Classifications

• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
  • D21H21/02—Agents for preventing deposition on the paper mill equipment, e.g. pitch or slime control
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
  • B01F23/50—Mixing liquids with solids
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K3/00—Use of inorganic substances as compounding ingredients
  • C08K3/34—Silicon-containing 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
  • C09C1/02—Compounds of alkaline earth metals or magnesium
  • C09C1/027—Barium sulfates
• • 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
  • C09C1/28—Compounds of silicon
• • 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
  • C09C1/28—Compounds of silicon
  • C09C1/30—Silicic acid
• • 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
  • C09C1/40—Compounds of aluminium
• • 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
  • C09C1/402—Satin white, modifications thereof, e.g. carbonated or silicated; Calcium sulfoaluminates; Mixtures thereof, e.g. with calcium carbonate or kaolin
• • 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
  • C09C1/405—Compounds of aluminium containing combined silica, e.g. mica
• • 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
  • C09C1/407—Aluminium oxides or hydroxides
• • 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
  • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
  • D21H17/63—Inorganic compounds
  • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
  • D21H17/69—Water-insoluble compounds, e.g. fillers, pigments modified, e.g. by association with other compositions prior to incorporation in the pulp or paper
• • 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
  • C01P2006/00—Physical properties of inorganic compounds
  • C01P2006/12—Surface area
• • 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
  • C09C3/04—Physical treatment, e.g. grinding, treatment with ultrasonic vibrations
  • C09C3/041—Grinding
• • 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
  • D21H17/63—Inorganic compounds
  • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
  • D21H17/675—Oxides, hydroxides or carbonates
• • 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
  • D21H17/63—Inorganic compounds
  • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
  • D21H17/68—Water-insoluble compounds, e.g. fillers, pigments siliceous, e.g. clays

Definitions

• the invention relates first of all to a new process for the treatment of mineral materials, in particular talc and / or natural or synthetic calcium carbonate modified chemically and / or mechanically, by means of at least one amphoteric polymer, with a view to to improve the ability of said mineral materials to decrease the amount of natural and organic colloids in the papermaking process. ;
• a second object of the invention resides in the mineral materials thus treated and obtained from the process according to the invention.
• the third, fourth and fifth subject of the invention consist of dry powders, aqueous suspensions and granules of treated mineral matter, obtained from the process according to the invention.
• a final subject of the invention is the use of said mineral materials treated from the process according to the invention as a reducing agent for the amount of natural and organic colloids in the manufacturing process of the paper sheet.
• the method of manufacturing a sheet of paper (still referred to herein as the "papermaking process") generates a large number of colloidal species consisting of hydrophobic particles totally or partially insoluble in water.
• colloids are either of natural origin and consist of a large variety of long-chain hydrophobic macromolecules (based on fatty acids, esters, alcohols, etc.) commonly called “pitch” according to the English term. well known to those skilled in the art, or of synthetic origin and consisting of sticky polymers that are frequently encountered in the paper industry and commonly called “stickies” according to the other English term well known to man of career.
• US Pat. No. 5,989,392 discloses the use of cationic polymers which are quaternary polyammoniums consisting of a cationic monomer and a crosslinking monomer, in order to reduce the amount of undesirable colloids in the paper pulp. .
• the second way that limits the amount of unwanted colloids is the implementation of a mineral additive, optionally treated.
• mineral materials can be used for this purpose, such as in particular calcium carbonate, as mentioned in the document “Adsorption of anionic dissolved and colloidal substances on calcium carbonate fillers “(Tappi Journal, 83 (7), 2000, pp 72-73), although talc is the preferred mineral material for this purpose, as indicated in the document” Talc as a pitch control agent in the paper industry “( Kam Pa Gikyoshi, 53 (9), 1999, pp 1133-1142), or in “Productivity and quality enhancement of SC papers with talc” (PAPTAC Annual Meeting, 88 th, Montreal, QC, Canada, Jan.
• WO 89/06429 which describes a method for reducing the amount of undesirable colloids by using a talc on which a cationic polymer is adsorbed, the resulting particle having a zeta potential greater than or equal to + 30 mV.
• the authors of this document had already noticed that the talc particles thus treated with cationic polymers proved to be more effective than the cationic polymers themselves, as agents reducing the amount of unwanted colloids (page 15, lines 19). -23).
• the examples indicate that the adsorption of the cationic polymer on the talc particle takes place during a simple mixing process.
• polymers are amphoteric polymers, consisting of:
• the solution thus proposed is less expensive and less dangerous (in terms of ecotoxicology) than the solutions based on the use of a cationic polymer as a mineral material treatment agent.
• amphoteric polymers used in the present invention allow, for mineral substances and in particular for a talc and / or calcium carbonate of any kind (that is to say, in particular, whatever either its particle size and its specific surface, or if it was optionally modified chemically or mechanically), to treat it in order to improve its properties of reducing agent of the unwanted colloids: in this sense, the amphoteric polymers put into According to the present invention, it is possible to increase the reducing agent properties of undesirable colloids for mineral substances and in particular for any talc and / or calcium carbonate.
• talc and / or a calcium carbonate modified chemically and / or mechanically it intends to designate according to the vocabulary well known to those skilled in the art, talc and / or carbonate having undergone at least one modification stage chemical - such as treatment with an acid - and / or at least one step of mechanical modification - such as grinding or delamination -, without these examples having a limiting nature as to the nature of said chemical modification and / or mechanical).
