• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    16 ABSTRACT The present invention relates to a surface treatmentcomposition for paper, paperboard or other fibrous webswherein the composition comprises starch particles thatcomprise at least one salt, The invention further relatesto a paper or paperboard being surface treated with said composition.
    公开号:SE1051056A1
    申请号:SE1051056
    申请日:2010-10-08
    公开日:2012-04-09
    发明作者:Philip Haakansson；Kaj Backfolk
    申请人:Stora Enso Ab；
    IPC主号:
    专利说明:

    SURFACE TREATMENT COMPOSITION AND PAPER OR PAPERBOARDCOMPRISING A SURFACE TREATMENT COMPOSITION.
    TECHNICAL FIELD The present invention relates to a surface treatmentcomposition comprising starch particles, intended for thecoating or surface sizing of paper, paperboard or otherfibrous webs. The invention also relates a paper or paperboard comprising said composition.
    BACKGROUND OF THE INVENTIONThe predominant part of all paper and paperboard that isinkjet to be used in copying machines, laser printers, printers and other different printing methods such as offset printing and flexoprinting, is surface treated with some sort of composition in order to improve printabilityas well as other properties of the paper or paperboard. Thecomposition is often either a surface sizing composition or a coating color.
    If the composition mainly comprises starch in a dissolved the surface treatment composition is called a surface form,sizing. If the composition contains some sort of pigment inthe form of solid particles, the composition is called a pigmentation composition or a coating color.
    Surface sizing compositions mainly consists of modifiedstarches or other hydrocolloids or surface sizing agents.
    Furthermore, surface sizing improves the surface strength and printability of the paper or paperboard surface.
    Compositions containing pigments, i.e. pigmentation compositions or coating colors, are most often used to improve the printability of the paper. Moreover, the smoothness of the surface of the paper or board isimprovement and the control of printing ink absorption canbe improved. The colorant of the ink should mainly beabsorbed on the surface of the paper and the solvent of theink should be penetrated into the paper. To these advantages may be added that the paper exhibits an improved “f@@iing”.
    A conventional coating color usually contains an inorganic pigment that most often consists of calcium carbonate and/or clay. Other pigments exist too, such as e.g. silicon dioxide and in rare occasions, organic pigments such as plastic pigments. Besides plastic pigments, the paste also contains a binding agent that canconsist of dissolved starch and/or a synthetic binding agent. Examples of common synthetic binding agents are styrene butadiene latex and acrylate latex.
    Inkjet printing, puts high demands on a printing paper,since the ink must be quickly dried on the substrate ande.g. a high optical minimized feathering and bleeding and low yet provide a high print quality with,print density,strike-through. In recent years it has been found that when multivalent salts, such as calcium chloride, are added to the surface size, the applied ink will precipitate fast onthe surface of the paper and give rise to a significantin print quality. This is especially US6207258 discloses a improvementadvantageous in inkjet printing.composition useful for surface treating a sheet substrate for inkjet printing, the composition comprising a salt of a divalent metal.
    Multivalent cations, e.g, calcium, are sometimes added tosizing or coating compositions in the form of lubricants,the concentration of calcium stearate. However, e.g. calcium, calcium stearate is not high enough to in e.g.give rise to the desired effects on the print quality.Therefore, the calcium amounts needs to be higher than traditionally used in such products.
    One problem with the addition multivalent salts tocoating and/or sizing compositions is that the highconcentration of salt needed in order to achieve thedesired effects oftentimes causes rheology problems andThis is especially a problem when is added to undesired precipitations. high amounts, such as l~5 parts of salt, anionically charged sizing, pigmentation or coating compositions. Multivalent cations interact strongly with typical anionic-charged polymers or minerals, or additives which are used in papermaking. Improvement in calciumstability of anionically charged particles can e.g. beimproved by providing steric or electrosteric stability.
    However, high amounts of electrolytes may cause colloidal flocculation and precipitation.
