partially dissolved suspension, dispersion, or slurry.
  • An "aqueous polymer mixture” or “hydrated polymer composition” refers to a combination of at least one polymer and an aqueous liquid. When a dry polymer is combined with an aqueous liquid, the polymer is initially partially hydrated at the polymer-water interface.
  • Polymers do not dissolve instantaneously in aqueous or non-aqueous solvents. Dissolution is controlled by either the disentanglement of the polymer chains or by the diffusion of the chains through a boundary layer adjacent to the polymer-solvent interface. After thorough mixing, the polymer may become fully hydrated, at which point the wetting process is complete and the polymer may be either partially dissolved or fully dissolved, depending on the nature and composition of the polymer and solvent.
  • water-soluble polymer generally refers to any polymer that may dissolve and/or disperse in water. Said polymers may modify the physical properties of aqueous systems undergoing gelation, thickening, viscosification, or emulsification/stabilization.
  • Said polymers may perform a variety of functions, including but not limited to use as dispersing and suspending agents, stabilizers, thickeners, viscosifiers, gellants, flocculants and coagulants, film-formers, humectants, binders, and lubricants.
  • the term "monomef generally refers to nonionic monomers, anionic monomers, cationic monomers, zwitterionic monomers, betaine monomers, and amphoteric ion pair monomers.
  • Q9 monomer refers to 2-(acryloyloxy)ethyll trimethylammonium chloride (Q9) which has a molecular formula of C8H16C
  • acrylamide or AM refers to a neutral monomer of molecular formula: C3H5NO and a molecular weight of 71.08 g/mol' to166l
  • acrylic acid or "AA” refers to an anionic monomer of molecular formula: CH2CHCOOH and a molecular weight of 72.O6 g/mol.
  • cationic monomer generally refers to a monomer that possesses a positive charge. Examples thereof include acryloyloxy ethyl trimethylammonium chloride (Q9) monomers. Cationic monomers may also be selected from acryloyloxyethyltrimethyl ammonium chloride ('AETAC”), methacryloyloxyethyltrimethylammonium chloride (“MAETAC”), methacrylamidopropyltrimethylammonium chloride (“MAPTAC”), acrylamidopropyltrimethylammonium chloride ('APTAC”), methacryloyloxyethyldimethylammonium sulfate, diallyldimethylammonium chloride (“DADMAC”); dialkylaminoalkyl acrylates and dialkylaminoalkyl methacrylates and their quaternary or acid salts, including but not limited to, dimethylaminoethyl acrylate, acryloyloxyethyl
  • nonionic monomers may comprise but are not limited to comprising monomers selected from the group consisting of acrylamide ("AMD"), methacrylamido, vinyl, allyl, ethyl, and the like, allof which may be substituted with a side chain selected from, forexample, an alkyl, arylalkyl, dialkyl, ethoxyl, and/or hydrophobic group.
  • ALD acrylamide
  • methacrylamido vinyl
  • allyl ethyl
  • ethyl ethyl
  • a side chain selected from, forexample, an alkyl, arylalkyl, dialkyl, ethoxyl, and/or hydrophobic group.
  • a nonionic monomer may comprise AMD.
  • vinyl amide e.g., acrylamide, meth
  • Nonionic monomers include N-isopropylacrylamide, N-vinylformamide, methacrylamide; N-alkylacrylamides, including but not limited to, N-methylacrylamide, N-ethylacrylamide, N-propylacrylamide, and N- butylacrylamide; N,N-dialkylacrylamides, including, but not limited to, N,N-dimethylacrylamide and N,N-diethylacrylamide; N-alkyl methacrylamides; alkylacrylates; hydroxyalkylacrylates and methacrylates, including but not limited to, hydroxymethyl acrylate, 2-hydroxyethyl acrylate, 3- hydroxypropylacrylate,4-hydroxybutylacrylate, hydroxymethylmethacrylate,2-hydroxyethyl methacryl
  • Nonionic monomers can be combined for example to form copolymers with acrylamide tg169l
  • anionic monomers may refer to either anionic monomers that are substantially anionic in whole or (in equilibrium) in part, at a pH in the range of about 1.0 to about 10.0.
  • the "anionic monomers” may be neutral at low pH (e.g., from a pH of about O-t, O-2, or 0-3) depending on the pKa values of acidic protons contained therein.
  • anionic monomers are obtained in anionic form as alkali metal salts, alkaline earth metal salts, and ammonium salts, e'g., sodium acetate and sodium 2-acrylamido-2-methylpropane sulfonic acid (AMPS).
  • AMPS 2-acrylamido-2-methylpropane sulfonic acid
  • tO17Ol examples of anionic monomers which may be used herein include but are not limited to those comprising acrylic, methacrylic, maleic monomers and the like, sodium acrylate, calcium 1,6 ArrY DocKEr No. I 149704.062013 CLIENT REF NO. U52324 diacrylate, and/or any monomer substituted with a carboxylic acid group or salt thereof.
  • anionic monomers may be substituted with a carboxylic acid group and include, for example, acrylic acid, and methacrylic acid.
  • an anionic monomer which may be used herein may be a (meth)acrylamide monomer wherein the amide group has been hydrolyzed to a carboxyl group.
