EP0000415A1 - Verfahren zur Herstellung von wässrigen Suspensionen, die wenigstens 65 Gew. % Calciumkarbonat enthalten - Google Patents

Verfahren zur Herstellung von wässrigen Suspensionen, die wenigstens 65 Gew. % Calciumkarbonat enthalten Download PDF

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Publication number
EP0000415A1
EP0000415A1 EP78200085A EP78200085A EP0000415A1 EP 0000415 A1 EP0000415 A1 EP 0000415A1 EP 78200085 A EP78200085 A EP 78200085A EP 78200085 A EP78200085 A EP 78200085A EP 0000415 A1 EP0000415 A1 EP 0000415A1
Authority
EP
European Patent Office
Prior art keywords
calcium carbonate
process according
polyelectrolyte
concentrate
dispersing agent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP78200085A
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English (en)
French (fr)
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EP0000415B1 (de
Inventor
Jacques Brahm
Jean-Pierre De Rath
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Solvay SA
Original Assignee
Solvay SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Solvay SA filed Critical Solvay SA
Publication of EP0000415A1 publication Critical patent/EP0000415A1/de
Application granted granted Critical
Publication of EP0000415B1 publication Critical patent/EP0000415B1/de
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D17/00—Pigment pastes, e.g. for mixing in paints
    • C09D17/004—Pigment pastes, e.g. for mixing in paints containing an inorganic pigment
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00—Compounds of calcium, strontium, or barium
    • C01F11/18—Carbonates
    • C01F11/182—Preparation of calcium carbonate by carbonation of aqueous solutions and characterised by an additive other than CaCO3-seeds
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00—Compounds of calcium, strontium, or barium
    • C01F11/18—Carbonates
    • C01F11/182—Preparation of calcium carbonate by carbonation of aqueous solutions and characterised by an additive other than CaCO3-seeds
    • C01F11/183—Preparation of calcium carbonate by carbonation of aqueous solutions and characterised by an additive other than CaCO3-seeds the additive being an organic compound
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00—Compounds of calcium, strontium, or barium
    • C01F11/18—Carbonates
    • C01F11/185—After-treatment, e.g. grinding, purification, conversion of crystal morphology
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/02—Compounds of alkaline earth metals or magnesium
    • C09C1/021—Calcium carbonates
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/385—Oxides, hydroxides or carbonates
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/52—Cellulose; Derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/51—Particles with a specific particle size distribution
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/60—Particles characterised by their size
    • C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/60—Particles characterised by their size
    • C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer

