MX2017008892A - Proceso para obtener un ccm ultrafino con propiedades de dispersion luminosa elevadas y contenido de solidos elevado. - Google Patents

Proceso para obtener un ccm ultrafino con propiedades de dispersion luminosa elevadas y contenido de solidos elevado.

Info

Publication number
MX2017008892A
MX2017008892A MX2017008892A MX2017008892A MX2017008892A MX 2017008892 A MX2017008892 A MX 2017008892A MX 2017008892 A MX2017008892 A MX 2017008892A MX 2017008892 A MX2017008892 A MX 2017008892A MX 2017008892 A MX2017008892 A MX 2017008892A
Authority
MX
Mexico
Prior art keywords
solid content
light scattering
applications
scattering properties
calcium carbonate
Prior art date
Application number
MX2017008892A
Other languages
English (en)
Inventor
Gantenbein Daniel
Endre Orten Rolf
Philipp Weihs Jan
A C Gane Patrick
Hunziker Philipp
Høyem Amundsen Asbjørn
Sandvik Tommy
JENSEN Bjørn
Original Assignee
Omya Int Ag
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 Omya Int Ag filed Critical Omya Int Ag
Publication of MX2017008892A publication Critical patent/MX2017008892A/es

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Classifications

    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09CTREATMENT 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
    • C09C1/00Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/02Compounds of alkaline earth metals or magnesium
    • C09C1/021Calcium carbonates
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K33/00Medicinal preparations containing inorganic active ingredients
    • A61K33/06Aluminium, calcium or magnesium; Compounds thereof, e.g. clay
    • A61K33/10Carbonates; Bicarbonates
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61QSPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
    • A61Q1/00Make-up preparations; Body powders; Preparations for removing make-up
    • A61Q1/02Preparations containing skin colorants, e.g. pigments
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01FCOMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00Compounds of calcium, strontium, or barium
    • C01F11/18Carbonates
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01FCOMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00Compounds of calcium, strontium, or barium
    • C01F11/18Carbonates
    • C01F11/185After-treatment, e.g. grinding, purification, conversion of crystal morphology
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/66Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B14/00Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02Granular materials, e.g. microballoons
    • C04B14/26Carbonates
    • C04B14/28Carbonates of calcium
    • CCHEMISTRY; METALLURGY
    • C05FERTILISERS; MANUFACTURE THEREOF
    • C05DINORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
    • C05D3/00Calcareous fertilisers
    • C05D3/02Calcareous fertilisers from limestone, calcium carbonate, calcium hydrate, slaked lime, calcium oxide, waste calcium products
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00Use of inorganic substances as compounding ingredients
    • C08K3/18Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24Acids; Salts thereof
    • C08K3/26Carbonates; Bicarbonates
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09CTREATMENT 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
    • C09C1/00Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/02Compounds of alkaline earth metals or magnesium
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09CTREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C3/00Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
    • C09C3/006Combinations of treatments provided for in groups C09C3/04 - C09C3/12
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63Inorganic compounds
    • D21H17/67Water-insoluble compounds, e.g. fillers, pigments
    • D21H17/675Oxides, hydroxides or carbonates
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00Particle morphology
    • C01P2004/51Particles with a specific particle size distribution
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00Particle morphology
    • C01P2004/60Particles characterised by their size
    • C01P2004/61Micrometer sized, i.e. from 1-100 micrometer
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00Particle morphology
    • C01P2004/60Particles characterised by their size
    • C01P2004/62Submicrometer sized, i.e. from 0.1-1 micrometer
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00Physical properties of inorganic compounds
    • C01P2006/12Surface area
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00Physical properties of inorganic compounds
    • C01P2006/22Rheological behaviour as dispersion, e.g. viscosity, sedimentation stability
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00Physical properties of inorganic compounds
    • C01P2006/60Optical properties, e.g. expressed in CIELAB-values
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00Use of inorganic substances as compounding ingredients
    • C08K3/18Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24Acids; Salts thereof
    • C08K3/26Carbonates; Bicarbonates
    • C08K2003/265Calcium, strontium or barium carbonate

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Geology (AREA)
  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Medicinal Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Polymers & Plastics (AREA)
  • Animal Behavior & Ethology (AREA)
  • Veterinary Medicine (AREA)
  • Ceramic Engineering (AREA)
  • Public Health (AREA)
  • General Health & Medical Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Water Supply & Treatment (AREA)
  • Environmental & Geological Engineering (AREA)
  • Structural Engineering (AREA)
  • Materials Engineering (AREA)
  • Civil Engineering (AREA)
  • Pharmacology & Pharmacy (AREA)
  • Epidemiology (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Pigments, Carbon Blacks, Or Wood Stains (AREA)
  • Paper (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

