EP1769035A2

EP1769035A2 - Novel dry mineral pigment containing calcium carbonate, aqueous suspension containing said pigment, and the uses thereof

Info

Publication number: EP1769035A2
Application number: EP05767456A
Authority: EP
Inventors: Matthias Buri; Rene Burkhalter; Peter Haldemann
Original assignee: Omya Development AG
Current assignee: Omya International AG
Priority date: 2004-06-11
Filing date: 2005-06-08
Publication date: 2007-04-04
Also published as: BRPI0511996A; EA010929B1; FR2871474B1; CN1965036A; KR101185660B1; KR20070024723A; MXPA06013856A; EA200700015A1; US20080022901A1; CA2565883C; NO344730B1; JP5687404B2; BRPI0511996B1; CA2565883A1; FR2871474A1; MY145933A; US10308813B2; AU2005252460A1; US20190241745A1; WO2005121257A3

Abstract

The invention relates to a method for producing a dry mineral pigment containing a product formed in situ by the multiple reaction of a calcium carbonate with the reaction product or products of said carbonate with at least one medium-strength to high-strength H3O+ ion donor; with the reaction product or products of said carbonate with gaseous CO2 formed in situ and/or from an external supply; and with at least one compound of formula R-X. The invention also relates to the mineral pigment obtained by said method, and to the applications thereof in the paint and/or plastics industries.

Description

NEW DRY MINERAL PIGMENT CONTAINING CALCIUM CARBONATE, AQUEOUS SUSPENSION CONTAINING IT AND USES THEREOF.

The present invention relates to the technical sector of mineral fillers and relates in particular to mineral pigments containing a dry product formed in situ by the multiple reaction between a calcium carbonate and the reaction product or products of said carbonate with one or more ion donors Moderately strong to strong H ₃ O ⁺ and the reaction product (s) of said carbonate with gaseous CO ₂ formed in situ and / or coming from an external supply and one or more compounds of formula RX, used in paint applications and / or plastic and / or coatings and / or sealants, in particular as a rheology regulating filler making it possible to control the viscosity while preserving the solidity of the polymeric materials, and more particularly in the automobile industry as a protective coating for the automobile underbody.

The invention also relates to a process for manufacturing a dry mineral pigment containing a product formed in situ by the multiple reaction between a calcium carbonate and the reaction product or products of said carbonate with one or more H ₃ ion donors O ⁺ moderately strong to strong and the reaction product (s) of said carbonate with gaseous CO ₂ formed in situ and / or coming from an external supply and one or more compounds of formula RX as well as the mineral pigment obtained by the process.

This dry mineral pigment according to the invention can optionally, before drying, be placed in aqueous suspension by means of an anionic electrolyte to obtain an aqueous anionic suspension of charge containing a product formed in situ by the multiple reaction between a calcium carbonate and the or the reaction products of said carbonate with one or more moderately strong to strong H ₃ O ⁺ ion donors and the reaction product (s) of said carbonate with CO ₂ gas formed in situ and / or coming from an external supply and one or more compounds of formula RX. This anionic aqueous suspension and the corresponding product after drying optionally contain one or more anionic electrolytes such as for example one or more dispersants. This dry mineral pigment according to the invention can optionally, before drying, be placed in aqueous suspension by means of a cationic electrolyte to obtain an aqueous cationic suspension of charge containing a product formed in situ by the multiple reaction between a calcium carbonate and the or the reaction products of said carbonate with one or more moderately strong to strong H ₃ O ⁺ ion donors and the reaction product (s) of said carbonate with CO ₂ gas formed in situ and / or coming from an external supply and one or more compounds of formula RX. This cationic aqueous suspension and the corresponding product after drying optionally contain one or more cationic electrolytes such as for example one or more dispersants.

This dry mineral pigment according to the invention can optionally, before drying, be placed in aqueous suspension by means of a slightly anionic electrolyte to obtain a slightly anionic aqueous suspension of charge containing a product formed in situ by the multiple reaction between a calcium carbonate. and the reaction product (s) of said carbonate with one or more moderately strong to strong H ₃ O ⁺ ion donors and the reaction product (s) of said carbonate with gaseous CO ₂ formed in situ and / or from a feed external and one or more compounds of formula RX.

This slightly anionic aqueous suspension and the corresponding product after drying optionally contain one or more slightly anionic electrolytes such as for example one or more dispersants.

The invention also relates to the use of said dry mineral pigment and of said aqueous suspensions of mineral pigment, in the fields of paint and / or plastic and / or coatings and / or sealants, and in particular as a rheology regulating filler. rigid plastisol and polyvinyl chloride (PVC) type formulations, in particular as a filler for controlling viscosity while retaining the solidity of rigid plastisol, PVC formulations, and in particular in underbody protective coatings for cars.

It also relates to plastisol, rigid PVC formulations and protective underbody coatings for cars containing said dry mineral pigment. Finally, it relates to paints and / or coatings and / or sealants containing said dry mineral pigment.

A person skilled in the art, who therefore seeks to control the rheology of the formulations used in the manufacture of bodywork while retaining the solidity of the polymers constituting the latter, knows patent application WO 00/20336 which offers him a solution by selection of the grain size of the load used, but this solution does not give him full satisfaction.

He also knows EP 377,149, the solution for improving rheology also does not satisfy him.

He is also aware of FR 2 407 216, which proposes as agents capable of modifying the rheological properties of plastisols of phosphoric ester derivatives constituted by the product of the neutralization of an excess of the esters obtained by esterification of phosphoric anhydride or of polyphosphoric acid with an organic derivative having at least one hydroxyl group.

However, all these documents do not allow a person skilled in the art to control the rheology of the formulations used in the manufacture of bodywork while retaining the solidity of the polymers constituting the latter.

Continuing its research in order to control the rheology of the formulations used in automobile bodies while retaining their solidity, the Applicant has surprisingly found that a dry mineral pigment containing a product formed in situ by the multiple reaction between a calcium carbonate and the reaction product (s) of said carbonate with one or more moderately strong to strong H ₃ O ⁺ ion donors and the reaction product (s) of said carbonate with gaseous CO ₂ formed in situ and / or originating an external power supply and one or more compounds of formula RX, makes it possible to regulate the rheology during the plastisol formulation and to reduce the weight of the plastisol obtained while retaining its solidity.

The Applicant has also developed a process for obtaining a dry mineral pigment containing a product formed in situ by the multiple reaction between a calcium carbonate and the reaction product (s) of said carbonate with one or more moderately strong to strong H ₃ O ⁺ ion donors and the reaction product (s) of said carbonate with gaseous CO ₂ formed in situ and / or originating from '' an external power supply and one or more compounds of formula RX, making it possible to obtain the abovementioned results in protective coatings for automobile underbody panels and / or excellent resistance to abrasion of aqueous paints.

An object of the invention is therefore a dry mineral pigment containing a product formed in situ by the multiple reaction between a calcium carbonate and the reaction product (s) of said carbonate with one or more ion donors H ₃ θ ⁺ moderately strong to strong and the reaction product (s) of said carbonate with CO ₂ gas formed in situ and / or coming from an external supply and one or more compounds of formula RX.

Another object of the invention is also a method of manufacturing said dry pigment.

Another subject of the invention relates to the aqueous suspension of the mineral pigment according to the invention.

The subject of the invention is also the dry mineral pigment obtained by the process according to the invention as well as its use in the fields of paint and / or plastic and / or coatings and / or sealants, and in particular as a filler regulating the rheology of plastisol and rigid polyvinyl chloride (PVC) type formulations, and very particularly as a filler allowing viscosity to be controlled while keeping the solidity of the polymers.

A more particular subject of the invention is the use of said dry mineral pigment and of said aqueous suspensions of mineral pigment, in the fields of paint and / or plastic and / or coatings and / or sealants, and in particular as a filler rheology regulator of rigid plastisol and polyvinyl chloride (PVC) type formulations, and very particularly as a filler allowing viscosity to be controlled while retaining the solidity of rigid plastisol, PVC formulations, and in particular in underbody protective coatings for cars. In addition, another subject of the invention is the plastisol or rigid PVC formulation containing the mineral pigment according to the invention.

Finally, another subject of the invention is the formulation of paint and / or putty and / or coating containing the mineral pigment according to the invention.

Thus, the dry mineral pigment according to the invention is characterized in that it contains a product formed in situ by the multiple reaction between a calcium carbonate and the reaction product (s) of said carbonate with one or more ion donors Moderately strong to strong H ₃ O ⁺ and the reaction product (s) of said carbonate with gaseous CO ₂ formed in situ and / or coming from an external supply and one or more compounds of formula RX.

In particular, the dry mineral pigment according to the invention is characterized in that the radical R of the compound or compounds of formula RX represents a saturated or unsaturated carbon radical having from 8 to 24 carbon atoms, such as the linear or branched groups alkyl, alkylaryl, arylalkyl, aryl, polyaryl or cyclic or mixtures thereof, and in that the group X of the compound or compounds of formula RX represents groups such as carboxyl, amine, hydroxyl, phosphonic, or their mixtures.

Even more particularly, the RX type compounds are chosen from fatty acids, fatty amines, saturated or unsaturated fatty alcohols, preferably having 8 to 24 carbon atoms such as in particular of the stearic, oleic, linoleic or myristic type. , octyl or their own mixtures and very preferably 16 to 18 carbon atoms, or their mixtures with synthetic or natural fatty compounds, preferably compounds of vegetable origin such as coconut oil or of animal origin such as tallow, and very preferably of plant origin.

The dry mineral pigment according to the invention is particularly characterized in that the moderately strong to strong H ₃ O ⁺ ion donor (s) are chosen from moderately strong to strong acids, or their mixtures generating H ₃ O ions ⁺ , and are preferably chosen from acids having a pK _{a of} less than or equal to 2.5 at 25 ° C. In a very particular variant, the dry mineral pigment according to the invention is characterized in that the strong acids are chosen from among the acids having a pK _a less than or equal to 0 at 25 ° C., such as sulfuric acid, hydrochloric acid or mixtures thereof.

In another very particular variant, the dry mineral pigment according to the invention is characterized in that the medium strong acid (s) are chosen from acids having a pK _a between 0 and 2.5 inclusive at 25 ° C and more particularly chosen from H ₂ SO ₃ , HSO4 ^" , H ₃ PO ₄ , or mixtures thereof and even more preferably from the medium strong acids forming salts of divalent cation, such as calcium, almost insoluble in water, that is to say - say solubility less than 1% by mass.

In particular, the mineral pigment according to the invention is characterized in that the calcium carbonate is a natural calcium carbonate and very preferably this natural calcium carbonate is chosen from a marble, a calcite, a chalk, a dolomite or their mixtures.

Also preferably the dry mineral pigment according to the invention is characterized in that it has a specific surface of between 1 m / g and 200 m / g measured according to the BET method, preferably between 5 m ² / g and 80 m ² / g and very preferably between 20 m ² / g and 60 m ² / g as well as a median diameter, determined by a measurement with Sedigraph ™ 5100, between 0.1 and 50 micrometers and preferably between 1 and 10 micrometers.

The dry mineral pigment according to the invention is further characterized in that the humidity rate is less than 1.50%, this humidity rate being determined after 2 hours of drying at 120 ° C in an oven under atmospheric pressure .