    Ink-jet printing can be done with different types of inks, either dye-based inks, pigment based inks or inks based on the combination of pigment and dye. Starch, especially cross-linked starch, improves the printing properties of a paper or paperboard when printed with dye-used as a surface treating based inks. Cross~linked starch composition is described in for example WOO302lO39. The printing properties for pigment based inks improves by the presence of metal salts.
    It is an object of the present invention to find asolution to the problem of adding additives, such as saltsof multivalent metals, to surface sizing and/or coating orpigmentation compositions without disturbing therheological profile of the composition at the same time asit improves the printing properties of both dye-based and pigment based inks.
    SUMMARY OF THE INVENTION The above object, and other advantages, is achieved by the surface treatment composition of the present invention.
    The present invention relates to a surface treatmentcomposition for paper, paperboard or other fibrous webswherein the composition comprises starch particles that comprise at least one salt.
    The at least one salt is preferably incorporated in thestarch particle. In this way it is possible to increase theamount of salt added to a surface treatment composition and also to the surface of a paper or paperboard.
    The at least one salt is preferably a salt of amultivalent metal, such as a divalent or trivalent metal.The salt is preferably a calcium, magnesium or aluminumsalt, preferably calcium chloride or polyaluminum chloride.The starch is preferably cross-linked starch. By usingcross-linked starch in a surface treatment composition itis possible to subject the composition and/or the starch toelevated temperature without dissolving the entire amount of starch particles. In this way the starch particles tend to stay on the surface of a treated paper or paperboard and thus not being absorbed into the paper or paperboard: This improves the printing properties of the paper orpaperboard. Another advantage with the cross-linked starchis that the absorption of the printed ink is improved. Itis important that the colorant of the ink is absorbed and mainly kept on the surface of the paper and that the solvent, i.e. water or ink solvent, is quickly released by the composition and absorbed by the paper. Due to the improved absorption of the composition it is also possible increase the amount of ink added to the paper or paperboard. The paper or paperboard is thus not as sensitive to large amount of ink, which makes it possible to improve the printing quality of prints demanding high amounts of ink, such as pictures. Also, some solvent of inks demands cross-linked polymers in order to work properly.
    The starch is preferably cross-linked by one or morecompounds chosen from the group that consists of methylamine compounds, polyvalent acids, polyvalent acid esters, polyvalent acid halides, polyvalent acid anhydrides, polyaldehydes, polyepoxides, polyisocyanates, divinyl compounds, phosphoryl chloride, polyamine polyepoxide resin, l,4-butane diolglycidyl ether, epichlorohydrin, trimetaphosphates, mixtures of anhydrides of acetic acid and two and three protonic acids, sodium hypochlorite, or mixtures thereof.
    The composition preferably comprises starch particles inan amount of more than 65% by weight, and at least lO% byweight of the starch in the composition consists of starchparticles in the entire temperature range of 20-50°C. Both bulk and stiffness of the treated paper or paperboard is improved when starch in the form of particles is present in the composition.
    The ratio between the salt and starch of the compositionis preferably between l:5O to l:5. There is an optimalamount of both starch and salt in the composition. More orless starch respectively salt will deteriorate ink-jet printing properties of the paper or paperboard.
    The composition preferably comprises dissolved starch.The dissolved starch will work as a binder of thecomposition.
    The composition may also comprise an additive, preferablyan anionic or amphoteric additive which will modify thestarch particles. In this way it is possible to alter the charge of the particles making them more stable or more compatible to other additives or to the fibers.
    The invention also relates to a paper or paperboardproduct comprising a surface layer of a surface treatment composition as described herein.
    DETAILED DESCRIPTION OF THE INVENTION The surface-treatment composition of the presentinvention comprises starch particles encapsulating at leastone salt. The salt can be said to be trapped in the starchparticle. The use of such particles in a surface treatmentcomposition increases the printing properties of both dyebased and pigment based inks. Also, such compositiondecreases rheology and viscosity problems that areconnected with prior art compositions comprising as high concentrations of salt as the inventive composition.