• the process developed by the Applicant has the advantage of being extremely flexible for the skilled person. Indeed, the technical solutions consisting of using a talc treated with a cationic polymer rely exclusively on treatment processes by simple mixing of the mineral material in aqueous suspension with said cationic polymers. However, the skilled person must also meet a number of requirements on the part of the end user that is the paper manufacturer. These requirements can be translated through the different unit processing steps that can undergo the mineral material, before being sent to the end user. As such, said mineral material can undergo one or more of the following operations:
• a mixing step when said mineral material is already present in the form of an aqueous suspension optionally containing pulp, the objective being here to allow the end user to treat an aqueous suspension of mineral material directly during the course of the papermaking process, a suspension stage, when said mineral material is in the form of a dry powder, the objective being to deliver to the user a liquid product,
• a grinding step in a dry medium or in an aqueous medium, the objective being to provide the end-user with a mineral material of reduced particle size and a higher specific surface area
• a drying step when said mineral material was in aqueous suspension, the objective being to deliver to the end user a product in the form of a dry powder, a granulation step, the objective being to deliver to the end user products in the form of granules.
• the Applicant can also cite the document WO 91/09067 which describes, with a view to obtaining a stable aqueous suspension of mineral matter which does not sediment, having a high dry matter content as well as finely divided mineral matter, the setting use of water-soluble and amphoteric polymers as dispersion and / or grinding agent for said mineral substances.
• EP 1 294 476 which describes the use of a weakly anionic and water-soluble copolymer, as dispersing agent and / or aid for the grinding of pigments and / or mineral fillers in aqueous suspension, on the one hand a low Zeta potential to the aqueous suspensions of said fillers and / or pigments and on the other hand providing electro-steric stabilization of said suspensions.
• document 1 572 764 which describes the use of a weakly ionic and water-soluble copolymer as an agent for grinding mineral matter in aqueous suspension, making it possible to obtain aqueous suspensions of these said refined materials, of concentration a high dry matter with a low Brookfleld TM viscosity and stable over time having the property of presenting a pigment surface whose ionic charge, determined by ionic titration, is low.
• a first object of the invention is a process for treating mineral materials, with at least one polymer, said polymer being brought into contact with said mineral materials:
• an aqueous suspension of mineral matter optionally containing pulp of mechanical and / or thermomechanical and / or chemical nature and / or recycled pulp, and / or during a step of suspending an aqueous suspension of mineral materials, initially present in the form of dry powder, and / or during a step of grinding mineral matter, in a dry medium or in an aqueous medium, and / or during a step of drying an aqueous suspension of mineral matter, and / or during a step of granulation of mineral matter,
• said polymer is an amphoteric polymer, consisting of:
• anionic monomer which is an anionic monomer with ethylenic unsaturation and monocarboxylic functional group in the acid or salified state, chosen from monomers with ethylenic unsaturation and monocarboxylic function, and preferably from acrylic acid, methacrylic acid , cro tonic, isocrotonic, cinnamic or else semiesters of diacids such as C 1 to C 4 monoesters of maleic or itaconic acids, or selected from monomers with ethylenic unsaturation and dicarboxylic function in the acid or salified state, and preferentially among itaconic acid, maleic acid, fumaric acid, mesaconic acid, citraconic acid or anhydrides of carboxylic acids, such as maleic anhydride or chosen from ethylenically unsaturated monomers with a sulphonic function in the acidic or salified state, and preferentially among acrylamido-2-methyl-2-propanesul
• nonionic monomer chosen from N- [3- (dimethylamino) propyl] acrylamide or N- [3- (dimethylamino) propyl] methacrylamide, unsaturated esters such as N-methacrylate; [2- (dimethylamino) ethyl], or N- [2- (dimethylamino) ethyl] acrylate, or from acrylamide or methacrylamide and mixtures thereof, alkyl acrylates or methacrylates, vinyls, and preferentially vinyl acetate, vinylpyrrolidone, styrene, p-methylstyrene and their derivatives, or the monomers of formula (I):
• m and p represent a number of alkylene oxide units of less than or equal to 150
• n represents a number of ethylene oxide units less than or equal to
• q represents an integer at least equal to 1 and such that 5 ⁇ (m + n + p) q ⁇
• R 1 represents hydrogen or the methyl or ethyl radical
• R 2 represents hydrogen or the methyl or ethyl radical
• R represents a radical containing a polymerizable unsaturated functional group, preferably belonging to the vinyl group as well as to the group of acrylic, methacrylic, maleic, itaconic, crotonic and vinylphthalic esters, as well as to the group of unsaturated urethanes such as acrylurethanes, methacrylurethane, ⁇ ⁇ -dimethylisopropenylbenzylurethane, allyl urethane, as well as the group of substituted or unsubstituted allylic or vinyl ethers, or else the group of ethylenically unsaturated amides or imides,
• R ' represents hydrogen or a hydrocarbon radical having 1 to 40 carbon atoms.
• amphoteric polymers are obtained by known methods of radical polymerization in solution, in direct or inverse emulsion, in suspension or precipitation in appropriate solvents, in the presence of catalytic systems and known transfer agents, or by controlled radical polymerization processes and preferentially by controlled polymerization with nitroxides (NMP) or by cobaloxymes, radical atom transfer polymerization (ATRP), derivative-controlled radical polymerization sulfur, selected from carbamates, dithioesters or trithiocarbonates (RAFT) or xanthates.
• NMP nitroxides
• ATRP radical atom transfer polymerization
• RAFT trithiocarbonates
• amphoteric polymers are totally acidic, or totally or partially neutralized with a neutralization agent chosen from hydroxides of sodium, of potassium, hydroxides and / or oxides of calcium and magnesium. , ammonia, or mixtures thereof, preferably with a neutralizing agent selected from sodium hydroxide, potassium hydroxide, ammonia, or mixtures thereof, very preferably with a neutralizing agent which is ammonia.
