EP0953679B1 - Papierfestigungsmittel und Verfahren zur Festigung von Papier - Google Patents

Papierfestigungsmittel und Verfahren zur Festigung von Papier Download PDF

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Publication number
EP0953679B1
EP0953679B1 EP98111753A EP98111753A EP0953679B1 EP 0953679 B1 EP0953679 B1 EP 0953679B1 EP 98111753 A EP98111753 A EP 98111753A EP 98111753 A EP98111753 A EP 98111753A EP 0953679 B1 EP0953679 B1 EP 0953679B1
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EP
European Patent Office
Prior art keywords
polymer
dispersion
paper
diluted
polymer dispersion
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EP98111753A
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English (en)
French (fr)
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EP0953679A1 (de
Inventor
Tanaka Katsutoshi
Koshiji Yuichi
Matoba Masayuki
Nakamura Tomonori
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Hymo Corp
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Hymo Corp
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Priority claimed from JP12664398A external-priority patent/JP3302642B2/ja
Priority claimed from JP17532898A external-priority patent/JPH11350384A/ja
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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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/18—Reinforcing agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • 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
    • D21H17/43—Carboxyl groups or derivatives thereof
    • 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
    • D21H21/50—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by form
    • D21H21/52—Additives of definite length or shape

Definitions

  • the present invention relates to a polymer dispersion suitable for adding as paper strengthening agent comprising a dispersion of fine water-insoluble polymer particles manufactured by polymerizing a monomer containing (meth)acrylic acid in an aqueous solution and precipitating the produced polymer, which is added to a paper layer after a paper layer is formed in a paper making process and relates to a paper strengthening method wherein a low-viscosity polymer dispersion prepared by diluting the present paper strengthening agent with water is impregnated into paper by spraying or coating.
  • the Laid-Open Japanese Patent Application No. Sho 62-20511 discloses a method of obtaining a water-soluble polymer dispersion by polymerizing a monomer in an aqueous salt solution that dissolves the monomer and does not dissolve a formed polymer in the presence of a polymer electrolyte.
  • the Laid-open Japanese Patent Application No. Sho 60-185900 discloses a method for obtaining a dispersion of fine polymer particles by polymerizing acrylic acid with acrylamide in an aqueous salt solution that dissolves the monomers but does not dissolve the formed polymer.
  • the fine particles can be obtained in the absence of any polymer electrolyte.
  • the fine polymer particles obtained here are water-insoluble and dissolved in a solvent if the dispersion is neutralized. That is, it is a different technique from that proposed in the Laid-open Japanese Patent Application No. Sho 62-20511.
  • the fine particles in the dispersion of acrylic acid-acrylamide copolymer agglomerate on standing resulting in curding in the manner of bean curd, thereby having the disadvantage of being unable to be stored for long periods of time.
  • EP-A-0 717 056 describes an aqueous dispersion of an amphoteric water soluble polymer obtainable by polymerization of a cationic monomer and an anionic monomer. It has been described that the obtained polymer was soluble when ammonium sulfate solution was added.
  • US-A-5,045,587 describes a method for maintaining the flowability of an acrylic polymer dispersion by which the flowability of a polymer can be maintained.
  • the polymeric dispersion described in D2 contains a anionic surfacant and an olegineous liquid.
  • An object of the present invention is to increase bursting strength, ring crush strength and surface paper strength such as wax pic by efficiently impregnating a paper layer with a high molecular weight polymer.
  • Another object of the present invention is to increase the interlayer adhesive paper strength by adhering a high molecular weight polymer to a plurality of web surfaces.
  • a dispersion of fine polymer particles having a low viscosity, good workability and excellent stability for preservation can be manufactured by polymerizing a monomer containing (meth)acrylic acid in the presence of a dispersibility retaining agent such as a cationic polymer electrolyte to precipitate the produced polymer.
