US20080295737A1 - White Pigment Reflecting Ir Radiation, Production and Use Thereof - Google Patents

White Pigment Reflecting Ir Radiation, Production and Use Thereof Download PDF

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US20080295737A1
US20080295737A1 US12/158,133 US15813306A US2008295737A1 US 20080295737 A1 US20080295737 A1 US 20080295737A1 US 15813306 A US15813306 A US 15813306A US 2008295737 A1 US2008295737 A1 US 2008295737A1
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reflecting
pigment
pigments
core
white
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Inventor
Frank Henglein
Christian Schramm
Ulrich Schmidt
Harald Weiss
Jasmin Bleisteiner
Michael Gruner
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Eckart GmbH
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Eckart GmbH
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Publication of US20080295737A1 publication Critical patent/US20080295737A1/en
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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
    • 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
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
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    • 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
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    • 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
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    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/62—Metallic pigments or fillers
    • C09C1/64—Aluminium
    • C09C1/642—Aluminium treated with inorganic compounds
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    • 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
    • C09C1/62—Metallic pigments or fillers
    • C09C1/64—Aluminium
    • C09C1/648—Aluminium treated with inorganic and organic, e.g. polymeric, compounds
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    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
    • C09C3/06—Treatment with inorganic compounds
    • C09C3/063—Coating
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    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
    • C09C3/10—Treatment with macromolecular organic compounds
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    • 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
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    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/004—Reflecting paints; Signal paints
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    • 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
    • C09D7/66—Additives characterised by particle size
    • C09D7/69—Particle size larger than 1000 nm
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    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
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    • C01P2002/80—Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70
    • C01P2002/82—Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70 by IR- or Raman-data
    • 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
    • C01P2004/62—Submicrometer sized, i.e. from 0.1-1 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
    • C01P2006/60—Optical properties, e.g. expressed in CIELAB-values
    • C01P2006/62—L* (lightness axis)
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/08—Metals
    • 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
    • C09C2200/00—Compositional and structural details of pigments exhibiting interference colours
    • C09C2200/10—Interference pigments characterized by the core material
    • C09C2200/1054—Interference pigments characterized by the core material the core consisting of a metal
    • C09C2200/1058—Interference pigments characterized by the core material the core consisting of a metal comprising a protective coating on the metallic layer
    • 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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    • C09C2200/00—Compositional and structural details of pigments exhibiting interference colours
    • C09C2200/50—Interference pigments comprising a layer or a core consisting of or comprising discrete particles, e.g. nanometric or submicrometer-sized particles
    • C09C2200/505—Inorganic particles, e.g. oxides, nitrides or carbides
    • 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
    • C09C2210/00—Special effects or uses of interference pigments
    • C09C2210/10—Optical properties in the IR-range, e.g. camouflage pigments
    • 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
    • C09C2220/00—Methods of preparing the interference pigments
    • C09C2220/10—Wet methods, e.g. co-precipitation

Definitions

  • the invention relates to largely white pigments which reflect IR radiation and also to their production and also to their use.
  • Wall paints are typically pigmented with white pigments such as titanium dioxide or barium sulfate.
  • white pigments such as titanium dioxide or barium sulfate.
  • colored emulsion paints are obtained by tinting with corresponding color pigments.
  • the use of, say, aluminum pigments as IR-reflecting pigments has the disadvantage that the wall paint acquires a metallic appearance. In the majority of cases, however, this is unwanted. Metallic pigments in a wall paint, furthermore, significantly show up the unevennesses in the substrate. In addition, depending on concentration and particle size, the use of aluminum pigments has the disadvantageous effect of a graying of the emulsion paint.
  • the majority of emulsion paints are white, and white emulsion paints are also used as a basis for tinting with color pigments in order to produce colored emulsion paints.
  • DE 42 11 560 A1 discloses a coating of substrates, which among others may be metal flakes or mica pigments, with white pigments having a particle size below 1 ⁇ m.
  • the pigments are applied to the substrate merely by means of spray drying, without any further coating, and therefore possess deficient adhesion to said substrate.
  • DE 100 10 538 A1 discloses a dirt-repelling coating material which discloses a complex composition, which as well as a multiplicity of components and particles may also include platelet-shaped particles, such as aluminum pigments.