  • Said monomer may be a derivative or salt of a monomer according to other embodiments. Additional examples of anionic monomers comprise but are not limited to those comprising sulfonic acids or a sulfonic acid group, or both.
  • the anionic monomers which may be used herein may comprise a sulfonic function that may comprise, for example, 2-acrylamido-2-methylpropane sulfonic acid (acrylamido tertiary butyl sulfonic acid or "ATBS").
  • anionic monomers may comprise organic acids.
  • anionic monomers may comprise acrylic acid, methacrylic acid, maleic acid, itaconic acid, acrylamido methylpropane sulfonic acid, vinylphosphonic acid, styrene sulfonic acid and their salts such as sodium, ammonium and potassium.
  • anionic monomers may comprise acrylic acid, methacrylic acid; sulfonic acids, phosphonic acids, maleic acid, itaconic acid, vinyl sulfonic acid, 2-acrylamido-2-methylpropane sulfonic acid (AMPS), acrylamido methanesulfonic acid, acrylamido ethanesulfonic acid, 2-hydroxy-3-acrylamide propane sulfonic acid, styrene sulfonic acid, vinyl benzene sulfonic acid, vinyl phosphonic acid, and alkali metal salts, alkaline earth metal salts, and ammonium salts thereof.
  • APMS 2-acrylamido-2-methylpropane sulfonic acid
  • Anionic monomers can be combined for example to form a terpolymer of acrylamide , acrylic acid and 2-acrylamido-2-methylpropane sulfonic acid (AMPS).
  • one or more acrylamide (co)polymers may comprise at least one monoethylenically unsaturated monomer comprising acid groups, for example monomers that comprise at least one group selected from -COOH, SO3H, or -PO3H2.
  • Examples of such monomers may include , but are not limited to, acrylic acid, methacrylic acid, vinyl sulfonic acid, allyl sulfonic acid or 2-acrylamido -2-methylpropane sulfonic acid, particularly preferably acrylic acid and/or 2- acrylamido-2-methylpropane sulfonic acid, and most preferred acrylic acid or the salts thereof.
  • one or more acrylamide (co)polymers, or each of the one or more acrylamide (co)polymers may comprise acrylic acid and/or 2-acrylamido-2-methylpropanesulfonic acid or salts thereof.
  • reactive cationic polymers refers to polymers that contain reactive moieties (e.g., azetidinium rings, aldehydes, hemiacetals, and the like), which react with carboxylate and -OH moieties on cellulosic and lignocellulosic fibers to form covalent bonds.
  • exemplary reactive cationic polymers including but not limited to, cationic glyoxalated polyacrylamides (GPAMs) and cationic polyamidoamine-epichlorohydrin (PAE) resins are typically used as wet and/or dry strength additives in papermaking.
  • GPAMs and PAE resins are used in combination with amphoteric emulsion and dry polyacrylamides as retention and drainage aids.
  • GPAMs cationic glyoxalated polyacrylamides
  • GPAM generally refers to a polymer obtained by reacting glyoxal and a polyacrylamide base polymer.
  • Methods for producing glyoxalated polyacrylamides are known in the art. (See e.g., U.S. Pat. No. 3,556,932 which first disclosed the synthesis of a GPAM composition prepared by reacting glyoxal with a cationic polyacrylamide).
  • the polyacrylamide backbone of the GPAM can incorporate a small amount of a cationic monomer, rendering the polymer self-retaining on fibers.
  • GPAM comprises a reactive polymer that can covalently bind with cellulose upon dehydration. L7 Arrv Docrer No. I 149704.062013 C LIENT RNP NO.
  • cationic glyoxalated polyacrylamides refers to an aldehyde containing polymer, preferably cationic glyoxalated polyacrylamide ("GPAM") suitable for use as a dry and/or wet strengthening agent, wherein said cationic GPAM comprises: A.) a base polymer comprising a cationic monomer, optionally wherein the cationic monomer comprises DADMAC and/or acryloyloxyethyltrimethyl ammonium chloride ; B.) the base polymer comprises a weight average molecular weight of at least 5,000 Da, preferably at least 80,000 Da, more preferably 100- L000 kDa; C.) the cationic GPAM comprises a glyoxal:base polymer weight ratio of at least about 5:95, optionally from about 10:90; and D.) the GPAM optionally comprises a solids percentage of from about OS% to about
  • said one or more cationic monomers may comprise DADMAC. ln some embodiments, said one or more cationic monomers may comprise acryloyloxyethyltrimethyl ammonium chloride. ln some embodiments, said one or more cationic monomers may comprise DADMAC and/or acryloyloxyethyltrimethyl ammonium chloride.
  • said one or more cationic monomers may be selected from the group consisting of methacryloyloxyethyltrimethyl ammonium chloride, acryloyloxyethyltrimethyl ammonium chloride, 3- (methacrylamido) propyltrimethyl ammonium chloride, 3-(acryloylamido) propyltrimethyl ammonium chloride, diallyldimethyl ammonium chloride, dimethylaminoethyl acrylate, dimethylaminoethyl methacrylate, and dimethylaminopropylacrylamide, dimethyla minopropylmethacrylamide.
