WO2001029313A1 - Polysaccharides a modification cationique - Google Patents

Polysaccharides a modification cationique Download PDF

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Publication number
WO2001029313A1
WO2001029313A1 PCT/US2000/024561 US0024561W WO0129313A1 WO 2001029313 A1 WO2001029313 A1 WO 2001029313A1 US 0024561 W US0024561 W US 0024561W WO 0129313 A1 WO0129313 A1 WO 0129313A1
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WIPO (PCT)
Prior art keywords
cationic
furnish
starch
retention aid
surface charge
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PCT/US2000/024561
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English (en)
Inventor
Michael D. Vrbanac
Sherry L. Thomson
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Weyerhaeuser Company
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Publication date
Application filed by Weyerhaeuser Company filed Critical Weyerhaeuser Company
Priority to CA002386403A priority Critical patent/CA2386403A1/fr
Priority to AU71221/00A priority patent/AU7122100A/en
Priority to MXPA02003881A priority patent/MXPA02003881A/es
Priority to KR1020027004984A priority patent/KR20020060204A/ko
Priority to JP2001532287A priority patent/JP2003512541A/ja
Publication of WO2001029313A1 publication Critical patent/WO2001029313A1/fr
Priority to SE0201183A priority patent/SE521309C2/sv

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L3/00—Compositions of starch, amylose or amylopectin or of their derivatives or degradation products
    • C08L3/04—Starch derivatives, e.g. crosslinked derivatives
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D21H17/28—Starch
    • D21H17/29—Starch cationic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B31/00—Preparation of derivatives of starch
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B31/00—Preparation of derivatives of starch
    • C08B31/08—Ethers
    • C08B31/12—Ethers having alkyl or cycloalkyl radicals substituted by heteroatoms, e.g. hydroxyalkyl or carboxyalkyl starch
    • C08B31/125—Ethers having alkyl or cycloalkyl radicals substituted by heteroatoms, e.g. hydroxyalkyl or carboxyalkyl starch having a substituent containing at least one nitrogen atom, e.g. cationic starch
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L3/00—Compositions of starch, amylose or amylopectin or of their derivatives or degradation products
    • C08L3/02—Starch; Degradation products thereof, e.g. dextrin
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L79/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen or carbon only, not provided for in groups C08L61/00 - C08L77/00
    • C08L79/02—Polyamines
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2666/00—Composition of polymers characterized by a further compound in the blend, being organic macromolecular compounds, natural resins, waxes or and bituminous materials, non-macromolecular organic substances, inorganic substances or characterized by their function in the composition
    • C08L2666/02—Organic macromolecular compounds, natural resins, waxes or and bituminous materials
    • 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
    • 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