Definitions

  • the subject of the present invention is the preparation of concentrated aqueous suspensions of calcium carbonate, by crystallization of calcium carbonate in an aqueous medium.
  • concentrated aqueous generally containing from 65 to 80% by weight of crystals.
  • This known method has the disadvantage of requiring an expensive grinding operation. This is in fact imposed by the need to break up the numerous coarse agglomerates of calcium carbonate crystals present in the wet calcium carbonate concentrate. Besides its unfavorable influence on the cost of the process, this grinding operation has the drawback of giving rise to the formation of calcium carbonate fines, which are generally not suitable as a filler.
  • the filter cakes obtained by this known process are in the form of aqueous suspensions of fine crystals, very suitable as a filler in stationery, in plastics and in paints.
  • concentration of calcium carbonate crystals in these aqueous suspensions is generally insufficient to allow them to be stored and handled economically, so that it is necessary to concentrate them by evaporating them.
  • the Applicant has now found that by carrying out the crystallization under specific conditions, it is possible to obtain concentrated aqueous suspensions of fine and regular crystals of calcium carbonate, generally containing more than 65% by weight of dry matter, without requiring grinding or evaporation.
  • the invention therefore relates to a process for the preparation of aqueous suspensions containing at least 65% by weight of calcium carbonate, according to which calcium carbonate is crystallized in dilute aqueous medium, the dilute aqueous suspension of calcium carbonate is separated resulting, a wet calcium carbonate concentrate and said calcium carbonate concentrate is fluidized and homogenized in the presence of a dispersing agent, the crystallization of the calcium carbonate being carried out in the presence of a water-soluble polyelectrolyte and the separation of the wet concentrate from the diluted aqueous suspension being carried out by mechanical means.
  • polyelectrolyte is meant a polymeric substance whose monomeric units have ionizable groups, and which is composed, on the one hand, of a macroion formed of ionic groups of the same sign, linked together by chemical bonds and, on the other hand, a series of counterions of charge opposite to that of the macroion (Encyclopedia of Polymer Science and Technology - John Wiley & Sons - 1969 - Vol.10, p.781).
  • polyacids or their salts, which are polyelectrolytes which, when dissociating, give rise to polymeric anions (polyanions) and to elementary cations such as, for example, protons or monovalent cations derived from alkali metals (Op. cit., p.781 to 784).
  • Polyacids with a weak acid character are preferably used, defined as being polyacids whose pK, measured on a solution of O, OIN in pure water, is greater than 4, preferably 6 (Op. Cit., P .787 to 788).
  • Polyacids with a weak acid character which are very suitable in the context of the invention are those derived from polymers comprising at least one carboxylic group per 10 carbon atoms.
  • polyacids which can be used in the process according to the invention mention may in particular be made of polymers derived from acrylic, methacrylic and alpha-hydroxyacrylic acids, copolymers of maleic acid, carboxylated derivatives of cellulose ethers, and their alkali metal salts.
  • particularly advantageous polyelectrolytes include the alkali metal salts of polyacrylic acids and their derivatives such as poly-alpha-hydroxyacrylic acids, more particularly that known under the name of Polysel CA (BASF) which is based on sodium polyacrylate.
  • BASF Polysel CA
  • the crystallization of calcium carbonate in an aqueous medium can be carried out by any means known per se, for example by reacting a solution of calcium salt and a solution of ammonium carbonate or of alkali metal .
  • the crystallization of calcium carbonate is advantageously carried out by carbonating a milk of lime, preferably by means of a gas containing CO 2 .
  • a lime milk titrating between 25 and 350, preferably between 50 and 250, kg of CaO per m 3 which is prepared in a manner well known per se , by dispersing quicklime in water from the calcination of limestone in a lime kiln.
  • a gas poor in C0 2 for example boiler fumes containing 5 to 15% by volume of C0 2 .
  • a gas rich in CO 2 containing more than 30% of CO 2 ' such as the gas recovered from lime kilns.
  • the respective amounts of lime milk and carbonation gas must be sufficient to ensure as complete carbonation of the lime as possible. These quantities obviously depend on the respective concentrations of the milk of lime and of the gas, as well as on the working conditions, and they can, in each particular case, be easily established by experience.
  • the crystallization is preferably carried out at a temperature of the order of 25 to 60 ° C, for example around 30 to 50 ° C.
  • the amount of polymer incorporated into the aqueous medium depends on various factors, including the working conditions during crystallization and the nature of the polymer used; it can be easily determined by experience, in each case.
  • the calcium carbonate is crystallized by carbonating a lime milk
  • calcium carbonate concentrate is understood to mean a wet cake of calcium carbonate, which has been formed from the abovementioned dilute aqueous suspension of calcium carbonate.
  • essentially mechanical separation means means means by which a suspension of solid material in a liquid is subjected to physical separation into at least one phase highly concentrated in solid matter and one phase very diluted, without additional addition of solid matter in the suspension or change in state of one or the other constituent of the suspension, in particular without evaporation, or solidification of the liquid.
  • a mechanical separation means it is possible, for example, in accordance with the invention, to use filtration, wringing or decantation of the dilute aqueous suspension, which are techniques well known per se. As a variant, it is also possible to combine two or more separate mechanical separation means.
  • filtration which is a technique well known per se, the filter cake collected on the filter then constituting the aforementioned wet concentrate.
  • filtration of the diluted suspension is advantageously carried out under pressure, for example between 0.5 and 15 kg / cm 2 , and it is optionally followed by compression of the filter cake under a pressure between 1 and 20 kg / cm 2 and a sweep by a current of air under a pressure of 0.5 to 6 kg / cm 2 .
  • the temperature at which filtration is carried out and any compression and sweeping has not been found to have a significant influence on the filtration result. In general, it can for example be carried out between 15 and 50 ° C, advantageously at room temperature.