    Consequently, higher concentrations of the salts in asurface treatment composition may be used without causing rheology or viscosity problems.
    By addition of the surface treatment compositionaccording to the invention to a surface of a paper orpaperboard, it is possible to increase the amount of salton the surface of the paper or paperboard at the same timeas the amount of salt, seeing to the entire paper orpaperboard, is decreased compared to prior art solutions.This is due to that the surface treatment composition andthus also the salt of the composition is, to a largerextent, retained on the surface of the paper or paperboard.The added salt is thus not absorbed into the paper orpaperboard making it possible to decrease the amount ofsalt added in order to achieve the desired amount of salt on the surface and thus also good printing properties.
    Another advantage with the present surface treatmentcomposition is that it improves the printing properties ofa paper or boards since the colorant of the ink which isprinted is absorbed on the surface and thus not absorbed bythe treated paper or paperboard. The cross~linked starchwill absorb the ink and since the starch is added andretained on the surface of a paper or paperboard the ink isthus also retained on the surface and not absorbed furtherinto the paper or paperboard. Furthermore, the ink willalso come in contact with the incorporated salt since thestarch particle will absorb the ink and the ink will thusget in contact with the salt within the starch particle.This also improves the printability since the ink is absorbed on the surface of the paper or paperboard. In this way the surface treatment composition is suitable for both dye based and pigment based inks.
    The composition preferably also comprises dissolved starch. The dissolved starch will work as a binder. As a consequence of the dissolved starch, the composition willalso comprise dissolved salt that is released when thestarch is dissolved. The dissolved salt will improve theprinting properties of a treated paper or paperboard in the same way as metal salts used in prior art, i.e. when saltis added as a separate component to a paper or paperboardthe dissolved salt will also decrease surface. Furthermore, the viscosity of the composition which makes it possible to increase the dry content of the composition.
    The surface treatment composition can be seen as both a surface sizing composition and a coating color. The surface treatment composition according to the invention preferablycomprises both dissolved starch as well as starchthe composition gives both sizing particles. Consequently, and coating properties to the treated paper or paperboard.
    The salt is preferably a salt of a multivalent metal, such as a divalent or trivalent metal salt, for example calcium, magnesium or aluminum salt, which is added. It is preferred to use calcium chloride or polyaluminiumchloride. Use of particles comprising multivalent metalssalts according to the invention, render it possible todose a higher concentration of multivalent metals salt to asizing or a coating composition without effecting the the rheology of the composition negatively. In this way, printability of the sized or coated paper or board can be improved. Moreover, use of the particles according to the invention also reduces the concentration of the free anion of the multivalent salt, e.g. a chloride ion, in the composition whereby the risk of corrosion is reduced.The starch particle is preferably cross-linked. The dry starch particles is preferably of a size of between l-1000 um , even more preferably between l~l00 um. It ispreferred that the starch particle is a cross-linked starchgel. At none or a very low degree of cross-linking, the starch dissolves if a starch slurry is heated. At anincreased degree of cross-linking the amount of the starch that dissolves decreases. The starch used in the invention may have very different degrees of cross-linking. From a O relatively low degree of cross-linking, in which about l0 6 by weight (by total weight of the composition) of the starch exist as solid particles at a temperature of about to 50 °C, and the rest of the starch constitutes a binder in dissolved form, to a high degree of cross~ linking, where about 100 % of the starch exist as solid particles in the temperature interval given above. lt is O preferred that at least l5 %, preferably at least 20 6 by weight (by total weight of the composition) of the starch content of the composition at about 20 to 50 °C isconstituted by starch particles according to the invention.It should be noted that what has just been stated is not contradictory to the limitation that more than 65 % by weight (by total weight of the composition) of the solids content should be starch particles, given that the solid pigments of the composition are essentially only composedof these starch particles or only at very small amounts comprise other types of pigments. Independent of the cross- linking degree, the composition may also contain other types of soluble starch or some synthetic polymer, in order to obtain an adequate amount of binder and further improved printability properties. Examples of such polymers are styrene-acrylate, styrene maleic acid anhydride, polyvinylalcohol, polyvinylpyrrolidon, polyvinylformamide.