Definitions

  • the present invention relates to modified polysaccharide as a filler and strengthening aid for paper and board products and, more particularly, to modified polysaccharide having enhanced surface charge.
  • starch is fully cooked and used at a size press.
  • Size press starch can include additives that impart desirable properties to a paper or board such as improved printing, stiffness, bond, dusting, surface pick, among others.
  • Cationic starch is typically added at the papermachine wet end and can improve a paper's strength properties and fine particle retention.
  • Other charged synthetic polymers can be combined with cationic starch to improve overall fine particle retention.
  • Raw uncooked and unmodified starch particles are not added to the wet end of a paper machine due to their unacceptably low retention.
  • Raw starch has a particle surface charge near zero when slurried in water. This lack of surface charge results in a weak interaction with charged retention aids and/or fibers. Without strong interaction (e.g., chemical attachment), starch cannot be retained well in a papermaking system. Mechanical filtration of starch particles can result in some starch retention in a fibrous web, but such retention requires a specific type of headbox configuration.
  • the present invention provides a modified polysaccharide having enhanced surface charge.
  • the polysaccharide of the invention is a polysaccharide that has been modified to include a cationic polymer.
  • the modified starch formed in accordance with the present invention has a surface charge from about +5 to about +20 mV.
  • the modified polysaccharide can be advantageous incorporated into a papermaking furnish with enhanced retention.
  • paper products that include the modified polysaccharide having enhanced surface charge are provided. Paper products that include the modified polysaccharide have increased strength compared to similarly constituted paper products that do not include the modified polysaccharide.
  • the paper product includes cellulosic fibers and the modified polysaccharide.
  • the paper product in addition to cellulosic fibers and modified polysaccharide, the paper product further includes a retention aid that enhances the retention of the modified polysaccharide to the fibers.
  • the retention aid can be either a positively or a negatively charged retention aid.
  • the invention provides methods for forming the modified polysaccharide having enhanced surface charge and methods for forming paper products having increased filler retention and increased strength through the incorporation of the modified polysaccharide.
  • FIGURE 1 is a schematic illustration of a representative modified polysaccharide formed in accordance with the present invention.
  • the present invention provides polysaccharide having enhanced surface charge.
  • the polysaccharide has been modified to include a cationic additive that imparts a positive charge to the polysaccharide surface.
  • a cationic additive that imparts a positive charge to the polysaccharide surface.
  • polysaccharide and starch are interchangeable, and the terms “modified starch” and “modified polysaccharide” refer to a polysaccharide having enhanced surface charge formed in accordance with the present invention.
  • Suitable cationic additives include materials that can be irreversibly and/or strongly associated with starch and, when associated with starch, enhance its surface charge.
  • Cationic additives include cationic organic polyelectrolytes and polymers.
  • the cationic additive includes a cationic polymer such as a polyquaternary amine.
  • the cationic additive is a relatively low molecular weight, highly positively charged polyquaternary amine having a molecular weight in the range from about 1 to 5 million grams per mole and about 3 milliequivalents quaternary amine per gram.
  • Such a polyquaternary amine is commercially available under the designation Nalco 7527 from Nalco Chemical Co., Naperville, IL.
  • the cationic additive is present on the starch in an amount from about 1 to about 15 pounds/ton starch on a dry basis and, preferably, about 5 pounds/ton starch.
  • cationic additives that are useful in forming the modified starches of the invention include cationic polyacrylamides, aluminum sulfate, chitosan, polyamines, polyamidoamines, polyethylenimines, polyamide-epichlorohydrin (PAE), polyalkylene polyamine-epichlorohydrin (PAPAE), and amine polymer-epichlorohydrin (APE).
  • PAE polyamide-epichlorohydrin
  • PAPAE polyalkylene polyamine-epichlorohydrin
  • APE amine polymer-epichlorohydrin
  • the modified starch formed in accordance with the present invention has a surface charge in the range from about +1 mV to about +100 mV and, preferably from about +5 to about +20 mV as determined by the zeta potential measurement.
  • Starches from a variety of sources can be modified to provide starches having enhanced surface charge. Suitable starches are available from corn, potato, tapioca, pea and wheat, among other sources.
