EP4638865A1 - Composition de résistance et son procédé de dissolution - Google Patents

Composition de résistance et son procédé de dissolution

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Publication number
EP4638865A1
EP4638865A1 EP23833172.2A EP23833172A EP4638865A1 EP 4638865 A1 EP4638865 A1 EP 4638865A1 EP 23833172 A EP23833172 A EP 23833172A EP 4638865 A1 EP4638865 A1 EP 4638865A1
Authority
EP
European Patent Office
Prior art keywords
weight
composition
range
strength
composition according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP23833172.2A
Other languages
German (de)
English (en)
Inventor
Jonas Konn
Markus Korhonen
Asko Karppi
Perttu Heiska
Tomi KEMPAS
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kemira Oyj
Original Assignee
Kemira Oyj
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kemira Oyj filed Critical Kemira Oyj
Publication of EP4638865A1 publication Critical patent/EP4638865A1/fr
Pending legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • 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
    • D21H17/25—Cellulose
    • 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
    • D21H17/25—Cellulose
    • D21H17/26—Ethers 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
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/37—Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/37—Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
    • D21H17/375—Poly(meth)acrylamide
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/71—Mixtures of material ; Pulp or paper comprising several different materials not incorporated by special processes
    • D21H17/72—Mixtures of material ; Pulp or paper comprising several different materials not incorporated by special processes of organic material
    • 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 a strength composition, its use and to a method for dissolving the strength composition according to preambles of the enclosed independent claims.
  • Starch can be supplied in dry form, as particulate powder, which is traditionally dissolved by on-site cooking using elevated temperature and/or pressure.
  • the cooking of starch involves occupational risks, when the operators must be involved with steam, hot liquids and/or pressure.
  • the starch might form gel or gel particles, cause dirtying of the equipment and/or quality defects in the produced fibrous webs.
  • An object of this invention is to minimise or even eliminate the disadvantages existing in the prior art.
  • An object is also to provide a strength composition which is easy to dissolve, and which provides effective increase in strength properties of the formed fibrous web.
  • a further object of this invention is to provide a strength composition has a good storage stability and which is easy to handle in on-site conditions.
  • a typical strength composition according to the present invention for manufacture of paper, board or the like, wherein the composition is in form of a dry particulate mixture, having a dry solids content of at least 80 weight-%, comprises
  • - cationic starch having a degree of substitution, DS, >0.12, preferably >0.14,
  • composition has a net anionic charge density in a range from -0.30 to - 2.0 meq/g, when dissolved in water, at pH 7.
  • Typical use according to the present invention of the strength composition according to the invention is for improving strength properties of a paper, board or the like.
  • a typical method for dissolving a strength composition according to the present invention, having a dry solids content of at least 80 weight-%, comprises
  • a strength composition comprising cationic starch having degree of substitution of >0.12 and an anionic polymeric component can be produced in form of a dry particulate mixture, having dry solids content of at least 80 weight-%, i.e. in powder form.
  • the high cationicity of the cationic starch makes it easy to dissolve, even without high temperature and/or pressure.
  • the strength composition in powder form is homogenous and stable, i.e. there is no significant risk for segregation or separation of the components (particles) during transport and storage.
  • the strength composition according to the present invention is also resistant to caking or agglomerate formation during storage, even in high humidity conditions, which is unexpected.
  • the particles of the anionic polymeric component are surrounded by the particles of cationic starch, possibly due to the high cationicity of the starch, which makes the particulate mixture to resist particle separation and/or caking.
  • the properties of the cationic starch and the anionic polymeric component may thus produce the unexpected advantages of reduced caking, agglomeration and component (particle) separation.
  • the strength composition according to the present invention is in form of a dry particulate mixture.
  • the strength composition is in solid form, e.g. powder, in contrast to liquid form, and comprises discrete particles.
  • the strength composition has a dry solids content of at least 80 weight-%, preferably at least 82 weight-%, more preferably at least 84 weight-%, even more preferably at least 85 weight-%.
  • the dry solids content of the strength composition may be in a range of 80 - 98 weight-%, preferably 82 - 98 weight-%, more preferably at least 84 - 95 weight-%, even more preferably at least 85 - 95 weight-%.
  • the strength composition according to the present invention has a net anionic charge density in a range from -0.30 to -2.0 meq/g, when dissolved in water, at pH 7.
  • the strength composition may have the charge density in the range from -0.4 to -1.6 meq/g, preferably from -0.55 to -1.5 meq/g, when dissolved in water, at pH 7.