• a neutralization agent chosen from hydroxides of sodium, of potassium, hydroxides and / or oxides of calcium and magnesium.
• amphoteric polymers may be optionally before or after their total or partial neutralization, be treated and separated into several phases, according to static or dynamic methods known to those skilled in the art, by one or more polar solvents preferentially belonging to the group consisting of water, methanol, ethanol, propanol, isopropanol, butanols, acetone, tetrahydrofuran or their mixtures.
• polar solvents preferentially belonging to the group consisting of water, methanol, ethanol, propanol, isopropanol, butanols, acetone, tetrahydrofuran or their mixtures.
• One of the two phases then corresponds to the polymers used according to the invention.
• the process according to the invention is also characterized in that the amphoteric polymers can be dried.
• the process according to the invention is also characterized in that the mineral materials are chosen from talc and natural or precipitated calcium carbonate, said talc and said carbonate possibly being modified chemically and / or mechanically, dolomites, kaolin , gypsum, lime, magnesia, titanium dioxide, satin white, aluminum trioxide or aluminum trihydroxide, silicas, mica, carbonate and barium sulfate, and the mixture of between them, such as talc-calcium carbonate, calcium carbonate-kaolin mixtures, or mixtures of calcium carbonate with aluminum trihydroxide or aluminum trioxide, or mixtures with synthetic fibers or or co-structures of minerals such as talc-calcium carbonate or talc-titanium co-structures, or mixtures thereof, and preferably in that they are selected from talc t natural or precipitated calcium carbonate, said talc and said carbonate being optionally chemically modified and / or mechanically, or mixtures thereof, and in that these mineral materials are very
• a second subject of the invention consists of treated mineral materials, characterized in that the treatment agent is an amphoteric polymer, consisting of:
• anionic monomer which is an anionic monomer with ethylenic unsaturation and monocarboxylic functional group in the acid or salified state, chosen from monomers with ethylenic unsaturation and monocarboxylic function, and preferably from acrylic acid, methacrylic acid , crotonic, isocrotonic, cinnamic or the diacid hemiesters such as C 1 -C 4 monoesters of maleic or itaconic acids, or selected from ethylenically unsaturated monomers and dicarboxylic function in the acid or salified state, and preferably among itaconic acid, maleic acid, fumaric acid, mesaconic acid, citraconic acid or anhydrides of carboxylic acids, such as maleic anhydride or chosen from ethylenically unsaturated monomers with a sulphonic function in the acidic or salified state, and preferably from acrylamido-2-methyl-
• nonionic monomer chosen from N- [3- (dimethylamino) propyl] acrylamide or N- [3- (dimethylamino) propyl] methacrylamide, unsaturated esters such as N-methacrylate; [2- (dimethylamino) ethyl], or N- [2- (dimethylamino) ethyl] acrylate, or from acrylamide or methacrylamide and mixtures thereof, alkyl acrylates or methacrylates, vinyls, and preferentially vinyl acetate, vinylpyrrolidone, styrene, para-methylstyrene and their derivatives, or the monomers of formula (I):
• n and p represent a number of alkylene oxide units of less than or equal to 150, n represents a number of ethylene oxide units less than or equal to
• q represents an integer at least equal to 1 and such that 5 ⁇ (m + n + p) q ⁇
• R 1 represents hydrogen or the methyl or ethyl radical
• R 2 represents hydrogen or the methyl or ethyl radical
• R represents a radical containing a polymerizable unsaturated functional group, preferably belonging to the vinyl group as well as to the group of acrylic, methacrylic, maleic, itaconic, crotonic and vinylphthalic esters, as well as to the group of unsaturated urethanes such as acrylurethanes, methacrylurethane, ⁇ ⁇ -dimethylisopropenylbenzylurethane, allyl urethane, as well as the group of substituted or unsubstituted allylic or vinyl ethers, or else the group of ethylenically unsaturated amides or imides,
• R ' represents hydrogen or a hydrocarbon radical having 1 to 40 carbon atoms
• Said mineral materials are also characterized in that the amphoteric polymers are obtained by known methods of radical polymerization in solution, in direct or inverse emulsion, in suspension or precipitation in appropriate solvents, in the presence of catalytic systems and transfer agents. known, or by controlled radical polymerization processes and preferably by controlled polymerization with nitroxides (NMP) or cobaloxymes, polymerization by radical atom transfer (ATRP), radical polymerization controlled by sulfur derivatives, selected from carbamates, dithioesters or trithiocarbonates (RAFT) or xanthates.
• NMP nitroxides
• ATRP radical atom transfer
• sulfur derivatives selected from carbamates, dithioesters or trithiocarbonates (RAFT) or xanthates.
• Said mineral materials are also characterized in that the amphoteric polymers are completely acidic or totally or partially neutralized with a neutralization agent chosen from hydroxides of sodium, of potassium, hydroxides and / or oxides of calcium, of magnesium, and ammonia, or mixtures thereof, preferably with a neutralizing agent selected from sodium hydroxide, potassium hydroxide, ammonia, or mixtures thereof, very preferably with a neutralizing agent which is ammonia.
• a neutralization agent chosen from hydroxides of sodium, of potassium, hydroxides and / or oxides of calcium, of magnesium, and ammonia, or mixtures thereof, preferably with a neutralizing agent selected from sodium hydroxide, potassium hydroxide, ammonia, or mixtures thereof, very preferably with a neutralizing agent which is ammonia.