  • the modified starch of the invention can be formed from a slurry of raw uncooked starch and cationic additive in water.
  • raw uncooked starch is added to pH 10 water to provide a slurry having about 7% solids.
  • the starch swells in the alkaline solution which appears as a milky paste. Although swelling occurs, the starch remains in the form of discrete particles. However, at higher pH, the starch can gel as a result of denaturation (i.e., chemical cooking). Gelatinization during modified starch formation is to be avoided.
  • denaturation i.e., chemical cooking
  • modified starch particle 10 includes cationic additives 12 adhered to starch particle 14.
  • Example 1 The preparation and properties of representative modified starches having enhanced surface charge are described in Example 1.
  • Example 2 The measurement of the surface charge of representative surface charged enhanced starch particles formed in accordance with the present invention is described in Example 2.
  • the modified starch of the invention can be advantageously incorporated into a papermaking furnish. As described below, the modified starch is highly retained by pulp thereby rendering the modified starch an economic filler for paper products. Moreover, the paper products that incorporate the modified starch pulp have improved strength.
  • modified starch in pulp is increased compared to raw uncooked starch.
  • Britt Jar experiments demonstrated that the modified starch can be retained by pulp to an equal or greater extent compared to precipitated calcium carbonate (PCC), a conventional filler.
  • PCC precipitated calcium carbonate
  • the modified starch can be highly retained by pulp to provide a pulp that can yield a paper product having high filler retention.
  • other retention aids can be added to the pulp to further increase modified starch retention.
  • Retention aids include those known in the papermaking art and the anionic and cationic retention aids described below.
  • An anionic retention aid or additive can be utilized to increase modified starch retention.
  • Anionic retention aids include anionic organic polyelectrolytes and polymers.
  • the anionic retention aid includes an anionic polymer such as, for example, anionic polyacrylamide (APAM).
  • APAM anionic polyacrylamide
  • the anionic retention aid is a relatively high molecular weight, slightly negatively charged polyacrylamide.
  • the preferred polyacrylamide has a molecular weight in the range from about 8 to about 15 million grams/mole and is a copolymer of acrylic acid (30 mole percent) and acrylamide (70 mole percent).
  • Such a polyacrylamide is commercially available under the designation Accurac 171 from Cytec Industries Inc., West Patterson, NJ.
  • the anionic polyacrylamide is commercially available under the designation Nugen 24 from Northwest Specialty Chemicals, Vancouver, WA.
  • the anionic retention aid is present in the fibrous pulp in an amount from about 0.1 to about 3.0 pounds/ton fiber and, preferably, about 0.5 pounds/ton fiber.
  • anionic retention aids include high molecular weight anionic flocculants.
  • a representative anionic retention aid e.g., APAM
  • APAM anionic retention aid
  • Table 9 the greatest retention (72 percent by weight) was achieved with the addition of the APAM to the pulp followed by the addition of the modified starch.
  • the cationic retention aid includes a cationic polymer such as, for example, a cationic polyacrylamide (CPAM), which has a relatively high molecular weight and is slightly positively charged.
  • CPAM cationic polyacrylamide
  • the preferred polyacrylamide has a molecular weight in the range from about 8 to about 15 million grams/mole and is a copolymer of acrylamide (90 mole percent) and a quaternary amine monomer (10 mole percent).
  • a polyacrylamide is commercially available under the designation Accurac 182RS from Cytec Industries Inc., West Patterson, NJ.
  • the cationic retention aid is present in the fibrous pulp in an amount from about 0.1 to about 12 pounds/ton fiber and, preferably, from about 0.4 to about 6 pounds/ton fiber.
  • Combinations of anionic and cationic retention aids can be used with the modified starch to increase pulp retention.
  • Other suitable cationic retention aids include high molecular weight cationic flocculants such as, for example, cationic polyacrylamides commercially available from Nalco Chemical Co., Naperville, IL under the designations Nalco 7530 and 7520.
  • Pulps containing the highly retained modified starches can be formed into paper products characterized by having advantageously high filler retention and increased strength.
  • Paper products that benefit from the advantageous incorporation of the modified starch include fine paper, newsprint, bleached board, liner board, medium board, and old corrugated cardboard (OCC), among others.
  • Paper products containing modified starch and, optionally, one or more of the retention aids described above can be formed by adding the modified starch and, if desired, the retention aid(s), to a pulp furnish at the wet end of a papermaking machine.