    The starch may also be cross-linked fragmented starch.
    The starch is preferably based on potato, maize, wheat, waxy maize, rice or tapioca. The starch may be non-ionic or ionic for example anionic, cationic or amphoteric.
    In order to further improve the paper properties that have been mentioned above, e.g. printability, the starch may be additionally modified. The starch may be modified to act as cation active, anion active, amphoteric or hydrophobic. Cationic cross-linked starch may react better with dye-based inks which is anionic.
    Preferably, the starch exhibits a degree of substitution of 0.01 ~ 0.30 and even more preferred 0.02 ~ 0.20.Uncharged starch too may however work according to the invention.
    According to one aspect of the invention, the surface treatment composition may also comprise a minor amount of other pigments in the form of solid particles. Such pigments may e.g. be constituted by calcium carbonate, clay, silicon dioxide and/or aluminum oxide. It is however also conceivable, and in many cases preferable, that the solid content of the composition is essentially onlyconstituted by the inventive starch particles. The composition may also comprise surfactants. 11 The composition may also comprise an additive, preferably a charged additive which makes it possible to alter thecharge of the starch particle in a desired way. Theadditive may preferably be anionic or amphoteric. By theaddition of the additive to the composition comprisingstarch particles the particles will be modified. It is thuspossible to modify the starch particles in order to makemake them more compatible with the fibers The them more stable,or with other components normally used in papermaking. additive may preferably be carboxymethyl cellulose (GMC), polyvinyl alcohol, anionic galactoglucomannan, anionic starch, polyphosphoric acid, alginate polyacrylic acid, protein, anionic polyacryl amide, anionic silica, papermakers alum and polymethacrylic acid. the composition according to the invention bulk, Furthermore, also improves brightness, opacity, surface smoothnessand air resistance of a sized or coated paper orpaperboard. One reason to this is that the starch particlesof the surface treatment composition are amorphous and thatthey thereby have a much larger specific surface thanconventional pigments. The high specific surface of thecomposition is probably also the reason for the improvedprinting properties of the paper when inkjet printers areused as the absorption of ink into the paper is improveddue to an increased number capillaries having a smallerradius. This large surface also advantageously absorbs printing ink in offset printing. Furthermore, it has been observed that the starch particles, even if being nongelatinised, exhibit an advantageously sticky surface.The invention further relates to a paper or paperboard product comprising the surface treatment composition 12 described above. The paper or paperboard is especiallysuitable for printing with flexographic or digital printingtechniques, such as inkjet, electrophotography, liquidtoner or electrostatic printing. An big advantage with thecomposition according to the invention is that it can be used for both dye-based and pigment based inks. Forexample, it is suitable for hybrid printed products, inwhich one of the printing methods is based on pigmentedthe invention is also water based inkjet inks. Moreover, applicable for hybrid inks, which here relates to inks containing both dye and pigment particles.
    The addition of the surface treatment composition to asurface of a paper or paperboard may take place in anyIt is for example possible to transfer blade conventional way.the composition to the surface by rod coating,spray coating or other known coating, fountain coating, coating techniques.
    The salt may be incorporated in the starch particle inseveral different ways. The salt may be incorporated in thestarch particles before or after the cross-linking of thestarch. If cross-linked fragmented starch is used, the saltmay be incorporated before or after the fragmentation of the starch.