  • the inventors of the present invention also discovered that said dispersion demonstrates outstanding effects such as paper strengthening by coating said dispersion onto dry paper with a size press, gate roll coater or blade coater and so forth, paper strengthening by spray impregnating said dispersion into wet paper on a wire part, and interlayer adhesion paper strengthening by adhering a polymer of said dispersion onto a plurality of web surfaces, thereby leading to completion of the present invention.
  • a first aspect of the present invention as described in claim 1 is to provide a paper strengthening agent substantially comprising a polymer dispersion manufactured by polymerizing a monomer containing (meth)acrylic acid in an aqueous solution and precipitating the produced polymer as fine particles, and which is added to a paper layer after a paper layer is formed, wherein
  • a second aspect of the present invention is to provide a paper strengthening agent characterized in that, in the above-mentioned paper strengthening agent, the polymer dispersion is polymerized and precipitated in the presence of a dispersibility retaining agent comprising a polyvalent electrolyte.
  • a third aspect of the present invention is to provide a paper strengthening agent characterized in that, in the above-mentioned paper strengthening agent, the dispersibility retaining agent is one selected from a cationic polymer electrolyte, a surface active agent having a polyvalent cationic hydrophilic group and a hydrophobic group, and a mixture thereof.
  • a fourth aspect of the present invention is to provide a paper strengthening agent characterized in that, in the above-mentioned paper strengthening agent, the weight ratio of the monomer containing (meth)acrylic acid in an aqueous solution to the dispersibility retaining agent is 100:1 to 10:1.
  • a fifth aspect of the present invention is to provide a paper strengthening agent characterized in that, in the above-mentioned paper strengthening agent, the viscosity of said polymer dispersion is 30 to 1500 mPa ⁇ s immediately after and one month after the production.
  • a sixth aspect of the present invention is to provide a paper strengthening agent characterized in that, in the above-mentioned paper strengthening agent, the dispersibility retaining agent is dimethyldiallylammonium chloride (co)polymer.
  • a seventh aspect of the present invention is to provide a paper strengthening agent characterized in that, in the above-mentioned paper strengthening agent, the dispersibility retaining agent is an alkyl group-substituted and/or an aralkyl group-substituted polyethylenepolyamine.
  • An eighth aspect of the present invention is to provide a paper strengthening agent characterized in that, in the above-mentioned paper strengthening agent, the dispersibility retaining agent is an alkyl group having at least 5 carbon atoms-substituted and/or an aralkyl group-substituted pentaethylenehexamine.
  • a ninth aspect of the present invention as described in claim 9 is to provide a paper strengthening method comprising the steps of: diluting the above-mentioned paper strengthening agent with water to prepare a diluted dispersion, coating or impregnating said diluted dispersion onto a dry paper, and drying the treated dry paper.
  • a tenth aspect of the present invention as described in claim 10 is to provide a paper strengthening method wherein a diluted dispersion of the above-mentioned paper strengthening agent is impregnated into wet paper.
  • An eleventh aspect of the present invention is to provide a paper strengthening method wherein a diluted dispersion of the above-mentioned paper strengthening agent is spray impregnated into wet paper.
  • a twelfth aspect of the present invention is to provide a paper strengthening method wherein the wet paper in the above method is of a single layer.
  • a thirteenth aspect of the present invention as described in claim 13 is to provide a method of preventing interlayer separation comprising the steps of spraying a diluted dispersion of the above-mentioned paper strengthening agent onto a web surface to prepare a plurality of webs having a polymer adhered to surfaces thereof, and pressing the surfaces of said webs so as to be superimposed followed by drying.
  • the monomer that contains (meth)acrylic acid used in the present invention is a mixture of 5 to 50 mol% of acrylic acid, methacrylic acid or a mixture thereof, and itaconic acid and/or acryloylaminoisobutyl sulfonic acid and so forth over a range that does not lower the degree of polymerization or have a detrimental effect on solubility; and, 50 to 95 mol% of one type of nonionic monomer selected from the group consisting of (meth)acrylamide, (meth)acrylonitrile, N-vinylcarboxylic amide, N-isopropyl (meth) acrylamide, N,N-dimethyl (meth) acrylamide, methyl(meth)acrylate, hydroxyethyl(meth)acrylate, vinylmethylether, vinylacetate, styrene and a mixture thereof.