  • One disadvantage of the coating material known from DE 100 10 538 A1 is that the metal pigments can corrode, and another is that the coating material has a metallic appearance or metallic effect.
  • DE 195 01 307 A1 discloses colored aluminum pigments wherein color pigments are incorporated in a metal oxide matrix which is produced by a sol-gel process. The resulting aluminum pigments are colored and metallically lustrous.
  • U.S. Pat. No. 5,037,475 likewise discloses colored aluminum pigments coated with color pigments.
  • the attachment of the color pigments is on the one hand via a thermally polymerized, unsaturated, polyfunctional carboxylic acid and on the other hand via a plastic coating.
  • a disadvantage, again, is that the colored aluminum pigments thus produced have a distinctly metallic appearance.
  • WO 91/04293 discloses colored and metallically lustrous metal pigments.
  • WO 96/23337 discloses a coating material, featuring two particles—in one case platelet-shaped metal pigments and in the other case white pigments—which have a very high absorption in the near infrared range.
  • the white pigments may also have been applied to the metal pigments. Not disclosed, however, is how the white pigments are fixed on the metal pigments.
  • WO 2005/007754 discloses colored pigments which have an infrared-reflecting core with a thickness below 0.2 ⁇ m. In this case no white pigments are disclosed, and nor is it disclosed how they are fixed on the metal pigments.
  • DE 40 35 062 A1 discloses an IR-reflecting substrate coated with a varnish layer which may comprise white, gray, black or chromatic pigments. Not disclosed herein are emulsion paints which can be applied to walls in the habitual way.
  • IR-reflecting pigments preferably metal pigments, which have a white appearance and in which any metallic effect is suppressed.
  • a further object is to provide IR-reflecting pigments, preferably metal pigments, which, when used in an application medium, such as a paint or a varnish, for example, are not markedly visible to the human eye and do not lead to any substantial graying of the application medium.
  • the pigment ought to be amenable to use in emulsion paints, not only in an interior wall paint but also in a masonry paint.
  • the object on which the invention is based is achieved by means of a pigment which reflects IR radiation, comprising an IR-reflecting core, the IR-reflecting core being provided with a substantially enveloping coating which is substantially transparent to IR radiation, and the IR-reflecting pigment being substantially white.
  • the object is further achieved by means of a process for producing an IR-reflecting pigment of any one of claims 1 to 23 , where a coating which is substantially transparent to IR radiation, together with white pigments and/or with particlelike coating outgrowths that scatter visible light, is applied to an IR-reflecting core.
  • the object on which the invention is based is further achieved through the use of the pigment of the invention in inks, paints, varnishes, printing inks, security-printing inks, and cosmetics.
  • the object is also achieved by means of a coating composition which comprises a pigment of the invention according to any one of claims 1 to 23 .
  • the object is further achieved by an article which is coated with a pigment of the invention according to any one of claims 1 to 23 or with a coating composition of the invention according to either of claims 30 and 31 .
  • the article may be, for example, a coated wall material or ceiling material, a coated building material, such as façade material, for example, etc.
  • the inventors have surprisingly found that it is possible to provide a pigment which has an IR-reflecting core and at the same time appears substantially white to the human eye.
  • an IR-reflecting core such as a substrate having a metallic surface which reflects IR radiation extremely effectively, for example, can be coated in such a way that, on the one hand, the IR reflection capacity is not substantially impaired and, on the other hand, the pigment appears largely white and nonmetallic to the human eye.
  • the pigment of the invention can therefore be used in white application media, such as inks, paints, varnishes or cosmetics, for example, without there being any distinctly marked graying or any metallic luster or any strong sparkle effect on the part of the application medium.
  • the pigment of the invention is suitable more particularly for use in white emulsion paints which are typically used for painting interior room walls. It will be appreciated that emulsion paints of this kind comprising the pigments of the invention can also be tinted in a typical way through addition of further colorants.
  • an IR-reflecting core is given a substantially uniform coating of pigmentlike particles which are opaque in the optical wavelength range and at the same time are largely IR-transparent.
  • a core for the purposes of the invention is a particulate, preferably spherical or platelet-shaped, substrate. With very particular preference the substrate possesses a platelet-shaped form, since this geometric morphological form combines the greatest IR reflection with the least amount of material, i.e., a relatively low level of pigmentation.
  • the coating is preferably composed of the substantially IR-transparent pigment particles (white pigments) on the one hand and of a matrix material on the other hand.
