EP3030716A2 - Polyethylene oxide treatment for drainage agents and dry strength agents - Google Patents

Polyethylene oxide treatment for drainage agents and dry strength agents

Info

Publication number
EP3030716A2
EP3030716A2 EP14843177.8A EP14843177A EP3030716A2 EP 3030716 A2 EP3030716 A2 EP 3030716A2 EP 14843177 A EP14843177 A EP 14843177A EP 3030716 A2 EP3030716 A2 EP 3030716A2
Authority
EP
European Patent Office
Prior art keywords
acid
polymer
furnish
peo
synthetic polymer
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.)
Withdrawn
Application number
EP14843177.8A
Other languages
German (de)
French (fr)
Inventor
John C. Harrington
Lance P. PERTICONE
Kane D. SHELDON
Bryan K. Spraul
Richard M. VERBRUGGE
Iris D. BARTON
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.)
Solenis Technologies LP Switzerland
Original Assignee
Solenis Technologies LP Switzerland
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 Solenis Technologies LP Switzerland filed Critical Solenis Technologies LP Switzerland
Publication of EP3030716A2 publication Critical patent/EP3030716A2/en
Withdrawn legal-status Critical Current

Links

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
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/37—Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
    • D21H17/375—Poly(meth)acrylamide
    • 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
    • D21H17/20—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
    • D21H17/44—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups cationic
    • D21H17/45—Nitrogen-containing groups
    • 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
    • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/53—Polyethers; Polyesters
    • 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
    • D21H21/06—Paper forming aids
    • D21H21/10—Retention agents or drainage improvers
    • 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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/04—Addition to the pulp; After-treatment of added substances in the pulp