The process for manufacturing, according to the invention, a dry mineral pigment containing a product formed in situ by the multiple reaction between a calcium carbonate and the reaction product or products of said carbonate with one or more H ion donors ₃ θ ⁺ , moderately strong to strong and the reaction product (s) of said carbonate with gaseous CO ₂ formed in situ and / or coming from an external supply and one or several compounds of formula RX, is characterized in that it comprises the following stages:

a) The treatment of calcium carbonate in aqueous phase with the moderately strong to strong H ₃ O ⁺ ion donor (s) and the treatment with the gaseous CO ₂ formed in situ, treatment integral to step a),

b) The treatment of calcium carbonate in aqueous phase with the compound or compounds of formula RX, consisting in the addition, before and / or during and / or after step a), of the compound or compounds of formula RX and more particularly of the RX type compound (s) chosen from fatty acids, fatty amines, saturated or unsaturated fatty alcohols, preferably having 8 to 24 carbon atoms such as in particular of the stearic, oleic, linoleic, myristic, octyl type or their own mixtures and very preferably 16 to 18 carbon atoms, or mixtures thereof with synthetic or natural fatty compounds, preferably compounds of vegetable origin such as coconut oil or of animal origin such as tallow, and very preferably d 'vegetable origin,

c) optionally anionic or cationic or weakly anionic aqueous suspension of the product obtained in step b) at a dry matter concentration of between 1% and 80%, optionally using at least one anionic or cationic electrolyte or weakly anionic, possibly followed by a reconcentration,

d) optionally adding a base, preferably Ca (OH) _{2 in} order to increase the pH above 6, preferably above 7.5 and more particularly in a value between 8 and 10,

e) drying after one of steps b), c) or d).

It should be noted that this drying step e) is carried out by all the drying methods well known to those skilled in the art. In particular, the method according to the invention is characterized in that the calcium carbonate is a natural calcium carbonate and very preferably this natural calcium carbonate is chosen from a marble, a calcite, a chalk, a dolomite or their mixtures.

More particularly, the process according to the invention is characterized in that the moderately strong to strong H ₃ O ⁺ ion donor (s) are chosen from any moderately strong to strong acid, or any mixture of such acids, generating H 3θ ⁺ ions under the conditions of the treatment.

According to the invention, the quantity in mole of moderately strong to strong HsO * ion donors relative to the number of moles of CaCO ₃ is in total between 0.001 and 1, preferably between 0.1 and 0.5.

According to the invention, the quantity in moles of compounds of type R- relative to the number of moles of CaCO ₃ is in total between 0.0001 and 0.1, preferably between 0.002 and 0.01.

According to a preferred embodiment, step a) can be repeated several times and the order of addition of the medium strong and strong acids is arbitrary with the addition of the compounds of the RX type, before and / or during and / or after medium strong or strong acids.

According to a preferred embodiment, step b) can be repeated several times.

Similarly according to a preferred embodiment, the temperature during step a) of the treatment is between 5 ° C and 100 ° C, and preferably between 65 ° C and 80 ° C.

Also preferably, the duration of step a) of the treatment lasts from 0.01 hour to 10 hours and preferably from 0.2 hours to 6 hours.

The treatment process according to the invention is carried out in the aqueous phase at low, medium strong or high dry matter concentrations, but can also be used for mixtures of suspensions made up of these different concentrations. Preferably, the dry matter content is between 1% and 80% by weight.

In particular, a variant of step c) uses from 0.01% to 5.0% by dry weight of an anionic electrolyte chosen from homopolymers or copolymers in the non-neutralized, partially neutralized or completely neutralized, monomers with an ethylenic establishment and with a monocarboxylic function such as acrylic or methacrylic acid or else the hemiesters of diacids such as the C ₁ to C ₄ mono esters of maleic or itaconic acids, or their mixtures, or having a function dicarboxylic chosen from monomers with ethylenic unsaturation and di-carboxylic function such as crotonic, isocrotonic, cinnamic, itaconic, maleic acid, or alternatively carboxylic acid anhydrides, such as maleic anhydride or with sulfonic function chosen from monomers with ethylenic unsaturation and with sulfonic function such as acrylamido-methyl-propane-sulfonic acid, sodium methallylsulfonate, acid vinyl sulfonic and styrene sulfonic acid or alternatively with a phosphoric function chosen from ethylenically unsaturated monomers with a phosphoric function such as vinyl phosphoric acid, ethylene glycol methacrylate phosphate, propylene glycol methacrylate phosphate, ethylene glycol acrylate phosphate, propylene glycol acrylate phosphate and their ethoxylates or alternatively with a phosphonic function chosen from ethylenically unsaturated and phosphonic function monomers such as vinyl phosphonic acid, or mixtures thereof, or polyphosphates.

Likewise, a variant of step c) uses, in a particular way, from 0.01% to 5.0% by dry weight of a cationic electrolyte chosen from homopolymers or copolymers of cationic monomers or quaternary ammonium to ethylenic unsaturation such as [2- (methacryloyloxy) ethyl] trimethyl ammonium chloride or sulfate, [2- (acryloyloxy) ethyl] trimethyl ammonium chloride or sulfate, [3- (acrylamido) chloride or sulfate propyl] trimethyl ammonium, dimethyl diallyl ammonium chloride or sulfate, [3- (methacrylamido) propyl] trimethyl ammonium chloride or sulfate Similarly, a variant of step c) uses, in a particular way, from 0.01% to 5.0% by dry weight of a weakly anionic electrolyte chosen from the weakly ionic and water-soluble copolymer consisting of: a ) of at least one anionic monomer and having a carboxylic or dicarboxylic or phosphoric or phosphonic or sulfonic function or a mixture thereof, b) of at least one nonionic monomer, the nonionic monomer consisting of at least one monomer of formula ( I): (I)

in which: - m and p represent a number of alkylene oxide units less than or equal to 150, - n represents a number of ethylene oxide units less than or equal to 150, - q represents an integer at less equal to 1 and such that 5 ≤ (m + n + p) qs 150, and preferably such that 15 ≤ (m + n + p) q ≤ 120 - Ri 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 function, preferably belonging to the group of vinyls as well as to the group of acrylic, methacrylic, maleic, itaconic, crotonic, vinylphthalic esters as well as group of unsaturated urethanes such as for example acrylurethane, methacrylurethane, -α 'dimethyl-isopropenyl-benzylurethane, allylurethane, as well as to the group of substituted or unsubstituted allyl or vinyl ethers, or also to the group of amides or imides et hylenically unsaturated, - R 'represents hydrogen or a hydrocarbon radical having 1 to 40 carbon atoms, and preferably represents a hydrocarbon radical having 1 to 12 carbon atoms and very preferably a hydrocarbon radical having 1 to 4 carbon atoms, or a mixture of several monomers of formula (I), c) optionally of at least one monomer of the acrylamide or methacrylamide type or their derivatives such as N- [3- (dimethylamino) propyl] acrylamide or N- [3- (dimethylamino) propyl ] methacrylamide, and mixtures thereof, or alternatively at least one non-water-soluble monomer such as alkyl acrylates or methacrylates, unsaturated esters such as N- [2- (dimethylamino) ethyl methacrylate], or Facrylate N- [2- (dimethylamino) ethyl], vinyls such as vinyl acetate, vinylpyrrolidone, styrene, alphamethylstyrene and their derivatives, or at least one cationic monomer or quaternary ammonium such as chloride or sulfate e of [2- (methacryloyloxy) ethyl] trimethyl ammonium, [2- (acryloyloxy) ethyl] trimethyl ammonium chloride or sulfate, [3- (acrylamido) propyl] trimethyl ammonium chloride or sulfate, chloride or dimethyl diallyl ammonium sulphate, [3- (methacrylamido) propyl] trimethyl ammonium chloride or sulphate, or alternatively of at least one organofluorinated or organosililated monomer, or of the mixture of several of these monomers, d) optionally of at least one monomer having at least two ethylenic unsaturations called hereinafter in the crosslinking monomer application,

The dry mineral pigment containing a product formed in situ according to the invention is characterized in that it is obtained by the process according to the invention.

More particularly, the mineral pigment containing a product formed in situ according to the invention is characterized in that it has a specific surface of between 1 m / g and 200 m ² / g measured according to the BET method, preferably between 5 m ² / g and 80 m / g and very preferably between 20 m ² / g and 60 m ² / g as well as a diameter median, determined by a measurement with the Sedigraph ™ 5100, between 0.1 and 50 micrometers and preferably between 1 and 10 micrometers.

The BET specific surface is determined according to the ISO 9277 method.

In another variant, the aqueous suspension of the mineral pigment obtained according to steps c) to d) is characterized in that the mineral pigment has a specific surface of between 1 m ² / g and 200 m ² / g measured according to the BET method , preferably between 5 m ² / g and 80 m ² / g and very preferably between 10 m ² / g and 60 m ² / g as well as a median diameter, determined by a measurement with Sedigraph ™ 5100, between 0.1 and 50 micrometers, preferably between 1 and 10 micrometers, and in that the suspension has a dry matter content of between 1% and 80% and in that it contains from 0.05% to 5.0% by weight dry, relative to the dry weight of calcium carbonate, of at least one anionic electrolyte.

This anionic electrolyte is chosen from the anionic electrolytes previously mentioned.

Also more particularly, the aqueous suspension of the mineral pigment obtained according to steps c) to d) is characterized in that the mineral pigment has a specific surface of between 1 m ² / g and 200 m ² / g measured according to the method BET, preferably between 5 m / g and 80 m ² / g and very preferably between 20 m ² / g and 60 m ² / g as well as a median diameter, determined by a measurement with Sedigraph ™ 5100, between 0.1 and 50 micrometers, preferably between 1 and 10 micrometers, and in that the suspension has a dry matter content of between 1% and 80% and in that it contains from 0.1% to 5.0% by weight dry, relative to the dry weight of calcium carbonate, of at least one cationic electrolyte.

This cationic electrolyte is chosen from the cationic electrolytes previously mentioned.

In another particular variant, the aqueous suspension of the mineral pigment obtained according to steps c) to d) is characterized in that the mineral pigment has a specific surface of between 1 m ² / g and 200 m ² / g measured according to the method BET preferably between 5 m ² / g and 80 m ² / g and very preferably between 20 m ² / g and 60 m ² / g as well as a median diameter, determined by a measurement with Sedigraph ™ 5100, between 0.1 and 50 micrometers, preferably between 1 and 10 micrometers, and in that the suspension has a dry matter content of between 0.3% and 80%, and preferably in that it contains from 15% to 60% by dry weight , relative to the dry weight of calcium carbonate, of at least one weakly anionic electrolyte.

More preferably, the aqueous suspension according to the invention is characterized in that the mineral pigment has a specific surface of between 1 m / g and 80 m / g and very preferably between 10 m ² / g and 60 m ² / g as well a median diameter, determined by a Sedigraph ™ 5100 measurement, of between 0.1 and 50 micrometers, preferably between 1 and 10 micrometers,

Thus, does the invention also relate to the use of the suspension of the mineral pigment according to the invention as a rheology regulating filler allowing the viscosity to be controlled while retaining the solidity of the formulations of plastisol and rigid PVC type, and more particularly the use in the automobile industry in formulations of protective coating of automobile underbody.

It also relates to the use of the suspension of the mineral pigment according to the invention in the fields of paint and / or coatings and / or sealants.

The protective underbody coating according to the invention is characterized in that it contains the mineral filler according to the invention after drying in an amount ranging from 0.05% to 50%, preferably from 1% to 20%, more preferably from 5% to 15%.

The following examples illustrate the invention without, however, limiting its scope.

EXAMPLE 1

This example illustrates the prior art and relates to various processes for the preparation of pigment according to the prior art. Test # 1

This test illustrates a process for the preparation of a pigment according to the prior art for which 0.5 kg, calculated as dry pigment, of natural calcium carbonate of Norwegian marble type, with a particle size such as 65% by weight of the particles, is diluted. have a diameter of less than 1 μm, measured using the Sedigraph ™ 5100 from the company Micromeritics, in the form of an aqueous suspension of 75% of dry extract, dispersed with 0.6% of a polyacrylate of soda, up to obtaining an aqueous suspension with a dry matter concentration of 15% by weight, with distilled water, in the 10-liter container. Then the suspension thus formed is treated with 10% phosphoric acid in solution at 10% by weight, at 65 ° C with stirring for 20 minutes at 500 rpm. Then, the pH was adjusted, between 8 and 8.5 with a lime suspension at a concentration equal to 10% by dry weight before drying the suspension obtained using a Nara MSD 100 dryer.

