EP1402114A1 - Composition pigmentaire - Google Patents

Composition pigmentaire

Info

Publication number
EP1402114A1
EP1402114A1 EP02746245A EP02746245A EP1402114A1 EP 1402114 A1 EP1402114 A1 EP 1402114A1 EP 02746245 A EP02746245 A EP 02746245A EP 02746245 A EP02746245 A EP 02746245A EP 1402114 A1 EP1402114 A1 EP 1402114A1
Authority
EP
European Patent Office
Prior art keywords
dispersion
slurry
group
pigment particles
paper
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02746245A
Other languages
German (de)
English (en)
Inventor
Rein Sikkar
Olof Eriksson
Michael Persson
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.)
Akzo Nobel NV
Nouryon Pulp and Performance Chemicals AB
Original Assignee
Akzo Nobel NV
Eka Chemicals AB
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 Akzo Nobel NV, Eka Chemicals AB filed Critical Akzo Nobel NV
Priority to EP02746245A priority Critical patent/EP1402114A1/fr
Publication of EP1402114A1 publication Critical patent/EP1402114A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/36—Compounds of titanium
    • C09C1/3607—Titanium dioxide
    • C09C1/3676—Treatment with macro-molecular organic compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/02—Compounds of alkaline earth metals or magnesium
    • C09C1/021—Calcium carbonates
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/40—Compounds of aluminium
    • C09C1/42—Clays
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
    • C09C3/10—Treatment with macromolecular organic compounds
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/42—Coatings with pigments characterised by the pigments at least partly organic
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/51—Particles with a specific particle size distribution
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/51—Particles with a specific particle size distribution
    • C01P2004/52—Particles with a specific particle size distribution highly monodisperse size distribution
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/60—Particles characterised by their size
    • C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/60—Particles characterised by their size
    • C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/22—Rheological behaviour as dispersion, e.g. viscosity, sedimentation stability
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/60—Optical properties, e.g. expressed in CIELAB-values
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/80—Compositional purity
    • C01P2006/82—Compositional purity water content