  • the substantially IR-transparent pigment particles may be fixed on the surface of the IR-reflecting core, by being incorporated in and/or on an optically transparent matrix, for example.
  • This matrix provides preferably uniform envelopment of the core.
  • This preferably enveloping matrix also protects the core against the corrosive effect of water or atmospheric gases.
  • a substantially enveloping coating for the purposes of the invention means that the IR-reflecting core is enveloped by the coating in such a way that, to a viewer, the core does not produce any perceptible lustrous impression. Furthermore, the degree of envelopment is so large that, in the case of a corrosion-susceptible metallic IR-reflecting core, the incidence of corrosion is suppressed or prevented.
  • the pigment of the invention overall acquires a largely white appearance.
  • the optical effect originating from the IR-reflecting core is largely suppressed. Owing to the large IR transparency of the pigmentlike particles, surprisingly, the IR reflection capacity of the core is not—or not substantially—adversely affected.
  • optical properties or “optical effect” are always those properties of the IR-reflecting pigments that are visible to the human eye. Physically, these properties are determined substantially by the optical properties in the wavelength range from approximately 400 to approximately 800 nm.
  • the white, optically opaque and IR-transparent pigmentlike particles are white pigments having an average primary particle size of preferably 180 to 400 nm, more preferably of 250 to 350 nm, and more preferably still of 270 to 330 nm.
  • pigments of this kind possess the greatest scattering cross section for electromagnetic wavelengths in the optical range from 400 to 800 nm. Both smaller and larger white pigments have far lower scattering properties. The lowest scattering is produced, for example, by nanoparticles having a primary particle size below from 30 to 40 nm, which are almost completely transparent.
  • the particles preferably have a particle size with the greatest scattering cross section has the effect that they appear substantially white and the optical light almost do not reach the surface of the IR-reflecting core. Consequently the optical effect of the core, the metallic effect for example, is substantially suppressed and the overall pigment appears substantially white.
  • the white pigments may be selected, for example, from the group consisting of titanium dioxide, zinc oxide, magnesium oxide, zinc sulfide, calcium fluoride, lithium fluoride, sodium fluoride, potassium fluoride, calcium carbonate, lithopones, magnesium carbonate, barium sulfate, barium titanate, barium ferrite, and mixtures thereof.
  • the white pigment is substantially transparent, preferably transparent, to IR radiation. The particle size, and also the amount of white pigment applied to the IR-reflecting core, are adjusted as a function of the white pigment used.
  • TiO 2 in the rutile or anatase modification Preference is given to using TiO 2 in the rutile or anatase modification, barium sulfate, zinc oxide and/or zinc sulfide, with particular preference being given to TiO 2 and ZnO on account of their universal availability in all sizes.
  • TiO 2 in the rutile form has proven very suitable.
  • a coating which is substantially transparent to IR radiation is meant, for the purposes of the invention, that only a small fraction of IR radiation is absorbed by the coating and/or the white pigments. Together with the IR-reflecting properties of the core, this leads to a high IR reflectance.
  • the IR reflectance ⁇ IR as a function of the temperature T can be calculated from the spectral reflectance R( ⁇ ) by integration over all wavelengths, with the Planck function i(T) as a weighting function:
  • ⁇ IR ⁇ ( T ) ⁇ 1.4 35 ⁇ R ⁇ ( ⁇ ) * i ⁇ ( T ) * ⁇ ⁇ ⁇ ⁇ 1.4 35 ⁇ i ⁇ ( T ) * ⁇ ⁇ ⁇ ( 1 )
  • the Planck function i(T) indicates how much a blackbody would emit at a given temperature T.
  • the relevant spectral range for room temperature corresponds in good approximation to the wavelength range from 1.4 to 35 ⁇ m.
  • IR-reflecting pigments of the invention in the wavelength range from 2.5 to 25 ⁇ m and at a calculated temperature of 300 K, have an IR reflectance of preferably more than 50%. With further preference the IR reflectance is at least 60% and with even further preference at least 70%. Very preferably the IR reflectance is at least 80%, and most preferably it is at least 85%.