  • the modified starch can be added to the pulp furnish in an amount from about 0.5 to about 20 percent by weight, and preferably from about 3 to about 10 percent by weight based on the total weight of fibers.
  • the flow characteristics of a pulp furnish, including the furnish' s ability to be dewatered, is an important factor in high speed papermaking methods and machines.
  • One advantage of the invention is that the addition of modified starch to a pulp furnish does not adversely affect the furnish' s flow characteristics despite the furnish' s high retention of modified starch. Furthermore, the furnish is not adversely affected by the addition of the modified starch when the pulp is treated with an anionic retention aid in accordance with the invention.
  • the wet end addition of the modified starch to a pulp furnish treated with an anionic retention aid does not result in the formation of a gumlike precipitate, which would negatively impact the quality of the pulp furnish and limit its utility in high speed papermaking.
  • the addition of a cationic retention aid to a pulp furnish containing an anionic retention aid and/or modified starch does not adversely affect the pulp furnish.
  • Example 4 The formation and properties of a representative paper product, OCC, containing modified starch is described in Example 4.
  • the strength properties of the representative OCC product is summarized in Table 11.
  • the results demonstrate that the Mullen burst strength for an OCC product containing 3 percent by weight modified starch is increased by about 20% compared to a similarly constituted OCC product lacking modified starch. Increases in short span compression STFI, tensile, and stretch were also observed.
  • the OCC product had an increase in short span compression STFI of about 5%, an increase in tensile of about 9%, and an increase in stretch of about 16% compared to a similarly constituted OCC product lacking modified starch.
  • Representative OCC products were also formed varying (a) the amount of cationic additive used to prepare the modified starch, (b) the amount of modified starch added to the pulp furnish, and (c) the type and amount of retention aid(s) added to the pulp furnish.
  • the percentage starch retention results for various representative OCC products is summarized in Table 12. Referring to Table 12, the results demonstrate that modified starch is highly retained by pulp and that modified starch retention can be increased through the use of retention aids.
  • the anionic retention aid provided an enhancement in retention greater than the cationic retention aid.
  • representative starches having enhanced surface charge are described.
  • the representative starches including a cationic polymer, a polyquaternary amine (PQA) were prepared as described for Set 1.
  • Representative starches including a polyquaternary amine and further including a retention aid (APAM) were prepared as described for Set 2.
  • a cationic potato starch (Accosize 80, commercially available from Cytec Industries Inc., West Patterson, NJ) was cooked at 3.85% solids in a laboratory cooker (44 g, 86% solids) in 1000 mL of deionized water.
  • a 0.1% solution of a representative cationic polymer (a low molecular weight, highly positively charged polyquaternary amine, PQA, commercially available under the designation Nalco 7527 from Nalco Chemical Co., Naperville, IL) was diluted to 0.1% actives (1.43 g diluted to 500 mL).
  • a 0.1% solution of a representative retention aid (a high molecular weight, slightly negatively charged polyacrylamide, APAM, commercially available under the designation Accurac 171 from Cytec Industries Inc., West Patterson, NJ) was diluted to 0.01%) actives (1.43 g diluted to 500 mL and diluted 10 times).
  • a representative retention aid a high molecular weight, slightly negatively charged polyacrylamide, APAM, commercially available under the designation Accurac 171 from Cytec Industries Inc., West Patterson, NJ
  • HWBK Hardwood bleached kraft pulp
  • HWBK Hardwood bleached kraft pulp
  • APAM 0.5 lb/ton (1.25 g of 0.01% solution).
  • starch solutions were added to the pulp samples.
  • 0.5 lb/ton APAM (1.25 g of 0.01 % solution) was then added and mixed. All six conditions were qualitatively analyzed using a microscope.
  • the first experiment was designed to qualitatively compare unmodified tapioca starch with the addition of cooked cationic potato starch or a cationic polymer, polyquaternary amine (PQA).
  • PQA polyquaternary amine
  • APAM anionic polymer
  • Starch Particles In this example, the measurement of the surface charge of representative starch particles having enhanced surface charge are described. The surface charged was determined by zeta potential measurement.
  • Sets 1 and 2 Control and Modified Starches. Unmodified tapioca starch was used for each test. To each starch sample (5.0 g) was added 50 mL pH 10 buffer solution and the solution was allowed to stand for one hour. After standing for one hour, 5 lb/ton (actives basis) PQA (Nalco 7527) was added to the starch and mixed well to provide the "modified sample". In the control sample, no polymer was added. The samples were allowed to stand for an additional hour before adjusting to pH 7 with 1 N sulfuric acid. The samples were allowed to stand for an additional hour prior to analysis.