Definitions

  • the present invention relates to a slurry or dispersion of pigment particles comprising as dispersant an amphiphilic polymer and the preparation thereof.
  • the invention further relates to a coating colour composition, a process for its preparation, a process for preparing coated paper or board, and paper or board obtainable by the process.
  • Paper is frequently coated in order to impart certain desired properties to the paper. For example, a surface suitable for printing or having improved gloss characteristics is often desirable. It is often desired that the paper surface should exhibit a certain degree of gloss in order to be aesthetically pleasing, and also from a printing point of view. Gloss can be imparted mechanically by calendering of the paper. However, during calendering the bulk of the paper will be reduced, which leads to a less rigid paper structure that is more pliant and flexible. This secondary effect of extensive calendering in order to obtain gloss is however not always desired.
  • Conventional coating colour compositions for paper usually comprise a slurry or dispersion of pigment particles together with various additives.
  • the coating colour composition is usually prepared by first providing a dispersion or slurry of pigment particles together with one or more dispersants, and then mixing this dispersion or slurry with additives such as a binder (e.g. latex or starch) and rheological agents such as co- binders or thickening agents (e.g. CMC).
  • additives such as a binder (e.g. latex or starch) and rheological agents such as co- binders or thickening agents (e.g. CMC).
  • additives such as a binder (e.g. latex or starch) and rheological agents such as co- binders or thickening agents (e.g. CMC).
  • additives such as a binder (e.g. latex or starch) and rheological agents such as co- binders or thickening agents (e.
  • the pigment particles are generally small, weakly charged particles, e.g. with an average diameter from about 0.2 to about 1 ⁇ m. When suspended in water, the particles will have a tendency to aggregate due to the attractive forces if these are stronger than the repulsion forces. Thus, when the solid substance level increases in the pigment slurry, agglomeration or other problems of dispersing the pigments are likely to occur. The addition of one or more dispersants is therefore necessary. Commonly used dispersants are predominantly anionic, charged polymers, such as polyacrylic acids (PAA) and polyphosphates.
  • PAA polyacrylic acids
  • dispersant will lower the viscosity to a certain point, after which any further addition of dispersant, due to the inherent viscosity of the dispersant, will lead to a significantly increased viscosity.
  • concentration of the dispersant corresponding to the minimum viscosity of the pigment slurry for a given solid substance level thereof. For a given dispersant, this concentration will be mostly dependent on the type of pigment used.
  • any coated broke obtained will consequently contain high levels of heavily charged species, which, when re-introduced at the wet end of the paper machine, will interfere with the function of flocculants, and other agents used therein.
  • a highly charged dispersant e.g. PAA
  • the temperature at which the significant viscosity increase starts can be raised by the addition of surfactants so the non-charged polymer molecules will behave as charged molecules by virtue of the surfactants ions attracted thereto and no significant viscosity increase will occur below, for example, 100°C.
  • One aspect of the present invention concerns an aqueous slurry or dispersion of pigment particles comprising as dispersant an amphiphilic polymer at least partly adsorbed to the pigment particles, wherein the slurry or dispersion exhibits a temperature dependent viscosity in such way that the viscosity increases at least with a factor of about 2, preferably at least with a factor of about 5, most preferably at least with a factor of about 10 when the temperature is raised from about 20 up to about 100°C, preferably from about 30 up to about 80°C, most preferably from about 40 up to about 70°C.
  • a factor of about 2 preferably at least with a factor of about 5
  • the temperature is raised from about 20 up to about 100°C, preferably from about 30 up to about 80°C, most preferably from about 40 up to about 70°C.
  • the solids content of slurry or dispersion is suitably above about 60 wt%, preferably above about 70 wt%.
  • the upper limit is only set by the viscosity, which below about 20°C, preferably below about 30°C should be sufficiently low for the slurry or dispersion to be possible to pump.
  • Below about 20°C the Brookfield viscosity is preferably from about 50 to about 1000 mPas, most preferably from about 50 to about 200 mPas. In practice, it may then be difficult to provide useful slurries or dispersions with a solids content exceeding about 80 wt%.
  • the pigment particles are suitably weakly charged and preferably inorganic, such as clay (e.g. kaolin), TiO 2) calcium carbonate, or mixtures thereof.
  • clay e.g. kaolin
  • TiO 2 calcium carbonate
  • the average particle diameter of the pigment particles is suitably from about 0.1 to about 2 ⁇ m, preferably from about 0.2 to about 1 ⁇ m.
  • dispersant refers to chemicals participating in the deflocculation process of the pigment particles.
  • the dispersant reduce the energy necessary to separate the pigment into discrete particles, provide stability that prevents agglomeration upon storage and decrease the viscosity at high solids content.
  • the dispersants preferably have only little effect on surface tension, only little wetting action, low foaming, but high deflocculation power.
  • the dispersants of this invention are at least partially adsorbed to the pigment particles.
  • the amphiphilic polymer used as dispersant preferably has an average molecular weight from about 2000 to about 200000, more preferably from about 3000 to about 100000, and most preferably from about 5000 to about 20000.