Definitions

  • Paper and paperboard are produced from an aqueous slurry of cellulosic fiber, depositing this slurry on a moving papermaking wire or fabric, and forming a sheet from the solid components of the slurry by draining the water. This sequence is followed by pressing and drying the sheet to further remove water.
  • Drainage or dewatering of the fibrous slurry on the papermaking wire or fabric is often the limiting step in achieving faster paper machine speeds. Improved dewatering can also result in a drier sheet in the press and dryer sections, resulting in reduced energy consumption.
  • Chemicals are often added to the fibrous slurry before it reaches the papermaking wire or fabric to improve drainage/dewatering and solids retention; these chemicals are called retention and/or drainage aids.
  • Retention and drainage aids have reduced efficacy in some furnish substrates which contain high levels of soluble organics and salts.
  • Two such examples of these furnishes are neutral sulfite semi chemical (NSSC) and kraft virgin linerboard, where high levels of soluble lignin and other organic materials containing a high anionic charge are present. These highly anionic materials neutralize the chai'ge on the conventional retention and drainage aids, significantly reducing their effectiveness.
  • Molecular weights are viscosity average molecular weight as determined from intrinsic viscosity determinations.
  • the PEO can be a homo-polymer of ethylene oxide, or a copolymer of ethylene oxide.
  • Suitable comonomers include propylene oxide or butylene oxide.
  • a homopolymer of polyethylene oxide is the most preferred.
  • Additional suitable comonomers used to make the PEO copolymer can be cationic, anionic, non-ionic or hydrophobic monomers, and any mixture thereof.
  • the molecular weight of the PEO homo-polymer or co-polymer can range from 1000 daltons up to 25,000,000 daltons or 100,000 to 15,000,000 daltons or 1,000,000 to 10,000,000 daltons.
  • Examples of ethylene oxide containing homo polymers or copolymers are UcarflocTM 300, 302, 304, and 309 (available from Dow Chemical, Midland, Ml).
  • the feed point of the PEO treatment can include the thick stock, thin stock, white water, or process water.
  • the PEO treatment can be added at the blend chest, machine chest, fan pump, cleaners, centriscreen, save-all, white water tray and white water silo.
  • the drainage or strength agents which will function due to the PEO treatment, are generally water-soluble or water-dispersible synthetic polymers, "synthetic polymer".
  • the synthetic polymers can be nonionic polymers, cationic copolymers or anionic copolymers.
  • nonionic monomers used are acrylamide; methacrylamide, N- vinylformamide.
  • the cationic monomers used to make the synthetic polymer include, but are not limited to, cationic ethylenically unsaturated monomers such as the diallyldialkylammonium halides, such as diallyldimethylammonium chloride; the (meth)acrylates of
  • diethylaminoethyl (meth) acrylate dimethyl aminopropyl (meth)acrylate, 2-hydroxydimethyl aminopropyl (meth) acrylate, aminoethyl (meth)acrylate, and the salts and quaternaries thereof; the N,N-dialkylaminoaIkyj(meth)acrylamides, such as N,N- dimethylaminoethylacrylamide, and the salt and quaternaries thereof and mixtures of the foregoing.
  • More than one kind of non-ionic monomer can be used to make the synthetic polymer. Most preferred are diallyldimethylammonium chloride and dimethylaminoethyl (meth) acrylate and the salt and quaternaries thereof and mixtures of the foregoing.
  • Poly(vinylamine) is also a suitable cationic synthetic polymer for the invention.
  • the polyvinyl amine can be a homopolymer or a copolymer.
  • One method of producing a polyvinylamine polymer is by polymerization of the monomer(s) followed by hydrolysis.
  • the level of hydrolysis can be expressed as"% hydrolysis” or "hydrolysis%" on a molar basis.
  • a hydrolyzed polymer can thus be described by as "% hydrolyzed.”
  • a poly(vinylamine) that is referred to as "50% hydrolyzed” means from 40% to 60% hydrolyzed.
  • a poly(vinylamine) that is about 100% hydrolyzed means from 80% to 100% hydrolyzed.
  • the hydrolysis reaction results in the conversion of some or all of the monomer(s) to amines, as controlling the hydrolysis reaction can vary the resultant percentage of monomers having amine functionality.
  • Examples of monomers used to make a poly(vinylamine) include, but are not limited to, N-vinylformamide, N-vinyl methyl formamide, N-vinylphthahmide, N- vinylsuccinimide, N-vinyl-t-butylcarbamate, N-vinylacetamide, and mixtures of any of the foregoing. Most preferred are polymers prepared by the hydrolysis of N-vinylformamide. In the case of copolymers, nonionic monomers, such as those described above, are the preferred comonomers. Alternatively, poly(vinylamine) can be prepared by the
  • the molar percentage of nonionic monomer to cationic monomers may fall within the range of about 100: 1 to 1: 100, or 80:20 to 20 to 80, or 75:25: 25:75 or 40:60 to 60:40, where the molar percentages of nonionic monomers to cationic monomers must add up to 100%. It is to be understood that more than one kind of nonionic or cationic monomer may be present in synthetic polymer.