  • Set 3 Modified Starches from pH Variance.
  • the modified sample was prepared by adding 5.0 g of unmodified tapioca starch in 50 mL of pH 10 buffer (as described above) and allowed to stand for one hour before adding 5 lb/ton PQA (Nalco 7527). After one hour, the pH was adjusted to pH 7 with 1 N sulfuric acid and allowed to stand for one final hour.
  • a second sample was prepared by adding pH 10 buffer to 5.0 g of tapioca starch as received and then allowed to stand. After the hour, 5 lb/ton PQA (Nalco 7527) was added and was allowed to stand for another two hours with no further pH adjustment.
  • a third sample was prepared as described above except that pH 7 buffer was added to the starch with no further pH adjustment.
  • the zeta potentials for all samples were measured using a Delsa 440 (Coulter Electronics, Inc., Hialeah, FL) run at a frequency range of ⁇ 500 Hz, and with a current equal to one-half the value of the conductivity of the sample.
  • the sample was run at two cell heights (16 and 84). Due to the addition of the PQA, the samples stayed fairly well dispersed and were allowed to settle for one hour prior to analysis.
  • the zeta potential results from the Set 1 samples are shown in Table 3. The charge is an average at 8.6, 17.1, 25.6, and 34.2° angles at both the 16 and 84 cell heights.
  • the control unmodified sample was run in triplicate and the modified sample was run in duplicate. The results demonstrate that the addition of the cationic polyacrylamide gave the modified sample a significantly enhanced charge compared to the control.
  • Table 3 Starch zeta potential measurement results
  • the zeta potential results from the Set 2 samples are shown in Table 4. Because settling in a zeta potential cell can shift the stationary plane, an experiment was conducted testing samples of various consistency to determine the effect on the charge analysis. The consistencies were varied by varying settling times of the starch slurries prior to analysis. The same samples were prepared as with the first set, and included a control and a modified sample. The modified sample was also washed with deionized water to determine whether the charge was on the particle surface or merely weakly associated with the surface.
  • results show that settling time does effect the zeta potential measurement.
  • results further indicate that the charge is on the particle surface and not merely weakly associated with the surface, and that washing the starch particles has an insignificant effect on zeta potential measurement.
  • Prince Albert hardwood was refined to a 400 mL CSF with the Escher Wyss conical refiner (Bird Escher Wyss, Manfield, MA) using the following conditions: 3.0%> consistency, 1.0 W-s/m specific edge load, 1250 rpm, 0.583 km/s cutting length, and 60 degree bar angle.
  • Prince Albert softwood was also refined to a 600 mL CSF with the Escher Wyss using the same conditions except that the specific edge load was 3.0 W-s/m.
  • the net power specific energy for the hardwood was 48.6 kW-h/t and for the softwood was 1.75 kW-h/t.
  • a pulp blend of 60% hardwood and 40%) softwood was prepared. The fines were removed using a 200 mesh screen box.
  • the final freeness value of the pulp mixture without fines was 695 mL at a 2.2% consistency.
  • Britt Jar Conditions A Britt Jar having a 100 mesh conical mesh screen was used in the retention determination. The pulp was added into a vaned Britt Jar with the stopper close and mixed with the starch at various speeds. After time had elapsed for sampling, the stopper was opened and the filtrate was collected in a tared aluminum pan (around 100 mL). The pan was immediately weighed on the same four-place balance that was used for the tare. The pan was put into a 105°C oven until the following day. The dried sample was placed into a desiccator before reweighing the pan. The consistency of the unretained slurry was calculated from Equation 1.
  • the pulp prepared as described above was diluted to 0.65% consistency with deionized water.
  • Precipitated calcium carbonate (PCC) was obtained from Specialty Minerals, Inc., Bethlehem, PA and had 31.6% solids.
  • a highly charged, high molecular weight anionic polyacrylamide (APAM, Accurac 171) solution was prepared by diluting 1.43 g APAM to 500 mL with deionized water. The solution was mixed with a Braun hand blender for fifteen seconds to provide a 0.1% APAM solution and then diluted 10X by diluting 50 mL of 0.1 %> to 500 mL with deionized water to provide a 0.01% solution.
  • a cationic potato starch (Accosize 80) solution was prepared by mixing 69.9 g of starch (86% solids) with 1340 mL of deionized water at 4.5% solid.
  • the 500 rpm data set provides effective retention while the higher mixing speed conditions show inadequate retention.