La presente invención se refiere a un proceso para la fabricación de un material que comprende carbonato de calcio, un material que comprende carbonato de calcio obtenido mediante un proceso así como también el uso del material que comprende carbonato de calcio para aplicaciones de relleno de papel y recubrimiento de papel, aplicaciones de papel de cigarrillo, para aplicaciones de plásticos o en pinturas, recubrimientos, adhesivos, reemplazo de dióxido de titanio, preferentemente en pinturas, selladores, alimentos, piensos, forrajes, hormigón, cemento, cosméticos, tratamiento del agua y/o aplicaciones de agricultura.
MX2017008892A 2015-01-07 2016-01-04 Proceso para obtener un ccm ultrafino con propiedades de dispersion luminosa elevadas y contenido de solidos elevado. MX2017008892A (es)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP15150367.9A EP3042878B1 (en) 2015-01-07 2015-01-07 Process to obtain an ultrafine GCC with high light scattering properties and high solid content
US201562103095P 2015-01-14 2015-01-14
PCT/EP2016/050006 WO2016110459A1 (en) 2015-01-07 2016-01-04 Process to obtain an ultrafine gcc with high light scattering properties and high solid content

Publications (1)

Publication Number Publication Date
MX2017008892A true MX2017008892A (es) 2017-10-25

Family

ID=52292781

Family Applications (1)

Application Number Title Priority Date Filing Date
MX2017008892A MX2017008892A (es) 2015-01-07 2016-01-04 Proceso para obtener un ccm ultrafino con propiedades de dispersion luminosa elevadas y contenido de solidos elevado.

Country Status (17)

Country Link
US (1) US10619049B2 (es)
EP (2) EP3042878B1 (es)
JP (1) JP6499764B2 (es)
KR (1) KR101964537B1 (es)
CN (1) CN107109078A (es)
AR (1) AR103358A1 (es)
AU (1) AU2016206099B2 (es)
BR (1) BR112017014566B1 (es)
CA (1) CA2971773C (es)
CL (1) CL2017001753A1 (es)
ES (1) ES2728380T3 (es)
HR (1) HRP20190885T1 (es)
MX (1) MX2017008892A (es)
RU (1) RU2663765C1 (es)
SI (1) SI3042878T1 (es)
TW (1) TWI627134B (es)
WO (1) WO2016110459A1 (es)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3318599A1 (en) * 2016-11-07 2018-05-09 Omya International AG Use of mono-substituted succinic anhydride
EP3354622A1 (en) * 2017-01-26 2018-08-01 Omya International AG Process for the preparation of fragmented natural calcium carbonate with a reduced content of impurities and products obtained thereof
EP3400810A1 (en) 2017-05-11 2018-11-14 Omya International AG Surface-reacted calcium carbonate in food
RU2652031C1 (ru) * 2017-07-11 2018-04-24 Юлия Алексеевна Щепочкина Способ подготовки полиакрилата натрия для введения в состав бетонной смеси (варианты)
EP3467050A1 (en) 2017-10-04 2019-04-10 Omya International AG Coating compositions comprising ground natural calcium carbonate (gcc)
CN107935012B (zh) * 2017-11-20 2020-03-31 广西河池华泰新材料科技有限公司 一种重质碳酸钙浆料脱水烘干方法
US11905189B2 (en) * 2018-05-10 2024-02-20 Chad Daloia Method of refining and recovering barium sulfate from contaminated water sources
EP3693339A1 (en) 2019-02-01 2020-08-12 Omya International AG Production of surface-reacted calcium salts by grinding induced conversion
FR3093011B1 (fr) * 2019-02-26 2021-02-19 Coatex Sas Réduction de l’hygroscopicité d’un matériau minéral
KR20210129697A (ko) * 2019-02-26 2021-10-28 옴야 인터내셔널 아게 분쇄된 탄산칼슘-포함 물질을 포함하는 수성 현탁액을 제조하는 방법
US20220135765A1 (en) * 2019-02-26 2022-05-05 Omya International Ag Process for preparing a surface treated calcium carbonate material
EP3725851A1 (en) 2019-04-16 2020-10-21 Omya International AG Process for preparing surface-reacted calcium carbonate
AR119243A1 (es) * 2019-07-08 2021-12-01 Omya Int Ag Composición seca cosmética y/o para el cuidado de la piel
WO2022073934A1 (en) 2020-10-05 2022-04-14 Omya International Ag Kit comprising surface-treated calcium carbonate and a peroxide agent for improving the mechanical properties of polyethylene/polypropylene compositions
WO2023187059A1 (en) 2022-03-31 2023-10-05 Omya International Ag Calcium carbonate for improving the mechanical properties of thermoplastic polymer compositions