  • the spectral IR reflectivity of the pigments of the invention can be determined by means of a diffuse reflection measurement in a KBr powder bed, as follows. First of all KBr powder is comminuted in a mortar. Then pigment is added to the KBr powder to a concentration of 1.5% by weight, and the constituents are combined homogeneously with one another. A tablet-shaped sample chamber (diameter: about 0.8 cm, depth: about 2.2 mm) is filled with the pigment/KBr mixture, which is tamped down. Subsequently the diffuse reflection is measured in a wavelength range from 2.5 to 25 ⁇ m. This is done using, as a measuring unit, the Selector (from Specac).
  • This instrument measures the diffuse IR reflection in a quarter-sphere geometry.
  • the IR instrument used is an Avatac 360 spectrometer from Thermo; the detector is a DTGS detector.
  • the detector is a DTGS detector.
  • a pure KBr powder is measured as the background spectrum, and the spectrum of the pigmented KBr is compared against it. The procedure was repeated three times and the average value of the measurements was taken.
  • the above-described IR reflectance of a coated pigment of the invention can be related in percent terms to the IR reflectance of the uncoated IR-reflecting core (1.5% by weight concentration).
  • This ratio is referred to in the context of this invention as “IR reflectance, coating”.
  • the ratio is preferably above 65%, more preferably above 70%, and with particular preference above 80%. With further preference this ratio is above 85% and even more preferably above 90%. As an upper limit the ratio is 99%.
  • a substantially or largely transparent enveloping coating refers to those coatings for which the IR-reflecting pigment of the invention has the above-specified properties in terms of its IR reflectance.
  • the substantially or largely transparent enveloping coating preferably features the white pigments which give rise to or improve the white appearance.
  • the white pigments used may also have been surface-treated and may have been coated, for example, with metal oxides.
  • TiO 2 pigments it is possible for TiO 2 pigments to have coatings of, for example, SiO 2 , Al 2 O 3 and/or manganese oxides and/or cerium oxides, in order to suppress the photoactivity of the TiO 2 pigments.
  • the photoactivity of the TiO 2 pigments is suppressed by the enveloping matrix itself by which the TiO 2 pigments are fixed to the surface of the IR-reflecting core.
  • the amount of white pigment used is dependent on the type and size of the pigment and in particular on the specific surface area of the IR-reflecting core.
  • the specific surface area of the IR-reflecting core is the surface area of the IR-reflecting core per unit weight.
  • the specific surface area of the IR-reflecting core is determined by the known BET method.
  • the IR-reflecting pigments of the invention preferably have white pigments in an amount from 20% to 80% by weight, more preferably from 35% to 70% by weight, and with particular preference from 40% to 60% by weight, based in each case on the weight of the total IR-reflecting pigment.
  • white pigments in an amount from 20% to 80% by weight, more preferably from 35% to 70% by weight, and with particular preference from 40% to 60% by weight, based in each case on the weight of the total IR-reflecting pigment.
  • the whiteness of the IR-reflecting pigments may be too low.
  • that emulsion paint In order to obtain effective IR reflection with the latter pigments in, say, an emulsion paint, that emulsion paint must have a correspondingly high level of pigmentation.
  • High pigmentation i.e., a high level of pigment of the invention in the application medium, leads on the one hand to high production costs. On the other hand it may also result in overpigmentation and hence in poor performance properties on the part of these emulsion paints.
  • IR-reflecting cores used are preferably metal powders and/or platelet-shaped metal pigments and/or suitable pearlescent pigments. Particular preference is given in this context to platelet-shaped metal pigments, since on account of their shaping and their optical properties, in the case of preferably plane-parallel orientation in the application medium, they exhibit the highest IR reflection.
  • the metal pigments are opaque both to optical light and to IR radiation. Even on nonplanar substrates, such as woodchip wallpapers, for example, platelet-shaped metal pigments bring about the most effective directed and/or diffuse reflection of incident IR radiation.
  • Platelet-shaped metal pigments or metal powders employed are preferably aluminum, copper, zinc, titanium, iron, silver and/or alloys of these metals. Particular preference is given to aluminum and to alloys of aluminum, on account of their extremely high IR reflection and the ready availability of these metal pigments.
  • the platelet-shaped metal pigments are also referred to in accordance with the invention as metallic effect pigments.
  • the dimensions of the length and width of the platelet-shaped pigments are preferably between 3 and 200 ⁇ m, more preferably between 12 and 90 ⁇ m, more preferably still between 20 and 75 ⁇ m, and with particular preference between 40 and 70 ⁇ m.