  • the anionic monomers used to make the synthetic polymer include, but are not limited to, the free acids and salts of acrylic acid; methacrylic acid; maleic acid; itaconic acid; acrylamidoglycolic acid; 2-acrylamido-2-methyl-1-propanesulfonic acid; 3- allyloxy-2- hydroxy-1-propanesulfonic acid; styrenesulfonic acid; vinylsulfonic acid; vinylphosphonic acid; 2-acrylamido-2-methylpropane phosphonic acid; and mixtures of any of the foregoing. Most common are the free acids or salts of acrylic acid, methacrylic acid, and 2-acrylamido-2-methyl-l-propanesuifonic acid.
  • the salt is selected from Na + , K + or NH 4 .
  • More than one kind of anionic monomer can be used to make the synthetic polymer.
  • the molar percentage of nonionic monomers to anionic monomers may fall within the range of about 100: 1 to 1 : 100, or 90: 10 to 30:70, or 40:60 to 70:30, where the molar percentages of nonionic monomers to anionic monomers must add up to 100%. It is to be understood that more than one kind of nonionic may be present. It is also to be understood that more than one kind of cationic monomer may be present.
  • the synthetic water-soluble or water-dispersible polymers can also be modified to impart additional properties to the synthetic polymer or to modify the synthetic polymer structure.
  • Polymerization of the monomers can occur in the presence of a polyfunctional agent, or the polyfunctional agent can be utilized to treat the polymer post- polymerization.
  • Useful polyfunctional agents comprise compounds having either at least two double bounds, a double bond and a reactive group, or two reactive groups.
  • Illustrative of those containing at least two double bounds are N,N ⁇ methylenebisacrylamide; N,N- methylenebismethacrylamide; polyethyleneglycol diacrylate; polyethyleneglycol dimethacrylate; N-vinyl acrylamide; divinylbenzene; triallylammonium salts, and N- methylallylacrylamide.
  • Polyfunctional branching agents containing at least one double bond and at least one reactive group include glycidyl acrylate; glycidyl methacrylate; acrolein; and methylolacryl amide.
  • Polyfunctional branching agents containing at least two reactive groups include dialdehydes, such as glyoxal; and diepoxy compounds; epichlorohydrin.
  • Examples of synthetic polymers used in the invention include but are not limited to polyvinylamine, glyoxylated cationic polyacrylamide, and cationic polyacrylamide.
  • Additional useful polymers of the present invention include PerformTM products such as SP 7200 (anionic polyacrylamide polymer), (Hercules Incorporated, Wilmington DE.
  • HercobondTM 6350 polyvinylamine copolymer polymer
  • the molecular weight of the non-ionic, cationic, or anionic polymers can range from 10,000 to 50,000,000 daltons, or 1,000,000 to 25,000,000 daltons, or 5,000000 to 20,000,000 daltons.
  • the treatment is effectuated by adding the PEO to the cellulosic furnish (slurry) at a feed point in the papermaking system and adding the water-soluble or water-dispersible synthetic polymers to the treated slurry.
  • the PEO and the synthetic polymers can be added at the same feed point or different feed points.
  • the PEO and the synthetic polymers can be added simultaneously, individual or as a blend.
  • the PEO and the synthetic polymers can be added in sequence to the papermaking system.
  • the slurry is then drained on the papermaking wire to dewater the fibrous slurry and to form a sheet.
  • the weight ratio of the PEO to synthetic water-soluble polymer can range from 100:1 to 1:100 or 80:20 to 20: 80 or 50:50 to 10:90.
  • Suitable cellulosic furnish or fiber pulps for the method of the invention include conventional papermaking stock such as traditional chemical pulp. For instance, bleached and unbleached sulfate pulp and sulfite pulp, mechanical pulp such as groundwood, thermo- mechanical pulp, chemi-thermomechanical pulp, recycled pulp such as old corrugated containers, newsprint, office waste, magazine paper and other non-deinked waste, deinked waste, and mixtures thereof, may be used.
  • the pH of the cellulosic furnish or slurry may range from 4 to 8.
  • a series of drainage experiments were conducted utilizing a paper machine pulp slurry comprising neutral sulfite semi-chemical (NSSC), virgin kraft, and old corrugated containers (OCC).
  • the di'ainage performance of the inventive process was evaluated using a vacuum test, where a Buechner funnel is affixed atop a graduated cylinder. 500 milliliters (mis) of the pulp slurry is mixed in a beaker using a mechanical overhead mixer, and the noted polymer treatment are added sequentially. The time required to collect the noted amount of filtrate is recorded, where a lower time is representative of the desired faster drainage.
  • the PEO is a high molecular weight (7 million) homopolymer and HercobondTM 6950 is a cationic modified polyamine water soluble polymer, (Hercules, Wilmington DE).
  • HercobondTM 6950 is a cationic modified polyamine water soluble polymer, (Hercules, Wilmington DE).
  • the data in Table 1 demonstrated no drainage response with the HercobondTM 6950 compared to the untreated system.
  • a drainage response is noted with the PEO.
  • a high drainage response is noted by the inventive process, where the pulp slurry is treated first with the PEO, followed by the addition of the HercobondTM 6950.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paper (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