  • Cationic monomer can be polymerized as a component of the monomer containing (meth)acrylic acid over the range in which water insolubility of the resulted polymer can be secured when diluting with distilled water.
  • a monomer composition that contains 5 to 50 mol% of (meth)acrylic acid, 50 to 95 mol% of (meth)acrylamide and 0 to 50 mol% of (meth)acrylonitrile is most preferable.
  • dispersibility retaining agent comprising a cationic polymer electrolyte used in the present invention are (co)polymers of salts or quaternary products of dialkylaminoalkyl(meth)acrylate, (co)polymers of salts or quaternary products of dialkylaminoalkyl(meth)acrylamide, and (co)polymers of dialkyldiallylammonium salt.
  • Examples of the salts or quaternary products of dialkylaminoalkyl (meth)acrylate include dimethylaminoethyl (meth)acrylate hydrochloride and acryloyloxyethyltrimethylammonium chloride.
  • examples of the salts or quaternary products of the dialkylaminoalkyl(meth)acrylamide include hydrochlorides or methylated products of dialkylaminopropyl(meth)acrylamide.
  • An example of dialkyldiallylammonium salt is dimethyldiallylammonium chloride.
  • the cationic water-soluble polymer may be a homopolymer or a copolymer with a nonionic monomer such as acrylamide.
  • a particularly preferable cationic water-soluble polymer is dimethyldiallylammonium chloride (co)polymer.
  • An example of a dispersibility retaining agent comprising a surface active agent having a polyvalent cationic hydrophilic group and a hydrophobic group used in the present invention is a substituted polyethylenepolyamine in which at least one hydrogen atom at a nitrogen atom thereof is substituted by an alkyl group and/or an aralkyl group.
  • An alkyl group-substituted product of pentaethylenehexamine having at least 5 carbon atoms in said alkyl group is effective.
  • the weight ratio of the monomer that contains (meth)acrylic acid to the dispersibility retaining agent is preferably 100:1 to 10:1. If the amount of the dispersibility retaining agent is too small, the dispersion curds into the form of bean curd. On the other hand, excessive addition of dispersibility retaining agent is economically meaningless.
  • the dispersibility retaining agent according to present invention may be a sole compound or a mixture thereof.
  • the viscosity of the polymer dispersion is maintained within the range of 30 to 5000 mPa ⁇ s immediately after and one month after the production, and is stable for a long time.
  • a product having a viscosity of 30 to 1500 mPa ⁇ s is preferable in terms of handling when considering convenience during use.
  • the surface charge of the polymer particles is considered to be cationic, and it can also be mixed with an aqueous solution of a water-soluble cationic polymer and an aqueous dispersion.
  • An aqueous salt solution may also be used in the present invention for the purpose of promoting polymer precipitation.
  • the salt that forms said aqueous salt solution include alkaline metal salts such as sodium salt and potassium salt, and ammonium salts such as ammonium chloride, ammonium sulfate and ammonium nitrate.
  • the concentration and pH of said aqueous salt solution must be such that the monomers containing (meth)acrylic acid dissolve, while the polymer that is formed does not. In contrast, it is necessary that the dispersibility retaining agent that is also present be soluble in said aqueous salt solution.
  • the (meth)acrylic acid (co)polymer dispersion and the dispersibility retaining agent in the present invention can respectively be obtained by dissolving monomer(s) in an aqueous medium under nitrogen atmosphere without oxygen, and radical polymerizing the monomer(s) by adding a water-soluble azo type polymerization initiator such as 2,2'-azobis(2-amidinopropane) hydrochloride or a water-soluble redox type polymerization initiator using such as both ammonium persulfate and sodium hydrogen sulfite.
  • a water-soluble azo type polymerization initiator such as 2,2'-azobis(2-amidinopropane) hydrochloride
  • a water-soluble redox type polymerization initiator such as both ammonium persulfate and sodium hydrogen sulfite.