  • the dispersants to be used in the invention have different structure from PAA, and are, as opposed to the hydrophilic PAA, amphiphilic polymers, i.e., contain both hydrophilic and hydrophobic groups.
  • the hydrophilic groups are preferably selected from charged anionic moiety, PEO/PPO (polyethylene oxide/polypropene oxide), or mixtures there of.
  • PEO/PPO polyethylene oxide/polypropene oxide
  • at least some of the hydrophilic groups are charged, which groups most preferably are selected from inorganic or organic acidic residues such as sulphonates, phosphonates, carboxylates, or mixtures thereof.
  • Preferred polymers are copolymers, comprising hydrophilic and hydrophobic residues, which residues preferably are alternating along a backbone, while hydrophilic, preferably charged, anchoring groups are positioned along the backbone.
  • the hydrophobic residues are preferably C 4 to C 2 o, most preferably C 4 - C 18 carbon chains.
  • the hydrophilic residues suitably comprise PEO/PPO chains or segments along the polymer backbone.
  • the hydrophilic residues preferably comprise from about 5 to about 50 EO/PO units, most preferably from about 20 to about 50 EO/PO units.
  • amphiphilic polymers of the invention that per se do not exhibit a significant viscosity increase between about 20 to about 100°C, do so when partially adsorbed to the pigment particles. If the polymer is charged, it is believed that some of the charges are neutralised by adsorbing to the surface of the pigment particles, while the polymer will retain its dispersing action by virtue of residual charges. Thus, adsorption to the surface through partial electrical neutralisation, and remaining electrical charges on the pendant chains is a feature of the preferred polymers of the invention.
  • amphiphilic polymers that per se exhibit a significant viscosity increase between about 20 to about 100°C can be used in the invention provided they are effective as dispersants and exhibit such temperature dependent viscosity properties also when at least partially adsorbed to the pigment particles.
  • the hydrophilic and hydrophobic tails of the polymers are reaching out from the surface of the pigment particle, thereby creating electrosteric or steric stabilisation.
  • the polymers of the present invention are believed to be less sensitive to the presence of salt than polymers only relying on an action of stabilisation via electrical charges.
  • the dispersing agent is an acrylic ester copolymer having pendant hydrophobic chains, hydrophilic chains, and exhibiting phosphonic acid or carboxylic acid as anions.
  • the pendant hydrophobic chains are preferably C 4 - C 2 o, and most preferably C - C 18 carbon chains.
  • Said hydrophilic chains preferably comprise alkylene oxide groups, preferably EO (ethylene oxide) and/or PO (propylene oxide) groups, more preferably 2 to 50, and most preferably 10 - 30 EO and/or PO groups. It is preferred that the alkylene oxide groups are only EO groups, or essentially only EO groups. Phosphonate groups in the polymer will give rise to a strong adsorption to calcium carbonate particles.
  • the dispersant is selected from hydrophobically modified carboxymethyl cellulose (HM-CMC).
  • HM-CMC hydrophobically modified carboxymethyl cellulose
  • Particularly preferred HM- CMC polymers are those obtainable by a process comprising reacting an alkali metal cellulose with at least three alkylating reagents A, B, and C;
  • one or more reagents A being selected from the group of haloacetic acids, alkali metal haloacetates, alkali metal vinyl sulfonates, and vinyl sulfonic acid;
  • R 1 represents a C 2 -C 7 group
  • R 2 is hydrogen or a methyl group
  • n is 0-2
  • P represents a glycidyl ether group, a 3-halo-2-hydroxypropyl ether group, a 1,2-epoxy group, or a halide
  • HM-CMC polymers having the formula R 3 -(OCH 2 CH(R 2 )) m -P wherein R 3 represents a C 8 -C 30 group, m is 0-10, and R 2 and P have the meaning as described above.
  • HM-CMC polymers are described in more detail in WO 98/56825.
  • copolymers based on polyurethane chemistry can be used as dispersants, such as those described in US 4096127 or US 4777224, i.e. polyurethane copolymers exhibiting at least one carboxylic acid residue as an anionic moiety.
  • copolymers based on alfa-olefin/maleic acid anhydride chemistry can be used as dispersants, such as those described in US 4931197, and especially in Example 1 therein, i.e. alpha olefin/maleic acid copolymer exhibiting at least one carboxylic acid residue as an anionic moiety.
  • the polymers used as dispersant can also be based on any chemistry being able to create copolymers exhibiting similar hydrophobic and hydrophilic parts wherein the anionic anchoring group may comprise any suitable acidic functionality, e.g. natural polymers like carbohydrates modified by introducing charged groups along the backbone or grafted with hydrophobic and hydrophilic tails, as exemplified by the earlier mentioned hydrophobically modified carboxymethyl cellulose.
  • the anionic anchoring group may comprise any suitable acidic functionality, e.g. natural polymers like carbohydrates modified by introducing charged groups along the backbone or grafted with hydrophobic and hydrophilic tails, as exemplified by the earlier mentioned hydrophobically modified carboxymethyl cellulose.
  • the slurry or dispersion may comprise one or more amphiphilic polymer as described above, optionally in combination with one or more other dispersing agents.
  • the slurry or dispersion suitably has a solids content from about 40 to about 80 wt%, preferably from about 60 to about 75 wt%, of which the main part, preferably substantially all, is made up of pigment particles. It suitably comprises, as dispersant, from about 0.1 to about 4 wt% based on dry pigment, preferably from about 0.1 to about 2 wt% based on dry pigment of one or more amphiphilic polymer as described above.
  • the water content is suitably from about 20 to about 60 wt% based on dry pigment, preferably from about 25 to about 40 wt% based on dry pigment.