  • the charge density is measured by titration with Mutek PCD 03.
  • the net anionic charge density provides the strength composition with optimal interaction with the fibres and thus the final fibre web with the desired strength properties.
  • Cationic starch which is suitable for use as a component in the strength composition, has a degree of substitution, DS, of at least 0.12, preferably at least 0.14, sometimes the degree of substitution may even be at least 0.15 or at least 0.16.
  • DS degree of substitution
  • the cationic starch has a high cationicity which provides several advantages for the strength composition.
  • the high cationicity increases the solubility of the starch, thus effectively minimising the risk of gel formation during the dissolving of the strength composition.
  • High cationicity of the cationic starch may also have a positive effect to the properties of the strength composition itself as well as to the strength properties obtained in the final paper, board or the like.
  • the cationic starch may have the degree of substitution in a range of 0.12 - 0.3, preferably 0.13 - 0.27, more preferably 0.14 - 0.25, for example in a range of 0.15 - 0.22 or 0.16 - 0.22. It is highly unexpected that even if the composition comprises cationic starch with high cationicity, the composition shows good stability, i.e. resistance to caking or agglomerate formation, even in humid and warm conditions.
  • Cationic starch may be obtained by cationising starch by any suitable method.
  • cationic starch is obtained by using 3-chloro-2-hydroxypropyl- trimethylammonium chloride or 2,3-epoxypropyltrimethylammonium chloride for cationisation.
  • cationise starch by using cationic acrylamide derivatives, such as (3-acrylamidopropyl)-trimethylammonium chloride.
  • cationic acrylamide derivatives such as (3-acrylamidopropyl)-trimethylammonium chloride.
  • Various methods for cationisation of starch are known as such for a person skilled in the art.
  • Cationic starch used in the strength composition may originate from potato, waxy potato, rice, waxy corn, sweet potato, arrowroot or tapioca starch, or any combination thereof.
  • cationic starch is potato starch or waxy potato starch, more preferably potato starch.
  • the amylopectin content of the cationic starch is not decisive parameter. It has been observed that the cationic starch may have an amylopectin content ⁇ 80 weight-%, such as less than 75 weight-% or less than 70 weight-%.
  • the amylopectin content of the cationic starch may be in a range from 60 weight-% to less than 80 weight-% or from 65 weight-% to less than 80 weight-%. It is speculated, without wishing to be bound by a theory, that the high cationicity of the cationic starch provides similar advantages in interaction with the anionic polymeric component that were earlier associated with amylopectin content of starch.
  • the cationic starch may have a solubilization temperature of ⁇ 90 °C, preferably ⁇ 80 °C, more preferably ⁇ 70 °C or ⁇ 65 °C, even more preferably ⁇ 60 °C.
  • the solubilisation temperature of cationic starch may be in a range of 20 - 90 °C, preferably 25 - 80 °C, more preferably 30 - 70 °C or 35 - 65 °C, even more preferably 40 - 60 °C.
  • the term “solubilization temperature” denotes the temperature, at which the cationized starch is deemed to fully dissolve in water.
  • the starch is deemed fully dissolved in water, when 25 g of starch is mixed with 1 litre of water, heated to the desired temperature, and mixed for 60 min while maintaining the desired temperature. After this the obtained solution is filtered through 100 micron steel mesh. If more than 0.5 weight-% of material, calculated as dry from the starting starch weight, is retained on the mesh, the starch has not been fully dissolved. If no material is retained on the mesh, the starch has been fully dissolved.
  • the cationic starch may be non-degraded starch.
  • nondegraded starch denotes starch which is essentially untreated by oxidative, thermal, enzymatic and/or acid treatment in a manner that would cause hydrolysis or breakage of glycosidic bonds or degradation of starch molecules or units.
  • the cationic starch may comprise starch units, i.e. starch molecules, of which at least 70 weight-%, preferably at least 80 weight-%, have a weight average molecular weight MW over 20 000 000 g/mol, preferably over 50 000 000 g/mol.
  • the anionic polymeric component of the strength composition may be either a synthetic polymer or an anionically derivatized polysaccharide.
  • the anionic polymeric component is anionically derivatized polysaccharide, as it provides the possibility make the strength composition more sustainable, and to minimise or even completely avoid the use of synthetic petroleum-based polymers.
  • the anionic polymeric component may comprise cationically charged groups , as long as the anionic polymeric component is net anionic.
  • the anionic polymeric component is anionically derivatized polysaccharide, it is preferably carboxymethylated cellulose.
  • the anionic polymeric component may be carboxymethyl cellulose.
  • the anionic polymeric component of the strength composition is an anionically derivatized polysaccharide, such as carboxymethylated cellulose.
  • the strength composition may comprise 40 - 70 weight-%, preferably 45 - 65 weight-%, more preferably 50 - 60 weight-%, of starch, and/or 30 - 60 weight-%, preferably 35 - 55 weight-%, more preferably 40 - 50 weight-%, of the anionically derivatized polysaccharide.
  • the anionic polymeric component may be carboxymethylated cellulose, preferably carboxymethyl cellulose, which may have a degree of carboxymethyl substitution >0.3, preferably >0.4 or >0.45, more preferably >0.5.