• Said mineral materials are also characterized in that the amphoteric polymers may be optionally before or after their total or partial neutralization, treated and separated into several phases, according to static or dynamic processes known to those skilled in the art, by one or more solvents.
• polar preferably belonging to the group consisting of water, methanol, ethanol, propanol, isopropanol, butanols, acetone, tetrahydrofuran or mixtures thereof.
• One of the two phases then corresponds to the polymers used according to the invention.
• the treated talc is also characterized in that the amphoteric polymers can be dried.
• the mineral materials according to the invention are also characterized in that they are chosen from talc and natural or precipitated calcium carbonate, said talc and said carbonate possibly being modified chemically and / or mechanically, dolomites, kaolin , gypsum, lime, magnesia, titanium dioxide, satin white, aluminum trioxide or aluminum trihydroxide, silicas, mica, carbonate and barium sulfate, and the mixture of between them, such as talc-calcium carbonate, calcium carbonate-kaolin mixtures, or mixtures of calcium carbonate with aluminum trihydroxide or aluminum trioxide, or mixtures with synthetic fibers or or co-structures of minerals such as talc-calcium carbonate or talc-titanium co-structures, or mixtures thereof, and preferably in that they are selected from talc and natural or precipitated calcium carbonate, talc and said carbonate being optionally chemically and / or mechanically modified, or mixtures thereof, and in that these mineral materials are very preferably talc
• a third object of the invention is a dry powder of treated mineral materials, characterized in that the treated mineral materials are those of the present invention.
• a fourth object of the invention is a granule of treated mineral materials, characterized in that the treated mineral materials are those of the present invention.
• a fifth object of the invention is an aqueous suspension of treated mineral materials, optionally containing pulp of mechanical and / or thermomechanical and / or chemical nature and / or recycled pulp, characterized in that the treated mineral materials are those of the present invention.
• a sixth and last object of the invention is the use as a reducing agent of the amount of undesirable colloids, in the process for producing a sheet of paper, of mineral matter treated according to the invention, of a dry powder of mineral materials treated according to the invention, a granule of mineral matter treated according to the invention and an aqueous suspension of mineral matter treated according to the invention.
• the polymolecularity indices and the average molecular weights of the polymers are determined according to the method explained below.
• the average molecular weights and the polymolecularity index are determined by a size exclusion chromatography (CES) method.
• CES size exclusion chromatography
• a test portion of the polymer solution corresponding to 90 mg of dry matter is introduced into a bottle of 10 ml.
• the mobile phase is added, added with 0.04% THF, to a total mass of 10 g.
• the composition of this mobile phase is as follows: NaNO 3 : 0.2 mol / L, CH 3 COOH: 0.5 mol / L, acetonitrile 5% volume.
• the CES chain is composed of a Waters TM 510 type isocratic pump, the flow rate of which is set to 0.8 mL / min, a Waters 717+ sample changer, an oven containing a precolumn type "Guard Column Ultrahydrogel Waters TM ", followed by a set of columns 7.8 mm in internal diameter and 30 cm in length of type” Ultrahydrogel Waters TM “, whose nominal porosities are, in the order of their connection: 2000, 1000, 500 and 250 ⁇ .
• Detection is provided by a Waters TM 410 differential refractometer. The temperature of the oven and detector is regulated at 35 ° C. Acquisition and processing of the chromatogram is performed using the PSS WinGPC Scientific v 4.02 software.
• the CES is calibrated by a series of poly (DADMAC) standards provided by Polymer Standards Service TM.
• the calibration curve is of linear type and takes into account the correction obtained thanks to the flow rate marker (THF).
• This example illustrates the process according to the invention in which an amphoteric polymer is used to treat a mineral matter which is a talc, during a stage of aqueous suspension of said talc (this suspending step being carried out according to the techniques well known to those skilled in the art).
• the talc implemented is Finntalc TM P05 marketed by the company MONDO MINERALS, with a median diameter of 2.2 ⁇ m (as determined from a Sedigraph TM 5100 device marketed by MICROMERITICS TM) and specific surface area. BET equal to 10.0 m 2 / g (as measured from a Flowsorb TM II device marketed by MICROMERITICS TM).
• This test is a reference.
• This wood pulp (France) is filtered through a filter with a pore diameter of 2 ⁇ m.
• This wood pulp has a dry extract equal to 12 g / l and a particle concentration equal to 65 x 10 6 particles per cm 3 measured by a counting cell sold by the company NEUBAUER TM.
• 200 g of water are added to 200 g of said liquor.
• the liquid phase is then centrifuged at 3000 rpm for 15 minutes, and its turbidity is measured from a Mettler TM DL 70 device equipped with Phototrode TM DP 660, both of these equipment being marketed by METTLER TOLEDO TM.
• the phototrode is calibrated beforehand at a value of 1000 mV in bi-permutated water.
• 10 g of the suspension obtained are mixed with 200 g of the liquor as described in test 1 and with 10 g of water, and the mixture is left stirring for 2 hours.
• the liquid phase is then separated from the solid phase by centrifugation at 3000 rpm for 15 minutes, and the turbidity of the liquid phase is measured from a Mettler TM DL 70 device equipped with Phototrode TM DP 660, both of these devices. being marketed by METTLER TOLEDO TM.
• the phototrode is calibrated beforehand at a value of 1000 mV in bi-permutated water.
• An aqueous dispersion of talc containing 40% by dry weight of talc is prepared in the presence of 1% by dry weight (measured with respect to the dry weight of talc) of an amphoteric polymer consisting of 50% by mole of MAPTAC (chloride [3- (methacrylamido) propyl] trimethylammonium) and 50 mol% acrylic acid.