  • the backbone polymer may comprise one or more primary amide- containing monomers.
  • the backbone polymer may comprise one or more monomers selected from the group consisting of acrylamide, methacrylamide, ethylacrylamide, crotonamide, N-methylacrylamide, N-butylacrylamide, N-ethyl methacrylamide, and any ArrY DocKEr No. I 149704.062013 C LIENT RNP NO. U52324 combination thereof.
  • the backbone polymer may comprise one or more acrylamide monomers.
  • lOI77l ln the backbone polymer may comprise one or more anionic monomers.
  • the anionic monomers are selected from the group consisting of monomers containing a carboxylic acid functional group, a sulfonic acid functional group, phosphonic acid functional group, their corresponding water soluble or dispersible salts, and any combinations thereof; preferably the anionic monomers are selected from the group consisting of acrylic acid, methacrylic acid, maleic acid, itaconic acid, vinyl sulfonic acid, 2-acrylamido-2-methylpropane sulfonic acid (AMPS), acrylamido methane sulfonic acid, acrylamido ethane sulfonic acid, 2-hydroxy-3-acrylamide propane sulfonic acid, styrene sulfonic acid, vinyl benzene sulfonic acid, and vinyl phosphonic acid, their corresponding water soluble or dispersible alkali metal, alkaline earth metal, and ammonium salts, and any combinations thereof; more preferably the anionic monomers are selected from acrylic acid, its water soluble or
  • the term “glyoxylation percentage” refers to the percentage of acrylamide- based monomers which are glyoxalated in a polymer of the cationic GPAM composition, e.g., the first base polymer and/or the second base polymer.
  • the terms "cationic polyamidoamine-epichlorohydrin (PAE) resins' , “PAE resin”, or “PAE” generally refer to reactive cationic polymers generally synthesized by reacting one or more polyamidoamine backbones comprising an acid value of between about 35 to about 40 with epichlorohydrin.
  • the molar ratio of epichlorohydrin: secondary amine groups of the polyamidoamine backbone may be between about 0.L5 to about t.7.ln some embodiments, said method may comprise a low-temperature hold time of less than 24 hours under a 30-35"C temperature range at the beginning of the synthesis reaction.
  • said method may include the addition of a strong acid and a weak acid.
  • said method may comprise the addition of a weight ratio of weak acid: strong acid of about 0.25 or more, 1.2 or more, 1.6 or more, e.g., wherein said strong acid comprises sulfuric acid and/or said weak acid comprises formic acid.
  • said method may further comprise sequential addition of formic acid and sulfuric acid. ln some embodiments, said method may comprise one or more additions of formic acid and/or one or more additions of sulfuric acid. ln some embodiments, said method may result in a stable PAE resin comprising a solids percentage ranging about L0-30%,20-27% or about 25%.ln some embodiments, said method may result in a stable PAE resin comprising final resin pH of about 2.5 to about 3.8.
  • said stable PAE resin may comprise about 10,500 ppm or more, about 10,500 ppm or less, about 5,000 ppm or less, about L,000 ppm or less of epichlorohydrin byproducts following synthesis of said stable PAE resin.
  • PAE resins t01S0l polyamidoamine epichlorohydrin resins
  • PAE resins have been applied in the manufacture of paper for a variety of applications.
  • PAE resins are widely used as strength additives to increase the paper wet strength.
  • PAE resins are also the most common adhesives used in the creping process for producing tissue and towel products. Conventional PAE resins are typically produced in a two-step reaction.
  • a polyamidoamine is prepared by condensation of near equimolar amounts of a polyamine and a polycarboxylic acid or polycarboxylic acid derivative.
  • the polyamidoamine that is formed is then reacted with epichlorohydrin in an aqueous solution to produce the PAE resin.
  • the detailed synthesis is well known and is documented in numerous patents, e.g., US Pat. Nos., 2,926,1L6, and7,175,740' L9 ArrY DocKEr No. I 149704.062013 C LIENT REFNO.
  • water-soluble amphoteric polymers or “water-soluble amphoteric terpolymers” generally refers to polymers comprised of acrylamide (AM) monomers, one or more anionic monomers, and one or more cationic monomers. Such polymers may be utilized in the inventive retention and drainage aids as amphoteric dry polymers (AmDPAM). Exemplary water- soluble amphoteric dry terpolymers (AmDPAM) are documented in EP325075281'. Water-soluble amphoteric polymers may also be utilized in the inventive retention and drainage aids as amphoteric emulsion polymers (AmEPAM).
  • AM amphoteric dry polymers
  • AmDPAM water-soluble amphoteric dry terpolymers
  • AmEPAM amphoteric emulsion polymers
  • Exemplary water-soluble amphoteric polymers comprise one or more anionic monomers containing functional groups selected from the group consisting of carboxylic acids, sulfonic acids, phosphonic acids, their corresponding water soluble salts, their corresponding water dispersible salts, and any combination thereof, including but not limited to, acrylic acid, methacrylic acid, maleic acid, itaconic acid, vinyl sulfonic acid, 2-acrylamido-2-methylpropane sulfonic acid (AMPS), acrylamido methanesulfonic acid, acrylamido ethanesulfonic acid, 2-hydroxy-3-acrylamide propane sulfonic acid, styrene sulfonic acid, vinyl benzene sulfonic acid, and vinyl phosphonic acid, their corresponding alkali metal, alkaline earth metal, and ammonium salts, and any combination thereof' to183l
  • Exemplary water-soluble amphoteric polymers comprise one or more cationic monomers selected from
  • t01841 preferred embodiments of water-soluble amphoteric polymers are synthesized from three different monomers, i.e., acrylamide (AM) (nonionic), acrylic acid (AA) (anionic at higher pH levels), Q9 (cationic).