The suspension of mineral pigment obtained before drying has a dry pigment concentration equal to 18.8% by mass, as well as a pH equal to 8.4. The particle size measured by Sedigraph ™ 5100 is such that 90% by weight of the particles have a diameter of less than 2 μm and 57% by weight of the particles have a diameter of less than 1 μm.

After drying, the product has a BET specific surface, measured according to the BET method of standard ISO 9277, equal to 30.7 m ² / g.

Trial # 2

This test illustrates a process for the preparation of a pigment according to the prior art for which 0.758 kg, calculated as dry pigment, of natural calcium carbonate of French chalk type, with a particle size such that 65% by weight of the particles have a dilution, has a diameter less than 1 μm, measured using the Sedigraph ™ 5100 from the company Micromeritics, in the form of an aqueous suspension of 75% of dry extract, dispersed with 0.6% of a polyacrylate of soda, up to 1 'obtaining an aqueous suspension with a dry matter concentration of 10% by weight, with distilled water, in the 10 liter ESCO reactor. The suspension thus formed is then treated with 20% phosphoric acid in solution at 20% by weight, at 65 ° C. with stirring for 60 minutes. Then, the pH was adjusted, between 8 and 8.5 with a lime suspension at a concentration equal to 10% by dry weight before drying the suspension obtained using a Nara MSD 100 dryer.

The suspension of mineral pigment obtained before drying has a dry pigment concentration equal to 18.8% by mass, as well as a pH equal to 8.4.

The particle size measured by Sedigraph ™ 5100 is such that 94.4% by weight of the particles have a diameter of less than 2 μm and 68.2% by weight of the particles have a diameter of less than 1 μm.

After drying, the product has a BET specific surface, measured according to the BET method of standard ISO 9277, equal to 31.1 m ² / g.

Test # 3

The suspension of mineral pigment obtained before drying has a dry pigment concentration equal to 18.8% by mass, as well as a pH equal to 8.4. The particle size measured by Sedigraph ™ 5100 is such that 90% by weight of the particles have a diameter of less than 2 μm and 57% by weight of the particles have a diameter of less than 1 μm. After drying, the product has a BET specific surface, measured according to the BET method of standard ISO 9277, equal to 30.7 m ² / g.

The product is then treated with 3% stearic acid. The treatment was carried out at 120 ° C for ten minutes in an MTI laboratory mixer; the rotation speed was 1500 rpm.

EXAMPLE 2 This example illustrates the invention and relates to the process for manufacturing a dry mineral pigment containing a product formed in situ by the multiple reaction between a natural calcium carbonate and the reaction product (s) of said carbonate with one or more moderately strong to strong H ₃ θ ⁺ ion donors and the reaction product (s) of said carbonate with CO ₂ gas formed in situ and / or coming from an external supply and one or more compounds of formula RX as well as the pigment mineral obtained by the process.

Test No. 4 This test illustrates the invention and relates to a process for obtaining the pigment according to the invention in which the treatment with 2% of a mixture of palmitic acid and stearic acid (in a ratio of approximately 1/1 by weight) takes place during the reaction of calcium carbonate with phosphoric acid.

To do this, dilute 0.746 kg, calculated as dry pigment, of natural calcium carbonate of the French chalk type, with a particle size such that 65% by weight of the particles have a diameter of less than 1 μm, measured using the Sedigraph ™ 5100 of Micromeritics, in the form of an aqueous suspension of 78% of dry extract, dispersed with 0.5% of a sodium hydroxide polyacrylate, until an aqueous suspension of a dry matter concentration is obtained of 10% by weight, with distilled water, in a 10 liter ESCO reactor. The suspension thus formed is then treated with 25% phosphoric acid in solution at 20% by weight, at 60 ° C. with stirring for 60 minutes at 500 revolutions per minute. Then, 2% of fatty acid of the palmitic acid / stearic acid mixture type in a ratio 1/1 by weight is added in powder then mixed for 30 minutes before drying the suspension obtained using a Nara MSD-100 dryer.

The suspension of mineral pigment obtained before drying has a dry pigment concentration equal to 9.5% by mass, as well as a pH equal to 6.4.

The particle size measured by Sedigraph ™ 5100 is such that 90.9% of the particles have a diameter of less than 2 μm and 66.8% of the particles have a diameter of less than 1 μm.

After drying, the product has a BET specific surface area, measured according to the BET method of standard ISO 9277, equal to 33.4 m ² / g and a median diameter, determined by measurement with Sedigraph ™ 5100, equal to 0.72 micrometer as well as a moisture content equal to 1.32% determined according to the method previously described.

Test # 5

This test illustrates the invention and relates to a process for obtaining the pigment according to the invention in which the treatment with 2% stearic acid takes place before the reaction of calcium carbonate with phosphoric acid.

To do this, dilute 0.750 kg, calculated as dry pigment, of natural calcium carbonate of the French chalk type, with a particle size such that 65% by weight of the particles have a diameter of less than 1 μm, measured using the Sedigraph ™ 5100 of Micromeritics, in the form of an aqueous suspension of 78% of dry extract, dispersed with 0.5% of a sodium hydroxide polyacrylate, until an aqueous suspension of a dry matter concentration is obtained 10% by weight, with distilled water, in the 10 liter container. Then 2% of pure stearic acid from Fluka is added and the mixture is heated to 70 ° C. and mixed for 15 minutes, before treating the suspension thus formed with 25% phosphoric acid in solution at 20% by weight, to 60 ° C with stirring for 60 minutes at 500 revolutions per minute. It is left to react for 30 minutes before drying the suspension obtained using a Nara MSD-100 dryer. The suspension of mineral pigment obtained before drying has a dry pigment concentration equal to 9.4% by mass, as well as a pH equal to 6.4. The particle size measured by Sedigraph ™ 5100 is such that 91.7% of the particles have a diameter of less than 2 μm and 66.9% of the particles have a diameter of less than 1 μm.

After drying, the product has a BET specific surface, measured according to the BET method of standard ISO 9277, equal to 34.5 m ² / g and a median diameter, determined by measurement with Sedigraph ™ 5100, equal to 0.73 micrometer .

Test # 6

This test illustrates the invention and relates to a process for obtaining the pigment according to the invention in which the treatment with 3% stearic acid takes place before the reaction of calcium carbonate with phosphoric acid.

To do this, dilute 0.750 kg, calculated as dry pigment, of natural calcium carbonate of the French chalk type, with a particle size such that 65% by weight of the particles have a diameter of less than 1 μm, measured using the Sedigraph ™ 5100 of Micromeritics, in the form of an aqueous suspension of 78% of dry extract, dispersed with 0.5% of a sodium hydroxide polyacrylate, until an aqueous suspension of a dry matter concentration is obtained 10% by weight, with distilled water, in the 10 liter container. Then 3% of pure stearic acid from Fluka is added and the mixture is heated to 70 ° C. and mixed for 15 minutes, before treating, leaving the suspension thus formed to 60 ° C. to cool down with 25% phosphoric acid in solution. at 20% by weight, at 60 ° C. with stirring for 60 minutes at 500 revolutions per minute. It is left to react for 30 minutes before drying the suspension obtained using a Nara MSD-100 dryer.

The particle size measured by Sedigraph ™ 5100 is such that 93.0% of the particles have a diameter of less than 2 μm and 73.1% of the particles have a diameter of less than 1 μm.

After drying, the product has a BET specific surface area, measured according to the BET method of standard ISO 9277, equal to 28.8 m ² / g and a median diameter, determined by measurement with Sedigraph ™ 5100, equal to 0.57 micrometer . Trial # 7

This test illustrates the invention and relates to a process for obtaining the pigment according to the invention in which the treatment with 5% stearic acid takes place before the reaction of calcium carbonate with phosphoric acid.

To do this, dilute 0.750 kg, calculated as dry pigment, of natural calcium carbonate of the French chalk type, with a particle size such that 65% by weight of the particles have a diameter of less than 1 μm, measured using the Sedigraph ™ 5100 of Micromeritics, in the form of an aqueous suspension of 78% dry extract, dispersed with 0.5% of a sodium hydroxide polyacrylate, until an aqueous suspension with a dry matter concentration is obtained 10% by weight, with distilled water, in the 10 liter container. Then 5% of pure stearic acid from Fluka is added and the mixture is heated to 70 ° C. and mixed for 15 minutes, before treating, leaving the suspension thus formed to 60 ° C. to cool with 25% phosphoric acid in solution. at 20% by weight, at 60 ° C. with stirring for 60 minutes at 500 revolutions per minute. It is left to react for 30 minutes before drying the suspension obtained using a Nara MSD-100 dryer.

The suspension of mineral pigment obtained before drying has a dry pigment concentration equal to 9.6% by mass, as well as a pH equal to 6.4.

The particle size measured by Sedigraph ™ 5100 is such that 85.3% of the particles have a diameter of less than 2 μm and 61.9% of the particles have a diameter of less than 1 μm.

After drying, the product has a BET specific surface area, measured according to the BET method of standard ISO 9277, equal to 26.5 m ² / g and a median diameter, determined by measurement with Sedigraph ™ 5100, equal to 0.75 micrometer .

Trial # 8

This test illustrates the invention and relates to a process for obtaining the pigment according to the invention in which the treatment with 2% stearic acid takes place during the reaction of calcium carbonate with phosphoric acid. To do this, dilute 200 kg, calculated as dry pigment, of natural calcium carbonate of the French chalk type, with a particle size such that 65% by weight of the particles have a diameter of less than 1 μm, measured using the Sedigraph 5100 of the Micromeritics, in the form of an aqueous suspension of 78% dry extract, dispersed with 0.5% of a polyacrylate of soda, until an aqueous suspension of a dry matter concentration of 10% by weight, with distilled water, in a 3000 liter tank. The suspension thus formed is then treated with 36% phosphoric acid in solution at 10% by weight, at 70 ° C. with stirring for 120 minutes at 500 revolutions per minute. Then, 2% of stearic acid (of technical quality corresponding to a C16-C18 mixture) powder is added and mixed for 30 minutes before drying the suspension obtained using a Nara MSD-100 dryer.

The suspension of mineral pigment obtained before drying has a dry pigment concentration equal to 9.2% by mass, as well as a pH equal to 6.8.

The particle size measured by Sedigraph ™ 5100 is such that 74.2% of the particles have a diameter of less than 2 μm and 37.5% of the particles have a diameter of less than 1 μm.

After drying, the product has a BET specific surface, measured according to the BET method of standard ISO 9277, equal to 31.4 m ² / g and a median diameter, determined by measurement with Sedigraph ™ 5100, equal to 1.31 micrometers as well as a moisture content equal to 1.40% determined according to the method previously described.

Test # 9

This test illustrates the invention and relates to a process for obtaining the pigment according to the invention in which the treatment with 2% of stearic acid takes place during the reaction of calcium carbonate with phosphoric acid, but before the dosage of said acid.

To do this, dilute 9 kg, calculated as dry pigment, of natural calcium carbonate of the French chalk type, with a particle size such that 65% by weight of the particles have a diameter of less than 1 μm, measured using the Sedigraph ™ 5100 of Micromeritics, in the form of an aqueous suspension of 78% dry extract, dispersed with 0.5% of a sodium hydroxide polyacrylate, until an aqueous suspension with a dry matter concentration of 10% by weight is obtained, with distilled water, in a fluidized bed of the Lodige type. 135 liters. Then the suspension thus formed is treated with 13% phosphoric acid in solution at 10% by weight, at 70 ° C. with stirring for 24 minutes at 500 rpm. Then, 2% of stearic acid (of technical quality corresponding to a C16-C18 mixture) in powder is added and mixed for 30 minutes before drying the suspension obtained using a Nara MSD-100 dryer.

The suspension of mineral pigment obtained before drying has a dry pigment concentration equal to 8.2% by mass, as well as a pH equal to 7.1.

The particle size measured by Sedigraph ™ 5100 is such that 87.6% of the particles have a diameter of less than 2 μm and 59.3% of the particles have a diameter of less than 1 μm.

After drying, the product has a BET specific surface area, measured according to the BET method of standard ISO 9277, equal to 21.7 m ² / g and a median diameter, determined by measurement with Sedigraph ™ 5100, equal to 0.83 micrometer .