  • the degree of carboxymethyl substitution may be in a range of 0.4 - 1 .2, more preferably 0.45 - 1 .0 or 0.5 - 0.9. It has been observed that the degree of carboxymethyl substitution provides enhanced water-solubility for the strength composition in particular form, especially when mixed with the cationic starch having the degree of substitution >0.12.
  • the carboxymethylated cellulose may have a degree of carboxymethyl substitution in the range of 0.5 - 0.9, which provides essentially complete water-solubility for the carboxymethyl cellulose.
  • the carboxymethylated cellulose preferably carboxymethyl cellulose, which is used in the strength composition, may have a charge density value less than -1 .6 meq/g, preferably less than -1.5 meq/g, more preferably less than -2 meq/g, when measured at pH 7.
  • the charge density value may be, for example, in a range from -4.7 to -2.1 meq/g, more preferably from -4.1 to -2.3 meq/g, even more preferably from -3.8 to -2.5 meq/g, when dissolved in water, measured at pH 7. All measured charge density values are calculated per weight as dry.
  • the anionically derivatized polysaccharide comprises carboxymethylated cellulose, preferably carboxymethyl cellulose, which may have viscosity in the range of viscosity in a range of 200 - 20 000 mPas, preferably 400 - 15 000 mPas, more preferably 500 - 10 000 mPas, measured from 2 weight-% aqueous solution at 25 °C, by using Brookfield LV DV1 , as defined in the experimental section.
  • the anionic polymeric component in the strength composition may alternatively be a synthetic polymer, such an anionic copolymer of (meth)acrylamide.
  • the strength composition may comprise 25 - 55 weight-%, preferably 30 - 50 weight-%, more preferably 35 - 45 weight-%, of starch, and/or 45 - 75 weight-%, preferably 50 - 70 weight-%, more preferably 55 - 65 weight-%, of the synthetic polymer.
  • the anionic polymeric component is a synthetic polymer, it is preferably an anionic copolymer of (meth)acrylamide.
  • the anionic polymeric component may be an anionic copolymer of (meth)acrylamide, obtained by polymerisation of (meth)acrylamide and at least one anionic monomer, which is selected from unsaturated mono- or dicarboxylic acids or their salts, such as acrylic acid, methacrylic acid, maleic acid, itaconic acid, crotonic acid, isocrotonic acid, and any of their mixtures.
  • the synthetic polymer component is prepared by radical polymerisation of acrylamide and acrylic acid.
  • the synthetic polymer component may be obtained, for example by gel polymerisation. It is possible that the anionic copolymer of (meth)acrylamide may comprise cationically charged groups as long as the copolymer is net anionic.
  • the synthetic polymer of the strength composition may be an anionic copolymer of (meth)acrylamide, which has an anionicity of 6 - 50 mol-%, preferably 8 - 40 mol-%, more preferably 10 - 30 mol-%.
  • the anionicity relates to the amount of structural units in the synthetic polymer component which originate from anionic monomers.
  • the anionicity of the copolymer is able to advance stronger complex formation with the cationic starch.
  • the synthetic polymer of the strength composition may be an anionic copolymer of (meth)acrylamide, which has a weight average molecular weight MW of >1 500 000 g/mol, preferably >2 000 000 g/mol, more preferably >2 500 000 g/mol.
  • the weight average molecular weight may be, for example, in a range of 2 000 000 - 15 000 000 g/mol, preferably 2 500 000 - 10 000 000 g/mol, more preferably 3 000 000 - 8 000 000 g/mol, even more preferably 2 500 000 - 8 000 000 g/mol.
  • the weight average molecular weights can be determined by measuring the standard viscosity of the polymer and then estimating the weight average molecular weight from a correlation curve based on experimental measurements.
  • the standard viscosity of the polymer gives an indication of the length and/or weight of the polymer chains of the polymer.
  • Standard viscosity (SV) is measured at 0.1 weight-% polymer content in an aqueous 1 M NaCI solution, using Brookfield LV viscometer equipped with UL adapter, at 25 °C, using UL Adapter Spindle and rotational speed 60 rpm.
  • a correlation curve can be made by determining standard viscosity (SV) and intrinsic viscosity (IV) of the polymer.
  • the weight average molecular weights obtained by this method are directive.
  • the strength composition according to the present invention is used for improving strength properties of a paper, board or the like.
  • the strength composition may be dissolved relatively easily even at low temperature.
  • the strength composition and water can be mixed to form a mixture, where the concentration of the strength composition is 0.3 - 8 weight-%, preferably 0.5 - 6 weight-%, more preferably 1 - 5 weight-% or 2 - 5 weight-%, calculated as dry active solids.
  • the strength composition may preferably be mixed with warm water having a temperature in a range of 15 - 80 °C, more preferably 20 - 70 °C, more preferably 25 - 65 °C or 30 - 60 °C.
  • the strength composition may be mixed with cold water, having a temperature of ⁇ 15, and the obtained mixture can be heated to the temperature in a range of 15 - 80 °C, more preferably 20 - 70 °C, more preferably 25 - 65 °C or 30 - 60 °C before the mixture is passed through a first high shear treatment.
  • the strength composition may be mixed with cold water and passed through the first high shear mixer without preceding external heating. Mixing with warm water or heating the mixture is not necessary, but it may speed up and/or promote the dissolution of the strength composition.