  • the fluidization of the calcium carbonate concentrate consists in subjecting it to mechanical work which transforms it into a fluid, pumpable aqueous suspension. It is generally carried out, in a manner known per se, by mixing the concentrate, for example by means of a paddle, disc or rotary cone mixer.
  • the purpose of homogenization is to ensure an efficient, homogeneous dispersion of the calcium carbonate crystals in the above-mentioned fluid aqueous suspension resulting from the fluidization operation. It is generally obtained by subjecting it to turbulence or intense shearing work by means of a high-speed disperser, for example of the paddle, disc or knife type.
  • the fluidization and the homogenization are preferably carried out separately.
  • the dispersing agent used during fluidization and homogenization has the function of facilitating the dispersion of the calcium carbonate crystals, avoiding the formation of crystal agglomerates. It may for example consist of an inorganic dispersing agent, such as the commercial dispersing agent known under the name of Calgon (Calgon Corp.), which is based on alkali metal polyphosphate. As a variant, the dispersing agent may also consist, at least partially, of an organic dispersing agent, for example a dispersing agent chosen from polyelectrolytes, preferably polyacids.
  • Dispersing agents which have been found to be particularly effective are those known under the names of Polysel CA (BASF) which is a dispersing agent based on sodium polyacrylate and Dispagil (Rhône-Progil) which is a dispersing agent based on ae alkali metal polyphosphate and polyacrylate.
  • BASF Polysel CA
  • Rhône-Progil Dispagil
  • the dispersing agent is preferably added to the calcium carbonate concentrate before carrying out the fluidization and homogenization. It can optionally be added to the dilute aqueous suspension of calcium carbonate, before separation of the calcium carbonate concentrate. However, it has been observed in practice that it is preferable to add the dispersing agent to the calcium carbonate concentrate, after having separated it from the aqueous suspension, since this results, all other things being equal, a decrease in the amount of dispersing agent required.
  • the amount of dispersing agent used to fluidize and homogenize the calcium carbonate concentrate depends on various factors, including the nature of the dispersing agent, the particle size of the calcium carbonate crystals and the calcium carbonate content of the concentrate. It can be easily determined by experience in each case. In general, it is advantageously between 2 and 10 g, preferably 4 and 8 g, per kg of calcium carbonate from the concentrate.
  • the process according to the invention makes it possible to obtain easily, quickly and economically, concentrated, stable aqueous suspensions of regular crystals of calcium carbonate, generally containing at least 65 X, preferably from 68 to 75 X, by weight of crystals, without the need for expensive evaporation treatment or grinding.
  • These concentrated suspensions lend themselves well to long-term storage and handling, without their stability being affected.
  • the calcium carbonate crystals they contain are well formed and regular and are well suited as a filler in stationery, paints and in the manufacture of plastics.
  • a milk of lime was carbonated with a gas containing CO 2.
  • the dilute aqueous suspension of calcium carbonate thus obtained was then filtered under a maximum pressure of 4.5 kg / cm 2 , the filter cake obtained was compressed under a maximum pressure of 17 kg / cm 2 to wring it out, then subjected to an air sweep under pressure equal to 5.3 kg / cm 2 for 10 minutes, thus providing a wet concentrate of calcium carbonate.
  • This calcium carbonate concentrate was then fluidized and then homogenized by successively passing through a kneader then through a disperser, thus providing an aqueous suspension. calcium carbonate.
  • Examples 1 and 2 relate to tests in accordance with the invention.
  • Polysel CA which is a commercial polyelectrolyte based on sodium polyacrylate, was introduced into the milk of lime, which titrated approximately 120 kg of CaO per m 3 .
  • the amount of Polysel CA introduced into the milk of lime was adjusted so that it corresponds approximately to 2.5 g of Polysel CA per kg of crystallized calcium carbonate.
  • the milk of lime was then carbonated with a gas containing between 23 and 27% of CO 2 , at a flow rate of 1350 m 3 / h, for 7 h 15 min. The temperature was maintained at 37 ° C.
  • the calcium carbonate concentrate collected on the filter was fluidized and homogenized in the presence of Calgon which is a commercial dispersing agent based on sodium polyphosphate. 7 g of Calgon were used per kg of calcium carbonate in the concentrate. There was thus obtained a concentrated aqueous suspension containing 68 X of regular crystals of calcium carbonate. This aqueous suspension remained stable for more than 30 days.
  • Example 1 The test of Example 1 was repeated, using a milk of lime titrating about 120 kg of CaO per m 3 and a gas containing between 29 and 32% of CO 2 .
  • the carbonation carried out at 32 ° C, lasted 7h35min., With a gas flow of between 1200 and 1350 m 3 / h.
  • the amount of Polysel CA was adjusted to correspond to 5 g per kg of calcium carbonate.
  • the concentrated aqueous suspension of calcium carbonate obtained contained 71.7% by weight of calcium carbonate crystals; it remained stable for more than 30 days.
  • Example 1 The test of Examples 1 and 2 was repeated, but omitting to add a polyelectrolyte to the milk of lime.
  • Lime milk was used titrating about 122 kg of CaO per m and a gas containing between 24 and 32% CO 2 , at a flow rate set between 1350 and 1500 m 3 / h for 6 h 30 min. The temperature was maintained between 32 and 34 ° C for the duration of the carbonation.
  • the aqueous suspension of calcium carbonate was filtered, and the concentrated calcium carbonate collected on the filter was subjected to a fluidization and homogenization operation as described in Example 1. There was thus obtained an aqueous suspension of calcium carbonate crystals barely containing 63.7% by weight of crystals. This aqueous suspension was also found to be significantly less stable than that of Examples 1 and 2.
  • Example 3 On the other hand, immediately reveals the advantage of the process according to the invention which makes it possible to obtain easily, without evaporation, by simple filtration, stable aqueous suspensions containing more than 68% by weight of calcium carbonate crystals.
EP78200085A 1977-07-11 1978-07-07 Verfahren zur Herstellung von wässrigen Suspensionen, die wenigstens 65 Gew. % Calciumkarbonat enthalten Expired EP0000415B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU77723A LU77723A1 (fr) 1977-07-11 1977-07-11 Procede pour la preparation de suspensions aqueuses concentrees de carbonate de calcium
LU77723 1977-07-11