Test # 10

This test illustrates the invention and relates to a process for obtaining the pigment according to the invention in which the treatment with 1% of stearic acid takes place before the reaction of calcium carbonate with phosphoric acid.

To do this, dilute 0.750 kg, calculated as dry pigment, of natural calcium carbonate of the French chalk type, with a particle size such that 65% by weight of the particles have a diameter of less than 1 μm, measured using the Sedigraph ™ 5100 of Micromeritics, in the form of an aqueous suspension of 75% dry extract, dispersed with 0.45% of a polyacrylate of soda, until an aqueous suspension with a dry matter concentration is obtained of 10% by weight, with distilled water, in the 10 liter ESCO reactor. Then 1% of stearic acid (of technical quality corresponding to a palmitic / stearic type mixture, C16-C18) is added and the mixture is mixed for 15 minutes. The suspension thus formed is then treated with 10% phosphoric acid in solution at 20% by weight, at 60 ° C. with stirring for 60 minutes. It is left to react for 30 minutes before drying the suspension obtained using a Nara MSD-100 dryer.

The suspension of mineral pigment obtained before drying has a dry pigment concentration equal to 9.6% by mass, as well as a pH equal to 6.6.

The particle size measured by Sedigraph ™ 5100 is such that 94.8% of the particles have a diameter of less than 2 μm and 67.0% of the particles have a diameter of less than 1 μm.

After drying, the product has a BET specific surface area, measured according to the BET method of standard ISO 9277, equal to 18.9 m ² / g and a median diameter, determined by measurement with Sedigraph ™ 5100, equal to 0.73 micrometer .

Trial # 11

This test illustrates the invention and relates to a process for obtaining the pigment according to the invention in which the treatment with 0.5% stearic acid takes place before the reaction of calcium carbonate with phosphoric acid.

To do this, dilute 0.750 kg, calculated as dry pigment, of natural calcium carbonate of the French chalk type, with a particle size such that 65% by weight of the particles have a diameter of less than 1 μm, measured using the Sedigraph ™ 5100 of Micromeritics, in the form of an aqueous suspension of 75% dry extract, dispersed with 0.5% of a sodium hydroxide polyacrylate, until an aqueous suspension with a dry matter concentration is obtained of 10% by weight, with distilled water, in the 10 liter ESCO reactor. Then 0.5% of stearic acid (of technical quality corresponding to a C16-C18 mixture) is added and the mixture is mixed for 15 minutes. The suspension thus formed is then treated with 20% phosphoric acid in solution at 20% by weight, at 60 ° C. with stirring for 60 minutes. It is left to react for 30 minutes before drying the suspension obtained using a Nara MSD-100 dryer.

The suspension of mineral pigment obtained before drying has a dry pigment concentration equal to 9.3% by mass, as well as a pH equal to 6.6. The particle size measured by Sedigraph ™ 5100 is such that 94.8% of the particles have a diameter of less than 2 μm and 68.2% of the particles have a diameter of less than 1 μm.

After drying, the product has a BET specific surface area, measured according to the BET method of standard ISO 9277, equal to 32.1 m ² / g and a median diameter, determined by measurement with Sedigraph ™ 5100, equal to 0.74 micrometer .

Test No. 12 This test illustrates the invention and relates to a process for obtaining the pigment according to the invention in which the treatment with 1% stearic acid takes place before the reaction of the calcium carbonate of marble type with the acid. phosphoric.

To do this, dilute 0.750 kg, calculated as dry pigment, of natural calcium carbonate of Norwegian marble type, with a particle size such that 65% by weight of the particles have a diameter of less than 1 μm, measured using the Sedigraph ™ 5100 of Micromeritics, in the form of an aqueous suspension of 78% of dry extract, dispersed with 0.62% of a polyacrylate of soda, until an aqueous suspension of a dry matter concentration is obtained of 10% by weight, with distilled water, in the 10 liter ESCO reactor. Then add 1% stearic acid

(technical quality corresponding to a C16-C18 mixture) and mixing for 15 minutes. The suspension thus formed is then treated with 20% phosphoric acid in solution at 20% by weight, at 60 ° C. with stirring for 60 minutes. It is left to react for 30 minutes before drying the suspension obtained using a Nara MSD-100 dryer.

The suspension of mineral pigment obtained before drying has a dry pigment concentration equal to 9.5% by mass, as well as a pH equal to 6.6.

The particle size measured by Sedigraph 5100 is such that 89.6% of the particles have a diameter of less than 2 μm and 64.5% of the particles have a diameter of less than 1 μm.

After drying, the product has a BET specific surface, measured according to the BET method of standard ISO 9277, equal to 40.2 m ² / g and a median diameter, determined by measurement with Sedigraph ™ 5100, equal to 0.75 micrometers as well as a moisture content equal to 1.41% determined according to the method previously described.

Test No. 13 This test illustrates the invention and relates to a process for obtaining the pigment according to the invention in which the treatment with stearic acid took place before the reaction of calcium carbonate with phosphoric acid, since l the test uses Winnofil SPT from the company Solvay, which is a precipitated calcium carbonate treated with a fatty acid, the particle size of which measured by Sedigraph ™ 5100 is such that 89.6% of the particles have a diameter of less than 2 μm and 64, 5% of the particles have a diameter less than 1 μm and whose BET specific surface is equal to 17.8 m ² / g (measured according to the BET method of standard ISO 9277).

To do this, dilute 0.750 kg Winnofil SPT, calculated as dry pigment, in the form of an aqueous suspension of 78% dry extract, dispersed with 0.5% of a polyacrylate of soda, until obtaining of an aqueous suspension with a dry matter concentration of 10% by weight, with distilled water, in the reactor. ESCO of 10 liters. The suspension thus formed is then treated with 20% phosphoric acid in solution at 20% by weight, at 60 ° C. with stirring for 60 minutes before drying the suspension obtained using a Nara MSD-100 dryer.

The suspension of mineral pigment obtained before drying has a dry pigment concentration equal to 9.3% by mass, as well as a pH equal to 6.4.

The particle size measured by Sedigraph ™ 5100 is such that 62.9% of the particles have a diameter of less than 2 μm and 51.4% of the particles have a diameter of less than 1 μm.

After drying, the product has a BET specific surface, measured according to the BET method of standard ISO 9277, equal to 52.1 m ² / g and a median diameter, determined by measurement with Sedigraph ™ 5100, equal to 0.90 micrometer. .

Trial # 14

This test illustrates the invention and relates to a process for obtaining the pigment according to the invention in which the treatment with stearic acid took place before the reaction. calcium carbonate with phosphoric acid, since the test uses Socal 322 from the company Solvay which is a precipitated calcium carbonate treated with a fatty acid whose particle size measured by Sedigraph ™ 5100 is such as 90.0 % of particles with a diameter less than 2μm and 86.0% of particles with a diameter less than lμm and whose BET specific surface is equal to 17.5 m ² / g (measured according to the BET method of ISO 9277 standard) .

To do this, dilute 0.750 kg Socal 322, calculated as dry pigment in the form of an aqueous suspension of 78% of dry extract, dispersed with 0.5% of a polyacrylate of soda, until obtaining '' an aqueous suspension with a dry matter concentration of 10% by weight, with distilled water, in the 10 liter ESCO reactor. The suspension thus formed is then treated with 20% phosphoric acid in solution at 20% by weight, at 60 ° C. with stirring for 60 minutes before drying the suspension obtained using a Nara MSD-100 dryer.

The suspension of mineral pigment obtained before drying has a dry pigment concentration equal to 9.3% by mass, as well as a pH equal to 6.3.

The particle size measured by Sedigraph ™ 5100 is such that 87.9% of the particles have a diameter of less than 2 μm and 77.9% of the particles have a diameter of less than 1 μm.

After drying, the product has a BET specific surface area, measured according to the BET method of standard ISO 9277, equal to 48.4 m ² / g and a median diameter, determined by measurement with Sedigraph ™ 5100, equal to 0.30 micrometer .

Trial # 15

This test illustrates the invention and relates to a process for obtaining the pigment according to the invention in which the treatment with 2% of a mixture of fatty acid and fatty alcohol takes place before the reaction of the calcium carbonate of the type chalk with phosphoric acid.

To do this, dilute 0.750 kg, calculated as dry pigment, of calcium carbonate natural French chalk type, with a particle size such that 65% by weight of the particles have a diameter of less than 1 μm, measured using the Sedigraph ™ 5100 from the company Micromeritics, in the form of an aqueous suspension of 10% of dry extract , dispersed with 0.5% of a polyacrylate of soda, until an aqueous suspension of a dry matter concentration of 10% by weight is obtained, with distilled water, in the ESCO reactor of 10 liters. Then add 0.2% fatty acid based on vegetable oil sold by the company Hobum Oleochemicals (Hamburg-Germany) under the name "isomergine" and 1.8% stearilic alcohol and mix for 15 minutes. The suspension thus formed is then treated with 25% phosphoric acid in solution at 30% by weight, at 60 ° C. with stirring for 60 minutes. It is left to react for 30 minutes before drying the suspension obtained using a Nara MSD-100 dryer.

The suspension of mineral pigment obtained before drying has a dry pigment concentration equal to 9.8% by mass, as well as a pH equal to 6.0.

The particle size measured by Sedigraph ™ 5100 is such that 74.1% of the particles have a diameter of less than 2 μm and 38.0% of the particles have a diameter of less than 1 μm.

After drying, the product has a BET specific surface area, measured according to the BET method of standard ISO 9277, equal to 24.0 m ² / g and a median diameter, determined by measurement with Sedigraph ™ 5100, equal to 1.29 micrometers .

Trial # 16

This test illustrates the invention and relates to a process for obtaining the pigment according to the invention in which the treatment with 2% of a fatty acid and fatty alcohol mixture takes place before the reaction of the calcium carbonate of chalk type with phosphoric acid.

To do this, dilute 0.750 kg, calculated as dry pigment, of natural calcium carbonate of the French chalk type, with a particle size such that 32% by weight of the particles have a diameter of less than 1 μm, measured using the Sedigraph ™ 5100 of the Micromeritics, in the form of an aqueous suspension of 65% dry extract, dispersed with 0.13% of a polyacrylate of soda, until an aqueous suspension with a dry matter concentration of 10% by weight is obtained, by distilled water, in the ESCO reactor of 10 liters. Then adding 0.5% fatty acid based on vegetable oil sold by the company Hobum Oleochemicals (Hamburg-Germany) under the name "isomergine" and 1.5% dodecyl alcohol and mixture for 15 minutes, then the suspension thus formed is treated with 25% phosphoric acid in solution at 30% by weight, at 60 ° C. with stirring for 60 minutes. It is left to react for 30 minutes before drying the suspension obtained using a Nara MSD-100 dryer.

The particle size measured by Sedigraph ™ 5100 is such that 57.3% of the particles have a diameter of less than 2 μm and 25.3% of the particles have a diameter of less than 1 μm.

After drying, the product has a BET specific surface area, measured according to the BET method of standard ISO 9277, equal to 31.0 m ² / g and a median diameter, determined by measurement with Sedigraph ™ 5100, equal to 1.79 micrometers .

Trial # 17

This test illustrates the invention and relates to a process for obtaining the pigment according to the invention in which the treatment with 2% fatty alcohol takes place before the reaction of the calcium carbonate of chalk type with phosphoric acid.

To do this, dilute 0.750 kg, calculated as dry pigment, of natural calcium carbonate of the French chalk type, with a particle size such that 32% by weight of the particles have a diameter of less than 1 μm, measured using the Sedigraph ™ 5100 of Micromeritics, in the form of an aqueous suspension of 65% dry extract, dispersed with 0.13% of a sodium hydroxide polyacrylate, until an aqueous suspension with a dry matter concentration is obtained of 10% by weight, with distilled water, in the 10 liter ESCO reactor. Then 2.0% stearilic alcohol is added and mixed for 15 minutes, then the suspension thus formed is treated with 25% phosphoric acid in solution at 30% by weight, at 60 ° C. with stirring. for 60 minutes. It is left to react for 30 minutes before drying the suspension obtained using a Nara MSD-100 dryer.