  • Temperature of the polymerization system can be selected arbitrarily depending on the property of the polymerization initiator used within the range of 0 to 100°C.
  • a chain transfer agent such as isopropylalcohol or mercaptan can be added and used by arbitrary selection in the same manner as ordinary radical polymerization.
  • stirring at a peripheral speed of a stirrer of at least 1 meter/min must be performed for smoothening the precipitation of fine polymer particles. There is no upper limit of the stirring speed and any stirring conditions can be selected provided that the contents do not overflow from the equipment.
  • preparation of the dispersibility retaining agent is generally performed by the stationary polymerization in an aqueous solution
  • the polymerization therefor in the present invention is preferably performed under stirring from the viewpoint of the homogenization of products.
  • the polymer concentration in the dispersion of the present invention is high or at least 5 wt% and is normally from 5 wt% to about 40 wt%.
  • the dispersion of the present invention contains a high concentration of formed polymer, the viscosity of the dispersion is low, normally low at 30 to 5000 mPa ⁇ s, and preferably 30 to 1500 mPa ⁇ s, because the polymer is stably dispersed in a dispersion medium in a state of fine particles. Therefore, as its characteristics, the polymer dispersion can flow easily and can be handled very easily.
  • the polymer particles in the dispersion of the present invention can be recognized in a non-diluted state and in a state diluted 10 times with distilled water when it is magnified by a factor of 400 with an optical microscope.
  • the average particle diameter of the polymer particles is normally 1 to 100 ⁇ m, preferably 2 to 50 ⁇ m, and more preferably 2 to 30 ⁇ m.
  • the average particle diameter of the polymer particles exceeds 100 ⁇ m, since the particles tend to precipitate easily, settling stability deteriorates.
  • solubility also deteriorates at the time of use due to the large size of the polymer particles even when mixed with water, thus requiring a long time to completely dissolve the polymer.
  • the dispersion of the present invention has excellent settling stability and any trouble such as adherence of particles to each other thereby creating masses does not occur even during storage at the normal temperature.
  • the solubility thereof in water during use is extremely good.
  • the molecular weight of the polymer in the dispersion of the present invention is not specially limited. If the dispersion of the present invention is expressed by the solution viscosity when dissolved in 2 wt% of aqueous salt solution of ammonium sulfate (viscosity measured at 25°C by using a Brookfield viscometer) in such a manner that the concentration of the polymer becomes 0.5 wt%, it is normally in the range of 5 to 200 mPa ⁇ s. Also, the dispersion of the present invention hardly has any change in viscosity with time even after storage for 1 month.
  • the polymer particles can be recognized with a microscope and when an alkali is added to the dispersion to adjust the pH of the dispersion to 7.0, said polymer particles are dissolved to form an aqueous solution. That is, the dispersion of the present invention can be said to be a dispersion of the fine particles of water-insoluble polymer.
  • paper strengthening effects are obtained by coating or impregnating an aqueous diluted dispersion of said polymer dispersion onto a dry paper or wet paper surface and then drying.
  • the polymer dispersion can be used in combination with another wet end chemical, for example a retention aid for fillers or a drainage aid. More specifically, an aqueous solution of cationic starch, cationic polyacrylamide or other wet end paper strengthening agent and so forth is added and mixed with a paper material, and spraying a diluted aqueous dispersion of the polymer dispersion according to the present invention onto wet paper at each intermediate stage of formation of the sheet, namely before the suction part or on the suction part, with a wire to impregnate said diluted aqueous dispersion into the paper.
  • another wet end chemical for example a retention aid for fillers or a drainage aid.
  • polymer is impregnated onto the surface and inside the paper by coating a diluted aqueous dispersion of the polymer dispersion of the present invention onto the resulting dry paper by a size press, gate roll coater or blade coater and so forth.
  • Paper to which the paper strengthening agent is added for these non-wet ends is frequently used in printing paper, recording paper and PPC paper (i.e. paper for plan paper copy), and the sheets are typically single layer.