A method of treating a cellulosic slurry to improve drainage is disclosed the method comprises adding a PEO to a cellulosic furnish in an amount of from 0.1 to 10 lbs per ton and adding a synthetic polymer to the furnish in an amount of from 0.1 to 10 lbs per ton, allowing the furnish to drain and forming a paper product.

Description

POLYETHYLENE OXIDE TREATMENT FOR DRAINAGE AGENTS
AND DRY STRENGTH AGENTS
[0001] This application claims the benefit of US provisional application number 61/864,262, filed 09 August 2013, the entire contents of which are hereby incorporated by reference.
BACKGROUND
[0002] Paper and paperboard are produced from an aqueous slurry of cellulosic fiber, depositing this slurry on a moving papermaking wire or fabric, and forming a sheet from the solid components of the slurry by draining the water. This sequence is followed by pressing and drying the sheet to further remove water.
[0003] Drainage or dewatering of the fibrous slurry on the papermaking wire or fabric is often the limiting step in achieving faster paper machine speeds. Improved dewatering can also result in a drier sheet in the press and dryer sections, resulting in reduced energy consumption. Chemicals are often added to the fibrous slurry before it reaches the papermaking wire or fabric to improve drainage/dewatering and solids retention; these chemicals are called retention and/or drainage aids.
[0004] Dry strength additives are used in paper mill to increase the strength of paper. It increases the strength of paper by increasing internal bond formation. Moreover dry strength additives improve bust strength, tear strength, wax pick values, folding endurance, stiffness, machine runnability, increase levels of paper filler uses etc. Dry strength additives also reduced linting and dusting.
[0005] Retention and drainage aids have reduced efficacy in some furnish substrates which contain high levels of soluble organics and salts. Two such examples of these furnishes are neutral sulfite semi chemical (NSSC) and kraft virgin linerboard, where high levels of soluble lignin and other organic materials containing a high anionic charge are present. These highly anionic materials neutralize the chai'ge on the conventional retention and drainage aids, significantly reducing their effectiveness. DETAILED DESCRIPTION OF INVENTION
[0006] It has been discovered that treatment of cellulosic furnish with a polyethylene oxide homo polymer or copolymer ("PEO") will improve the performance of the drainage or strength agents in cellulosic furnish that contain high levels of soluble lignin where the drainage or strength agents are not typically active. Soluble lignin levels in these cellulosic furnishes range from 25 parts-per-million (ppm) up to 500 ppm.
[0007] Without wishing to be bound by theory it is believed that the PEO reacts with the excess lignin and other excess anionic materials in the cellulosic furnish thereby allowing the drainage or strength agent to work without be hindering by reacting with the undesirable materials.
[0008] Molecular weights (Mw) are viscosity average molecular weight as determined from intrinsic viscosity determinations.
[0009] The PEO can be a homo-polymer of ethylene oxide, or a copolymer of ethylene oxide. Suitable comonomers include propylene oxide or butylene oxide. A homopolymer of polyethylene oxide is the most preferred. Additional suitable comonomers used to make the PEO copolymer can be cationic, anionic, non-ionic or hydrophobic monomers, and any mixture thereof. The molecular weight of the PEO homo-polymer or co-polymer can range from 1000 daltons up to 25,000,000 daltons or 100,000 to 15,000,000 daltons or 1,000,000 to 10,000,000 daltons. Examples of ethylene oxide containing homo polymers or copolymers are Ucarfloc™ 300, 302, 304, and 309 (available from Dow Chemical, Midland, Ml).
