ES2616279T3 - Pigmentos de interferencia sobre la base de escamas de vidrio - Google Patents

Pigmentos de interferencia sobre la base de escamas de vidrio Download PDF

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ES2616279T3
ES2616279T3 ES06841250.1T ES06841250T ES2616279T3 ES 2616279 T3 ES2616279 T3 ES 2616279T3 ES 06841250 T ES06841250 T ES 06841250T ES 2616279 T3 ES2616279 T3 ES 2616279T3
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tio2
glass
refractive index
glass flakes
interference pigments
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Patrice Bujard
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BASF SE
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    • 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
    • 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
    • C09D11/00—Inks
    • C09D11/02—Printing inks
    • C09D11/03—Printing inks characterised by features other than the chemical nature of the binder
    • C09D11/037—Printing inks characterised by features other than the chemical nature of the binder characterised by the pigment
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
    • A61K8/0241—Containing particulates characterized by their shape and/or structure
    • A61K8/0254—Platelets; Flakes
    • A61K8/0258—Layered structure
    • A61K8/0262—Characterized by the central layer
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/19—Cosmetics or similar toiletry preparations characterised by the composition containing inorganic ingredients
    • A61K8/25—Silicon; Compounds thereof
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
    • A61Q1/00—Make-up preparations; Body powders; Preparations for removing make-up
    • A61Q1/02—Preparations containing skin colorants, e.g. pigments
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K9/00—Use of pretreated ingredients
    • C08K9/02—Ingredients treated with inorganic substances
    • 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
    • C09C1/0015—Pigments exhibiting interference colours, e.g. transparent platelets of appropriate thinness or flaky substrates, e.g. mica, bearing appropriate thin transparent coatings
    • 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
    • C09C1/0015—Pigments exhibiting interference colours, e.g. transparent platelets of appropriate thinness or flaky substrates, e.g. mica, bearing appropriate thin transparent coatings
    • C09C1/0021—Pigments exhibiting interference colours, e.g. transparent platelets of appropriate thinness or flaky substrates, e.g. mica, bearing appropriate thin transparent coatings comprising a core coated with only one layer having a high or low refractive index
    • 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
    • C09C1/0015—Pigments exhibiting interference colours, e.g. transparent platelets of appropriate thinness or flaky substrates, e.g. mica, bearing appropriate thin transparent coatings
    • C09C1/0024—Pigments exhibiting interference colours, e.g. transparent platelets of appropriate thinness or flaky substrates, e.g. mica, bearing appropriate thin transparent coatings comprising a stack of coating layers with alternating high and low refractive indices, wherein the first coating layer on the core surface has the high refractive index
    • 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
    • C09D11/00—Inks
    • C09D11/30—Inkjet printing inks
    • C09D11/40—Ink-sets specially adapted for multi-colour inkjet printing
    • 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
    • C09D201/00—Coating compositions based on unspecified macromolecular compounds
    • 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
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/36—Pearl essence, e.g. coatings containing platelet-like pigments for pearl lustre
    • 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
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/41—Organic pigments; Organic dyes
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
    • D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
    • D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
    • A61K2800/40—Chemical, physico-chemical or functional or structural properties of particular ingredients
    • A61K2800/41—Particular ingredients further characterized by their size
    • A61K2800/412—Microsized, i.e. having sizes between 0.1 and 100 microns
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
    • A61K2800/40—Chemical, physico-chemical or functional or structural properties of particular ingredients
    • A61K2800/42—Colour properties
    • A61K2800/43—Pigments; Dyes
    • A61K2800/436—Interference pigments, e.g. Iridescent, Pearlescent
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
    • A61K2800/40—Chemical, physico-chemical or functional or structural properties of particular ingredients
    • A61K2800/60—Particulates further characterized by their structure or composition
    • A61K2800/61—Surface treated
    • A61K2800/62—Coated
    • A61K2800/621—Coated by inorganic compounds
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
    • A61K2800/40—Chemical, physico-chemical or functional or structural properties of particular ingredients
    • A61K2800/60—Particulates further characterized by their structure or composition
    • A61K2800/65—Characterized by the composition of the particulate/core
    • A61K2800/651—The particulate/core comprising inorganic material
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/20—Particle morphology extending in two dimensions, e.g. plate-like
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/60—Particles characterised by their size
    • C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/12—Surface area
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C2200/00—Compositional and structural details of pigments exhibiting interference colours
    • C09C2200/10—Interference pigments characterized by the core material
    • C09C2200/102—Interference pigments characterized by the core material the core consisting of glass or silicate material like mica or clays, e.g. kaolin
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C2200/00—Compositional and structural details of pigments exhibiting interference colours
    • C09C2200/10—Interference pigments characterized by the core material
    • C09C2200/102—Interference pigments characterized by the core material the core consisting of glass or silicate material like mica or clays, e.g. kaolin
    • C09C2200/1025—Interference pigments characterized by the core material the core consisting of glass or silicate material like mica or clays, e.g. kaolin comprising at least one metal layer adjacent to core material, e.g. core-M or M-core-M
    • 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
    • C09C2200/00—Compositional and structural details of pigments exhibiting interference colours
    • C09C2200/30—Interference pigments characterised by the thickness of the core or layers thereon or by the total thickness of the final pigment particle
    • C09C2200/301—Thickness of the core
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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    • C09C2220/00—Methods of preparing the interference pigments
    • C09C2220/10—Wet methods, e.g. co-precipitation
    • C09C2220/106—Wet methods, e.g. co-precipitation comprising only a drying or calcination step of the finally coated pigment