The suspension of mineral pigment obtained before drying has a dry pigment concentration equal to 9.8% by mass, as well as a pH equal to 6.1.

The particle size measured by Sedigraph ™ 5100 is such that 74.8% of the particles have a diameter of less than 2 μm and 36.8% of the particles have a diameter of less than 1 μm.

After drying, the product has a BET specific surface area, measured according to the BET method of standard ISO 9277, equal to 23.9 m ² / g and a median diameter, determined by measurement with Sedigraph ™ 5100, equal to 1.30 micrometers .

Trial # 18

This test illustrates the invention and relates to a process for obtaining the pigment according to the invention in which the treatment with 2% stearic acid is carried out continuously during the manufacture of the precipitated calcium carbonate and the treatment with the donor H ₃ θ ⁺ medium strong to strong.

To do this, the process is carried out by preparing 400g Ca (OH) ₂ in 7600 g distilled water in the 10 liter ESCO reactor, then adding CO ₂ in the form of gas at 30 ° C to a pH of 6 5.

After having allowed to react for 30 minutes, the suspension is heated in the reactor to 60 ° C., then 2.0% of stearic acid is added and mixed for 15 minutes, then the suspension thus formed is treated with 20% of phosphoric acid in solution at 30% by weight, with stirring for 60 minutes. It is left to react for 30 minutes before drying the suspension obtained using a Nara MSD-100 dryer.

The suspension of mineral pigment obtained before drying has a dry pigment concentration equal to 5.7% by mass, as well as a pH equal to 6.4. The particle size measured by Sedigraph ™ 5100 is such that 41.4% by weight of the particles have a diameter of less than 2 μm and 18.1% by weight of the particles has a diameter of less than 1 μm.

After drying, the product has a BET specific surface area, measured according to the BET method of standard ISO 9277, equal to 37.9 m ² / g and a median diameter, determined by measurement with Sedigraph ™ 5100, equal to 2.29 micrometers .

Trial # 19

This test illustrates the invention and relates to a process for obtaining the pigment according to the invention in which the treatment with 1% fatty acid takes place before the reaction of the calcium carbonate of chalk type with phosphoric acid.

To do this, dilute 0.750 kg, calculated as dry pigment, of natural calcium carbonate of the French chalk type, with a particle size such that 50% by weight of the particles have a diameter of less than 1 μm, measured using the Sedigraph 5100 of the Micromeritics, in the form of an aqueous suspension of 75% dry extract, dispersed with 0.6% of a polyacrylate of soda, until an aqueous suspension with a dry matter concentration of 10% by weight, with distilled water, in the 10 liter ESCO reactor. Then 1.0% stearic acid is added and mixed for 15 minutes. The suspension thus formed is then treated with 25% phosphoric acid in solution at 20% by weight, at 60 ° C. with stirring for 60 minutes. It is left to react for 30 minutes before drying the suspension obtained using a Nara MSD-100 dryer.

The suspension of mineral pigment obtained before drying has a dry pigment concentration equal to 9.3% by mass, as well as a pH equal to 6.5.

The particle size measured by Sedigraph ™ 5100 is such that 94.9% by weight of the particles have a diameter of less than 2 μm and 67.0% by weight of the particles has a diameter of less than 1 μm. After drying, the product has a BET specific surface area, measured according to the BET method of standard ISO 9277, equal to 34.9 m ² / g and a median diameter, determined by measurement with Sedigraph ™ 5100, equal to 0.76 micrometer .

Trial # 20

This test illustrates the invention and relates to a process for obtaining the pigment according to the invention in which the treatment with 1% fatty acid takes place after the reaction of the calcium carbonate of chalk type with phosphoric acid.

To do this, dilute 0.750 kg, calculated as dry pigment, of natural calcium carbonate of the French chalk type, with a particle size such that 50% by weight of the particles have a diameter of less than 1 μm, measured using the Sedigraph 5100 of the Micromeritics, in the form of an aqueous suspension of 75% of dry extract, dispersed with 0.6% of a polyacrylate of soda, until an aqueous suspension of a dry matter concentration of 10% by weight, with distilled water, in the 10 liter ESCO reactor. The suspension thus formed is then treated with 20% phosphoric acid in solution at 20% by weight, at 60 ° C. with stirring for 60 minutes at 500 revolutions per minute. Then, 1% powdered stearic acid is added and mixed for 30 minutes before drying the suspension obtained using a Nara MSD-100 dryer.

The suspension of mineral pigment obtained before drying has a dry pigment concentration equal to 9.5% by mass, as well as a pH equal to 6.5.

The particle size measured by Sedigraph ™ 5100 is such that 94.1% by weight of the particles have a diameter of less than 2 μm and 66.2% by weight of the particles has a diameter of less than 1 μm.

After drying, the product has a BET specific surface, measured according to the BET method of standard ISO 9277, equal to 30.4 m ² / g and a median diameter, determined by measurement with Sedigraph ™ 5100, equal to 0.77 micrometer . Trial # 21

This test illustrates the invention and relates to a process for obtaining the pigment according to the invention in which the treatment with 2% dodecylbenzene sulfonic acid takes place after the reaction of calcium carbonate of chalk type with phosphoric acid.

To do this, dilute 0.750 kg, calculated as dry pigment, of natural calcium carbonate of the French chalk type, with a particle size such that 50% by weight of the particles have a diameter of less than 1 μm, measured using the Sedigraph ™ 5100 of Micromeritics, in the form of an aqueous suspension of 75% of dry extract, dispersed with 0.6% of a polyacrylate of soda, until an aqueous suspension of a dry matter concentration is obtained of 10% by weight, with distilled water, in the 10 liter ESCO reactor. Then the suspension thus formed is treated with 25% phosphoric acid in solution at 30% by weight, at 60 ° C with stirring for 60 minutes at 500 rpm. Then, 2% powdered dodecylbenzene sulfonic acid is added and mixed for 30 minutes before drying the suspension obtained using a Nara MSD-100 dryer.

The suspension of mineral pigment obtained before drying has a dry pigment concentration equal to 10.0% by mass, as well as a pH equal to 6.6.

The particle size measured by Sedigraph ™ 5100 is such that 93.9% by weight of the particles have a diameter of less than 2 μm and 59.6% by weight of the particles has a diameter of less than 1 μm.

After drying, the product has a BET specific surface area, measured according to the BET method of ISO standard 9277, equal to 35.4 m ² / g and a median diameter, determined by measurement with Sedigraph ™ 5100, equal to 0.87 micrometer .

Trial # 22

This test illustrates the invention and relates to a process for obtaining the pigment according to the invention in which the treatment with 2% of lauric acid takes place after the reaction of calcium carbonate of the marble type with phosphoric acid. To do this, dilute 0.750 kg, calculated as dry pigment, of natural calcium carbonate of Norwegian marble type, with a particle size such that 65% by weight of the particles have a diameter of less than 1 μm, measured using the Sedigraph ™ 5100 of Micromeritics, in the form of an aqueous suspension of 78% of dry extract, dispersed with 0.62% of a polyacrylate of soda, until an aqueous suspension of a dry matter concentration is obtained of 10% by weight, with distilled water, in the 10 liter ESCO reactor. The suspension thus formed is then treated with 20% phosphoric acid in solution at 30% by weight, at 60 ° C. with stirring for 60 minutes. Then, 2% laurylic acid is added and mixed for 30 minutes before drying the suspension obtained using a Nara MSD-100 dryer.

The suspension of mineral pigment obtained before drying has a dry pigment concentration equal to 9.8% by mass, as well as a pH equal to 6.8.

The particle size measured by Sedigraph ™ 5100 is such that 88.8% by weight of the particles have a diameter of less than 2 μm and 64.8% by weight of the particles has a diameter of less than 1 μm.

After drying, the product has a BET specific surface area, measured according to the BET method of standard ISO 9277, equal to 35.0 m ² / g and a median diameter, determined by measurement with Sedigraph ™ 5100, equal to 0.65 micrometer as well as a moisture content equal to 1.26% determined according to the method previously described.

EXAMPLE 3

This example relates to the use of the pigments according to the invention as rheology regulator for the preparation of a plastisol based on polyvinyl chloride (PVC).

The loaded plastisol is produced by mixing the plastisol based on uncharged PVC and the calcium carbonate or the mineral pigment to be tested in a container 7 cm in diameter and homogenizing with a spatula. The total weight of the mixture being 200 g. The mixture is then dispersed for two minutes using a “Pendraulik” ™ LD50 laboratory mixing apparatus, the diameter of the dispersing disc being 5 cm, the speed of rotation of the disc. being 2700 rpm (manual adjustment in position three).

Once the dispersion has been completed, the viscosity measurement is carried out using the “Rheomat 120” ™ apparatus, measuring device according to DIN 125 standard, at 20 ° C.

The pour point is determined using the Bingham model, well known to those skilled in the art, after aging for 24 hours and 30 days at a temperature of 23 ° C.

In all the tests of the example, the aim of which is to obtain a lightened automobile bodywork with a rheology of constant formulation, the formulation of plastisol based on PVC (polyvinyl chloride) has the following formulation 1:

- 90% by weight of the PVC resin plastisol from Henkel-Teroson, - 10% by weight of the mineral filler to be tested.

Trial # 23

This test illustrates the prior art and uses the precipitated calcium carbonate sold by the company Solvay under the name Winnofil SPT ™. This test serves as a reference.

Trial # 24

This test illustrates the prior art and uses a calcium carbonate from test n ° 1. The pour point after 30 days of aging at 23 ° C in formulation 1 is 63.6% higher than that of test no. 23.

Trial # 25

This test illustrates the prior art and uses a calcium carbonate from test No. 3 treated with 3% stearic acid after drying. The treatment was carried out for ten minutes in an MTI laboratory mixer at 120 ° C; the rotation speed was 1500 rpm. The pour point after 30 days of aging at 23 ° C in formulation 1 is 49.0% lower than that of test No. 23. Treatment after drying does not work.

Trial # 26

This test illustrates the prior art and uses a precipitated calcium carbonate sold by the company Solvay under the name Socal ™ 322. The pour point after 30 days of aging at 23 ° C in formulation 1 is 16.8 % higher than that of test n ° 23.

Trial # 27

This test illustrates the prior art and uses a calcium carbonate sold by the company Omya under the name Hydrocarb ™ 120T. The pour point after 30 days of aging at 23 ° C in formulation 1 is 7.7% lower than that of test No. 23.

Trial # 28

This test illustrates the prior art and uses a calcium carbonate sold by the company Omya under the name Omyabond ™ 302. The pour point after 30 days of aging at 23 ° C in formulation 1 is 1.4% higher than that of test n ° 23.

Test No. 29 This test illustrates the prior art and uses a calcium carbonate sold by the company Omya under the name Omyabond ™ 301. The pour point after 30 days of aging at 23 ° C. in formulation 1 is 24.5% lower than that of test n ° 23.

Trial # 30

This test illustrates the invention and uses the calcium carbonate of test No. 4. The pour point after 30 days of aging at 23 ° C. in formulation 1 is 53.1% higher than that of test n ° 23. Test n ° 31 This test illustrates the invention and uses the calcium carbonate of test n ° 5. The pour point after 30 days of aging at 23 ° C in formulation 1 is 102.1% more higher than that of test n ° 23.

Test No. 32 This test illustrates the invention and uses the calcium carbonate from test No. 6. The pour point after 30 days of aging at 23 ° C in formulation 1 is 36.4% higher than that of test No. 23.

Test No. 33 This test illustrates the invention and uses the calcium carbonate from test No. 7. The pour point after 30 days of aging at 23 ° C in formulation 1 is 4.2% higher than that of test No. 23.

Test No. 34 This test illustrates the invention and uses the calcium carbonate from test No. 8. The pour point after 30 days of aging at 23 ° C. in formulation 1 is 86.7% more higher than that of test n ° 23.