  • inventive emulsion amphoteric polymers are synthesized by inverse emulsion; comprise an acrylic acid anionic monomer content ⁇ 2wl% and up to 20 wt%o Q9, > 78 wt% acrylamide (AM) monomers; in more preferred exemplary embodiments comprise the following composition: AM: AA: Q9- 89:2:9; possess a low SV value ( ⁇ 3.5 cPs) or ArrY DocKEr No.
  • anionic microparticles As used herein, the terms "anionic microparticles", “anionic organic or inOrganic microparticles”, or “anionic additives” generally refers to anionic materials added to papermaking furnish as part of drainage-aid programs.
  • Exemplary anionic organic or inorganic microparticles are selected from the group of microparticles and nanoparticles consisting of silica microparticles; colloidal silica; aluminum phyllosilicate mineral particles, including but not limited to bentonite, sodium bentonite, calcium bentonite, and montmorillonite; and anionic polymer microparticles, including but not limited to highly structured anionic polyacrylamides.
  • Preferred anionic organic or inorganic microparticles may include silica or colloidal silica.
  • colloidal silica appears to involve (a) release of water from polyelectrolyte bridges, causing them to contract, and (b) acting as a link in bridges that involve macromolecules adsorbed on different fibers or fine particles. These effects create more streamlined paths for water to flow around the fibers. The tendency of microparticles to boost first-pass retention also will tend to have a positive effect on initial dewatering rates.
  • aqueous solution or “solution” generally refers to a mixture of water and a water-soluble solute or solutes which are completely dissolved with little to no residual undissolved polymer gel.
  • the solution may be homogenous.
  • the polymer product is preferably fully dissolved and the obtained polymer solution is preferably free from discrete polymer particles or granules or residual gel.
  • the term “aqUeOuS SUSpenSiOn”, “aqUeOuS SlUrry”, Or “Slurry” generally refer to a heterogeneous mixture of a fluid that contains insoluble or sparingly soluble solid particles sufficiently large for sedimentation. Suspensions and slurries of the present invention may also comprise some amount of solid particles, often termed colloidal particles, which do not completely settle or take a long time to settle completely. t018g] As used herein, the term “consistency” generally refers to percent oven dry mass in the stock, slurry, or furnish (i.e.,700% * oven dry mass/total mass).
  • total solids or “total suspended solids” are used interchangeably herein and generally refer the total amount or weight of suspended solids contained in oil sands or other sands comprising dispersion. "Total solids” or “total suspended solids” generally does not include dissolved solids. tolg1l As used herein, the term “ppm” refers to parts per million on the basis of milligrams of solute per liter of aqueous solution or slurry (e.g., mg/L).
  • lbs/ton or "#ff” denote pounds of dry mass of added material (e.g., additive, solute, and/or particle) per ton of suspended solids (e.g., weight of AKD per total dry ton of suspended solids).
  • t0193 As used herein, the terms “kE/T” or “kgflon” denote kilograms of dry mass (additive, solute, and/or particle) per ton of slurry, stock, and/or furnish.
  • t6194l As used herein, the phrases “%o by wt.” denotes pounds of dry mass of additive per dry mass of solids in the formulation, solution, or slurry, multiplied by LOO%.
  • GPAM is typically prepared through the reaction between glyoxaland a cationic polyacrylamide base polymer.
  • the original GPAM was reported in US Pat. No.3556932.
  • the cationic polyacrylamide base polymer has a molecular weight below 25,OOO Da and a molar ratio of acrylamide to diallyldimethyl ammonium chloride of 99:L to 75:1. l ⁇ tgTl
  • US. patents No. 8222303, No. 8703847, No. 9644320 claim new GPAM products prepared using a cationic polyacrylamide with an average molecule weight ranging from 30 kDa to 5 million Da.
  • the final GPAM product had a GPAM content below 4%.
  • t01g8l Polyamidoamine-epichlorohydrin (PAE) is the predominant chemicalto provide wet strength for paper products. lt is commonly used for paper towel, labels, and carrier board grade to provide strength while the paper products are wet.
  • US Patents No. 2926L54 and29261'16 describe the synthesis of PAE samples. t01991 More recently an amphoteric polymer was designed to improve the runnability of the paper machine.
  • US patent 10,590,604 82 claim a new amphoteric polymer with a mass average molecular weight MW of 1500000-6 000 OO0 g/mol, and a total ionicity of 4-1-5 mol-To, whereby the polymer product has a polymer content of at least 60 wt%. Even more recently an emulsion amphoteric polymer is reported (patent application number: Docket No.: 1149704.048000)to improve drainage and retention of a papermaking system. tO2OOl
  • the present invention generally relates to methods and compositions for manufacture of tissue, paper, or board and for enhancing retention and drainage thereof.