  • the obtained mixture of the strength composition and water is passed through the first high shear treatment to a residence reactor.
  • high shear treatment denotes a treatment where the mixture is subjected to a high circumferential speed, high shear rate, high shear forces and high energy dissipation.
  • High shear treatment may involve the use of a high shear dispergator, which are widely used in energy intensive processes such as homogenization, dispersion, emulsification and grinding.
  • the high energy dispergators suitable for use in the high shear treatment may be selected from rotor-stator dispergators, such as a colloid mill, Cavitron or Supraton dispergators; rotor-rotor dispergators, such as Atrex dispergators; friction grinders, such as Masuko supermasscolloiders; homogenizers; fluidizers, such as micro-flu id izer, macrofluidizer or fluidizer-type homogenizer; or any type of milling device such as bead mill.
  • the mechanical energy to the starch is transferred using specific media, such as beads in the bead mill.
  • the high shear treatment comprises a high shear dispergator selected from rotor-stator dispergator or a rotor-rotor dispergator.
  • the high shear dispergator of the high shear treatment may have a power output from 5 to 150 kWh for 1 ton of mixed feed to be treated.
  • the high shear treatment may be continuous or batchwise.
  • the mixture is kept at temperature of ⁇ 80 °C, preferably in a range of 15 - 80 °C, more preferably 20 - 70 °C, more preferably 25 - 65 °C or 30 - 60 °C.
  • the mixture may have a residence time in a range of 1 - 60 min, preferably 1 - 45 min, more preferably 5 - 35 min in the residence reactor.
  • the residence reactor may be any suitable reactor, such as tubular reactor or batch reactor.
  • the mixture is removed from the residence reactor and optionally diluted to a concentration of 1 - 5 weight-%, preferably 2 - 5 weight-%, calculated as dry active solids.
  • the mixture may be removed from the residence reactor through a second high shear treatment. In this manner complete and effective dissolution of the strength composition into the water is ensured and the strength composition is ready for use in paper and board making applications.
  • Dry solids content was determined by using Mettler Toledo HR73, at 150 °C.
  • Viscosity was determined by using Brookfield LV DV1 , equipped with small sample adapter, at 25 °C, using spindle S31. The highest feasible rotation speed for the spindle was used. pH was determined by using a calibrated pH-meter.
  • Charge density was determined at pH 7.0, adjusted with 1 weight-% aqueous NaOH solution, by charge titration using polydiallyldimethylammonium solution as titrant.
  • Mutek PCD-03 was used for end point detection.
  • Strength composition in dry particulate form i.e. powder mixture, comprising cationic starch and carboxymethyl cellulose was made by mixing 56 g cationic starch (DS 0.16, bound nitrogen 1 .2 w-%, dry content 85 %) and 44 g carboxymethyl cellulose, sodium salt (DS 0.80, dry content 89 w-%) for 60 min in a Glas-Col 099A RD20 rotary shaker. Dry content of obtained powder mixture was 87 w-%.
  • Example 1 show that it is possible to dissolve the net anionic strength composition of cationic starch and carboxymethyl cellulose at temperature below 60 °C. Reasonably low dissolution temperature is beneficial in process safety and energy consumption point of view.
  • a separation of particles may occur in dry compositions comprising a mixture of different particles.
  • the size difference, shapes, densities, and friction of the particles will have an impact on the separation tendency of the particles.
  • the separation of particles leads to inhomogeneous composition, where the concentration of different particles varies in different parts of the composition body, e.g. in a storage vessel, such as big bag.
  • the separation may be due to vibrations occurring during transportation conditions.
  • Example 2 the phase separation tendency of the dry particulate strength composition was studied by comparing the particle distributions in the composition before and after a standardized vibration test.
  • the standardized vibration test is intended to simulate the behaviour of the composition during transport in big bags.
  • a strength composition in form of a dry particulate mixture was prepared by mixing a cationic starch (DS >0.14) and an anionic polymer (carboxymethyl cellulose).
  • the obtained strength composition was net anionic, having a charge density in a range from -1 .3 to -0.9 meq/g.
  • the freshly prepared strength composition was analysed as follows: the sample was screened through five (5) screens having decreasing mesh size from 1 mm to 0.09 mm as given in Table 1. Four (4) parallel samples were analysed. The results for the analyses are given in Table 1 .
  • the separation tendency of the particles in the dry strength composition was studied by using a vibrating screen device (Fritsch analysette, type 03.502).
  • the induced vibrations simulate the conditions during a transport of the dry strength composition.
  • 800 g of the strength composition was packed in a tightly sealed plastic bag to simulate a typical powder big bag.
  • the strength composition in the tightly sealed plastic bag was placed on top of the vibrating screen device with the topside of the plastic bag facing upwards.
  • the vibrating screen device was set on continuous vibration with amplitude of 5 (of maximum 10) for 1 hour. Thereafter, the tightly sealed plastic bag was carefully removed from the vibrating screen device. Two samples, one from the top of the plastic bag and one from the bottom of the plastic bag were carefully taken and analysed with the same screen setup used above. The results are given in Table 2.