  • the average thickness of the platelet-shaped pigments is preferably between 0.04 and 4 ⁇ m, more preferably between 0.1 and 3 ⁇ m, and with particular preference between 0.3 and 2 ⁇ m.
  • the platelet-shaped pigments preferably metallic effect pigments, preferably have specific surface areas of about 0.2 to about 15 m 2 /g.
  • Metal pigments or metallic effect pigments with a length or width below 3 ⁇ m exhibit excessive scattering in the optical range and therefore appear too gray even after coloring with a white pigment.
  • pigments of this size no longer provide optimum reflection of the IR radiation, since in this case the pigments are already smaller than the wavelength of the IR light to be reflected.
  • these metal pigments or metallic effect pigments can no longer be fully coated with white pigments or can no longer tie the white pigments correspondingly into a coating.
  • the platelet-shaped metal pigments may be present in a prepassivated form.
  • examples of such are SiO 2 -coated aluminum pigments (Hydrolan®, PCX or PCS®, Eckart) or chromated aluminum pigments (Hydrolux®, Eckart).
  • substrates prestabilized in this way maximizes the stabilities in terms of the gassing stability in an aqueous paint, more particularly an emulsion paint, and also, possibly, the corrosion stabilities in the exterior sector.
  • the platelet-shaped pigments preferably metal pigments, possess lengthwise dimensions of 5 to 12 ⁇ m. Pigments of this kind are used predominantly as white, opaque pigments. In this case relatively small metal pigments are used as the core in order to obtain high opacity.
  • the amount of white pigment applied to the preferably platelet-shaped metal pigment, per 1 m 2 surface area of the IR-reflecting metal core is preferably 0.3 to 10 g, more preferably 0.5 to 7 g, with further, particular preference 1 to 3 g, and with particular preference 1.5 to 2.5 g.
  • the coating of the preferably platelet-shaped metal pigment with the white pigment may be too low to impart a satisfactory white effect.
  • the white effect is practically saturated and the fraction of the IR-reflecting core as a proportion of the total pigment may be too low, with the consequence that a pigment of the invention of this kind may no longer exhibit sufficient IR reflectivity.
  • IR-reflecting cores it is additionally possible to use metal powders.
  • Suitable powders preferably have an approximately spherical morphology with an average diameter of preferably 8 to 1000 ⁇ m, more preferably 10 to 500 ⁇ m, and with particular preference 20 to 300 ⁇ m.
  • Irregularly shaped metal particles can also be used as IR-reflecting cores.
  • pearlescent pigments As IR-reflecting cores it is also possible to use pearlescent pigments. These pearlescent pigments preferably have a low-refractive-index core, such as mica, glass, SiO 2 or Al 2 O 3 flakes, coated with high-index oxides such as TiO 2 and/or Fe 2 O 3 . Examples of SiO 2 flakes coated with TiO 2 and/or Fe 2 O 3 are known under the Colorstream® name, and examples of corresponding Al 2 O 3 flakes under the Xirallic® name, and are both produced by Merck, Darmstadt, Germany. Given appropriate optical thicknesses of the high-index coat, the interference conditions result in large reflection of the IR radiation. The suitable optical thicknesses are set as a function of the refractive indices of the high-index oxide.
  • the pigments of the invention preferably possess high reflection in the IR range from 4 to 25 ⁇ m, more preferably from 5 to 15 ⁇ m, and with further preference from 8 to 12 ⁇ m. It has emerged that an optimum feel-good ambience in the interior of a room is generated if there are high reflections, preferably even reflection maxima, within the aforementioned ranges, since in that case the pigments of the invention effect optimum reflection of a person's IR radiation. Accordingly the pigments of the invention are suitable more particularly for use for wall paints which are applied in interior rooms.
  • the pigments of the invention make it possible to save energy, which signifies a great advance from both an environmental and an economic standpoint, in view of increasingly scarce energy resources and continually increasing energy costs.
  • pearlescent pigments which can be used as IR-reflecting cores are the pearlescent pigments produced by Merck, Darmstadt, Germany and sold under the brand names Solarflair® or Minatec®.
  • platelet-shaped cores as an IR-reflecting component in the pigments of the invention optimizes IR reflection in relation to the amount of IR-reflecting material used.