[0010] The feed point of the PEO treatment can include the thick stock, thin stock, white water, or process water. The PEO treatment can be added at the blend chest, machine chest, fan pump, cleaners, centriscreen, save-all, white water tray and white water silo.
[0011] The PEO treatment dosage can range from 0.01 pounds (lbs) to 10 lbs of PEO polymer per ton of furnish solids. The dosage can also be based upon the furnish volume, ranging from 0.01parts-per-million (ppm) to 10,000 ppm of PEO per volume of furnish or substrate water. The PEO is generally supplied as a dry powder or granular product, where it is dissolved at the application site. It can also be supplied to the end user as a slurry or dispersion for ease of use, where it can be diluted and fed into the process stream.
[0012] The drainage or strength agents, which will function due to the PEO treatment, are generally water-soluble or water-dispersible synthetic polymers, "synthetic polymer". The synthetic polymers can be nonionic polymers, cationic copolymers or anionic copolymers.
[0013] The nonionic monomers used to make the synthetic polymer include, but are not limited to, acrylamide; methacrylamide; N-alkylacryl amides, such as N- methylacrylamide; N,N-dialkylacrylamide, such as Ν,Ν-dimethylacrylamide; methyl methacrylate; methyl acrylate; acrylonitrile; N-vinyl methylacetamide; N-vinylformamide; N-vinylmethyl formamide; ; vinyl acetate; N-vinyl pyrrolidone and mixtures of any of the foregoing. The invention contemplates that other types of nonionic monomer can be used. More than one kind of non-ionic monomer can be used to make the synthetic polymer.
Preferable nonionic monomers used are acrylamide; methacrylamide, N- vinylformamide.
[0014] The cationic monomers used to make the synthetic polymer include, but are not limited to, cationic ethylenically unsaturated monomers such as the diallyldialkylammonium halides, such as diallyldimethylammonium chloride; the (meth)acrylates of
dialkylaminoalkyl compounds, such as dimethylaminoethyl (meth)acrylate,
diethylaminoethyl (meth) acrylate, dimethyl aminopropyl (meth)acrylate, 2-hydroxydimethyl aminopropyl (meth) acrylate, aminoethyl (meth)acrylate, and the salts and quaternaries thereof; the N,N-dialkylaminoaIkyj(meth)acrylamides, such as N,N- dimethylaminoethylacrylamide, and the salt and quaternaries thereof and mixtures of the foregoing. More than one kind of non-ionic monomer can be used to make the synthetic polymer. Most preferred are diallyldimethylammonium chloride and dimethylaminoethyl (meth) acrylate and the salt and quaternaries thereof and mixtures of the foregoing.
[0015] Poly(vinylamine) is also a suitable cationic synthetic polymer for the invention. The polyvinyl amine can be a homopolymer or a copolymer. One method of producing a polyvinylamine polymer is by polymerization of the monomer(s) followed by hydrolysis. The level of hydrolysis can be expressed as"% hydrolysis" or "hydrolysis%" on a molar basis. A hydrolyzed polymer can thus be described by as "% hydrolyzed." Moreover the level of hydrolysis can be approximated. For the purposes of applicants' invention, a poly(vinylamine) that is referred to as "50% hydrolyzed" means from 40% to 60% hydrolyzed. Likewise, a poly(vinylamine) that is about 100% hydrolyzed means from 80% to 100% hydrolyzed. The hydrolysis reaction results in the conversion of some or all of the monomer(s) to amines, as controlling the hydrolysis reaction can vary the resultant percentage of monomers having amine functionality.