All the results of the previous tests are reported in the following table 1.

TABLE 1

Reading Table 1 shows that the good rheology results obtained with the products according to the invention. EXAMPLE 4

This example relates to the use of the pigments according to the invention as rheology regulator for the preparation of a plastisol based on polyvinyl chloride (PVC) and of formulation distinct from that of Example 3.

To do this, formulation 2 is produced with the same operating mode and the same apparatus as in Example 3.

This formulation 2, PVC-based plastisol, is composed of:

- 24% by weight of a Vestolit E 7031 ™ PVC resin (Vestolit, Germany), - 6.0% by weight of a Vestolit C 65 ™ PVC resin (Vestolit, Germany), - 47.0% by weight of '' a DINP plasticizer (Diisononylphthalate), - 2.0% by weight of a Super Weisskalk 40 desiccant (Omya AG, Switzerland), - 1.0% by weight of a EURETEK 505 ™ adhesion promoter (Ciba SC, Switzerland), - 20.0% by weight of mineral pigment to be tested.

For each of the tests of the example, the viscosity and pour point measurements are carried out according to the same operating mode and the same equipment as that of the previous example.

Trial # 35

Essay # 36

This test illustrates the prior art and uses a precipitated calcium carbonate marketed by the company Solvay under the name Socal ™ 322. The pour point after 30 days of aging at 23 ° C in formulation 2 is 108.3% higher than that of test No. 35.

Essay # 37

This test illustrates the prior art and uses a calcium carbonate marketed by the company Omya under the name Omyabond ™ 302. The pour point after 30 days of aging at 23 ° C in formulation 2 is 102.8% higher than that of test n ° 35.

Essay # 38

This test illustrates the prior art and uses a calcium carbonate sold by the company Omya under the name Omyabond ™ 301. The pour point after 30 days of aging at 23 ° C in formulation 2 is 58.3% lower than that of test n ° 35.

Trial # 39

This test illustrates the prior art and uses a calcium carbonate from test No. 2. The pour point after 30 days of aging at 23 ° C in formulation 2 is 275% higher than for that of test No. 35.

Trial 40

This test illustrates the invention and uses the calcium carbonate of test No. ll. The pour point after 30 days of aging at 23 ° C in formulation 2 is 275% higher than that of test No. 35.

Trial # 41

This test illustrates the invention and uses the calcium carbonate from test No. 12. The pour point after 30 days of aging at 23 ° C in formulation 2 is 319.4% higher than that of test No. 35.

Trial # 42

This test illustrates the invention and uses the calcium carbonate of test No. 13. The pour point after 30 days of aging at 23 ° C. in formulation 2 is 350% higher than that of test n ° 35. Test No. 43 This test illustrates the invention and uses the calcium carbonate from test No. 14. The pour point after 30 days of aging at 23 ° C in formulation 2 is 422.2% higher than that of test No. 35.

All the results of the tests of the example are recorded in the following table 2.

fi- CDv O o ^* “Θ CD. in O fi

EXAMPLE 5

This example relates to the use of the pigments according to the invention as rheology regulator for the preparation of a plastisol based on polyvinyl chloride (PVC) and of formulation distinct from that of Examples 3 and 4.

To do this, formulation 3 is produced with the same operating mode and the same apparatus as in Example 3.

This formulation 3, PVC-based plastisol, is composed of:

- 31.0% by weight of a Vestolit E 7031 ™ PVC resin (Vestolit, Germany), - 43.0% by weight of a DINP plasticizer (Diisononylphthalate), - 1.5% by weight of a Super desiccant Weisskalk 40 (Omya AG, Switzerland), - 1.0% by weight of an EURETEK 505 ™ adhesion promoter (Ciba SC, Switzerland), - 1.0% by weight of an Irgastab 17 M ™ thermal stabilizer ( Ciba SC, Switzerland), - 22.5% by weight of mineral pigment to be tested.

For each of the tests of the example, the viscosity and pour point measurements are carried out according to the same operating procedure and the same equipment as that of the previous example.

Trial n ° 44

Trial 45

This test illustrates the prior art and uses a precipitated calcium carbonate sold by the company Solvay under the name Socal ™ 322. The pour point after 30 days of aging at 23 ° C in formulation 3 is 200% higher than that of test No. 44.

Test No. 46 This test illustrates the prior art and uses a calcium carbonate sold by the company Omya under the name Omyabond ™ 302. The pour point after 30 days of aging at 23 ° C in formulation 3 is 55.3% lower than that of test No. 44.

Trial # 47

This test illustrates the prior art and uses a calcium carbonate sold by the company Omya under the name Omyabond ™ 301. The pour point after 30 days of aging at 23 ° C in formulation 3 is 12.8% higher than that of test n ° 44.

Trial # 48

This test illustrates the invention and uses the calcium carbonate of test No. 15. The pour point after 30 days of aging at 23 ° C in formulation 3 is 342.6% higher than that of test n ° 44.

Essay # 49

This test illustrates the invention and uses the calcium carbonate of test No. 16. The pour point after 30 days of aging at 23 ° C in formulation 3 is 712.8% higher than that of test n ° 44.

Trial 50

This test illustrates the invention and uses the calcium carbonate of test No. 17. The pour point after 30 days of aging at 23 ° C in formulation 3 is 459.6% higher than that of test n ° 44.

Essay # 51

This test illustrates the invention and uses the calcium carbonate of test No. 18. The pour point after 30 days of aging at 23 ° C in formulation 3 is 740.4% higher than that of test n ° 44. 43

All the results of the tests of the example are recorded in the following table 3.

TABLE 3

Reading the results in Table 3 shows that good rheological results are also obtained by using mixtures of fatty acids and fatty alcohols or else by using only fatty alcohols.

Test No. 51 shows that the invention is also applicable during the manufacture of precipitated calcium carbonate.

EXAMPLE 6

This example relates to the use of pigments according to the invention as rheology regulator for the preparation of a plastisol based on polyvinyl chloride (PVC), the formulation of which differs from the formulation of Example 5 by the rate of charge. to test.

To do this, a formulation 4 is produced with the same operating mode and the same apparatus as in Example 3.

This formulation 4, PVC-based plastisol, is composed of:

- 31.0% by weight of a Vestolit E 7031 ™ PVC resin (Vestolit, Germany), - 43.0% by weight of a DINP plasticizer (Diisononylphthalate), - 1.5% by weight of a Super desiccant Weisskalk 40 (Omya AG, Switzerland), - 1.0% by weight of an EURETEK 505 ™ adhesion promoter (Ciba SC, Switzerland), - 1.0% by weight of an Irgastab BZ 529 ™ thermal stabilizer ( Ciba SC, Switzerland), - 15.0% to 22.5% by weight of mineral pigment to be tested.

For each of the tests of the example, the viscosity and pour point measurements are carried out according to the same operating mode and the same equipment as that of the previous example. Essay # 52

This test illustrates the prior art and uses 22.5% of the precipitated calcium carbonate sold by the company Solvay under the name Winnofil SPT. This test serves as a reference.

Essay # 53

This test illustrates the prior art and uses 22.5% of the precipitated calcium carbonate sold by the company Solvay under the name Socal ™ 322. The pour point after 30 days of aging at 23 ° C. in formulation 4 is 42% higher than that of test # 52.

Essay # 54

This test illustrates the invention and uses 20.0% of the calcium carbonate from test No. 21.

Trial 55

This test illustrates the invention and uses 15.0% of the calcium carbonate from test No. 21.

Essay # 56

This test illustrates the invention and uses 20.0% of the calcium carbonate from test No. 22.

Test No 57 This test illustrates the invention and uses 15.0% of the calcium carbonate from test No 22.

All the results of the tests of the example are recorded in the following table 4. TABLE 4

Reading table 4 above shows that the use of pigments according to the invention allows a reduction in the mineral load of plastisols to reach the same pour point as with the pigments usually used of about 33% minimum , which results in a reduction in the weight of the loaded plastisol. EXAMPLE 7

This example illustrates the invention and relates to the use of pigments according to the invention in rigid PVC (rigid polyvinyl chloride) such as the armature of the automobile body with a view to reducing weight while retaining control of the solidity.

In the various tests of the example, the replacement of the calcium carbonate of the prior art with the mineral pigment according to the invention was tested.

In a rigid PVC formulation, it has been sought to compare the influence of the substitution of 100% of the mineral filler of the prior art with a mineral pigment according to the invention.

To do this, the tensile strength (representative of the solidity for those skilled in the art) of the following rigid PVC formulation is measured: - 100 phr. a rigid PVC resin EVIPOLSH 6521 (EVC, Germany), - 1.5 phr. of a Naftorin T 3 tribasic lead sulphate thermal stabilizer (Chemson, England), - 1.5 phr. of a Listab 51 dibasic lead sulphate thermal stabilizer (Chemson, England), - 0.6 phr. of a Ca F 1 lubricant (Hoechst, Germany), - 0.05 phr of an E-Wachs lubricant (Hoechst, Germany), - 30 phr. mineral pigment to be tested.

The rigid PVC resin and the mineral filler to be tested are mixed in a double roller mill (Collin, type 150x400) at a temperature of 190 ° C. The rigid PVC plate is calendered after compression molding in a plate at 190 ° C. (Collin, type P 300 P).

Test pieces from this plate are formed for the tensile test according to DIN 53 455. The measurement of the tensile strength is carried out using the “Zwick / Roell” ™ Z020 instrument and according to DIN 53. 455. Trial # 58

Trial # 59

This test illustrates the prior art and uses the precipitated calcium carbonate sold by the company Solvay under the name Socal ™ 322.

The use of Socal ™ 322 results in the same tensile strength as the use of Winnofil SPT ™.

Trial # 60

This test illustrates the prior art and uses the calcium carbonate sold by the company Omya under the name Hydrocarb ™ 120T. The use of Hydrocarb ™ 120T results in the same tensile strength as the use of Winnofil SPT ™.

Trial # 61

This test illustrates the prior art and uses the calcium carbonate marketed by the company Omya under the name Omyabond ™ 301.

The use of Omyabond ™ 301 results in the same tensile strength as the use of Winnofil SPT ™.

EXAMPLE 8

This example illustrates the invention and relates to mineral pigments according to the invention (tests n ° 62, 63, 64 and 65), their manufacturing process according to the invention (tests n ° 62, 63, 64 and 65), and their use according to the invention in PVC formulations of plastisols type (tests no. 63, 64 and 65).

Essay # 62

This test illustrates the invention and relates to a process for obtaining the pigment according to the invention in which the treatment with 1% of a mixture of fatty acids takes place before the reaction of the calcium carbonate of the marble type with the acid. phosphoric. To do this, dilute 6.974 kg (by weight of dry pigment) of natural calcium carbonate of the Norwegian marble type, with a particle size such that 65% by weight of the particles have a diameter of less than 1 μm, measured using the Sedigraph ™ 5100. from the company Micromeritics ™, in the form of an aqueous suspension of 78% of dry extract, dispersed with 0.5% of a polyacrylate of soda, until an aqueous suspension of a concentration of dry matter of 65% by weight, with distilled water, in a 10 liter ESCO ™ reactor.

Then the suspension thus formed is treated, at a temperature of 70 ° C., with 1% of fatty acid in suspension, which consists of a sunflower oil, based on palmitic acid, stearic acid, oleic acid. , linoleic acid and linolenic acid, and the CAS number of which is 6770.1-08-0.

After 5 minutes of stirring, the suspension thus formed is treated with 1% of phosphoric acid in solution at 10% by weight, with stirring for 30 minutes.

After addition of 94 g of calcium hydroxide of 14% by weight, the suspension has a pH equal to 8.6 and a percentage by weight of dry matter equal to 62.2%. The suspension obtained is dried at 80 ° C. using a Nara ™ MSD-100 dryer. A mineral pigment according to the invention is then obtained.