  • the disclosure provides methods for enhancing retention and drainage by addition of a retention and drainage aid comprising reactive cationic polymers (e.g., cationic strength resins), water-soluble amphoteric terpolymers, and optionally anionic organic or inorganic microparticles.
  • a retention and drainage aid comprising reactive cationic polymers (e.g., cationic strength resins), water-soluble amphoteric terpolymers, and optionally anionic organic or inorganic microparticles.
  • the present invention provides a method for manufacture of tissue, paper, or board, the method comprising: tOZO2l (a)forming or providing an aqueous suspension comprising cellulosic fibers; [0203] (b) optionally diluting the aqueous suspension; t6204l (c) flocculating the aqueous suspension to form a flocculated fiber suspension; t02051 (d) delivering the flocculated fiber suspension to a headbox and draining on a wire screen to form a wet fibrous web; and t02o6l (e) pressing and drying the wet fibrous web to obtain a tissue, paper, or board; ArrY DocKEr No.
  • step (c) treating the aqueous suspension comprising cellulosic fibers with a retention and drainage aid comprising: [0208] (i) one or more reactive cationic polymers; and [0209] (ii)one or more water-soluble amphoteric polymers.
  • a retention and drainage aid comprising: [0208] (i) one or more reactive cationic polymers; and [0209] (ii)one or more water-soluble amphoteric polymers.
  • said retention and drainage aid optionally further comprises one or more anionic organic or inorganic microparticles.
  • t02111 ln some exemplary embodiments of the method (i)said one or more reactive cationic polymers, (ii) said one or more water-soluble amphoteric polymers, and optionally (iii) said one or more anionic organic or inorganic microparticles: lO2I2l (a) are added sequentially in any order, simultaneously, or premixed prior to addition; or tO213l (b) are added sequentially in the order of (i), (ii), and then optionally (iii), wherein a mixing time is allowed after each addition and said mixing time ranges from 0.01-10 min, 0.1-5 min, or L-2 min.
  • said one or more reactive cationic polymers comprise: tO215l (a) functional groups that are reactive to cellulosic or lignocellulosic fiber surfaces; and t02161 (b) a cationic charge density ranging from below 5.0 mEq/g, 0.5-5.0 mEq/$,1.0-4.0 mEq/g, or 1.5-2.5 mEq/e as dry solids at PH 7; l ⁇ 217l and further comprise one of the following; t02181 (c) one or more cationic glyoxalated polyacrylamides (GPAMs); t02L91 (d) one or more cationic polyamidoamine-epichlorohydrin (PAE) resins; or lO2ZOl (e) a combination of one or more cationic GPAMs and one or more cationic PAE resins having a ratio of PAE to GPAM ranging
  • tO2ZIl ln some exemplary embodiments of the method said one or more cationic GPAMs: t1222l (a) are suitable for use as a dry and/or wet strengthening agen! l ⁇ 223l (b) are synthesized by reacting glyoxalwith a base polymer, wherein said base polymer comprises a weight average molecular weight ranging from 5-5000 kDa, 50-2500 kDa, 80-2000 kDa, or 100-1000 kDa and comprises nonionic monomers, cationic monomers, and optional anionic monomers, wherein lOZZ4l (i) said nonionic monomers are selected from the group of primary amide-containing monomers comprising acrylamide, methacrylamide, ethyl acrylamide, crotonamide, N-methyl acrylamide, N-butyl acrylamide, N-ethyl methacrylamide, and any combination thereof; lOZ2Sl (ii
  • dialkylaminoalkyl methacrylates and their quaternary or acid salts including but not limited to, dimethylaminoethyl acrylate ("DMAEA"), dimethylaminoethyl methacrylate (“DMAEA”), dimethylaminoethyl acrylate methyl chloride quaternary salt, dimethylaminoethyl acrylate methyl sulfate quaternary salt, dimethylaminoethyl acrylate benzyl chloride quaternary salt, dimethylaminoethyl acrylate sulfuric acid salt, dimethylaminoethyl acrylate hydrochloric acid salt, diethylaminoethyl acrylate methyl chloride quaternary salt, dimethylaminoethyl methacrylate methyl chloride quaternary salt, dimethylaminoethyl methacrylate methyl sulf
  • U52324 102341 (c) comprise a molar ratio of epichlorohydrin to secondary amine groups of the polyamidoamine backbone ranging from about 0'15 to about L.7' t6235l ln some exemplary embodiments of the method said one or more water-soluble amphoteric polymers: t02361 (a) are comprised of acrylamide (AM) monomers, one or more anionic monomers, and one or more cationic monomers, wherein, lOZ37l(i) said one or more anionic monomers contain functional groups selected from the group consisting of carboxylic acids, sulfonic acids, phosphonic acids, their corresponding water soluble salts, their corresponding water dispersible salts, and any combination thereof, including but not limited to, acrylic acid, methacrylic acid, maleic acid, itaconic acid, vinyl sulfonic acid, 2-acrylamido- 2-methylpropane sulfonic acid
  • U52324 t1242l (e) comprise an acrylamide (AM) monomer content ranging from 77-100 wt%o,78-LOOwl%, 80-100 wt%, 90-100 wt%o, or 95-100 wt%; [0243] (f)comprise an anionic monomer content ranging from (3 wtYo, 42 wt%,0.01-3 wt%,0.5-2 wt%o, 1--2 wtyo, L.5-2 wt%o, or 1',8-2 wl%; t1244l (g)comprise a cationic monomer content ranging from (20 wt%o,L-2OwtYo,2-16w
  • AM acrylamide
  • anionic monomer content ranging from (3 wtYo, 42 wt%,0.01-3 wt
  • said one or more anionic organic or inorganic microparticles are selected from the group of microparticles and nanoparticles consisting of silica microparticles; colloidal silica; aluminum phyllosilicate mineral particles, including but not limited to bentonite, sodium bentonite, calcium bentonite, and montmorillonite; and anionic polymer microparticles, including but not limited to highly structured anionic polyacrylamides.