• MAPTAC chloride [3- (methacrylamido) propyl] trimethylammonium
• the phototrode is calibrated beforehand at a value of 1000 mV in bi-permutated water.
• An aqueous dispersion of talc containing 40% by dry weight of talc is prepared in the presence of 1% by dry weight (measured with respect to the dry weight of talc) of an amphoteric polymer consisting of 60% by mole of MADQUAT (sodium chloride). [2- (methacryloyloxy) ethyl] trimethyl ammonium) and 40 mol% acrylic acid.
• 10 g of the dispersion obtained are mixed with 200 g of the liquor as described in test 1 and with 10 g of water, and the mixture is left to act for 2 hours with stirring.
• the liquid phase is then separated from the solid phase by centrifugation at 3000 rpm for 15 minutes, and the turbidity of the liquid phase is measured from a Mettler TM DL 70 device equipped with Phototrode TM DP 660, both of these devices. being marketed by METTLER TOLEDO TM.
• the phototrode is calibrated beforehand at a value of 1000 mV in bi-permutated water.
• the difference between the 1000 mV value (the phototrode calibration value when immersed in the bi-permuted water) and the measured turbidity value for each sample is calculated: the lower the difference. the lower the amount of undesirable colloids remaining in the sample.
• This example illustrates the process according to the invention in which an amphoteric polymer is used to treat a mineral material which is a talc, during a stage of aqueous suspension of said talc.
• the talc used is Finntalc TM P15 marketed by the company MONDO MINERALS, with a median diameter equal to 5.5 ⁇ m (as determined from a Sedigraph TM 5100 device marketed by MICROMERITICS TM) and specific surface area. BET equal to 6.0 m 2 / g (as measured from a Flowsorb TM II device marketed by MICROMERITICS TM). For this series of tests, test no. 1 is still the reference. In addition to the turbidimetric measurement carried out during test n ° 1, a Chemical Oxygen Demand (COD) measurement is also performed which represents the concentration (mg / L) of oxygen equivalent to the quantity of dichromate consumed. dissolved and suspended materials (1 mole of K 2 Cr 2 O 7 corresponds to 1 mole of oxygen).
• COD Chemical Oxygen Demand
• COD COD is carried out according to the ISO 6060 standard, by implementing a Spectroquant Nova 60 photometer marketed by MERCK TM. This measurement is representative of the amount of undesirable colloids remaining in the liquid phase: the higher this value, the greater the amount of undesirable colloids remaining in suspension.
• 10 g of the suspension obtained are mixed with 200 g of the liquor as described in test 1 and with 10 g of water, and the mixture is left stirring for 2 hours.
• the liquid phase is then separated from the solid phase by centrifugation at 3000 rpm for 15 minutes, and the turbidity of the liquid phase is measured from a Mettler TM DL 70 device equipped with Phototrode TM DP 660, both of these devices. being marketed by METTLER TOLEDO TM.
• the phototrode is calibrated beforehand at a value of 1000 mV in bi-permutated water.
• a measurement of COD is also carried out on the liquid phase, according to the method previously described.
• An aqueous dispersion of talc, containing 40% by dry weight of talc, is produced in the presence of 1% by dry weight (measured with respect to the dry weight of talc) of a polymer.
• amphoteric compound consisting of 50 mol% of MAPTAC and 50 mol% of acrylic acid.
• the liquid phase is then separated from the solid phase by centrifugation at 3000 rpm for 15 minutes, and the turbidity of the liquid phase is measured from a Mettler TM DL 70 device equipped with Phototrode TM DP 660, both of these devices. being marketed by METTLER TOLEDO TM.
• the phototrode is calibrated beforehand at a value of 1000 mV in bi-permutated water.
• a measurement of COD is also carried out on the liquid phase, according to the method previously described.
• An aqueous dispersion of talc containing 40% by dry weight of talc is prepared in the presence of 1% by dry weight (measured with respect to the dry weight of talc) of an amphoteric polymer consisting of 60% by mole of MADQUAT and 40% by weight. mole% acrylic acid.
• 10 g of the dispersion obtained are mixed with 200 g of the liquor as described in test 1 as well as with 10 g of water and allowed to act for 2 hours with stirring
• the liquid phase is then separated from the solid phase by centrifugation at 3000 rpm for 15 minutes, and the turbidity of the liquid phase is measured from a Mettler TM DL 70 device equipped with Phototrode TM DP 660, both of these devices. being marketed by METTLER TOLEDO TM.
• the phototrode is calibrated beforehand at a value of 1000 mV in bi-permutated water.
• An aqueous dispersion of talc containing 40% by dry weight of talc is prepared in the presence of 1% by dry weight (measured with respect to the dry weight of talc) of an amphoteric polymer consisting of 60% by mole of MADQUAT and 40% by weight. mole% acrylic acid.
• 10 g of the dispersion obtained are mixed with 200 g of the liquor as described in test 1 as well as with 10 g of water and allowed to act for 2 hours with stirring
• the liquid phase is then separated from the solid phase by centrifugation at 3000 rpm for 15 minutes, and the turbidity of the liquid phase is measured from a Mettler TM DL 70 device equipped with Phototrode TM DP 660, both of these devices. being marketed by METTLER TOLEDO TM.
• the phototrode is calibrated beforehand at a value of 1000 mV in bi-permutated water.
• a measurement of COD is also carried out on the liquid phase, according to the method previously described.
• An aqueous dispersion of talc containing 40% by dry weight of talc is prepared in the presence of 1% by dry weight (measured with respect to the dry weight of talc) of an amphoteric polymer consisting of 60% by mole of MADQUAT and 40% by weight. mole% acrylic acid.