  • the content of other component is preferably less than about 0.5 wt% based on dry pigment, most preferably less than about 0.1 wt%.
  • the invention further concerns a process for the preparation of a slurry or dispersion as described above comprising a step of mixing pigment particles, water and an amphiphilic polymer that becomes at least partly adsorbed to the pigment particles to obtain a slurry or dispersion exhibiting a temperature dependent viscosity as earlier described.
  • the invention also concerns a coating colour composition
  • a coating colour composition comprising a slurry or dispersion as described above and at least one additive selected from the group consisting of binders, co-binders, rheology modifiers, foam depressants, optical brightening agents, pH adjusting agents, lubricants, preservatives and insolubilisers, wherein the coating colour composition exhibits a temperature dependent viscosity as defined in the above description of the slurry or dispersion.
  • the viscosity increases at least with a factor of about 2, preferably at least with a factor of about 5, most preferably at least with a factor of about 10 when the temperature is raised from about 20 up to about 100°C, preferably from about 30 up to about 80°C, most preferably from about 40 up to about 70°C.
  • the properties of exhibiting a significant viscosity increase between about 20 and about 100°C depends on the presence of the amphiphilic polymer as dispersant that is at least partially adsorbed to the pigment particles.
  • the solids content of the coating colour composition is suitably above about 50 wt%, preferably above about 60 wt%.
  • the upper limit is only set by the viscosity, which below about 20°C, preferably below about 30°C should be sufficiently low for the composition to be applied to the surface of paper or paperboard.
  • Below about 20°C the Brookfield viscosity is preferably from about 50 to about 5000, most preferably from about . 50 to about 3000 mPas. In practice, it may then be difficult to provide useful slurries or dispersions with a solids content exceeding about 80 wt%.
  • the amphiphilic polymer used as dispersant is preferably present in the coating colour composition in an amount, based on 100 pph (part per hundred) pigment particles, from about 0.05 to about 10 pph, preferably from about 0.1 to about 5 pph, most preferably from about 0.1 to about 2 pph. If the solids content is low, for example below about 60 wt%, also the amount of dispersant can in some cases be lower than the above figures, while higher amounts sometimes may be required for compositions of high solids content. A suitable amount of dispersant to be included can in each case be established by person skilled in the art merely by routine experimentation.
  • compositions preferably comprise from about 5 to about 25 pph of one or more binders.
  • Any conventional binder can be used, such as starch, latex, protein, polyvinyl alcohol, and mixtures thereof.
  • compositions preferably comprise from about 0.1 to about 5 pph of one or more co-binders or rheology modifiers.
  • Any conventional co-binder can be used, such as carboxy methyl cellulose (CMC), other cellulose derivatives, polyvinyl alcohol, sodium alginate, alkali-swelling polyacrylates, and mixtures thereof.
  • compositions preferably comprise from about 0.1 to about 5 pph of other additives.
  • Any conventional additive can be used, such as foam depressants, dispersants (in addition to the amphiphilic polymer at least partly adsorbed to the pigment particles), optical brightening agents (OBA), lubricants, pH adjusting agents, insolubilisers, etc. All these additives are conventional and can easily be selected by those skilled in the art.
  • a particularly preferred composition of the invention comprise, based on 100 parts of pigment and calculated on a dry solids content on a weight basis: pigments, 100 pph; amphiphilic polymer as dispersant, from about 0.1 to about 4 wt pph, most preferably from about 0.1 to about 2 pph; binders, from about 5 to about 25 pph, most preferably from about 10 to about 15 pph; co-binders or rheology modifiers, from about 0.1 to about 4 pph, most preferably from about 0.5 to about 2 pph; other additives, from about 0.1 to about 5 pph, most preferably from about 0.1 to about 2 pph.
  • the invention further concerns a process for the preparation of a coating colour composition of the invention comprising the step of mixing a slurry or dispersion of pigment particles as earlier described with at least one additive selected from the group consisting of binders, co-binders, rheology modifiers, foam depressants, optical brightening agents, pH adjusting agents, lubricants, preservatives and insolubilisers.
  • the invention further concerns a process for the preparation coated paper or paperboard comprising the steps of applying a coating colour composition as described above to a paper or paperboard web followed by bringing said coating colour composition to a temperature sufficient for increasing the viscosity at least with a factor of about 2, preferably at least with a factor of about 5, most preferably at least with a factor of about 10, which temperature suitably is above about 20°C, preferably above about 30°C, most preferably above about 40°C.
  • a coating colour composition as described above to a paper or paperboard web followed by bringing said coating colour composition to a temperature sufficient for increasing the viscosity at least with a factor of about 2, preferably at least with a factor of about 5, most preferably at least with a factor of about 10, which temperature suitably is above about 20°C, preferably above about 30°C, most preferably above about 40°C.
  • the amount applied is not critical and can be any conventionally used amount, such as for example from about 1 to about 50 g/m2, preferably from about 3 to about 25 g/m2, calculated as dry solids per side of the paper or paperboard.
  • Coating can be performed either on machine or off machine.