  • Modified Starch Retention The retention of the modified starch of the present invention was compared to a typical alkaline fine paper furnish with PCC.
  • the APAM and cationic starch solutions were prepared the same as described above.
  • a PQA solution (Nalco 7527) was prepared by diluting 1.43 g stock to 500 mL with deionized water. The PQA solution was 0.1%> actives and was mixed for fifteen seconds with a Braun hand blender. PCC was as described above. The pulp was diluted to 0.42%> consistency with deionized water.
  • the modified starch was prepared by diluting 5.0 g (12.5% solids) of unmodified tapioca starch to 50 mL with pH 10 buffer solution. The starch was well mixed and allowed to stand for one hour. A volume of 12.5 mL of 0.1%> PQA (Nalco 7527) was added and mixed well. The solution was allowed to stand for another hour. The pH was then adjusted to pH 7 with 1 N sulfuric acid (about 2.7 mL). The final consistency of the starch solution was 6.7%.
  • the control starch was prepared by diluting 5.0 g (12.5%o solids) of unmodified tapioca starch to 50 mL with pH 10 buffer solution. The starch was mixed well and was allowed to stand for one hour.
  • the filler (modified starch or PCC) retentions are summarized in Table 9.
  • Modified Starch pH 10-7 Five grams (12.5%> solids) of unmodified tapioca starch was diluted to 50 mL with pH 10 buffer solution. The starch was mixed well and was allowed to stand for one hour. A volume of 12.5 mL of 0.1%> Nalco 7527 was added and mixed well. The solution was allowed to stand for another hour. The pH was then adjusted to pH 7 with 1 N sulfuric acid (about 2.7 mL). The solutions equilibrated for one more hour. The final consistency of the starch solution was 6.7%.
  • Modified Starch pH 10-10 Five grams (12.5% solids) of unmodified tapioca starch was diluted to 50 mL with pH 10 buffer solution. The starch was mixed well and was allowed to stand for one hour. A volume of 12.5 mL of 0.1%> Nalco 7527 was added and mixed well. The solution was allowed to stand for two hours. The final consistency of the starch solution was 6.7%>.
  • Enhanced Starch In this example, the formation and properties of old corrugated cardboard (OCC) containing modified starch is described. The properties of representative OCC products was determined and compared to OCC products that did not include modified starch.
  • OCC old corrugated cardboard
  • the OCC product was formed from a fibrous furnish containing 100 percent OCC.
  • Modified starch was prepared as described above by adding 5 lb PQA (Nalco 7527)/ton starch.
  • the pulp furnish was treated with 0.5 lb APAM (Accurac 171)/ton fiber followed by the addition of 3 percent by weight modified starch based on the total weight of fiber, and then 5 lb CPAM (Accurac 182RS)/ton fiber.
  • 5 lb CPAM Accurac 182RS
  • Sample 1 refers to an OCC product that was formed without the inclusion of modified starch and Sample 2 refers to an OCC product that includes 3 percent by weight modified starch based on the total weight of fiber.
  • SSC STFI and TEA refer to short span compression STFI and tensile energy adsorption, respectively.
  • the Mullen burst strength for OCC product Samples 1 and 2 represent an increase of about 20%> compared to similarly constituted OCC lacking modified starch. Increases in short span compression STFI, tensile, and stretch were also observed.
  • the OCC product containing modified starch had an increase in short span compression STFI of about 5%, an increase in tensile of about 9%, and an increase in stretch of about 16%> compared to a similarly constituted OCC product lacking modified starch.
  • Variable PQA refers to an OCC product prepared by pretreating the pulp furnish with 0.5 lb APAM (Accurac 171)/ton fiber prior to treatment with modified starch prepared from starch and variable amounts of PQA (Nalco 7527): A, B, C, and D refer to OCC products containing modified starch prepared from 1, 2, 3, 5, and 7 lb
  • Variable APAM refers to an OCC product prepared by pretreating the pulp furnish with variable amounts of APAM (Accurac 171) followed by treatment with modified starch prepared from starch and 5 lb PQA (Nalco 7527)/ton starch: E, F, and G refer to OCC products in which the pulp furnish was pretreated with 0.25, 0.50, and
  • APAM/PQA APAM refers to an OCC product in which the pulp furnish was pretreated with 0.25 lb APAM (Accurac 171), and then treated with modified starch prepared from starch and 5 lb PQA (Nalco 7527)/ton starch and 0.25 lb APAM (Accurac 17 l)/ton fiber;
  • APAM/PQA/CPAM refers to an OCC product in which the pulp furnish was pretreated with 0.25 lb APAM (Accurac 171), then treated with modified starch prepared from starch and 5 lb PQA (Nalco 7527)/ton starch followed by 2.0 lb CPAM (Accurac 182)/ton fiber;
  • Variable CPAM refers to an OCC product prepared by treating the pulp furnish with variable amounts of CPAM (Accurac 182) after treatment with modified starch prepared from starch and 5 lb PQA (Nalco 7527)/ton starch: H, I, and J refer to OCC products in which the pulp furnish was treated with 1.0, 2.0, and 3.0 lb CPAM (Accurac 182)/ton fiber;