  • a plurality of webs are typically combined with each other.
  • a diluted aqueous dispersion of the polymer dispersion agent of the present invention onto a web surface to prepare a plurality of webs adhered with polymer on the surface, and drying after pressing so as to overlap the surfaces of said webs, the strength of the paper, such as. the interlayer adhesive paper strength of a plurality of laminated sheets of paper, can be increased making it possible to prevent interlayer separation.
  • interlayer separation preventive agents such as starch, modified starch, casein and galactomannan may be also be used in the polymer dispersion of the present invention.
  • the present invention is characterized in that the polymer comprising a water-soluble monomer containing (meth)acrylate is not used.
  • Methodacrylic (co)polymer is refractory and has a low viscosity even though the molecular weight is high, enabling even highly concentrated diluted aqueous dispersions to be coated onto a surface easily.
  • a high molecular weight polymer can be efficiently coated in a water-insoluble state. Since the pH rises when the coated polymer is impregnated into paper, a portion of the polymer becomes water-soluble and transforms into a paste-like substance. Consequently, it is expected to function as an adhesive.
  • the polymer dispersion is sprayed or coated onto the surface after diluting to a polymer concentration of 0.1 to 0.5 wt%.
  • the amount of polymer added to the paper by spraying or coating is a polymer net amount of 0.05 to 1.0 wt% per pulp SS (i.e. suspended solid), and preferably 0.1 to 0.5 wt%.
  • Example-1 In a reactor equipped with a stirrer, a nitrogen aeration pipe and a temperature controller, 10 parts of a monomer composition consisting of 15 mol% of acrylic acid, 55 mol% of acrylamide and 30 mol% of acrylonitrile, and 1 part of polydimethyldiallylammonium chloride as a dispersant (manufactured by CPS Co., trade name: Age Flock WT40HV) were dissolved in 89 parts of deionized water. Thereafter, as a polymerization initiator, 2,2'-azobis[2-(imidazoline-2-yl)propane] dihydrochloride (manufactured by Wako Pure Chemical Industries, Ltd., trade name: VA-044) was added. Under stirring, the polymerization was carried out for 20 hours at 35°C to obtain a polymer dispersion (pH 3) in which 5 to 50 ⁇ m fine particles were dispersed. This dispersion is referred to as "Sample-1".
  • the viscosity of said polymer dispersion (Sample-1) was 1000 mPa ⁇ s, fine particles were recognized with a microscope even after diluting 10 times with distilled water, and the polymer was essentially confirmed to be water-insoluble.
  • Sodium carbonate aqueous solution was mixed in said dispersion to adjust the pH of the dispersion to 7, after which the polymer was dissolved and the molecular weight thereof was determined from the intrinsic viscosity based on said aqueous solution.
  • Example-2 The same operation as that of Preparative Example-1 was performed with the exception of using a monomer composition consisting of 30 mol% of acrylic acid, 45 mol% of acrylamide and 25 mol% of acrylonitrile to obtain a water-insoluble polymer dispersion. This dispersion is referred to as "Sample-2".
  • the viscosity of said polymer dispersion (Sample-3) was 500 mPa ⁇ s or less, fine particles were recognized with a microscope even after diluting said dispersion 10 times with distilled water, and the polymer was essentially confirmed to be water-insoluble.
  • Sodium carbonate aqueous solution was mixed in said dispersion to adjust the pH of the dispersion to 7, after which the polymer was dissolved and the molecular weight thereof was determined from the intrinsic viscosity based on said aqueous solution.
  • Example-4 a polymer dispersion in which 10 to 20 ⁇ m fine particles were dispersed in the aqueous salt solution. This dispersion is referred to as "Sample-4".
  • the viscosity of said polymer dispersion was 500 mPa ⁇ s or less, fine particles were recognized in said dispersion with a microscope even after diluting 10 times with distilled water, and the polymer was essentially confirmed to be water-insoluble.