  • different types of coating methods can be used, some of which are more suitable in the case of off-machine coating, and others in the case of on-machine coating.
  • blade coating is conveniently used in both cases, whereas air knife coating, roll coating, size press coating and cast coating are normally only used in on machine coating.
  • the predominantly used method is blade coating.
  • the colour is normally initially applied to the paper surface in a considerable excessive amount, for example by passing the paper web on a roll into a tray containing the coating colour, such as by means of a roll applicator.
  • a jet applicator can be used.
  • the paper After coating, the paper is dried, which in the case of on machine coating normally is accomplished in the drying section of the machine.
  • Conventionally used means of drying in the drying section such as infra red radiation, hot air, heated cylinders or any combination thereof, may be used.
  • the means of drying is not critical to the invention.
  • the temperature for the viscosity to increase significantly, resulting in immobilisation of the coating colour, is preferably reached when the paper is subjected to heat for drying thereof, for example by means of infrared radiation.
  • the gloss can be markedly improved.
  • Other qualities are also unexpectedly improved. For example, a more even distribution of the binder of the colour throughout the surface of the coated paper is obtained, leading to a reduced mottling phenomenon. The colour density obtained when the paper is printed is also increased. An improved cohesion within the applied and dried coating has also been observed. Thus, reduced cracking of the coating has been observed when the paper of the invention is folded or creased.
  • the coating can be brought to immobilise essentially instantaneously on a paper surface when heated. Accordingly, the coating systems of the invention can be designed to immobilise at a desired temperature and thereby customised to each individual paper machine.
  • the phenomenon of mottling which is partly due to migration of binder and pigments from the coating into the base paper after coating, and any additional migration also in opposite direction during drying of the coated paper, can be substantially reduced by use of the coating colour of the present invention.
  • the invention also concerns paper or paperboard obtainable by the method described above.
  • DispexTM comprising a conventional anionic, sodium polyacrylate
  • DispexTM is used as the reference dispersant herein.
  • higher amounts are required of the dispersants of the invention in order to reach the same low viscosity.
  • Calculated on a charge basis the dispersants of the invention are more effective.
  • coating was performed both in a pilot-scale coating machine as well as in a laboratory coater. If not otherwise stated all percentages and parts refer to percent and parts by weight.
  • Example 1 A coating colour of a total solids content of 60 wt% was prepared by uniformly blending 3.38 g (0.9 %) of a 40% aqueous solution of a sodium polyacrylate dispersing agent (DispexTM N40 manufactured by Ciba Specialty Chemicals), 86.32 g of deionized water, 0.1 g of antifoam (CoatosilTM 1378 manufactured by Witco), 150 g of scalenohedral precipitated calcium carbonate manufactured by Huber Engineered Materials, 33.33 g (11 %) of a 50% dispersion of SB latex (Baystal P7105 manufactured by Eka Polymer Latex) and 8.40 g (0.6 %) of a 10% aqueous solution of CMC (FinnfixTM 10 manufactured by Noviant).
  • a sodium polyacrylate dispersing agent Dispersing agent
  • Disionized water 86.32 g
  • antifoam CoatosilTM 1378 manufactured by Witco
  • Example 2 A coating colour of a total solids content of 60 wt% was prepared by uniformly blending 1.08 g (0.15 %) of a 10% aqueous solution of a sodium polyacrylate dispersing agent (DispexTM N40 manufactured by Ciba Specialty Chemicals), 48.98 g of deionized water, 0.1 g of antifoam (CoatosilTM 1378 manufactured by Witco), 72 g of rhombohedral precipitated calcium carbonate manufactured by Huber Engineered Materials, 16.06 g (11 %) of a 50% dispersion of SB latex (BaystalTM P7105 manufactured by Eka Polymer Latex) and 4.02 g (0.6 %) of a 10% aqueous solution of CMC (FinnfixTM 10 manufactured by Noviant).
  • a sodium polyacrylate dispersing agent Dispersing agent
  • Dispersing agent Dispersing agent
  • deionized water 48.98 g of deionized water
  • Example 3 A coating colour of a total solids content of 60 wt% was prepared by uniformly blending 30.0 g (2 %) of a 10% aqueous solution of a styrene acrylic butyl ester comb copolymer containing both PEO/PPO combs and phosphonic acid as anchoring group with a molecular weight distribution between 5000 and 30000 g/mol as dispersing agent, 62.68 g of deionized water, 0.1 g of antifoam (CoatosilTM 1378 manufactured by
  • Example 4 A coating colour of a total solids content of 60 wt% was prepared by uniformly blending 9.90 g (1.1 %) of a 17% aqueous solution of a polyurethane based copolymer containing both PEO segments, C-
  • Example 5 A coating colour of a total solids content of 60 wt% was prepared by uniformly blending 2.74 g (0.75 %) of a 20% colloidal dispersion of a polyurethane copolymer (JetsizeTM AP15 manufactured by Eka Chemicals), 48.03 g of deionized water, 0.1 g of antifoam (CoatosilTM 1378 manufactured by Witco), 72 g of rhombohedral precipitated calcium carbonate manufactured by Huber Engineered Materials, 16.06 g (11 %) of a 50% dispersion of SB latex (BaystalTM P7105 manufactured by Eka Polymer Latex) and 4.04 g (0.6 %) of a 10% aqueous solution of CMC (FinnfixTM 10 manufactured by Noviant).
  • a polyurethane copolymer JetsizeTM AP15 manufactured by Eka Chemicals
  • deionized water 48.03 g
  • antifoam CoatosilTM 1378 manufactured