  • a very great improvement is obtained, on the one hand, in the opacity properties of pigments, preferably of metal pigments, as compared, for example, with spherical pigments such as metal beads, for example.
  • the reflectivity of platelet-shaped pigments, preferably metal pigments is greater by virtue of the greater reflection area.
  • effect pigments examples being metallic effect pigments or pearlescent pigments, since these pigments, on account of their platelet form, are particularly suitable in respect of opacity and reflectivity in the context of the present invention.
  • Effect pigments typically have an optical appearance which is dependent on the angle of incidence and/or viewing.
  • the optical effects may encompass changes in lightness in the case of metal pigments, which are also referred to as “flop”, and color changes in the case of pearlescent effect pigments, which are also referred to as “color flops”.
  • a typical feature of application media, such as inks, paints or varnishes, which comprise effect pigments are their high gloss values.
  • Metal powders in contrast, in application media such as inks, paints or varnishes, always give rise in optical terms to severe graying, which goes hand in hand with low lightness.
  • a largely white IR-reflecting pigment of the invention that has no marked metallic effect to the human eye or has a color effect which is different from the color white, preferably meets the following criteria:
  • the parameters of gloss, chroma C*, flopindex, and the lightness L*, measured in each case at a constant incident angle of 45° are preferably situated within defined ranges of values. Even the sparkle effect that frequently occurs in the case of effect pigments is largely suppressed. This sparkle effect, however, cannot be measured by colorimetry and can therefore only be assessed visually.
  • the pigments of the invention are incorporated into an otherwise unpigmented conventional varnish based on a polyester/CAB system (binders: 22% by weight CAB 381-2 and 9% by weight CAB 551-0.2, both from Eastman, and 13% by weight Viacryl SC 303, from Surface Specialties. No other pigments or matting agents are added to this varnish, referred to below as the “test varnish”, since they would influence the parameters it is intended to determine, more particularly gloss and chroma.
  • the level of pigmentation chosen is 10% by weight, and the pigment-containing varnish is knife-coated on a black substrate.
  • the coating knife depth is 50 ⁇ m, and in the case of very coarse pigments is 100 ⁇ m.
  • These knife drawdowns are used to determine the chroma, lightness values, and flop value in the context of the CieLab color system. Measurement is carried out using a multiangle colorimeter, an example being the M 682 from X-Rite, in accordance with manufacturer's indications, with a constant incident angle of 45° and with different viewing angles relative to the specular angle, and the L* and C* values are ascertained. Relevant more particularly are the viewing angles at 15°, 25°, 45°, and 110°.
  • the value to be employed is C* 25 °.
  • the C* 25 ° value of the knife drawdowns of the pigments of the invention is preferably within a range from 0.0 to 2.5, more preferably from 0.1 to 1.0. Values of this kind are achieved only by virtually colorless pigments.
  • the value at 45° is employed.
  • effect pigments are frequently characterized by values close to the specular angle, i.e., at 15° or 20°.
  • the pigments of the invention exhibit a largely angle-independent lightness, i.e., they have no significant lightness flop. A more effective differentiation from pure metal pigments or metal powders is therefore achieved in the case of median values.
  • the L* 45 ° values of the pigments of the invention are preferably 50 to 90 units, more preferably 55 to 80 units, and more preferably still 60 to 75 units.
  • the lightness flop is specified by DuPont in accordance with the following formula (A. B. J. Rodriguez, JOCCA , (1992(4)) pp. 150-153):
  • the flop index shows the characteristic lightness flop more particularly of metallic effect pigments, and is less applicable to pearlescent pigments or metal powders.
  • the pigments of the invention possess a lightness flop of 0 to 3, preferably of 0.1 to 2, and more preferably of 0.15 to 1.0.
  • effect pigments One characteristic more particularly of effect pigments is the high gloss of the ink, paint or varnish coating comprising the effect pigments. Since the pigments of the invention no longer exhibit these characteristic optical gloss properties of effect pigments, the drawdowns possess very low gloss values.
  • the criterion employed here is the gloss at 60°, which was measured using a Trigloss instrument from Byk-Gardner, Germany, in accordance with the manufacturer's instructions.
  • the pigments of the invention possess a gloss of 1 to 12, preferably of 1.5 to 10, units. With effect pigments the gloss is typically situated within a range from approximately 30 to 160.