• 10 g of the dispersion obtained are mixed with 200 g of the liquor as described in test 1 and with 10 g of water, and the mixture is left to act for 2 hours with stirring.
• the liquid phase is then separated from the solid phase by centrifugation at 3000 rpm for 15 minutes, and the turbidity of the liquid phase is measured from a Mettler TM DL 70 device equipped with Phototrode TM DP 660, both of these devices. being marketed by METTLER TOLEDO TM.
• the phototrode is calibrated beforehand at a value of 1000 mV in bi-permutated water.
• a measurement of COD is also carried out on the liquid phase, according to the method previously described.
• This example illustrates the process according to the invention in which an amphoteric polymer is used to treat a mineral material which is a talc, during a stage of aqueous suspension of said talc.
• the talc used is a Finnish talc with a median diameter equal to 30 ⁇ m (as determined from a Sedigraph TM 5100 device marketed by the company.
• test no. 1 is still the reference.
• 10 g of the suspension obtained are mixed with 200 g of the liquor as described in test 1, as well as with 10 g of water, and allowed to act for 2 hours with stirring.
• the liquid phase is then separated from the solid phase by centrifugation at 3000 rpm for 15 minutes, and the turbidity of the liquid phase is measured from a Mettler TM DL 70 device equipped with Phototrode TM DP 660, both of these devices. being marketed by METTLER TOLEDO TM.
• the phototrode is calibrated beforehand at a value of 1000 mV in bi-permutated water.
• An aqueous dispersion of talc containing 40% by dry weight of talc is prepared in the presence of 1% by dry weight (measured with respect to the dry weight of talc) of an amphoteric polymer consisting of 50% by mole of MADQUAT and 50 mol% acrylic acid.
• 10 g of the dispersion obtained are mixed with 200 g of the liquor as described in test 1 and with 10 g of water, and the mixture is left to act for 2 hours with stirring.
• the liquid phase is then separated from the solid phase by centrifugation at 3000 rpm for 15 minutes, and the turbidity of the liquid phase is measured from a Mettler TM DL 70 device equipped with Phototrode TM DP 660, both of these devices. being marketed by METTLER TOLEDO TM.
• the phototrode is calibrated beforehand at a value of 1000 mV in bi-permutated water.
• aqueous dispersion of talc containing 40% by dry weight of talc is prepared in the presence of 1% by dry weight (measured with respect to the dry weight of talc) of an amphoteric polymer consisting of 50% by mole of MAPTAC and 50% by weight. mole% acrylic acid.
• 10 g of the dispersion obtained are mixed with 200 g of the liquor as described in test 1 and with 10 g of water, and the mixture is left to act for 2 hours with stirring.
• the liquid phase is then separated from the solid phase by centrifugation at 3000 rpm for 15 minutes, and the turbidity of the liquid phase is measured from a Mettler TM DL 70 device equipped with Phototrode TM DP 660, both of these devices. being marketed by METTLER TOLEDO TM.
• the phototrode is calibrated beforehand at a value of 1000 mV in bi-permutated water.
• An aqueous dispersion of talc containing 40% by dry weight of talc is prepared in the presence of 1% by dry weight (measured with respect to the dry weight of talc) of an amphoteric polymer consisting of 60% by mole of MADQUAT and 40% by weight. mole% acrylic acid.
• 10 g of the dispersion obtained are mixed with 200 g of the liquor as described in test 1 and with 10 g of water, and the mixture is left to act for 2 hours with stirring.
• the liquid phase is then separated from the solid phase by centrifugation at 3000 rpm for 15 minutes, and the turbidity of the liquid phase is measured from a Mettler TM DL 70 device equipped with Phototrode TM DP 660, both of these devices. being marketed by METTLER TOLEDO TM.
• the phototrode is calibrated beforehand at a value of 1000 mV in bi-permutated water.
• An aqueous dispersion of talc containing 40% by dry weight of talc is prepared in the presence of 1% by dry weight (measured with respect to the dry weight of talc) of an amphoteric polymer consisting of 10% by mole of MAPTAC, 40% by weight of mole% of MADQUAT, and 50 mol% of acrylic acid.
• 10 g of the dispersion obtained are mixed with 200 g of the liquor as described in test 1 and with 10 g of water, and the mixture is left to act for 2 hours with stirring.
• the liquid phase is then separated from the solid phase by centrifugation at 3000 rpm for 15 minutes, and the turbidity of the liquid phase is measured from a Mettler TM DL 70 device equipped with Phototrode TM DP 660, both of these devices. being marketed by METTLER TOLEDO TM.
• the phototrode is calibrated beforehand at a value of 1000 mV in bi-permutated water.
• the set of characteristics and results corresponding to tests No. 10 to 14 are reported in Table 3.
• This example illustrates the process according to the invention in which an amphoteric polymer is used to treat a mineral material which is a talc, during a step of grinding said talc in an aqueous medium.
• the talc implemented is Comital TM GR45 marketed by the company of the same name, with a median diameter equal to 14.6 ⁇ m (as determined from a Sedigraph TM 5100 device marketed by MICROMERITICS TM) and surface BET specific equal to 3.22 m 2 / g (as measured from a Flowsorb TM II device marketed by MICROMERITICS TM).
• test no. 1 is still the reference.
• the phototrode is calibrated beforehand at a value of 1000 mV in bi-permutated water.
• the value of the median diameter is 9 ⁇ m (as determined from a Sedigraph TM 5100 device marketed by MICROMERITICS TM).