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

Abstract

La présente invention concerne une composition de résistance pour la fabrication de papier, de carton ou d'autres produits analogues. La composition se présente sous la forme d'un mélange de particules sèches et sa teneur en matière sèche est d'au moins 80 % en poids. La composition comprend de l'amidon cationique, dont le degré de substitution, DS, est > 0,12, de préférence > 0,14, et un composant polymère anionique, la densité de charge anionique nette de la composition étant comprise entre -0,30 et -2,0 méq/g, lorsqu'elle est dissoute dans l'eau, à un pH de 7. L'invention concerne également un procédé de dissolution de la composition de résistance.
EP23833172.2A 2022-12-21 2023-12-20 Composition de résistance et son procédé de dissolution Pending EP4638865A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20226142 2022-12-21
PCT/FI2023/050716 WO2024134028A1 (fr) 2022-12-21 2023-12-20 Composition de résistance et son procédé de dissolution

Publications (1)

Publication Number Publication Date
EP4638865A1 true EP4638865A1 (fr) 2025-10-29

Family

ID=89428663

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23833172.2A Pending EP4638865A1 (fr) 2022-12-21 2023-12-20 Composition de résistance et son procédé de dissolution

Country Status (4)

Country Link
EP (1) EP4638865A1 (fr)
KR (1) KR20250123201A (fr)
CN (1) CN120418504A (fr)
WO (1) WO2024134028A1 (fr)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8980056B2 (en) * 2010-11-15 2015-03-17 Kemira Oyj Composition and process for increasing the dry strength of a paper product
FI20185272A1 (en) * 2018-03-22 2019-09-23 Kemira Oyj Dry strength composition, its use and method for making of paper, board or the like

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Publication number Publication date
CN120418504A (zh) 2025-08-01
KR20250123201A (ko) 2025-08-14
WO2024134028A1 (fr) 2024-06-27

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