  • a further criterion for the largely white appearance of the pigment of the invention can be determined on the basis of its appearance in a commercially available white emulsion paint.
  • a comparison is made between the pigments of the invention and the IR-reflecting pigments with no coating and/or with no white pigment coating.
  • the lightness of correspondingly pigmented emulsion paints is measured in diffuse reflection.
  • the level of pigmentation of the IR-reflected core in this case is 10% by weight, based on the total emulsion paint. Subsequently the difference of the corresponding lightnesses is formed:
  • This difference ought preferably to be greater than 1.5 units, preferably greater than 3 units, and more preferably greater than 7 units.
  • the coating substantially transparent to IR radiation that largely envelopes not only the core but also the white pigments constitutes a matrix which is largely colorless from an optical standpoint. It comprises or consists preferably of metal oxides and/or organic polymers.
  • the white pigments may also be applied on the enveloping coating or matrix.
  • the matrix is preferably largely colorless, in order not to adversely affect the white effect produced by the applied or incorporated white pigments.
  • the metal oxides and/or organic polymers have no substantial inherent coloration that cannot be masked by the white effect generated by the white pigments.
  • the largely colorless matrix material is preferably a metal oxide, since in this way the core can be protected very well from corrosion.
  • the metal oxide to be used for the matrix material, and the amount of that oxide, are selected more particularly under the consideration that the pigment of the invention should absorb IR radiation to as small an extent as possible. Any IR absorption on the part of the pigments of the invention results in reduced IR reflection and hence weakens the desired effect of the pigments of the invention.
  • the matrix material brings about adhesion of the white pigments on the IR-reflecting core, and so, even after dispersion into the emulsion paint, the white pigments remain largely adhering to the IR-reflecting core. It is only this reliable attachment that allows the optical phenomena typical of effect pigments to be suppressed, and permits the largely white appearance.
  • metal oxides examples include titanium dioxide, silicon dioxide, aluminum oxide/hydroxide, boron oxide/hydroxide, zirconium oxide or mixtures thereof. Silicon dioxide is particularly preferred.
  • organic polymers it is preferred to use those which are also employed as binders in varnishes, emulsion paints or printing inks.
  • examples thereof are polyurethanes, polyesters, polyacrylates and/or polymethacrylates. It has emerged that the effect pigments of the invention can be incorporated very effectively into binders if the organic coating and the binder are very similar to one another or identical.
  • the optically largely colorless matrix is present preferably in a fraction of 4% to 40% by weight, based on the weight of the total pigment.
  • the fraction is preferably 5% to 20% and more preferably 6% to 15% by weight.
  • the requisite corrosion stability which requires very substantially complete envelopment of the cores with the matrix, is not sufficiently provided at these low quantities.
  • amounts above 40% by weight it may be the case that not only the IR reflection but also the whiteness of the pigments are too low. It may be the case, furthermore, that the IR absorption undergoes an unfavorable increase as a result of the matrix material.
  • the IR-reflecting core is composed of aluminum and the optically largely colorless matrix is composed of SiO 2 .
  • the white pigment is TiO 2 ZnS and/or ZnO, which preferably have an average primary particle size of 250 to 370 nm and with particular preference of 250 to 320 nm.
  • Aluminum possesses the highest IR reflection and is very readily available commercially.
  • SiO 2 is outstandingly suitable for providing the aluminum with corrosion stabilization, and TiO 2 , on account of its high refractive index, is a very good white pigment, and is likewise very readily available commercially.
  • ZnS particles or ZnO particles more particularly having a primary particle size in the range from 250 to 370 nm and with particular preference from 250 to 320 nm, absorb IR radiation hardly at all and are therefore especially suitable in the context of the present invention.
  • the pigments of the invention have an organic surface modification.
  • the pigments of the invention are preferably modified with leafing promoter agents.
  • the leafing promoter agents produce floating of the pigments of the invention on the surface of the application medium, an ink or paint for example, preferably an emulsion paint, a varnish or a cosmetic.
  • the pigments of the invention are preferably surface-modified with long-chain saturated fatty acids such as stearic acid, for example, or palmitic acid or with long-chain alkylsilanes having 8 to 30 C atoms, preferably 12 to 24 C atoms, or with long-chain phosphoric acids or phosphonic acids or their esters and/or with long-chain amines.