Trial 63

This test illustrates the invention and relates to a process for obtaining the pigment according to the invention in which the treatment with 1% of a mixture of fatty acids takes place after the reaction of the calcium carbonate of the marble type with the acid. phosphoric. To do this, dilute 0.707 kg (by weight of dry pigment) of natural calcium carbonate of Norwegian marble type, with a particle size such that 65% by weight of the particles have a diameter of less than 1 μm, measured using the Sedigraph ™ 5100. from the company Micromeritics ™, in the form of an aqueous suspension of 78% of dry extract, dispersed with 0.5% of a polyacrylate of soda, until an aqueous suspension of a concentration of dry matter of 65% by weight, with distilled water, in a 10 liter ESCO ™ reactor.

The suspension thus formed is then treated, at a temperature of 70 ° C., with 50% of phosphoric acid in solution at 10% by weight, with stirring for 30 minutes. Then added in powder form, 1% fatty acid, which consists of a mixture of palmitic acid and stearic acid in a ratio 1/1 by weight. After adding 135 g of calcium hydroxide of 14% by weight, the suspension has a pH equal to 8.1 and a percentage by weight of dry matter equal to 7.5%.

The suspension obtained is dried at 80 ° C. using a Nara ™ MSD-100 dryer.

A PVC formulation of plastisol type is then produced, comprising, expressed as a percentage by weight, 33.4% of Vestolit ™ E 7031, 44% of diisononyl phthalate, 1.6% of Weiβkalk ™ Super 40, 1% of Euretek ™ 505 and 20% by weight of the mineral pigment according to the invention obtained previously. The pour point of this composition, measured after 72 hours by methods well known to those skilled in the art, is equal to 548 Pa.

Essay # 64

This test illustrates the invention and relates to a process for obtaining the pigment according to the invention in which the treatment with 0.5% of a mixture of fatty acids takes place after the reaction of the calcium carbonate of the marble type with a mixture of phosphoric acid and sulfuric acid. To do this, dilute 0.698 kg (by weight of dry pigment) of natural calcium carbonate of Norwegian marble type, with a particle size such that 65% by weight of the particles have a diameter of less than 1 μm, measured using the Sedigraph ™ 5100. from the company Micromeritics ™, in the form of an aqueous suspension of 78% dry extract, dispersed with 0.5% of a polyacrylate of soda, until an aqueous suspension of a concentration of dry matter of 65% by weight, with distilled water, in a 10 liter ESCO ™ reactor.

Then the suspension thus formed is treated, at a temperature of 70 ° C., with 50% of a mixture of phosphoric acid and sulfuric acid in solution at 10% by weight, with stirring for 60 minutes. The suspension thus formed is then treated with 0.5% of fatty acid in suspension, which consists of a linseed oil, the composition of which is by weight of 8% of fatty acid having from 12 to 16 carbon atoms, 3% stearic acid, 19% oleic acid, 16% linoleic acid, 52% linolenic acid and 2% acid having 20 to 22 carbon atoms. After addition of 250 g of calcium hydroxide of 14% by weight, the suspension has a pH equal to 8.1 and a percentage by weight of dry matter equal to 7.55%.

The suspension obtained is dried at 80 ° C. using a Nara ™ MSD-100 dryer.

A PVC formulation of plastisol type is then produced, comprising, expressed as a percentage by weight, 35.4% of Vestolit ™ E 7031, 46.8% of diisononyl phthalate,

1.7% of Weiβkalk ™ Super 40, 1.1% of Euretek ™ 505 and 15.0% by weight of the mineral pigment according to the invention obtained previously. The pour point of this composition, measured after 72 hours by methods well known to those skilled in the art, is equal to 510 Pa.

Test n ° 65

This test illustrates the invention and relates to a process for obtaining the pigment according to the invention in which the treatment with 0.2% of a mixture of fatty acids takes place after the reaction of calcium carbonate of the marble type with l 'Phosphoric acid. To do this, dilute 0.694 kg (by weight of dry pigment) of natural calcium carbonate of the Norwegian marble type, with a particle size such that 65% by weight of the particles have a diameter of less than 1 μm, measured using the Sedigraph ™ 5100. from the company Micromeritics ™, in the form of an aqueous suspension of 78% of dry extract, dispersed with 0.77% of a polyacrylate of soda, until an aqueous suspension of a concentration of dry matter of 10% by weight, with distilled water, in a 10 liter ESCO ™ reactor. Then the suspension thus formed is treated, at a temperature of 70 ° C., with 10% of phosphoric acid in solution at 10% by weight, with stirring for 30 minutes. The suspension thus formed is then treated with 2% of fatty acid in suspension, which consists of a coconut acid oil, based on stearic acid, an acid having 10 carbon atoms, an acid having 12 carbon atoms, an acid having 14 carbon atoms, palmitic acid, an acid having 20 to 22 carbon atoms, and the CAS number of which is 67701-05-7.

After addition of 136 g of calcium hydroxide of 14% by weight, the suspension has a pH equal to 9.7 and a percentage by weight of dry matter equal to 10.1%. The suspension obtained is dried at 60 ° C. using a Nara ™ MSD-100 dryer.

A PVC formulation of plastisol type is then produced, comprising, expressed as a percentage by weight, 25.0% of Vestolit ™ E 7031, 33.0% of diisononyl phthalate, 1.2% of Weiβkalk ™ Super 40, 0.8% of Euretek ™ 505 and 40.0% by weight of the mineral pigment according to the invention obtained previously.

The pour point of this composition, measured after 72 hours by methods well known to those skilled in the art, is equal to 502 Pa.

Claims

- Dry mineral pigment characterized in that it contains a product formed in situ by the multiple reaction between a calcium carbonate and: - the reaction product (s) of said carbonate with one or more ion donors H ₃ O ⁺ moderately strong to strong; - the reaction product (s) of said carbonate with CO gas formed in situ and / or coming from an external supply; - one or more compounds of formula RX. - Dry mineral pigment according to claim 1 characterized in that the radical R of the compound or compounds of formula RX represents a saturated or unsaturated carbon radical having from 8 to 24 carbon atoms, such as linear or branched alkyl, alkylaryl, arylalkyl groups , aryls, polyaryls or cyclic or mixtures thereof, and in that the group X of the compound or compounds of formula R-X represents groups such as carboxyl, amine, hydroxyl, phosphonic, or their mixtures. - Dry mineral pigment according to Claim 2, characterized in that the compounds of formula RX are chosen from fatty acids, fatty amines, saturated or unsaturated fatty alcohols, preferably having 8 to 24 carbon atoms such as of the stearic type, oleic, linoleic, myristic, octyl or their own mixtures and very preferably having 16 to 18 carbon atoms, or their mixtures with synthetic or natural fatty compounds, preferably compounds of vegetable origin such as coconut oil or animal origin such as tallow, and very preferably of vegetable origin. - Dry mineral pigment according to one of Claims 1 to 3, characterized in that the moderately strong to strong H ₃ O ⁺ ion donor (s) are chosen from moderately strong to strong acids, or their mixtures generating H ₃ ions O ⁺ , and are preferably chosen from acids having a pK _{a of} less than or equal to 2.5 at 25 ° C. - Dry mineral pigment according to claim 4 characterized in that the strong acid or acids are chosen from acids having a pK _a less than or equal to 0 to 25 ° C, such as sulfuric acid, hydrochloric acid or their mixtures . - Dry mineral pigment according to claim 4 characterized in that the medium strong acid (s) are chosen from acids having a pK _a between 0 and 2.5 inclusive at 25 ° C and more particularly chosen from H ₂ SO ₃ , HSO ^" , H ₃ PO ₄ , or mixtures thereof. -. Dry mineral pigment according to Claim 6, characterized in that the medium strong acid or acids are chosen from the medium strong acids forming almost insoluble salts of bivalent cation, such as calcium in water, that is to say with a solubility of less than 1% by mass - dry mineral pigment according to any one of Claims 1 to 7, characterized in that the calcium carbonate is a natural calcium carbonate and very preferably this natural calcium carbonate is chosen from a marble, a calcite, a chalk, a dolomite or their mixtures - Dry mineral pigment according to any one of Claims 1 to 8, characterized in that it has one on specific surface between 1 m ² / g and 200 m ² / g measured according to the BET method, preferably between 5 m ² / g and 80 m ² / g and very preferably between 20 m ² / g and 60 m ² / g as well than a median diameter, determined by a measurement with Sedigraph ™ 5100, between 0.1 and 50 micrometers, preferably between 1 and 10 micrometers. 0- dry mineral pigment according to any one of claims 1 to 9 characterized in that the humidity is less than 1.50%, this humidity being determined after 2 hours of drying at 120 ° C in a oven at atmospheric pressure. 1- Manufacturing process of a dry mineral pigment containing a product formed in situ by the multiple reaction between a calcium carbonate and the reaction product (s) of said carbonate with one or more ion donors H ₃ O ⁺ moderately strong to strong and the reaction product (s) of said carbonate with CO gas formed in situ and / or coming from an external supply and one or more compounds of formula RX characterized in that it comprises the following stages: a) The treatment of calcium carbonate in the aqueous phase with the medium to strong H ₃ O ⁺ ion donor (s) and the treatment with the gaseous CO ₂ formed in situ, treatment which is an integral part of step a), b) The treatment of calcium carbonate in aqueous phase with the compound (s) of type RX, consisting in the addition, before and / or during and / or after step a), of the compound or compounds of formula RX, c) optionally a anionic or cationic or weakly anionic aqueous suspension of the product obtained in step b) at a dry matter concentration of between 1% and 80%, optionally using at least one anionic or cationic or weakly anionic electrolyte, possibly followed e of a reconcentration, d) optionally the addition of a base, preferably Ca (OH) 2 in order to increase the pH above 6, preferably above 7.5 and more particularly in a value between 8 and 10, e) drying after one of steps b), c) or d): - Method for manufacturing a dry mineral pigment according to claim 11 characterized in that the radical R of the compound or compounds of formula RX represents a saturated or unsaturated carbon radical having from 8 to 24 carbon atoms, such as linear or branched alkyl, alkylaryl, arylalkyl, aryl, polyaryl or cyclic groups or their mixtures, and in that the group X of the compounds of formula RX represent groups such as carboxyl, amine, hydroxyl, phosphonic, or mixtures thereof. - A method of manufacturing a dry mineral pigment according to claim 12 characterized in that the compound or compounds of formula RX are chosen from fatty acids, fatty amines, saturated or unsaturated fatty alcohols, preferably having 8 to 24 atoms carbon such as stearic, oleic, linoleic, myristic, octyl or their own mixtures and having very preferably from 16 to 18 carbon atoms, or mixtures thereof with synthetic or natural fatty compounds, preferably compounds of vegetable origin such as coconut oil or of animal origin such as tallow, and very preferably of vegetable origin .

- A method of manufacturing a dry mineral pigment according to any one of claims 11 to 13 characterized in that the calcium carbonate is a natural calcium carbonate and quite preferably this natural calcium carbonate is chosen from a marble, calcite, chalk, dolomite or their mixtures. - Method for manufacturing a dry mineral pigment according to any one of claims 11 to 14 characterized in that the moderately strong to strong ion donor (s) H ₃ O ⁺ are chosen from moderately strong to strong acids, or their mixtures generating H ₃ O ⁺ ions, and are preferably chosen from acids having a pK _a less than or equal to 2.5 at 25 ° C. - A method of manufacturing a dry mineral pigment according to claim 15 characterized in that the strong acid or acids are chosen from acids having a pKa less than or equal to 0 to 25 ° C, such as sulfuric acid, l hydrochloric acid or mixtures thereof. - A method of manufacturing a dry mineral pigment according to claim 15 characterized in that the one or more moderately strong acids are chosen from acids having a ρK _has between 0 and 2.5 inclusive at 25 ° C. and more particularly chosen from H ₂ SO ₃ , HSO ₄ ^" , H ₃ PO ₄ , or mixtures thereof. - Method for manufacturing a dry mineral pigment according to claim 17 characterized in that the medium strong acid (s) are chosen from the medium strong acid forming salts of divalent cation, such as calcium, almost insoluble in water, that is to say with a solubility of less than 1% by mass. - A method of manufacturing a dry mineral pigment according to any one of claims 11 to 18 characterized in that the strong acid or acids may be mixed with the acid or medium strong acids.