  • said one or more reactive cationic polymers comprises said one or more cationic GPAMs and/or said one or more cationic PAE resins in aqueous form; l124gl (b) said one or more cationic GPAMs comprise said base polymer comprising cationic monomers selected from DADMAC, AETAC, and combinations thereof; nonionic monomers selected from acrylamide, methacrylamide, and combinations thereof; and optionally anionic monomers selected from acrylic acid and/or corresponding water soluble salts, water dispersible alkali metal salts, alkaline earth metal salts, ammonium salts, and combinations thereof, or said base polymer comprises (i) acrylamide and DADMAC, (ii) acrylamide and AETAC, or (iii) acrylamide, DADMAC, and AETAC, [0250] (c) said one or more water-soluble amphoteric polymers tQ25
  • said aqueous suspension comprising cellulosic fibers comprises a pH ranging from 4-8, 4-7 .5, 4-7 , 4.5-7 , or 5-7 and further comprises: ArrY DocKEr No. 1149704.062013 C LIENT REr NO.
  • U52324 t0260l (a)cellulosic fibers optionally obtained from sources selected from softwood fiber, hardwood fiber, recycled fiber, recycled old corrugated cardboard (OCC), recycled mixed office waste (MOW), recycled mixed office paper, refined fiber, mill broke fibers, coated broke, non-wood fibers, including but not limited to straw and wheat pulp, and a mixture of any of the foregoing; t9261l (b) pulp selected from Kraft pulp, unbleached Kraft pulp, bleached pulp, unbleached pulp, process water from pulp, paper, andf or board production, neutral sulfite semi chemical (NSSC) pulp, mechanical pulp, non-wood pulp, and a mixture of any of the foregoing; or 10262l (c) a stock selected from a thick stock, a thick stock diluted with chemical water, synthetic water, white water, andf or process water, and a thin stock, and a mixture of any of the foregoing.
  • NSC neutral sulfite semi chemical
  • ln some exemplary embodiments of the method when used for manufacture of tissue, paper, or board, the method results in: [02641(a) improved retention of said cellulosic fibers; a [0265] (b) improved drainage of said flocculated fiber suspension; [0265] (c) improved STFI and/or burst strength; 10267l (d)a reduced hydrophobic particle and/or hydrophobic agglomerate counU tO26Sl (e) an improved dry tensile, immediate wet tensile, and/or soaked wet tensile strength; or [0269] (f) any combination of (a)-(e) lO27Ol compared to a tissue, paper, or board prepared by an identical method in the absence of (i) addition of said one or more reactive cationic polymers or (ii) addition of said one or more water- soluble amphoteric polymers.
  • the present invention provides a method for manufacture of tissue, paper, or board, the method comprising: lo272l (a) forming or providing an aqueous suspension comprising cellulosic fibers; l ⁇ 273l (b) optionally diluting the aqueous suspension; lO274l (c) flocculating the aqueous suspension to form a flocculated fiber suspension; l1275l (d) delivering the flocculated fiber suspension to a headbox and draining on a wire screen to form a wet fibrous web; and 10276l (e) pressing and drying the wet fibrous web to obtain a tissue, paper, or board; lo277l wherein the method further comprises prior to step (c) treating the aqueous suspension comprising cellulosic fibers with a retention and drainage aid comprising: l1278l (i) one or more reactive cationic polymers comprising functional groups that are reactive to cellulosic or lig
  • the present invention provides a fiber stock composition
  • a fiber stock composition comprising: l1282l (a) an aqueous suspension comprising cellulosic fibers; and [02831 (b) a retention and drainage aid comprising [0234] (i) one or more reactive cationic polymers; [0285] (ii) one or more water-soluble amphoteric polymers; and tO2S6l (iii) optionally one or more anionic organic or inorganic microparticles; l1287l obtainable by a method according to any of the foregoing claims.