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Veterinary Medicine (AREA)
  • Public Health (AREA)
  • General Health & Medical Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Epidemiology (AREA)
  • Birds (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Textile Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Pigments, Carbon Blacks, Or Wood Stains (AREA)
  • Surface Treatment Of Glass (AREA)
  • Paints Or Removers (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Silicon Compounds (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)

Abstract

Un pigmento, que comprende un sustrato de tipo placa de vidrio que tiene un espesor promedio < 1 μm, especialmente de 20 nm a 400 nm, y (a) un material dieléctrico, especialmente un óxido metálico, que tiene un elevado índice de refracción, es decir un índice de refracción mayor de 1,65; o (a) una capa metálica, especialmente una capa metálica semi-transparente y fina, en el que el sustrato de vidrio consiste en vidrio ECR que tiene > 0,1 % de TiO2 y en el que la composición del vidrio ECR es como se muestra a continuación: SiO2 (63-70 %), Al2O3 (3-6 %), CaO (4-7 %), MgO (1-4%), B2O3 (2-5 %), Na2O (9-12 %), K2O (0-3 %), TiO2 (>0,1-4 %), ZnO (1-5 %).

Description

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El óxido metálico de elevado índice de refracción es preferentemente TiO2 y/o óxido de hierro, y el óxido metálico de bajo índice de refracción es preferentemente SiO2. Las capas de TiO2 pueden estar en una modificación de rutilo o anastasa, en el que se prefiere la modificación de rutilo. Las capas de TiO2 también se pueden reducir por medios conocidos, por ejemplo amoníaco, hidrógeno, vapor de hidrocarburos o mezclas de los mismos, o polvos metálicos,
5 como se describe en los documentos EP-A-735,114, DE-A-3433657, DE-A-4125134, EP-A-332071, EP-A-707,050 o WO93/19131.
Para la finalidad de revestimiento, se suspenden las partículas de sustrato en agua y se añaden una o más sales metálicas hidrolizables a un pH apropiado para la hidrólisis, que se escoge de este modo para que los óxidos metálicos
o los hidratos de óxido metálico precipiten directamente sobre las partículas sin que tenga lugar precipitación
10 subsidiaria. El pH normalmente se mantiene constante por medición simultánea en una base. Los pigmentos se separan después, se lavan, secan y, cuando resulte apropiado, se calcinan, siendo posible optimizar la temperatura de calcinación con respecto al revestimiento en cuestión. Si se desea, una vez que se han aplicado los pigmentos individuales, éstos se pueden separar, secar y, cuando resulte apropiado, calcinar, y se pueden re-suspender de nuevo con el fin de precipitar las capas adicionales.
15 Las capas de óxido metálico también se pueden obtener, por ejemplo, en analogía con el método descrito en el documento DE-A-195 01 307, produciendo una capa de óxido metálico por medio de hidrólisis controlada de uno o más ésteres de ácido metálico, cuando resulte apropiado en presencia de un disolvente orgánico y un catalizador básico, por medio de un proceso de sol-gel. Los catalizadores básicos apropiados son, por ejemplo, aminas, tales como trietilamina, etilendiamina, tributilamina, dimetiletanolamina y metoxipropilamina. El disolvente orgánico es un
20 disolvente orgánico miscible con agua tal como un alcohol C1-4, especialmente isopropanol.
Los ésteres de ácido metálico apropiados se escogen entre alcoholatos de alquilo y arilo, carboxilatos y alcoholatos de alquilo con sustitución de radical arilo, radical alquilo o radical carboxilo o carboxilatos de vanadio, titanio, circonio, silicio, aluminio y boro. Se prefiere el uso de aluminato de triisopropilo, titanato de tetraisopropilo, circonato de tetraisopropilo, ortosilicato de tetraetilo y borato de trietilo. Además, se pueden usar acetilacetonatos y