• 10 g of water and 10 g of the dispersion obtained are mixed with 200 g of the liquor as described in test 1 and allowed to act for 2 hours with stirring.
• the liquid phase is then separated from the solid phase by centrifugation at 3000 rpm for 15 minutes, and the turbidity of the liquid phase is measured from a Mettler TM DL 70 equipped with Phototrode TM DP 660, both of these devices being marketed by METTLER TOLEDO TM.
• the phototrode is calibrated beforehand at a value of 1000 mV in bi-permutated water.
• This example illustrates the process according to the invention in which an amphoteric polymer is used to treat a mineral material which is a natural calcium carbonate or precipitated, during a step of suspending said calcium carbonate.
• the reference is constituted by the test n ° 1.
• the calcium carbonate used is a calcite from Orgon (France) marketed by OMYA TM under the name BL 200. 5 g of the suspension obtained are mixed with 200 g of the liquor as described in the test. No. 1 and 15 g of water, and allowed to act for 2 hours with stirring.
• the liquid phase is then separated from the solid phase by centrifugation at 3000 rpm for 15 minutes, and the turbidity of the liquid phase is measured from a Mettler TM DL 70 device equipped with Phototrode TM DP 660, both of these devices. being marketed by METTLER TOLEDO TM.
• the phototrode is calibrated beforehand at a value of 1000 mV in bi-permutated water.
• An aqueous dispersion is produced of the same natural calcium carbonate as that used in test No. 17, containing 40% by dry weight of calcium carbonate, in the presence of 1% by dry weight (measured relative to the dry weight).
• calcium carbonate an amphoteric polymer consisting of 60 mol% of MADQUAT and 40 mol% of acrylic acid.
• the liquid phase is then separated from the solid phase by centrifugation at 3000 rpm for 15 minutes, and the turbidity of the liquid phase is measured from a Mettler TM DL 70 device equipped with Phototrode TM DP 660, both of these devices. being marketed by METTLER TOLEDO TM.
• the phototrode is calibrated beforehand at a value of 1000 mV in bi-permutated water.
• An aqueous suspension of natural calcium carbonate is prepared, containing 40% by dry weight of untreated calcium carbonate relative to the total weight of said suspension.
• the calcium carbonate used is a Carrara marble (Italy) sold by OMYA TM under the name Omyacarb TM IAV.
• the phototrode is calibrated beforehand at a value of 1000 mV in bi-permutated water.
• aqueous dispersion is produced of the same natural calcium carbonate as that used in test No. 18, containing 40% by dry weight of calcium carbonate, in the presence of 1% by dry weight (measured relative to the dry weight).
• the liquid phase is then separated from the solid phase by centrifugation at 3000 rpm for 15 minutes, and the turbidity of the liquid phase is measured from a Mettler TM DL 70 device equipped with Phototrode TM DP 660, both of these devices. being marketed by METTLER TOLEDO TM.
• the phototrode is calibrated beforehand at a value of 1000 mV in bi-permutated water.
• the precipitated calcium carbonate used is Socal TM P3 marketed by SOLV AY TM.
• the liquid phase is then separated from the solid phase by centrifugation at 3000 rpm for 15 minutes, and the turbidity of the liquid phase is measured from a Mettler TM DL 70 device equipped with Phototrode TM DP 660, both of these devices. being marketed by METTLER TOLEDO TM.
• the phototrode is calibrated beforehand at a value of 1000 mV in bi-permutated water.
• Test No. 19 bis
• An aqueous dispersion is produced of the same precipitated calcium carbonate as that used in test No. 19, containing 40% by dry weight of calcium carbonate, in the presence of 1% by dry weight (measured with respect to the dry weight of calcium carbonate) of an amphoteric polymer consisting of 60 mol% of MADQUAT and
• the liquid phase is then separated from the solid phase by centrifugation at 3000 rpm for 15 minutes, and the turbidity of the liquid phase is measured from a Mettler TM DL 70 device equipped with Phototrode TM DP 660, both of these devices. being marketed by METTLER TOLEDO TM.
• the phototrode is calibrated beforehand at a value of 1000 mV in bi-permutated water.
• An aqueous suspension of chemically modified calcium carbonate is prepared containing 40% by dry weight of untreated calcium carbonate relative to the total weight of said suspension.
• the precipitated calcium carbonate used is marketed by OMYA TM under the name Omyasorb TM 7500; its specific surface area is equal to 38.4 m 2 / g as measured according to the BET method and its median diameter is equal to 1.33 ⁇ m as measured from a Sedigraph TM 5100 sold by the company MICROMERITICS TM.
• aqueous dispersion of the same calcium carbonate is made as that used in test No. 20, containing 40% by dry weight of calcium carbonate, in the presence of 1% by dry weight (measured with respect to the dry weight of calcium carbonate) of an amphoteric polymer consisting of 60 mol% of MADQUAT and 40 mol% of acrylic acid. Its weight-average molecular weight is 78,000 g / mol and its polymolecularity index is equal to 2.55.
• n ° 17, 17 bis, 18, 18 bis, 19, 19 bis, 20 and 20 bis the difference between the value 1000 mV (calibration value of the phototrode when it is immersed in the bi-permuted water) and the measured turbidity value for each sample: the lower the difference, the lower the amount of undesirable colloid remaining in the sample.
• This example illustrates the process according to the invention in which an amphoteric polymer is used to treat a mineral matter which is a talc, during a step of aqueous suspension of said talc (this suspending step being carried out according to techniques well known to those skilled in the art).