  • the present invention provides a composition for use as a retention and drainage aid in manufacture of tissue, paper, or board, the composition comprising: t62Sgl (a) one or more reactive cationic polymers comprising a cationic charge density ranging from below 5.0 mEq/g,0.5-5.0 mEq/g,1.0-4.0 mEq/g, or 1.5-2.5 mEq/g as dry solids at pH 7, wherein said one or more reactive cationic polymers comprise tO29Ol (i) one or more cationic glyoxalated polyacrylamides (GPAMs) synthesized by reacting glyoxal with a base polymer, wherein said base polymer comprises a weight average molecular weight ranging from 5-5000 kDa, 50-2500 kDa, 80-2000 kDa, or L00-1000 kDa; (i) acrylamide and DADMAC, (ii) acrylamide and AETAC
  • Drainage time was determined by measuring the time needed to show a vacuum break (i.e., a rapid increase in vacuum pressure).
  • the fiber mat left on the DDA screen and the filtrate were used for additional testing.
  • [03001 Determination of filtrate turbidity tO3O1l Turbidity testing was performed on the filtrates from DDA screening as an indication of retention. Turbidity of treated filtrates was performed using a Hach 2100Q turbidimeter.
  • the Model 2100Q Portable Turbidimeter operates on the nephelometric principle of turbidity measurement.
  • the optical system includes a tungsten-filament lamp, a 90" detector to monitor scattered light and a transmitted light detector.
  • the instrument's microprocessor calculates the ratio of the signals from the 90' and transmitted light detectors, which corrects for interferences from color and/or light- absorbing materials.
  • the instrument range is 0 to 1000 NTU.
  • a lower turbidity level generally trends with an increase in retention of filler, fines, and/or contaminants in the furnish in the fiber mat.
  • E xample 1 Evaluation of amphoteric emulsion polymers with reactive strength resins and s ilica as retention and drainage aids in recycled OCC furnish [0302] Amphoteric emulsion terpolymers with reactive strength resins were evaluated with and without silica as retention and drainage aids for L00% recycled old corrugated cardboard (OCC) stock. Retention and drainage aid additives are shown in Table 1.
  • a lower turbidity level generally trends with an increase in retention of filler, fines, and/or contaminants in the furnish in the fiber mat.
  • to311l Additives, dosages, and retention and drainage results are shown in FIGS 1-4. t03121 The results indicate that the inventive retention and drainage aids (e.g., reactive strength resin with amphoteric emulsion terpolymer) significantly improve the drainage and retention (i.e., shorter drainage time and lower turbidity) of sheets prepared from a 1-00% recycled furnish over GpAM or PAE alone.
  • the inventive retention and drainage aids improve both drainage and turbidity in a dose dependent manner as the AmEPAM polymer dosage increased.
  • E xample 2 Evaluation of AmEPAM and AmDPAM with reactive strength resins and silica as r etention and drainage aids in recycled MOW furnish tO315l
  • Amphoteric emulsion terpolymers and amphoteric dry polymers were evaluated with reactive strength resin (PAE), with and without silica or ANMicro, as retention and drainage aids for recycled mixed office waste (MOW) furnish.
  • PAE reactive strength resin
  • MOW mixed office waste
  • the inventive retention and drainage aids were evaluated against chemical additives (polyamines and CPAMs) that are known for their performance on wet pulp pressability. Retention and drainage aid additives are shown in Table 1.
  • tO316l A NA Tissue machine was used for formation of recycled white towels using the recycled MOW cellulosic fiber stock.
  • t03171 Towel fiber mats were prepared and evaluated for drainage time by DDA screening and the resulting filtrates were evaluated for turbidity according to Example 1. An aliquot of cellulosic stock (5OO mL) was combined with reactive strength resin (PAE) or control resin (CPAM2) and mixed for up to 2 minutes, followed by addition of amphoteric polymeric additive (AmEPAM or AmDPAM) or control polymer (CPAM1 or Polyamine).
  • PAE reactive strength resin
  • CPAM2 control resin
  • AmEPAM or AmDPAM amphoteric polymeric additive
  • CPAM1 or Polyamine control polymer
  • anionic additive sica or ANMicro
  • HP hydrophobic particle
  • HP agglomerate count were determined.
  • tO318l Conditions, dosages, and results are summarized in Table 2.
  • Table 2 Additives and results for recycled towels HP Polymer Resin Anionic Drain Filtrate 3t ArrY DocKEr No. I149704,062013 C LIENT REF NO. U52324 CPAMl t none 0 Silica 0.5 24.58 71.3 44.t% 58.Oo/o A A A A A A A A tO po . ., lower turbidity) of a recycled MOW furnish over commonly used additives (CPAM1 or polyamine) and an anionic additive.
  • CPAM1 or polyamine commonly used additives
  • an anionic additive e.g., silica or ANMicro
  • an anionic additive e.g., silica or ANMicro
  • tO321l Results also indicate that both amphoteric emulsion polymers (AmEPAM) and amphoteric dry polymers (AmDPAM) significantly improve the drainage and retention when used with PAE or a cationic polyacrylamide (CPAM2) and an anionic additive.
  • CPAM2 a cationic polyacrylamide
  • Amphoteric emulsion terpolymers (AmEPAM)+ GPAM were evaluated against a cationic polyacrylamide (CPAM) + GPAM as retention and drainage aid along with common additives (e'g', rosin and alum) in a commercial packaging grade furnish at different conductivity levels.