  • Sodium carbonate aqueous solution was mixed in said dispersion to adjust the pH of the dispersion to 7, after which the polymer was dissolved and the molecular weight thereof was determined from the intrinsic viscosity based on said aqueous solution.
  • the polymer dispersion of the present example was diluted with pH 3.0 acidic water to prepare a diluted aqueous dispersion having a polymer concentration of 2.0%.
  • This diluted dispersion was coated onto commercially available medium quality paper (basis weight: 55 g/m 2 , manufactured by Daishowa Paper Co., Ltd., neutral paper) using a coating rod and roll dried for 5 minutes at 105°C to obtain coated paper.
  • the amounts of coated polymer were 0.1 g/m 2 and 0.2 g/m 2 .
  • the results of bursting strength and surface strength tests are shown in Table 2. Results of Paper Strengthening Effect Test No.
  • the polymer dispersion of the present example was diluted with pH 3.0 acidic water followed by the addition of acidic starch to prepare a coating liquid having a polymer concentration of 2.0% and acidic starch concentration of 2.0%.
  • This coating liquid was coated onto medium quality paper having a basis weight of 60 g/m 2 using a gate roll coater followed by drying to obtain a coated paper.
  • the amounts of coated polymer were 0.1 g/m 2 and 0.2 g/m 2 .
  • the results of bursting strength and surface strength tests are shown in Table 3. Results of Paper Strengthening Effect Test No.
  • the paper surface coating liquids prepared from the paper strengthening agents of the present invention can be easily coated onto paper in the form of a diluted dispersion having low viscosity and good workability, and are able to provide paper having high paper strength.
  • Old corrugated cardboard was beaten in a Niagara type beater and adjusted to the freeness of 400 ml of Canadian Standard Freeness (C.S.F.) to prepare pulp.
  • a liquid bond of 2% was added to said pulp followed by stirring to obtain a uniform mixture.
  • the resulting pulp slurry was diluted to 0.5%, and wet paper A was obtained having a dry basis weight of 125 g/m 2 and moisture content of 96% using a hand-made paper tester.
  • Diluted dispersions of each sample having a polymer concentration of 0.25% were sprayed onto one side of wet paper A using a nozzle at a pressure of 2 atm according to the polymer amounts described in Table 4 (polymer content per solid content of the pulp), followed by suctioning from the opposite side thereof.
  • This a model test in the case of spraying at a wire part for forming paper from pulp slurry.
  • wet paper A was placed between blankets and pressed twice with a test calendar followed by drying to obtain paper for measuring paper
  • the paper strengthening agent of the present invention was able to be sprayed easily in the form of a diluted dispersion with low viscosity and good workability, and paper was able to be provided having good establishment of retention in the paper and high paper strength without the nozzle becoming clogged or the occurrence of non-uniform adhesion.
  • Old corrugated cardboard was beaten in a Niagara type beater and adjusted to the freeness of 400 ml of the Canadian Standard Freeness (C.S.F.) to prepare pulp.
  • a liquid bond of 2% and a commercially available anionic paper strengthening agent of 0.9% were added to the pulp and stirred to mix uniformly.
  • the resulting pulp slurry was diluted to 0.5%, and wet paper A having a dry basis weight of 100 g/m 2 and moisture content of 86% and wet paper B having a dry basis weight of 100 g/m 2 and moisture content of 96% were prepared by a hand-made paper tester.
  • Diluted dispersions of each sample of the present invention having a polymer concentration of 0.5% were sprayed onto one side of wet paper A using a nozzle at a pressure of 2 atm according to the polymer amounts described in Table 5 (polymer content per solid content of the pulp). Thereafter, the coated surface of the wet paper A was overlaid with the surface of wet paper B after which they were placed between blankets and pressed through a test calendar and dried to obtain a dried combination board. After adjusting the moisture of this combination board, the T-peel strength thereof (g/inch) was measured in accordance with J-TAPPI paper pulp test method No. 19-77. The results are shown in Table 5.