25 acetoacetilacetonatos de los metales anteriormente mencionados. Los ejemplos preferidos de ese tipo de éster de ácido metálico son acetilacetonato de circonio, acetilacetonato de aluminio, acetilacetonato de titanio y acetoacetilacetonato de diisobutiloleílo o acetoacetilacetonato de diisopropiloleílo y mezclas de ésteres de ácido metálico, por ejemplo, Dynasil® (Hüls), un éster de ácido metálico de silicio/aluminio mixto.
Como óxido metálico que tiene un elevado índice de refracción, preferentemente se usa dióxido de titanio, usándose el
30 método descrito en el documento US-A-3.553.001, de acuerdo con una realización de la presente invención, para la aplicación de las capas de dióxido de titanio.
Se añade lentamente una disolución acuosa de sal de titanio a una suspensión del material objeto de revestimiento, habiéndose calentado dicha suspensión hasta aproximadamente 50-100 ºC, especialmente 70-80 ºC, y un valor de pH sustancialmente constante de aproximadamente 0,5 a 5, especialmente de aproximadamente 1,2 a 2,5, 35 manteniéndose de forma simultánea mediante medición en una base tal como, por ejemplo, una disolución acuosa de amoníaco o una disolución acuosa de hidróxido de metal alcalino. Tan pronto como se haya precipitado el espesor de capa deseado de TiO2 precipitado, se detiene la adición de la disolución de sal de titanio y base. La adición de un precursor de Al2O3 o MgO en las disoluciones de partida es una forma para mejorar la morfología de la capa de TiO2.
Este método, también denominado "método de valoración", se distingue por el hecho de que se evita un exceso de sal
40 de titanio. Esto se lograr alimentando para la hidrólisis, por unidad de tiempo, únicamente aquella cantidad que sea necesaria para el revestimiento uniforme con TiO2 hidratado, y que pueda captarse en la unidad de tiempo por parte de la superficie disponible de las partículas objeto de revestimiento. En principio, se genera la forma de anatasa de TiO2 sobre la superficie del pigmento de partida. No obstante, mediante adición de pequeñas cantidades de SnO2, es posible forzar la formación de la estructura de rutilo. Por ejemplo, como se describe en el documento WO 93/08237, se
45 puede depositar dióxido de estaño antes de la precipitación de dióxido de titanio y se puede calcinar el producto revestido con dióxido de titanio a una temperatura de 800 a 900 ºC.
Se puede reducir de forma adicional TiO2 por medio de procedimientos normales: Documentos US-B-4,948,631 (NH3, 750-850 °C), WO93/19131 (H2, > 900 °C) o DE-A-19843014 (agente de reducción sólido, tal como, por ejemplo, silicio, > 600 °C).
50 Cuando resulte apropiado, se puede aplicar una capa de SiO2 (protectora) sobre la parte superior de la capa de dióxido de titanio, para lo cual se puede usar el siguiente método: Se dosifica una disolución de vidrio soluble de sosa en una suspensión del material objeto de revestimiento, habiendo calentado la suspensión hasta aproximadamente 50-100 ºC, especialmente a 70-80 ºC. Se mantiene el pH de 4 a 10, preferentemente de 6,5 a 8,5 por medio de adición simultánea de ácido clorhídrico al 10 %. Tras la adición de la disolución de vidrio soluble, se lleva a cabo la agitación
55 durante 30 minutos.
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Claims (1)

  1. imagen1
ES06841250.1T 2005-06-22 2006-06-12 Pigmentos de interferencia sobre la base de escamas de vidrio Active ES2616279T3 (es)

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EP05105527 2005-06-22
EP05105527 2005-06-22
PCT/EP2006/063077 WO2007054379A1 (en) 2005-06-22 2006-06-12 Interference pigments on the basis of glass flakes

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US11091658B2 (en) 2021-08-17
CN101203574A (zh) 2008-06-18
US20190023915A1 (en) 2019-01-24
JP2008546880A (ja) 2008-12-25
JP5234960B2 (ja) 2013-07-10
CN101203574B (zh) 2012-09-05
EP1904586B1 (en) 2016-11-23
US20090311209A1 (en) 2009-12-17
WO2007054379A1 (en) 2007-05-18
EP1904586A1 (en) 2008-04-02
KR101344692B1 (ko) 2013-12-26
KR20080017485A (ko) 2008-02-26

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