  • Example 6 A coating colour of a total solids content of 60 wt% was prepared by uniformly blending 0.96 g (0.15 %) of a 10% aqueous solution of a sodium polyacrylate dispersing agent (DispexTM N40 manufactured by Ciba Specialty Chemicals), 2.43 g (0.75 %) of a 20% colloidal dispersion of a polyurethane copolymer (JetsizeTM AP15 manufactured by Eka Chemicals), 50.78 g of deionized water, 0.1 g of antifoam (CoatosilTM 1378 manufactured by Witco), 64 g of rhombohedral precipitated calcium carbonate manufactured by Huber Engineered Materials, 14.28 g (11 %) of a 50% dispersion of SB latex (BaystalTM P7105 manufactured by Eka Polymer Latex) and 3.60 g (0.6 %) of a 10% aqueous solution of CMC (FinnfixTM 10 manufactured by Noviant).
  • Example 7 A coating colour of a total solids content of 60 wt% was prepared by uniformly blending 0.56 g (0.3 %) of a 40% aqueous solution of a sodium polyacrylate dispersing agent (DispexTM N40 manufactured by Ciba Specialty Chemicals), 43.46 g of deionized water, 0.1 g of antifoam (CoatosilTM 1378 manufactured by Witco), 75 g of kaolin clay (SpeswhiteTM manufactured by Imerys), 16.67 g (11 %) of a 50% dispersion of SB latex (BaystalTM P7105 manufactured by Eka Polymer Latex) and 4.18 g (0.6 %) of a 10% aqueous solution of CMC (FinnfixTM 10 manufactured by Noviant).
  • a sodium polyacrylate dispersing agent Dispersing agent
  • Disionized water 43.46 g
  • antifoam CoatosilTM 1378 manufactured by Witco
  • 75 g of kaolin clay
  • Example 8 In this example, the temperature dependent behaviour of the PCC colour from Example 3 and a conventional PCC colour (Comp. Example 1), were examined using a rheometer model UDS200 from PAAR Physica. The temperature tests were performed between 25 and 85°C within the linear viscoelastic region.
  • Example 9 In this example, a PCC colour containing a polymer of the invention from Example 3 and a conventional PCC colour (Comp. Example 1) were each applied to a sheet of paper according to the conditions shown in table 2 and the physical properties of the coated paper sheets were measured after drying. Table 2. Application conditions.
  • the surface roughness (PPS-10) was measured according to SCAN-P 21.
  • the gloss was measured using a micro-gloss 75° meter from BYK-Gardner.
  • the colour density is a mean value of yellow, cyan, magenta and black measured on ink-jet print using a GRETAG D19C densitometer from GretagMacbeth.
  • the contact angle was measured after 10 seconds using a DAT 1100 from Fibro.
  • the variation of latex on the surface has been analysed using a Chromatoscanner from Shimadzu, Japan. High value represents unevenly latex distribution. Mottling, uneven ink absorption at offset print, was also measured. A high value represents uneven ink absorption. The results of testing are shown in table 3.
  • Example 10 In this example, the temperature dependent behaviour of PCC colour of Example 4 and a conventional PCC colour (Comp. Example 1) were examined using a rheometer model UDS200 from PAAR Physica. The temperature tests were performed between 25 and 85°C within the linear viscoelastic region.
  • Example 11 In this example, the PCC colour of Example 5, the PCC colour of Comp. Example 6, containing a combination of the polymer of the invention and a conventional dispersing agent, and a conventional PCC colour from Comp. Example 2, were compared. The colours were each applied to a sheet of paper using a draw-down coating applicator and the gloss value of the coated paper sheets were measured after drying and soft calendering. The results of the testing are shown in table 5.
  • the gloss was measured using a micro-gloss 75° meter from BYK-Gardner.
  • the contact angle was measured after 10 seconds using a DAT 1100 from Fibro.
  • the colour density is a mean value of yellow, cyan, magenta and black measured on ink-jet print using a GRETAG D19C densitometer from GretagMacbeth.
  • Example 12 In this example, a PCC colour of the invention (Example 3) and a conventional PCC colour (Comp. Example 1) were each applied to a plastic film. The coating layer could be separated from the film, the mechanical properties was measured using an Alwetron TH1 from Lorentzon & Wettre. The elongation and the tensile energy absorption were measured. Table 6. The elongation of coated layer.
  • Example 13 In this example, the PCC colour of Example 3 of the invention and the conventional PCC colour of Comp. Example 1 , were each applied to a sheet of paper as in Example 9. After drying and calendering, the coated paper sheets were folded and the foldings examined. The coating of the invention exhibited a markedly reduced number of cracks, as compared to the conventional coating.
  • Example 14 In this example, paper was coated using a draw-down coating applicator, and the gloss obtained with the coating colour of Example 3 of the invention was compared to that of a conventional kaolin clay colour (Comp. Example 7), using Dispex as the dispersant, in which colour the PCC had been replaced with clay in order to improve the gloss. After light calendering, the coated paper using the PCC containing colour exhibited higher gloss compared to the coated paper using the clay containing colour.
  • a conventional kaolin clay colour Comp. Example 7
  • Example 15 A coating colour of a total solids content of 60 wt% was prepared by uniformly blending 0.42 g (0.30 %) of a hydrophobically modified carboxymethyl cellulose (HM-CMC) as described in WO 98/56825, having a degree of substitution of carboxy methyl groups around 0.95, a degree of substitution of C4 alkyl groups around 0.1 a degree of substitution of C14 alkyl groups around 0.006, a molecular weight distribution between 20000 and 70000 g/mol, and a solids content of 86.3 %, 46.96 g of deionized water, 150 g of rhombohedral precipitated calcium carbonate with a solids content of 80.5 % manufactured by Huber Engineered Materials, 26.83 g (11%) of a 50 % dispersion of SB latex (BaystalTM P7105 manufactured by Eka Polymer Latex) and 1.13 g (0.75 %) of CMC with a solids content of 89.4
  • the PCC colour with HM-CMC and a conventional PCC colour from Comp. Example 2 were also compared.
  • the colours were each applied to a sheet of paper using a draw-down coating applicator and the gloss value of the coated paper sheets were measured after drying and soft calendering