    It is possible that cross-linked starch particlesalternatively cross-linked fragmented starch may be addedto a solution comprising dissolved salt. The starchparticle will swell in the solution and dissolved salt isthus absorbed and thus incorporated by the starch particles forming the particles according to the invention. 13 Another possibility for production of starch particles isduring the production of cross-linked starch, the salt canthus be added in liquid or solid state just before theextruder which is used for the production of cross~linkedthe pressure and/or temperature is starch. If necessary, raised during the extrusion, A third way to incorporate the salt in the starchparticles, is to add the salt to a starch slurry and treated in a jet cooker. In a jet cooker, the temperatureand pressure is raised by adding direct steam into thecooker. ln this way starch particles comprising salt is formed.
    The invention may beneficially be used for papers ofdifferent types, such as paper for inkjet printers,copying paper, paper for laser printers or other types of paper or paperboard. envelope paper,It is also possible toadd the composition to a non-fibrous material, such as abiopolymer film preferably located on the surface of a fibrous material.
    The invention is not limited to the describedembodiments, but may be varied within the scope of the claims.
    权利要求:
    Claims (11)
    [1] 1. l. A surface treatment composition for paper, paperboard or other fibrous webs, characterized in that the composition comprises starch particles wherein the starch particles comprise at least one salt.
    [2] 2. The composition according to claim 1, characterized in that the salt is incorporated in the starch particle.
    [3] 3. The composition according to any of claims l or 2,characterized in that the at least one salt is a salt of a multivalent metal, such as a divalent or trivalent metal.
    [4] 4. The composition according to any of the preceding claims, characterized in that the salt is a calcium, magnesium or aluminum salt, preferably calcium chloride or polyaluminum chloride.
    [5] 5. The composition according to any of the precedingclaims characterized in that the starch is cross-linked starch.
    [6] 6. The composition according to claim 5, characterized in that the starch is cross-linked by one or more compoundschosen from the group that consists of methylamine compounds, polyvalent acids, polyvalent acid esters, polyvalent acid halides, polyvalent acid anhydrides, polyaldehydes, polyepoxides, polyisocyanates, divinyl compounds, phosphoryl chloride, polyamine polyepoxide resin, 1,4-butane diolglycidyl ether, epichlorohydrin, trimetaphosphates, mixtures of anhydrides of acetic acid and two and three protonic acids, sodium hypochlorite, or mixtures thereof.
    [7] 7. The composition according to any of the precedingclaims characterized in that the composition comprisesstarch particles in an amount of more than 65% by weight,and at least 10% by weight of the starch in the compositionconsists of starch particles in the entire temperature range of 20-50°C.
    [8] 8. The composition according to any of the precedingclaims characterized in that the ratio between salt and starch of the composition is between 1:50 to 1:5.
    [9] 9. The composition according to any of the precedingclaims characterized in that the composition comprises dissolved starch,
    [10] 10. The composition according to any of the precedingclaims characterized in that the composition comprises an additive, preferably an anionic or amphoteric additive.
    [11] 11.Paper or paperboard, characterized in that itcomprises a surface layer comprising the surface treatment composition according to any one of claims 1-10.
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    同族专利:
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1051056A|SE535500C2|2010-10-08|2010-10-08|Surface preparation composition and paper or paperboard containing a surface treatment composition|SE1051056A| SE535500C2|2010-10-08|2010-10-08|Surface preparation composition and paper or paperboard containing a surface treatment composition|
    CN201180048700.2A| CN103154371B|2010-10-08|2011-10-04|Surface treating composition and the Paper or cardboard comprising surface treating composition|
    ES11831005T| ES2751096T3|2010-10-08|2011-10-04|Paper or cardboard surface treatment composition comprising a surface treatment composition|
    PCT/SE2011/051182| WO2012047162A1|2010-10-08|2011-10-04|Surface treatment composition and paper or paperboard comprising a surface treatment composition|
    EP11831005.1A| EP2625337B1|2010-10-08|2011-10-04|Surface treatment composition and paper or paperboard comprising a surface treatment composition|
    BR112013008470-7A| BR112013008470B1|2010-10-08|2011-10-04|surface treatment composition and paper or cardboard comprising a surface treatment composition|
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