  • CPAM cationic polyacrylamide
  • GPAM cationic polyacrylamide
  • common additives e'g', rosin and alum
  • TSS total suspended solids
  • the resulting thin stock furnish had the following characteristics: pH 6.02, conductivity 3.84 gS/cm, alkalinity 32O mg/L as CaCOa and total hardness 800 mg/L as CaCOs.
  • a portion of the stock was also treated with a L0% CaClz solution and a IO% Na2SO4 solution to increase the conductivity of the system.
  • Total conductivity was measured at three distinct levels: 3.84 mS/cm, 5.09 mS/cm and 8.01 mS/cm.
  • t03261 A commercial chemical additive sequence and dosage was followed, with the polymer being the independent variable.
  • the sequence was comprised of 1.5 kg/ton GPAM, 0.1 kg/ton rosin, 5 kg/ton alum, and polymer, where the polymer was either a cationic polyacrylamide (CPAM) or the inventive amphoteric polyacrylamide (AmEPAM) at dosages ranging from 0.L-0.3 kg/T.
  • CPAM cationic polyacrylamide
  • AmEPAM inventive amphoteric polyacrylamide
  • Arrv DocnEr No. 1149704.062013 C LIENT REF NO. U52324 l1327l
  • Conditions, dosages, and drainage time results for two conductivity levels are shown in FIGS 5-6.
  • Conditions, dosages, and filtrate turbidity results for three conductivity levels are shown in FIG 7.
  • Results from FIG 5 indicate that packaging grade furnish at conductivity 3.84 mS/cm, when treated with AmEPAM provides significantly better drainage time than the CPAM.
  • Results from FIG 6 indicate that AmEPAM continues to outperform the CPAM as a drainage aid for packaging grade furnish at conductivity 5.09 mS/cm.
  • Results from FIG 7 indicate that AmEPAM outperforms CPAM in filtrate turbidity test results across all three conductivity levels at all dosages. [0329]
  • E xample 4 Evaluation of strength of packaging liner sheets made with AmEPAM vs. AmDPAM with GPAM t03301 NA packaging liner sheets were prepared using amphoteric emulsion terpolymers (AmEPAM) or amphoteric dry polymers (AmDPAM) across several GPAM dosages (1.5-4.5 kg/T) according to Example 3. The resulting sheets were evaluated using a standard strength test, e.9., Short Span Compressive Test (STFI). Geometric mean STFI results are shown in FIG 8. t03311 These results indicate that, when used with GPAM, both AmEPAM and AmDPAM provide a strength benefit over GPAM alone.
  • AmEPAM amphoteric emulsion terpolymers
  • AmDPAM amphoteric dry polymers
  • Example 5 Evaluation of strength of handsheets made with AmEPAM vs. CPAM with GPAM a nd silica as retention and drainage aids in recycled OCC furnish to332l NA Handsheets were prepared using retention and drainage aids consisting of amphoteric emulsion terpolymers (AmEPAM) + GPAM + silica or cationic polyacrylamide (CPAM) + GPAM + silica according to Example 1. to333l This example used L00% recycled OCC. Thick stock was collected from the machine chest prior to the introduction of any papermaking additives.
  • TSS total suspended solids
  • the resulting thin stock furnish had the following characteristics: pH 6.3, conductivity 2.9 mS/cm, alkalinity 300 mg/L as CaCOg and total hardness 900 mg/L as CaCO:.
  • t03341 GPAM was added at 4 kg/ton.
  • AmEPAM or CPAM was added at 0.125 kg/ton as active polymer.
  • Silica was added at 0.125 kg/ton.
  • NA Handsheets were prepared and tested for strength using standard STFI and burst strength tests. STFI and burst strength results are shown in FIG 9.
  • silica provides additional synergistic enhancement to the retention and drainage aids.
  • GPAM reactive strength resins
  • PAE reactive strength resins
  • the simultaneous presence of the amphoteric PAM which is a terpolymer containing anionic and cationic monomers (see Table 1), causes flocculation to occur and allows for the reactive strength resin to react with the anionic monomers of the amphoteric terpolymer, thereby forming large and stable flocs comprising fiber, fines, amphoteric PAM, and strength resin, and causing a synergistic increase in retention and drainage
  • the optional addition of silica causes the flocs to shrink by collapsing bonds between strength resin and poly

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Abstract

La présente divulgation concerne de manière générale des procédés et des compositions servant à fabriquer du tissu, du papier ou du carton et à améliorer la rétention et le drainage de ceux-ci. En particulier, la divulgation concerne des procédés permettant d'améliorer la rétention et le drainage par ajout d'un auxiliaire de rétention et de drainage contenant des polymères cationiques réactifs (par exemple, des résines résistantes cationiques), des terpolymères amphotères hydrosolubles, et éventuellement des microparticules organiques ou inorganiques anioniques. La préparation de feuilles de papier dans ces conditions permet d'améliorer la rétention, le temps de drainage, la STFI, la résistance à l'éclatement, et la régulation de particules hydrophobes.
PCT/US2024/035812 2023-06-28 2024-06-27 Utilisation de polymères en émulsion amphotères avec des résines résistantes en tant qu'auxiliaires de rétention et de drainage WO2025006743A2 (fr)

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US63/510,759 2023-06-28
FI20236130 2023-10-12
FI20236130 2023-10-12

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