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Paper (AREA)
  • Paints Or Removers (AREA)
  • Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
  • Pigments, Carbon Blacks, Or Wood Stains (AREA)

Abstract

Cette invention porte sur une suspension ou une dispersion aqueuse de particules de pigment comprenant comme agent dispersant un polymère amphiphile au moins partiellement adsorbé aux particules de pigment. Cette suspension ou dispersion aqueuse présente une viscosité dépendant de la température, la viscosité augmentant d'un facteur au moins égal à environ 2 lorsque la température augmente d'environ 20 à environ 100 °C. Cette invention concerne également une préparation de suspension ou de dispersion, une composition de sauce de couchage, un procédé de préparation de cette composition, un procédé de préparation de papier ou de carton couché, ainsi qu'un papier ou un carton pouvant être obtenu par ce procédé.
EP02746245A 2001-07-02 2002-06-20 Composition pigmentaire Withdrawn EP1402114A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP02746245A EP1402114A1 (fr) 2001-07-02 2002-06-20 Composition pigmentaire

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US30183601P 2001-07-02 2001-07-02
EP01202535 2001-07-02
EP01202535 2001-07-02
US301836P 2001-07-02
EP02746245A EP1402114A1 (fr) 2001-07-02 2002-06-20 Composition pigmentaire
PCT/SE2002/001239 WO2003004767A1 (fr) 2001-07-02 2002-06-20 Composition pigmentaire

Publications (1)

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EP1402114A1 true EP1402114A1 (fr) 2004-03-31