[0016] Examples of monomers used to make a poly(vinylamine) include, but are not limited to, N-vinylformamide, N-vinyl methyl formamide, N-vinylphthahmide, N- vinylsuccinimide, N-vinyl-t-butylcarbamate, N-vinylacetamide, and mixtures of any of the foregoing. Most preferred are polymers prepared by the hydrolysis of N-vinylformamide. In the case of copolymers, nonionic monomers, such as those described above, are the preferred comonomers. Alternatively, poly(vinylamine) can be prepared by the
derivatization of a polymer. Examples of this process include, but are not limited to, the Hofmann reaction of polyacrylamide. It is contemplated that other synthetic routes to a poly(vinylamine) or polyamine can be utilized.
[0017] The molar percentage of nonionic monomer to cationic monomers may fall within the range of about 100: 1 to 1: 100, or 80:20 to 20 to 80, or 75:25: 25:75 or 40:60 to 60:40, where the molar percentages of nonionic monomers to cationic monomers must add up to 100%. It is to be understood that more than one kind of nonionic or cationic monomer may be present in synthetic polymer.
[0018] The anionic monomers used to make the synthetic polymer include, but are not limited to, the free acids and salts of acrylic acid; methacrylic acid; maleic acid; itaconic acid; acrylamidoglycolic acid; 2-acrylamido-2-methyl-1-propanesulfonic acid; 3- allyloxy-2- hydroxy-1-propanesulfonic acid; styrenesulfonic acid; vinylsulfonic acid; vinylphosphonic acid; 2-acrylamido-2-methylpropane phosphonic acid; and mixtures of any of the foregoing. Most common are the free acids or salts of acrylic acid, methacrylic acid, and 2-acrylamido-2-methyl-l-propanesuifonic acid. When a salt form of an acid is used to make an anionic polymer, the salt is selected from Na+, K+ or NH4. More than one kind of anionic monomer can be used to make the synthetic polymer. [0019] The molar percentage of nonionic monomers to anionic monomers may fall within the range of about 100: 1 to 1 : 100, or 90: 10 to 30:70, or 40:60 to 70:30, where the molar percentages of nonionic monomers to anionic monomers must add up to 100%. It is to be understood that more than one kind of nonionic may be present. It is also to be understood that more than one kind of cationic monomer may be present.
[0020] The synthetic water-soluble or water-dispersible polymers can also be modified to impart additional properties to the synthetic polymer or to modify the synthetic polymer structure. Polymerization of the monomers can occur in the presence of a polyfunctional agent, or the polyfunctional agent can be utilized to treat the polymer post- polymerization. Useful polyfunctional agents comprise compounds having either at least two double bounds, a double bond and a reactive group, or two reactive groups. Illustrative of those containing at least two double bounds are N,N~ methylenebisacrylamide; N,N- methylenebismethacrylamide; polyethyleneglycol diacrylate; polyethyleneglycol dimethacrylate; N-vinyl acrylamide; divinylbenzene; triallylammonium salts, and N- methylallylacrylamide. Polyfunctional branching agents containing at least one double bond and at least one reactive group include glycidyl acrylate; glycidyl methacrylate; acrolein; and methylolacryl amide. Polyfunctional branching agents containing at least two reactive groups include dialdehydes, such as glyoxal; and diepoxy compounds; epichlorohydrin.
[0021] Examples of synthetic polymers used in the invention include but are not limited to polyvinylamine, glyoxylated cationic polyacrylamide, and cationic polyacrylamide.
Preferred are 100% hydrolyzed polyvinylamine, 50% hydrolyzed polyvinylamine and cationic polyacrylamide containing at least 10 mole % cationic monomer. One example would be cationic polyacrylamide containing at least 10 mole %
diallyldimethylammonium chloride or 10 mole % dimethylaminoethyl (meth) acrylate.
Additional useful polymers of the present invention include Perform™ products such as SP 7200 (anionic polyacrylamide polymer), (Hercules Incorporated, Wilmington DE.