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1599632A (en) * 1977-01-19 1981-10-07 English Clays Lovering Pochin Comminution of solid materials
US4793985A (en) 1982-08-23 1988-12-27 J. M. Huber Corporation Method of producing ultrafine ground calcium carbonate
US5558850A (en) 1990-07-27 1996-09-24 Ecc International Limited Precipitated calcium carbonate
US5533678A (en) 1993-01-19 1996-07-09 Pluess-Staufer Ag Method for the production of carbonates by wet grinding
GB2275876B (en) * 1993-03-12 1996-07-17 Ecc Int Ltd Grinding alkaline earth metal pigments
GB9520703D0 (en) 1995-10-10 1995-12-13 Ecc Int Ltd Paper coating pigments and their production and use
DE59704054D1 (de) 1996-03-13 2001-08-23 Omya Ag Oftringen Streichfarbe
GB9627002D0 (en) * 1996-12-27 1997-02-12 Ecc Int Ltd Dispersed aqueous suspensions
DK0894836T3 (da) 1997-07-28 2003-06-23 Omya Ag Opslemning, vælling, pulp, papirvådmasse (slurry), der indeholder et agglomereret carbonatholdigt pigment
JPH1150068A (ja) 1997-07-30 1999-02-23 Tonen Corp 燃料油添加剤及び該添加剤を含有する燃料油組成物
AU1869000A (en) * 1998-12-23 2000-07-31 Imerys Minerals Ltd. Production of concentrated carbonate suspensions
RU2172329C1 (ru) * 2000-11-10 2001-08-20 Открытое акционерное общество "Стройматериалы" Способ получения наполнителя на основе карбоната кальция
FR2818165B1 (fr) 2000-12-20 2003-10-31 Coatex Sas Agent d'aide au broyage de materiaux mineraux en suspension aqueuse. suspensions aqueuses obtenues et leurs utilisations
KR20170001758A (ko) * 2004-12-22 2017-01-04 솔베이(소시에떼아노님) 알칼리 토금속 카르보네이트의 내산성 입자
WO2006120694A1 (en) 2005-05-13 2006-11-16 Anil Kelkar Organic compound and process for inhibiting corrosion on metals
SI2143688T1 (sl) * 2008-07-07 2016-12-30 Omya International Ag Postopek za pripravo vodne suspenzije kalcijevega karbonata in pridobljena suspenzija, kakor tudi postopek za njeno uporabo
EP2194103A1 (en) * 2008-12-04 2010-06-09 Omya Development Ag Process for manufacturing calcium carbonate materials having a particle surface with improved adsorption properties
PL2292701T5 (pl) 2009-07-01 2017-12-29 Omya International Ag Sposób ulepszania nieprzezroczystości
DK2546410T3 (da) 2011-07-11 2014-02-03 Omya Int Ag Hydrofobiserede calciumcarbonatpartikler
PT2722368T (pt) 2012-10-16 2016-10-25 Omya Int Ag Processo de reação química controlada de uma superfície de material de enchimento sólido e aditivos para produzir umproduto de material de enchimento tratado de superfície
PT2770017E (pt) 2013-02-22 2015-11-30 Omya Int Ag Novo tratamento de superfície de materiais minerais brancos para aplicação em plásticos

Also Published As

Publication number Publication date
ES2728380T3 (es) 2019-10-24
WO2016110459A1 (en) 2016-07-14
AU2016206099A8 (en) 2018-08-02
US10619049B2 (en) 2020-04-14
JP6499764B2 (ja) 2019-04-10
CN107109078A (zh) 2017-08-29
EP3042878B1 (en) 2019-03-06
KR101964537B1 (ko) 2019-04-01
JP2018501185A (ja) 2018-01-18
EP3242856A1 (en) 2017-11-15
AR103358A1 (es) 2017-05-03
EP3042878A1 (en) 2016-07-13
RU2663765C1 (ru) 2018-08-09
BR112017014566B1 (pt) 2022-01-25
SI3042878T1 (sl) 2019-07-31
KR20170102176A (ko) 2017-09-07
TW201630815A (zh) 2016-09-01
HRP20190885T1 (hr) 2019-09-20
AU2016206099B2 (en) 2018-08-02
BR112017014566A2 (pt) 2018-03-27
CA2971773C (en) 2020-11-10
CL2017001753A1 (es) 2018-03-16
US20180009991A1 (en) 2018-01-11
AU2016206099A1 (en) 2017-08-24
CA2971773A1 (en) 2016-07-14
TWI627134B (zh) 2018-06-21

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