  • the interlayer adhesive paper strengthening agent of the present invention can be easily sprayed in the form of a diluted dispersion having low viscosity and good workability, and combination paper is able to be provided having high interlayer separation effects without the nozzle becoming clogged or the occurrence of non-uniform adhesion.

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Claims (13)

  1. Polymerdispersion, die für das Zusetzen als Verstärkungsmittel zu einer geformten Papierschicht nach Verdünnung der Dispersion mit Wasser geeignet ist, hergestellt durch Polymerisierung eines Monomergemisches mit (Meth)acrylsäure in wässriger Lösung und Ausfällen des hergestellten Polymers als feine Partikel, wobei
    (1) die Konzentration des (Meth)acrylsäure-(Co)polymers in der Polymerdispersion mindestens 5 Gew.-% beträgt,
    (2) der mittlere Partikeldurchmesser der (Meth)acrylsäure-(Co)polymer-Partikel in der Polymerdispersion 1 bis 100 um beträgt,
    (3) die Viskosität der Polymerdispersion direkt nach und ein Monat nach der Herstellung 30 bis 5000 mPa·s beträgt,
    (4) die Polymer-Partikel erkannt werden können, wenn die Polymerdispersion mit destilliertem Wasser 10-fach verdünnt wird und die verdünnte Dispersion um einen Faktor von 400 vergrößert und mit einem Mikroskop untersucht wird, und
    (5) die Polymer-Partikel gelöst werden, um eine wässrige Lösung zu bilden, wenn der pH-Wert der verdünnten Dispersion durch Zugabe von Alkali auf 7,0 eingestellt wird.
  2. Die Polymerdispersion gemäß Anspruch 1, wobei die Polymerdispersion in Anwesenheit eines die Dispergierfähigkeit beibehaltenden Mittels, umfassend einen polyvalenten Elektrolyt, polymerisiert und ausgefällt wird.
  3. Die Polymerdispersion gemäß Anspruch 1 oder Anspruch 2, wobei das die Dispergierfähigkeit beibehaltende Mittel aus einem kationischen Polymer-Elektrolyten, einem oberflächenaktiven Mittel mit einer polyvalenten kationischen hydrophilen Gruppe und hydrophoben Gruppe und einem Gemisch daraus ausgewählt wird.
  4. Die Polymerdispersion gemäß einem der Ansprüche 1 bis 3, wobei das Gewichtsverhältnis zwischen dem Monomer mit (Meth)acrylsäure in einer wässrigen Lösung und dem die Dispergierfähigkeit beibehaltenden Mittel 100:1 bis 10:1 beträgt.
  5. Die Polymerdispersion gemäß einem der Ansprüche 1 bis 4, wobei die Viskosität der Polymerdispersion direkt nach oder ein Monat nach der Herstellung 30 bis 1500 mPa·s beträgt.
  6. Die Polymerdispersion gemäß einem der Ansprüche 1 bis 5, wobei das die Dispergierfähigkeit beibehaltende Mittel Dimethyldiallylammoniumchlorid-(Co)polymer ist.
  7. Die Polymerdispersion gemäß einem der Ansprüche 1 bis 5, wobei das die Dispergierfähigkeit beibehaltende Mittel ein mit Alkylgruppen substituiertes und/oder ein mit Aralkylgruppen substituiertes Polyethylenpolyamin ist.
  8. Die Polymerdispersion gemäß Anspruch 7, wobei das die Dispergierfähigkeit beibehaltende Mittel ein mit Alkylgruppen substituiertes und/oder ein mit Aralkylgruppen substituiertes Pentaethylenhexamin ist, wobei die Alkylgruppe mindestens 5 Kohlenstoffatome hat.
  9. Papierverstärkungsverfahren, umfassend die Schritte: Verdünnen der Polymerdispersion gemäß einem der Ansprüche 1 bis 8 mit Wasser, um eine verdünnte Dispersion mit einer Polymerkonzentration von mindestens 0,5 Gew.-% herzustellen, Beschichten oder Imprägnieren der verdünnten Dispersion auf ein trockenes Papier und Trocknen des behandelten trockenen Papiers.