Hercobond™ 6350 (polyvinylamine copolymer polymer), Hercobond™ 6363
(polyvinylamine copolymer), Hercobond™ 6950 (polyvinylamine copolymer),
Hercobond™ 1307 (modified cationic polyacrylamide), Perform™ PC 8181 (cationic polyacrylamide), Perform™ PC 8179 (cationic polyacrylamide). [0022] The molecular weight of the non-ionic, cationic, or anionic polymers can range from 10,000 to 50,000,000 daltons, or 1,000,000 to 25,000,000 daltons, or 5,000000 to 20,000,000 daltons.
[0023] The treatment is effectuated by adding the PEO to the cellulosic furnish (slurry) at a feed point in the papermaking system and adding the water-soluble or water-dispersible synthetic polymers to the treated slurry. The PEO and the synthetic polymers can be added at the same feed point or different feed points. The PEO and the synthetic polymers can be added simultaneously, individual or as a blend. In one embodiment the PEO and the synthetic polymers can be added in sequence to the papermaking system. The slurry is then drained on the papermaking wire to dewater the fibrous slurry and to form a sheet.
Improved drainage is observed when the PEO and the synthetic polymers are used in conjunction with one another.
[0024] Less synthetic polymer can be used while still maintaining the same performance level (drainage) when the PEO is used in conjunction with the synthetic polymer.
[0025] The feed point of the synthetic polymer can include the thick stock or thin stock. Potential addition points of the synthetic polymer can include the blend chest, machine chest, fan pump, cleaners, and before or after the centriscreen. The synthetic polymer dosage can range from 0.01 lbs to 10 lbs. of active polymer per ton of furnish solids or 0.01 to 5 , or 0.05 to 5, or 0.1 to 2 lbs. of polymer per ton of furnish solids. The synthetic polymer can be manufactured and supplied to the end user as a dry or granular powder, an aqueous solution or dispersion, or an inverse emulsion.
[0026] The weight ratio of the PEO to synthetic water-soluble polymer can range from 100:1 to 1:100 or 80:20 to 20: 80 or 50:50 to 10:90.
[0027] Suitable cellulosic furnish or fiber pulps for the method of the invention include conventional papermaking stock such as traditional chemical pulp. For instance, bleached and unbleached sulfate pulp and sulfite pulp, mechanical pulp such as groundwood, thermo- mechanical pulp, chemi-thermomechanical pulp, recycled pulp such as old corrugated containers, newsprint, office waste, magazine paper and other non-deinked waste, deinked waste, and mixtures thereof, may be used. The pH of the cellulosic furnish or slurry may range from 4 to 8. EXAMPLES
[0028] A series of drainage experiments were conducted utilizing a paper machine pulp slurry comprising neutral sulfite semi-chemical (NSSC), virgin kraft, and old corrugated containers (OCC). The di'ainage performance of the inventive process was evaluated using a vacuum test, where a Buechner funnel is affixed atop a graduated cylinder. 500 milliliters (mis) of the pulp slurry is mixed in a beaker using a mechanical overhead mixer, and the noted polymer treatment are added sequentially. The time required to collect the noted amount of filtrate is recorded, where a lower time is representative of the desired faster drainage. The PEO is a high molecular weight (7 million) homopolymer and Hercobond™ 6950 is a cationic modified polyamine water soluble polymer, (Hercules, Wilmington DE). The data in Table 1 demonstrated no drainage response with the Hercobond™ 6950 compared to the untreated system. A drainage response is noted with the PEO. A high drainage response is noted by the inventive process, where the pulp slurry is treated first with the PEO, followed by the addition of the Hercobond™ 6950.