• the talc implemented is Finntalc TM P05 marketed by the company MONDO MINERALS, with a median diameter of 2.2 ⁇ m (as determined from a Sedigraph TM 5100 device marketed by MICROMERITICS TM) and specific surface area. BET equal to 10.0 m 2 / g (as measured from a Flowsorb TM II device marketed by MICROMERITICS TM).
• An aqueous dispersion of talc, containing 40% by dry weight of talc, is produced in the presence of 1% by dry weight (measured with respect to the dry weight of talc) of an amphoteric polymer consisting of 60% by mole of MADQUAT and of 40 mol% acrylic acid. Its weight-average molecular weight is 85,000 g / mol and its polymolecularity index is equal to 3.1.
• aqueous dispersion of talc containing 40% by dry weight of talc, is produced in the presence of 1% by dry weight (measured with respect to the dry weight of talc) of an amphoteric polymer consisting of 60% by mole of MADQUAT and of 40 mol% of methacrylic acid. Its weight-average molecular weight is 100,000 g / mol and its polymolecularity index is 3.5.
• aqueous dispersion of talc containing 40% by dry weight of talc is prepared in the presence of 1% by dry weight (measured with respect to the dry weight of talc) of an amphoteric polymer consisting of 60% by mole of MADQUAT, 20 mol% of acrylic acid and 20 mol% of methacrylic acid. Its weight-average molecular weight is 158,000 g / mol and its polymolecularity index is 3.6. Test n ° 24
• An aqueous dispersion of talc containing 40% by dry weight of talc is prepared in the presence of 1% by dry weight (measured with respect to the dry weight of talc) of an amphoteric polymer consisting of 50% by mole of APTAC ( acrylamidopropyltrimethylammonium chloride) and 50 mol% of methacrylic acid. Its weight-average molecular weight is 92,000 g / mol and its polymolecularity index is 3.6.
• APTAC acrylamidopropyltrimethylammonium chloride
• test n ° 21 to 24 The set of characteristics and results corresponding to the tests n ° 21 to 24 is reported in table 6, where the test n ° 1 still constitutes a reference without polymer and where the test n ° 2 still represents the prior art in which has been used untreated talc.
• This example illustrates the process according to the invention in which an amphoteric polymer is used to treat a mineral material which is a talc, during a step of granulating said talc.
• the talc implemented is Finntalc TM P05 marketed by the company MONDO MINERALS, with a median diameter of 2.2 ⁇ m (as determined from a Sedigraph TM 5100 device marketed by MICROMERITICS TM) and specific surface area. BET equal to 10.0 m 2 / g (as measured from a Flowsorb TM II device marketed by MICROMERITICS TM).
• Talc granules are produced by a conventional fluidized bed agglomeration process.
• the fluidized talc powder is moistened with an aqueous solution (optionally containing the treatment agent) at the inlet of a granulation chamber before being extruded in order to obtain extrudates with a diameter of approximately 3 to 5 mm. and of equal length of 2 to 3 times their diameter.
• the aqueous solution (optionally containing the treatment agent) is sprayed at the inlet of the granulation chamber to obtain granules containing about 10% moisture and a treatment rate of 1% of treatment agent ( relative to the dry talc) when the aqueous solution used contains said treatment agent.
• a granule of talc obtained by granulation with an aqueous solution containing no treatment agent. 4 g of granules are mixed with 200 g of the liquor as described in test 1 of example 1 and with 10 g of water, and the mixture is left to act for 2 hours with stirring. The liquid phase is then separated from the solid phase by centrifugation at 3000 rpm for 15 minutes, and the turbidity of the liquid phase is measured from a Mettler TM DL 70 equipped with Phototrode TM DP 660 (previously calibrated to a value of 1000 m V in bi-permuted water).
• This test illustrates the invention. It uses a granulate of talc obtained by granulation with an aqueous solution containing a treatment agent which is an amphoteric polymer consisting of 50% by mole of MAPTAC and 50% by mole of acrylic acid. Its weight-average molecular weight is 44,200 g / mol and its polymolecularity index is equal to 1.95.
• a treatment agent which is an amphoteric polymer consisting of 50% by mole of MAPTAC and 50% by mole of acrylic acid. Its weight-average molecular weight is 44,200 g / mol and its polymolecularity index is equal to 1.95.
• talc obtained by granulation with an aqueous solution containing a treatment agent which is an amphoteric polymer consisting of 60 mol% of MADQUAT and 40 mol% of acrylic acid. Its weight-average molecular weight is 78,000 g / mol and its polymolecularity index is equal to 2,65.
• a treatment agent which is an amphoteric polymer consisting of 60 mol% of MADQUAT and 40 mol% of acrylic acid. Its weight-average molecular weight is 78,000 g / mol and its polymolecularity index is equal to 2,65.
• talc obtained by granulation with an aqueous solution containing a treatment agent which is an amphoteric polymer consisting of 60 mol% of MADQUAT and 40 mol% of acrylic acid. Its weight-average molecular weight is 121,000 g / mol and its polymolecularity index is equal to 2.20.
• a treatment agent which is an amphoteric polymer consisting of 60 mol% of MADQUAT and 40 mol% of acrylic acid. Its weight-average molecular weight is 121,000 g / mol and its polymolecularity index is equal to 2.20.
• talc granules obtained are mixed with 200 g of the liquor as described in test 1 of example 1 and with 10 g of water, and let stand for 2 hours with stirring.
• the liquid phase is then separated from the solid phase by centrifugation at 3000 rpm for 15 minutes, and the turbidity of the liquid phase is measured from a Mettler TM DL 70 equipped with Phototrode TM DP 660 (previously calibrated at 1000 mV in bi-permuted water).
• a measurement of COD on the liquid phase is also carried out, according to the method described in Example 2.

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