Publications (2)

Publication Number Publication Date
EP0000415A1 true EP0000415A1 (de) 1979-01-24
EP0000415B1 EP0000415B1 (de) 1981-04-29

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP78200085A Expired EP0000415B1 (de) 1977-07-11 1978-07-07 Verfahren zur Herstellung von wässrigen Suspensionen, die wenigstens 65 Gew. % Calciumkarbonat enthalten

Country Status (12)

Country Link
US (1) US4242318A (de)
EP (1) EP0000415B1 (de)
JP (1) JPS5418498A (de)
AT (1) AT372695B (de)
BG (1) BG49609A3 (de)
DE (1) DE2860643D1 (de)
DK (1) DK308478A (de)
ES (1) ES471586A1 (de)
FI (1) FI62272C (de)
IN (1) IN147648B (de)
IT (1) IT1099568B (de)
LU (1) LU77723A1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0035640A2 (de) * 1980-02-08 1981-09-16 Hoechst Aktiengesellschaft Hochkonzentrierte Füllstoffslurries
EP0108842A1 (de) * 1982-11-10 1984-05-23 Ciba Specialty Chemicals Water Treatments Limited Calciumcarbonat dispersionen
EP0120808A2 (de) * 1983-02-25 1984-10-03 Ciba-Geigy Ag Feinteiliges Calciumcarbonat und Verfahren zu dessen Herstellung
EP0296610A2 (de) * 1987-06-24 1988-12-28 Maruo Calcium Company Limited Dispersion von Kalzium-Karbonat in Glycol
EP0850685A2 (de) * 1996-12-27 1998-07-01 Ecc International Limited Dispergierte wässrige Suspensionen
US10040694B2 (en) 2011-10-05 2018-08-07 Imerys Sa Precipitated calcium carbonate particles and use thereof