  10. Papierverstärkungsverfahren, umfassend die Schritte: Verdünnen der Polymerdispersion gemäß einem der Ansprüche 1 bis 8 mit Wasser, um eine verdünnte Dispersion mit einer Polymerkonzentration von mindestens 0,25 Gew.-% herzustellen, Beschichten oder Imprägnieren der verdünnten Dispersion auf ein nasses Papier auf einem Drahtstück und Trocknen des behandelten nassen Papiers.
  11. Das Papierverstärkungsverfahren gemäß Anspruch 10, wobei die verdünnte Dispersion versprüht wird, um das nasse Papier zu imprägnieren.
  12. Das Papierverstärkungsverfahren gemäß einem der Ansprüche 10 und 11, wobei das mit der verdünnten Dispersion behandelte nasse Papier aus einer Schicht besteht.
  13. Papierverstärkungsverfahren, umfassend die Schritte: Verdünnen der Polymerdispersion gemäß einem der Ansprüche 1 bis 8 mit Wasser, um eine verdünnte Dispersion mit einer Polymerkonzentration von mindestens 0,5 Gew.-% herzustellen, Aufsprühen der verdünnten Dispersion auf eine Netzoberfläche, Herstellen einer Vielzahl von Netzen mit einem auf deren Oberflächen aufgebrachten Polymer und Pressen der Oberfläche der Netze, so dass sie übereinander liegen, gefolgt von Trocknen.
EP98111753A 1998-04-22 1998-06-25 Papierfestigungsmittel und Verfahren zur Festigung von Papier Expired - Lifetime EP0953679B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP12664398A JP3302642B2 (ja) 1998-04-22 1998-04-22 紙力増強剤および紙力増強方法
JP12664398 1998-04-22
JP17532898A JPH11350384A (ja) 1998-06-09 1998-06-09 紙用表面塗布剤
JP17532898 1998-06-09

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EP0953679A1 EP0953679A1 (de) 1999-11-03
EP0953679B1 true EP0953679B1 (de) 2002-09-11

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CN101210403B (zh) * 2007-12-21 2010-08-11 陕西科技大学 一种全废纸瓦楞原纸的环压强度增效剂的制备方法
CN111566284A (zh) 2017-10-18 2020-08-21 索理思科技开曼公司 生产单层纸或多层纸的方法
EP3697963A1 (de) 2017-10-18 2020-08-26 Solenis Technologies Cayman, L.P. Verfahren zur herstellung von mehrlagigem papier

Citations (1)

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JPH0614907A (ja) * 1992-06-30 1994-01-25 Shimadzu Corp 光吸収を用いた計測装置

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Publication number Priority date Publication date Assignee Title
US2999038A (en) * 1958-01-24 1961-09-05 Rohm & Haas Method of producing wet-strength papers
DE3012002A1 (de) * 1980-03-28 1981-10-08 Wolff Walsrode Ag, 3030 Walsrode Verfahren zum veredeln von papier, pappe und karton
JPS60185900A (ja) * 1984-03-01 1985-09-21 星光化学工業株式会社 製紙方法
JPH0751652B2 (ja) * 1988-12-12 1995-06-05 ハイモ株式会社 アクリル系重合体分散液の流動性保持方法
US5708071A (en) * 1994-12-15 1998-01-13 Hymo Corporation Aqueous dispersion of an amphoteric water-soluble polymer, a method of manufacturing the same, and a treating agent comprising the same

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
JPH0614907A (ja) * 1992-06-30 1994-01-25 Shimadzu Corp 光吸収を用いた計測装置

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NO323070B1 (no) 2006-12-27
DE69807843T2 (de) 2003-05-28
NO983091L (no) 1999-10-25
NO983091D0 (no) 1998-07-03
DE69807843D1 (de) 2002-10-17
TWI224641B (en) 2004-12-01
RU2146317C1 (ru) 2000-03-10
EP0953679A1 (de) 1999-11-03

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