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Abstract

La présente invention concerne un polysaccharide modifié présentant une augmentation de sa surface de charge. Le polysaccharide est modifié afin d'inclure un polymère cationique, de préférence une amine polyquaternaire, et obtenir une surface de charge allant d'environ +5 à environ + 20 mV. On peut avantageusement incorporer ce polysaccharide dans une composition de fabrication de papier à rétention améliorée.
PCT/US2000/024561 1999-10-19 2000-09-07 Polysaccharides a modification cationique WO2001029313A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
CA002386403A CA2386403A1 (fr) 1999-10-19 2000-09-07 Polysaccharide granulaire a charge de surface ameliore
AU71221/00A AU7122100A (en) 1999-10-19 2000-09-07 Cationically modified polysaccharides
MXPA02003881A MXPA02003881A (es) 1999-10-19 2000-09-07 Polisacaridos modificados cationicamente.
KR1020027004984A KR20020060204A (ko) 1999-10-19 2000-09-07 양이온성으로 변성된 다당류
JP2001532287A JP2003512541A (ja) 1999-10-19 2000-09-07 カチオン変性多糖類
SE0201183A SE521309C2 (sv) 1999-10-19 2002-04-19 Granulär polysackarid med ökad ytladdning

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US42162199A 1999-10-19 1999-10-19
US09/421,621 1999-10-19

Publications (1)

Publication Number Publication Date
WO2001029313A1 true WO2001029313A1 (fr) 2001-04-26

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PCT/US2000/024561 WO2001029313A1 (fr) 1999-10-19 2000-09-07 Polysaccharides a modification cationique

Country Status (9)

Country Link
US (2) US20020139501A1 (fr)
JP (1) JP2003512541A (fr)
KR (1) KR20020060204A (fr)
CN (1) CN1377436A (fr)
AU (1) AU7122100A (fr)
CA (1) CA2386403A1 (fr)
MX (1) MXPA02003881A (fr)
SE (1) SE521309C2 (fr)
WO (1) WO2001029313A1 (fr)