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JPS5826031A (ja) * 1981-08-05 1983-02-16 Mitsubishi Gas Chem Co Inc 分散性の良い炭酸カルシウムの製造方法
US4756897A (en) * 1986-06-23 1988-07-12 Kerr-Mcgee Corporation Process for preparing concentrated byproduct nitrate solutions
US4732748A (en) * 1986-12-10 1988-03-22 Cyprus Mines Corporation Finely divided calcium carbonate compositions
US4888308A (en) * 1987-02-10 1989-12-19 Chemical Products Corporation Glass manufacture using dense, unsintered, granular alkaline earth metal carbonates
US5275650A (en) * 1987-10-23 1994-01-04 Coatex S.A. Agent for grinding lime to augment its reactivity
US5181662A (en) * 1989-01-27 1993-01-26 Coatex S.A. Process for grinding calcium carbonate in aqueous media
US5593488A (en) * 1995-08-24 1997-01-14 Ecc International Inc. Acid resistant calcium carbonate composition and uses therefor
US5531821A (en) * 1995-08-24 1996-07-02 Ecc International Inc. Surface modified calcium carbonate composition and uses therefor
US5593489A (en) * 1995-10-20 1997-01-14 Ecc International Inc. Acid resistant carbonate composition containing an aluminum or magnesium hydroxide methods of preparation and uses therefor
US5711799A (en) * 1996-03-13 1998-01-27 Ecc International Inc. Acid tolerant calcium carbonate composition and uses therefor
US5653797A (en) * 1996-04-26 1997-08-05 National Gypsum Company Ready mixed setting-type joint compound and method of making same
KR100190596B1 (ko) * 1996-05-03 1999-06-01 규 재 유 0.1-1.0 마이크로미터의 탄산칼슘 제조법
US6083317A (en) * 1996-11-05 2000-07-04 Imerys Pigments, Inc. Stabilized calcium carbonate composition using sodium silicate and one or more weak acids or alum and uses therefor
GB9624085D0 (en) * 1996-11-20 1997-01-08 Ecc Int Ltd Precipitates and their production
US6228161B1 (en) * 1996-12-30 2001-05-08 Minerals Technologies Inc. Use of calcium carbonate in an acidic aqueous media
JP2002533294A (ja) 1998-12-23 2002-10-08 イメリーズ ミネラルズ リミテッド 濃縮炭酸塩懸濁剤
US6251356B1 (en) 1999-07-21 2001-06-26 G. R. International, Inc. High speed manufacturing process for precipitated calcium carbonate employing sequential perssure carbonation
US7048900B2 (en) 2001-01-31 2006-05-23 G.R. International, Inc. Method and apparatus for production of precipitated calcium carbonate and silicate compounds in common process equipment
US6937153B2 (en) * 2002-06-28 2005-08-30 Appleton Papers Inc. Thermal imaging paper laminate
FR2894846B1 (fr) * 2005-12-20 2008-02-01 Coatex Sas Utilisation de dispersants pour concentrer des matieres minerales dans l'eau, dispersions obtenues et leurs utilisations.
US7468101B2 (en) * 2006-08-17 2008-12-23 Specialty Minerals (Michigan) Inc. UV varnish gloss performance using novel pigment and process for making same
SI2292701T1 (sl) * 2009-07-01 2014-01-31 Omya International Ag Postopek za izboljšanje opacitete
KR20120117760A (ko) * 2009-11-27 2012-10-24 바스프 에스이 중합체 함유 코팅의 제조 방법

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0035640A2 (de) * 1980-02-08 1981-09-16 Hoechst Aktiengesellschaft Hochkonzentrierte Füllstoffslurries
EP0035640B1 (de) * 1980-02-08 1985-01-16 Hoechst Aktiengesellschaft Hochkonzentrierte Füllstoffslurries
EP0108842A1 (de) * 1982-11-10 1984-05-23 Ciba Specialty Chemicals Water Treatments Limited Calciumcarbonat dispersionen
EP0120808A2 (de) * 1983-02-25 1984-10-03 Ciba-Geigy Ag Feinteiliges Calciumcarbonat und Verfahren zu dessen Herstellung
EP0120808A3 (de) * 1983-02-25 1987-06-16 Ciba-Geigy Ag Feinteiliges Calciumcarbonat und Verfahren zu dessen Herstellung
EP0296610A2 (de) * 1987-06-24 1988-12-28 Maruo Calcium Company Limited Dispersion von Kalzium-Karbonat in Glycol
EP0296610A3 (de) * 1987-06-24 1990-12-12 Maruo Calcium Company Limited Dispersion von Kalzium-Karbonat in Glycol
EP0850685A2 (de) * 1996-12-27 1998-07-01 Ecc International Limited Dispergierte wässrige Suspensionen
EP0850685A3 (de) * 1996-12-27 1999-01-07 Ecc International Limited Dispergierte wässrige Suspensionen
US6140376A (en) * 1996-12-27 2000-10-31 Imerys Minerals, Ltd. Dispersed aqueous suspensions
US10040694B2 (en) 2011-10-05 2018-08-07 Imerys Sa Precipitated calcium carbonate particles and use thereof

Also Published As

Publication number Publication date
LU77723A1 (fr) 1979-03-26
JPS6317771B2 (de) 1988-04-15
IT1099568B (it) 1985-09-18
IT7825558A0 (it) 1978-07-11
AT372695B (de) 1983-11-10
FI62272B (fi) 1982-08-31
FI781991A (fi) 1979-01-12
DE2860643D1 (en) 1981-08-06
ES471586A1 (es) 1979-01-16
JPS5418498A (en) 1979-02-10
EP0000415B1 (de) 1981-04-29
IN147648B (de) 1980-05-17
US4242318A (en) 1980-12-30
ATA496878A (de) 1983-03-15
DK308478A (da) 1979-01-12
FI62272C (fi) 1982-12-10
BG49609A3 (en) 1991-12-16

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