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EP (1) EP1402114A1 (fr)
JP (1) JP3979534B2 (fr)
CN (1) CN1232696C (fr)
CA (1) CA2450706C (fr)
WO (1) WO2003004767A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI123391B (fi) 2005-12-01 2013-03-28 Aalto Korkeakoulusaeaetioe Menetelmä paperin tai kartongin painopinnan modifioimiseksi
EP1975206A1 (fr) * 2007-03-30 2008-10-01 M-real Oyj Dispersions aqueuses et procédé de fabrication correspondant
GB0712482D0 (en) 2007-06-27 2007-08-08 Eastman Kodak Co Thermally-responsive dispersants for media formulations
US8142887B2 (en) * 2008-03-21 2012-03-27 Meadwestvaco Corporation Basecoat and associated paperboard structure
SE536746C2 (sv) * 2010-05-12 2014-07-08 Stora Enso Oyj En komposition innehållande mikrofibrillerad cellulosa och en process för tillverkning av en komposition
FR2988396A1 (fr) * 2012-03-23 2013-09-27 Coatex Sas Utilisation de polymeres faiblement ioniques comme agents compatibilisants dans des suspensions aqueuses de charges minerales anioniques contenant un sel mineral ou organique
US10125219B2 (en) * 2014-10-30 2018-11-13 Tronox Llc Titanium dioxide pigment and manufacturing method
US9745405B2 (en) 2015-04-20 2017-08-29 Tronox Llc Polymer, polymer modified titanium dioxide pigment, and method of forming a pigmented paint formulation
US20220158190A1 (en) * 2019-03-18 2022-05-19 Daicel Corporation Slurry
CN110284348A (zh) * 2019-06-27 2019-09-27 绍兴晨唯新材料科技股份有限公司 一种可随温度变化颜色的面料的生产工艺

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3440199A (en) * 1965-03-31 1969-04-22 Air Reduction Aqueous paint composition containing an interpolymer of vinyl acetate,ethylene and glycidyl acrylate
US4155892A (en) * 1975-10-03 1979-05-22 Rohm And Haas Company Polyurethane thickeners for aqueous compositions
NO149177C (no) * 1977-01-28 1984-02-29 Basf Ag Papirbestrykningsmasser
JPS6268857A (ja) * 1985-09-19 1987-03-28 Nippon Shokubai Kagaku Kogyo Co Ltd 無機顔料分散剤
JPS6335899A (ja) * 1986-07-30 1988-02-16 新王子製紙株式会社 分散剤
US4826970A (en) * 1987-09-17 1989-05-02 Hercules Incorporated Carboxymethyl hydrophobically modified hydroxyethylcellulose
ATE85066T1 (de) * 1988-01-25 1993-02-15 Engelhard Corp Kaolinbrei, seine herstellung und dafuer geeignetes dispergierungsmittel.
US4994112A (en) * 1989-10-30 1991-02-19 Aqualon Company Hydrophobically modified cellulosic thickeners for paper coating
US5494509A (en) * 1993-10-29 1996-02-27 Aqualon Company Paper coating composition with increased thickener efficiency
FR2732620B1 (fr) * 1995-04-10 1997-05-09 Coatex Sa Copolymeres utilises comme dispersant ameliorant la resistance a l'eau des films de compositions aqueuses chargees et/ou pigmentees ainsi que les compositions les contenant
JPH0949193A (ja) * 1995-08-09 1997-02-18 Toagosei Co Ltd 塗被紙用顔料分散剤
JPH0952921A (ja) * 1995-08-16 1997-02-25 Denki Kagaku Kogyo Kk 無機顔料用分散剤
SE506674C2 (sv) * 1996-06-05 1998-01-26 Akzo Nobel Surface Chem Komposition, användning av en cellulosaeter som förtjockare och framställning av en belagd cellulosabaserad ytformad produkt
FI108283B (fi) * 1997-01-13 2001-12-31 M Real Oyj Menetelmä paperin ja kartongin päällystämiseksi
CA2294034C (fr) * 1997-06-13 2006-11-28 Jan Gerardus Batelaan Ethers de cellulose anioniques modifies quant a leur hydrophobie
JP3933293B2 (ja) * 1998-03-05 2007-06-20 サカタインクス株式会社 水性顔料分散体およびそれを用いた水性印刷インキ組成物

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03004767A1 *

Also Published As

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CA2450706C (fr) 2011-03-08
CN1232696C (zh) 2005-12-21
JP2004533524A (ja) 2004-11-04
CN1522327A (zh) 2004-08-18
JP3979534B2 (ja) 2007-09-19
CA2450706A1 (fr) 2003-01-16
WO2003004767A1 (fr) 2003-01-16

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