- A method of manufacturing a dry mineral pigment according to any one of claims 11 to 19 characterized in that the quantity in moles of H ₃ O ⁺ ion donors moderately strong to strong relative to the number of moles of CaCO ₃ is in total between 0.001 and 1, preferably between 0.1 and 0.5. - Method of manufacturing a dry mineral pigment according to any one of claims 11 to 19 characterized in that the quantity in moles of compounds of formula RX relative to the number of moles of CaCO ₃ is in total between 0.0001 and 0.1, preferably between 0.002 and 0.01. - A method of manufacturing a dry mineral pigment according to any one of claims 11 to 21 characterized in that step a) can be repeated several times and the order of addition of moderately strong and strong acids is arbitrary with an addition of the RX type compounds, before and / or during and / or after the medium or strong acids. - A method of manufacturing a dry mineral pigment according to any one of claims 11 to 22 characterized in that step b) can be repeated several times. - Method of manufacturing a dry mineral pigment according to any one of claims 11 to 22 characterized in that the temperature during step a) of the treatment is between 5 ° C and 100 ° C, and preferably between 65 ° C and 80 ° C. - Method of manufacturing, a dry mineral pigment according to any one of claims 11 to 22 characterized in that the duration of step a) of the treatment lasts from 0.01 hour to 10 hours and preferably from 0.2 hours to 6 hours. - A method of manufacturing a dry mineral pigment according to any one of claims 11 to 25 characterized in that it is implemented in the aqueous phase at low, medium strong or strong dry matter concentrations, and preferably for a dry matter content of between 1% and 80% by weight. - Process for manufacturing a dry mineral pigment according to any one of claims 11 to 25 characterized in that step c) uses from 0.01% to 5.0% by dry weight of an electrolyte anionic chosen from homopolymers or copolymers in the non-neutralized, partially neutralized or totally neutralized acid state, monomers with ethylenic establishment and with monocarboxylic function such as acrylic or methacrylic acid or also the hemiesters of diacids such as mono esters in C 1 to C ₄ maleic or itaconic acids, or their mixtures, or having a dicarboxylic function chosen from monomers with ethylenic unsaturation and di-carboxylic function such as crotonic, isocrotonic, cinnamic, itaconic, maleic acid, or even anhydrides of carboxylic acids, such as maleic anhydride or with a sulfonic function chosen from ethylenically unsaturated monomers with a sulfonic function, such as ac ide acrylamido-methyl-propane-sulfonic, sodium methallyl sulfonate, vinyl sulfonic acid and styrene sulfonic acid or alternatively with phosphoric function chosen from ethylenically unsaturated and phosphoric function monomers such as vinyl phosphoric acid, ethylene glycol methacrylate phosphate, propylene glycol methacrylate phosphate, ethylene glycol acrylate phosphate, propylene glycol acrylate phosphate and their ethoxylates or alternatively with phosphonic function chosen from unsaturated monomers ethylenic and phosphonic function such as vinyl phosphonic acid, or mixtures thereof, or also polyphosphates. - Method of manufacturing, a dry mineral pigment according to any one of claims 11 to 25 characterized in that step c) implements, in a particular way, from 0.01% to 5.0% by weight dryness of a cationic electrolyte chosen from homopolymers or copolymers of cationic monomers or ethylenically unsaturated quaternary ammonium such as [2- (methacryloyloxy) ethyl] trimethyl ammonium chloride or sulfate, [2- (acryloyloxy) ethyl] trimethyl ammonium chloride or sulfate, [3- (acrylamido) propyl] trimethyl ammonium chloride or sulfate, dimethyl diallyl ammonium chloride or sulfate, [3- (methacrylamido) propyl] trimethyl ammonium chloride or sulfate. - Method of manufacturing, a dry mineral pigment according to any one of claims 11 to 25 characterized in that step c) implements, in a particular way, from 0.01% to 5.0% by weight dryness of a weakly anionic electrolyte chosen from the weakly ionic and water-soluble copolymer consisting of: a) at least one anionic monomer and having a carboxylic or dicarboxylic or phosphoric or phosphonic or sulfonic function or their mixture, b) at least one nonionic monomer, the nonionic monomer consisting of at least one monomer of formula (I):

in which: - m and p represent a number of alkylene oxide units less than or equal to 150, - n represents a number of ethylene oxide units less than or equal to 150, - q represents an integer at less equal to 1 and such that 5 ≤ (m + n + p) q ≤ 150, and preferably such that 15 ≤ (m + n + p) q ≤ 120 - Ri 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 function, preferably belonging to the group of vinyls as well as to the group of acrylic, methacrylic, maleic, itaconic, crotonic, vinylphthalic esters as well as 'to the group of unsaturated urethanes such as acrylurethane, methacrylurethane,. -. 'dimethyl-isopropenyl-benzylurethane, allylurethane, as well as to the group of substituted or unsubstituted allylic or vinyl ethers, or also to the group of ethylenically unsaturated amides or imides, - R' represents hydrogen or a hydrocarbon radical having 1 to 40 carbon atoms, and preferably represents a hydrocarbon radical having 1 to 12 carbon atoms and very preferably a hydrocarbon radical having 1 to 4 carbon atoms, or a mixture of several monomers of formula (I), c) optionally at least at least one monomer of the acrylamide or methacrylamide type or their derivatives such as N- [3- (dimethylamino) propyl] acrylamide or N- [3- (dimethylamino) propyl] methacrylamide, and mixtures thereof, or alternatively at least a non-water-soluble monomer such as alkyl acrylates or methacrylates, unsaturated esters such as N- [2- (dimethylamino) ethyl] methacrylate, or N- [2- (dimethylamino) ethyl acrylate), vinyls such as vinyl acetate, vinylpyrrolidone, styrene, palphamethylstyrene and their derivatives, or at least one cationic or quaternary ammonium monomer such as [2- (methacryloyloxy) ethyl chloride or sulfate] trimethyl ammonium , [2- (acryloyloxy) ethyl] trimethyl ammonium chloride or sulfate, [3- (acrylamido) propyl] trimethyl ammonium chloride or sulfate, dimethyl diallyl ammonium chloride or sulfate, chloride or sulfate of [3- (methacrylamido) propyl] trimethyl ammonium, or of at least one organofluorinated or organosililated monomer, or of the mixture of several of these monomers, d) optionally of at least one monomer having at least two ethylenic unsaturations called monomer crosslinking. - Dry mineral pigment containing a product formed in situ by the multiple reaction between a calcium carbonate and the reaction product (s) of said carbonate with one or more moderately strong to strong H ₃ O ⁺ ion donors and the product (s) of reacting said carbonate with CO ₂ gas formed in situ and / or coming from an external supply and one or more compounds of formula RX characterized in that it is obtained by the process according to any one of claims 11 to 29 - Dry mineral pigment according to claim 30 characterized in that it has a specific surface, determined according to the BET ISO 9277 method, of between 1 m ² / g and 200 m ² / g measured, preferably between 5 m ² / g and 80 m ² / g and very preferably between 20 m ² / g and 60 m ² / g as well as a median diameter, determined by a measurement with Sedigraph ™ 5100, between 0.1 and 50 micrometers, preferably between 1 and 10 micrometers. - Aqueous suspension of the mineral pigment obtained according to steps c) to d) of the method according to any one of claims 11 to 27 characterized in that the mineral pigment has a specific surface, determined according to the BET method (ISO 9277), included between 1 m ² / g and 200 m ² / g, preferably between 5 m ² / g and 80 m ² / g and very preferably between 10 m ² / g and 60 m ² / g as well as a median diameter, determined by a measurement with Sedigraph ™ 5100, between 0.1 and 50 micrometers, preferably between 1 and 10 micrometers, and in that the suspension has a dry matter content of between 1% and 80% and in that it contains 0.05% to 5.0% by dry weight, relative to the dry weight of calcium carbonate, of at least one anionic electrolyte. - Aqueous suspension of the mineral pigment according to claim 32 characterized in that the anionic electrolyte is chosen from the anionic electrolytes according to claim 27. - Aqueous suspension of the mineral pigment obtained according to steps c) to d) of the method according to one any one of claims 11 to 26 and 28 characterized in that the mineral pigment has a specific surface, determined according to the BET method (ISO 9277), between 1 m ² / g and 200 m ² / g, preferably between 5 m ² / g and 80 m ² / g and very preferably between 20 m ² / g and 60 m ² / g as well that a median diameter, determined by a measurement with Sedigraph ™ 5100, of between 0.1 and 50 micrometers, preferably between 1 and 10 micrometers, and in that the suspension has a dry matter content of between 1% and 80% and in that it contains from 0.1% to 5.0% by dry weight, relative to the dry weight of calcium carbonate, of at least one cationic electrolyte. - Aqueous suspension of the mineral pigment according to claim 34 characterized in that the cationic electrolyte is chosen from the cationic electrolytes according to claim 28. - Aqueous suspension of the mineral pigment obtained according to steps c) to d) of the method according to one any one of claims 11 to 26 and 29 characterized in that the mineral pigment has a specific surface, determined according to the BET method (ISO 9277), of between 1 m ² / g and 200 m ² / g measured according to the BET method, preferably between 5 m ² / g and 80 m ² / g and very preferably between 20 m ² / g and 60 m ² / g as well as a median diameter, determined by a measurement with Sedigraph ™ 5100, between 0.1 and 50 micrometers, preferably between 1 and 10 micrometers and in that the suspension has a dry matter content of between 0.3% and 80%, and preferably in that it contains from 15% to 60% by dry weight, relative by dry weight of carbonate calcium, from at least one weakly anionic electrolyte. - Aqueous suspension of the mineral pigment according to claim 36 characterized in that the weakly anionic electrolyte is chosen from the weakly anionic electrolytes according to claim 29. - Use of the dry mineral pigment according to any one of claims 1 to 10 and 30 to 31 as a rheology-regulating filler for plastisol and rigid polyvinyl chloride (PVC) type formulations, in particular as a filler for controlling viscosity while retaining the strength of the formulations plastisols, rigid PVC. - Use of the dry mineral pigment according to claim 38 in the automotive industry, in particular in protective underbody coatings for automobiles. - Use of the dry mineral pigment according to any one of claims 1 to 10 and 30 to 31 in the fields of paint and / or sealants and / or coatings. - Use of the aqueous suspension of the mineral pigment according to any one of claims 32 to 37 as a rheology-regulating filler of formulations of plastisol and rigid polyvinyl chloride (PVC) type, in particular as a filler for controlling the viscosity while preserving the solidity of rigid plastisol, PVC formulations. - Use of the aqueous suspension of the mineral pigment according to claim 41 in the automotive industry, in particular in protective coatings for the automobile underbody. - Use of the aqueous suspension of the mineral pigment according to any one of claims 32 to 37 in the fields of paint and / or sealants and / or coatings. - Plastisol formulation characterized in that it contains the dry mineral pigment according to any one of Claims I to 10 and 30 to 31. - Plastisol formulation characterized in that it contains the aqueous suspension of the mineral pigment according to any one of claims 32 to 37. - Rigid PVC formulation characterized in that it contains the dry mineral pigment according to any one of claims 1 to 10 and 30 to 31. - Rigid PVC formulation characterized in that it contains the suspension aqueous mineral pigment according to any one of claims 32 to 37. - protective underbody coating for cars characterized in that it contains the dry mineral pigment according to any one of claims 1 to 10 and 30 to 31 in quantity ranging from 0.05% to 50%, preferably from 1% to 20%, more preferably from 5% to 15%. - Paint and / or sealant and / or coating formulation characterized in that it contains the dry mineral pigment according to any one of claims 1 to 10 and 30 to 31. - Paint and / or sealant and / or coating formulation characterized in that it contains the aqueous suspension of the mineral pigment according to any one of claims 32 to 37.