Claims

We Claim:
1. A method of treating a cellulosic slurry to improve drainage comprising adding a PEO to a cellulosic furnish in an amount of from 0.1 lbs to 10 lbs per ton and adding a synthetic polymer to the furnish in an amount of from 0.1 to 10 lbs per ton, allowing the furnish to drain and forming a paper product.
2. The method of claim 1 , wherein the PEO is selected from the group consisting of homo polymers of ethylene oxide, copolymers of ethylene oxide with propylene oxide, and copolymers of ethylene oxide with butylene oxide.
3. The method of claim 1 or 2, wherein the synthetic polymer is an anionic polymer.
4. The method of any one of claims 1 to 3, wherein the synthetic polymer is an anionic polyacrylamide.
5. The method of claim 1 or 2, wherein the synthetic polymer is an cationic polyacrylamide.
6. The method of any one of claims 1 to 3, wherein the synthetic polymer is a homopolymer or copolymer comprising polyvinylamine or polyvinylformamide.
7. The method of any one of claims 1-6, wherein the PEO has a molecular weight of between 100,000 to 15,000,000 daltons.
8. The method of any one of claims 1-7, wherein the synthetic polymer has a molecular weight of 1,000,000 to 25,000,000 daltons.
9. The method of claim 3 or 4, wherein the anionic polymer is made using at least one anionic monomer selected form the group consisting of the free acids and salts of acrylic acid; methacrylic acid; maleic acid; itaconic acid; acrylamidoglycolic acid; 2- acrylamido-2-methyl-1 -propanesulfonic acid; 3-allyloxy-2-hydroxy-1- propanesulfonic acid; styrenesulfonic acid; vinylsulfonic acid; vinylphosphonic acid; 2-acrylamido-2- methylpropane phosplionic acid; and mixtures of any of the foregoing. Most common are the free acids or salts of acrylic acid; methacrylic acid, and 2-acrylamido-2-methyl-1- propanesulfonic acid.
10. The method of claim 5 or 6, wherein the cationic polymer is made using at least one cationic monomer selected from the group consisting of diallyldialkylammonium halides, such as diallyldimethylarnmonium chloride; the (meth)acrylates of
dialkylaminoalkyl compounds, such as dimethylaminoethyl (meth)acrylate,
diethylaminoethyl (meth)acrylate, dimethyl aminopropyl (meth)acrylate, 2- hydroxydimethyl aminopropyl (rneth)acrylate, aminoethyl (meth)acrylate, and the salts and quaternaries thereof; the N,N"dialkylaminoalkyl(meth)acrylamides, such as N,N- dimethylaminoethylacrylamide, and the salt and quaternaries thereof and mixtures of the foregoing.
11. The method of any one of claims 1-10, wherein the weight ratio of the PEO to synthetic water-soluble polymer is in the range of from about 100:1 to about 1: 100.
12. The method of any one of claims 1-11, wherein the ratio of the PEO to synthetic water-soluble polymer is between about 80:20 to about 20:80.
13. The method of any one of claims 1-12, wherein the ratio of the PEO to synthetic water-soluble polymer is between about 50:50 to about 10:90.
14. The method of any of the claims 1 to 10 wherein the amount of synthetic polymer added to the furnish is from about 0.05 lbs to about 5 lbs of synthetic polymer per ton of furnish solids.
15. The method of any one of claims 1-14, wherein the amount of synthetic polymer added to the furnish is from 0.1 lbs to 2 lbs of synthetic polymer per ton of furnish solids.
16. The method of any one of claims 1-15, wherein the cellulosic furnish has a soluble lignin level of from 25 ppm up to 500 ppm.
EP14843177.8A 2013-08-09 2014-08-07 Polyethylene oxide treatment for drainage agents and dry strength agents Withdrawn EP3030716A2 (en)

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US201361864262P 2013-08-09 2013-08-09
PCT/IB2014/002506 WO2015063585A2 (en) 2013-08-09 2014-08-07 Polyethylene oxide treatment for drainage agents and dry strength agents

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AU (1) AU2014343348A1 (en)
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EP3775087B1 (en) * 2018-04-04 2023-05-24 Solenis Technologies, L.P. Foam assisted application of strength additives to paper products
US10941524B2 (en) * 2018-11-30 2021-03-09 Solenis Technologies, L.P. Pulp mixture

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CA2918468A1 (en) 2015-05-07
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CA2922074A1 (en) 2015-05-07
MX2016000879A (en) 2016-05-05
WO2015063585A3 (en) 2015-07-16
AU2014343348A1 (en) 2016-02-04
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US20150041090A1 (en) 2015-02-12
WO2015063585A2 (en) 2015-05-07
CN105531421A (en) 2016-04-27

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