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WO2004025027A1 (fr) * 2002-09-13 2004-03-25 University Of Pittsburgh Composition et procede permettant d'augmenter la resistance d'un produit cellulosique
US7347263B2 (en) 2004-02-27 2008-03-25 University of Pittsburgh - of the Commonwealth of Higher Education Networked polymeric gels and use of such polymeric gels in hydrocarbon recovery
US7494566B2 (en) 2002-09-13 2009-02-24 University Of Pittsburgh - Of The Commonwealth System Of Higher Education Composition for increasing cellulosic product strength and method of increasing cellulosic product strength

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DE60321329D1 (de) * 2002-04-09 2008-07-10 Fpinnovations Geschwollene stärke-latex-zusammensetzungen zur anwendung bei der papierherstellung
FR2854898B1 (fr) * 2003-05-12 2007-07-13 Roquette Freres Procede de cationisation d'amidons issus de legumineuses, amidons cationiques ainsi obtenus et leurs applications
JP2009249785A (ja) * 2008-04-09 2009-10-29 Sansho Kk 澱粉系層間接着剤およびそれを用いた抄紙方法
CN102585097B (zh) * 2012-02-26 2013-06-12 河南工业大学 一种两性淀粉的制备方法
CN112251918B (zh) * 2020-10-12 2022-10-11 惠州市好好爱日化用品有限公司 一种蚕丝面膜基布及其制备方法和蚕丝面膜
US20230002974A1 (en) * 2021-07-02 2023-01-05 Knauf Gips Kg Compositions and methods for making paper using uncooked starch for gypsum panels
CN115322294A (zh) * 2022-10-10 2022-11-11 江苏富淼科技股份有限公司 一种淀粉增效剂及制备方法和应用

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US4643801A (en) * 1986-02-24 1987-02-17 Nalco Chemical Company Papermaking aid
US5349089A (en) * 1989-07-07 1994-09-20 National Starch And Chemical Investment Holding Corporation Reagent for preparing polycationic polysaccharides
WO1991007543A1 (fr) * 1989-11-09 1991-05-30 Eka Nobel Ab Procede de fabrication du papier
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WO1997046591A1 (fr) * 1996-05-30 1997-12-11 George Weston Foods Limited Amidons cationiques reticules et leur utilisation pour la fabrication du papier
US5859128A (en) * 1997-10-30 1999-01-12 E. I. Du Pont De Nemours And Company Modified cationic starch composition for removing particles from aqueous dispersions

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Publication number Priority date Publication date Assignee Title
WO2004025027A1 (fr) * 2002-09-13 2004-03-25 University Of Pittsburgh Composition et procede permettant d'augmenter la resistance d'un produit cellulosique
US7090745B2 (en) 2002-09-13 2006-08-15 University Of Pittsburgh Method for increasing the strength of a cellulosic product
US7494566B2 (en) 2002-09-13 2009-02-24 University Of Pittsburgh - Of The Commonwealth System Of Higher Education Composition for increasing cellulosic product strength and method of increasing cellulosic product strength
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US7347263B2 (en) 2004-02-27 2008-03-25 University of Pittsburgh - of the Commonwealth of Higher Education Networked polymeric gels and use of such polymeric gels in hydrocarbon recovery

Also Published As

Publication number Publication date
MXPA02003881A (es) 2002-10-23
JP2003512541A (ja) 2003-04-02
SE521309C2 (sv) 2003-10-21
US20040031579A1 (en) 2004-02-19
US20020139501A1 (en) 2002-10-03
CN1377436A (zh) 2002-10-30
KR20020060204A (ko) 2002-07-16
AU7122100A (en) 2001-04-30
SE0201183L (sv) 2002-06-19
SE0201183D0 (sv) 2002-04-19
CA2386403A1 (fr) 2001-04-26

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