  • long-chain saturated fatty acids such as stearic acid, for example, or palmitic acid or with long-chain alkylsilanes having 8 to 30 C atoms, preferably 12 to 24 C atoms, or with long-chain phosphoric acids or phosphonic acids or their esters and/or with long-chain amines.
  • the pigmentlike particles are composed not of individual, commercially available white pigments but instead of particlelike outgrowths of a coating material having a refractive index >2.0.
  • the coating may be composed first of a smooth layer of this high-index material, but which then, in terms of its morphology, increasingly adopts a particulate form on the side of the coating facing away from the IR-reflecting core.
  • Forms of this kind may be represented, for example, in a kind of “cauliflower structure” if the pigments are investigated by scanning-electron methods. Preference is given here to layers and particlelike coating outgrowths of TiO 2 .
  • the pigments of the invention can be produced by applying a coating which is substantially transparent to IR radiation, together with white pigments and/or particlelike coating outgrowths that scatter visible light, to an IR-reflecting core.
  • the coating preferably envelopes the IR-reflecting core substantially completely, with further preference completely.
  • the white pigments which are substantially transparent to IR radiation and/or particlelike coating outgrowths that scatter visible light are applied in and/or on the coating.
  • the white pigments that are substantially transparent to IR radiation are precipitated envelopingly around the core together with metal oxide, using wet-chemical sol-gel processes, with the consequence that the white pigments are substantially imbedded in the metal oxide layer.
  • One preferred variant of the process encompasses the following steps:
  • the pigment of the invention i.e., the platelet-shaped IR-reflecting core coated with white pigments and metal oxide, can be separated from unreacted starting materials and from the solvent. After that it is possible for drying and, optionally, size classification to take place.
  • tetraalkoxysilanes such as tetramethoxysilane or tetraethoxysilane, in order to effect precipitation of an SiO 2 layer, with white pigments preferably imbedded in it, onto and preferably enveloping the core.
  • organic solvents it is preferred to use water-miscible solvents. Particular preference is given to using alcohols such as, for example, methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol or tert-butanol.
  • alcohols such as, for example, methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol or tert-butanol.
  • the amount of water ought preferably to be between 1.5 times and 30 times the amount required by stoichiometry for the sol-gel reaction.
  • the amount of water is preferably between 2 times and 10 times the stoichiometrically required amount.
  • the reaction temperature during the sol-gel reaction is preferably between 40° C. and the boiling temperature of the solvent used.
  • Acids used are preferably organic acids such as acetic acid, oxalic acid, formic acid, etc., for example.
  • Bases used are preferably amines. Examples thereof are as follows: ammonia, hydrazine, methylamine, ethylamine, triethanolamine, dimethylamine, diethylamine, methylethylamine, trimethylamine, triethylamine, ethylenediamine, trimethylenediamine, tetramethylenediamine, 1-propylamine, 2-propylamine, 1-butylamine, 2-butylamine, 1-propylmethylamine, 2-propylmethylamine, 1-butylmethylamine, 2-butyl-methylamine, 1-propylethylamine, 2-propylethylamine, 1-butylethylamine, 2-butylethylamine, piperazine and/or pyridine.
  • the white pigments can be comminuted mechanically, preferably prior to the addition to the coating suspension, in order to have as many primary particles present as possible. This may take place, as is typical, in an organic solvent, where appropriate with the addition of suitable dispersing additives and/or binders. The comminution may take place in the typical assemblies, such as a triple-roll mill, co-ball mill, toothed-wheel dispersing mill, etc, for example.
  • the pigments of the invention are produced by a spray-drying process.
  • a dispersion comprising a highly volatile, preferably organic, solvent, IR-reflecting cores, IR-transparent white pigments with an average size of preferably 180 to 400 nm, and an organic, preferably film-forming, binder together is sprayed and is dried in the course of the spraying.
  • the spray drying is carried out preferably in an agitated atmosphere, such as in a fluidized bed, for example, in order to prevent agglomeration.
  • the cores are coated uniformly with the organic, preferably film-forming, binder and with the white pigments.
  • the organic, preferably film-forming, binder can be cured. This can be done preferably likewise in the spray-drying apparatus, by means, for example, of the temperature of the feed gas being above the curing temperature of the binder.
  • the IR-reflecting, preferably platelet-shaped, pigment of the invention can be obtained by coating the IR-reflecting cores with a matrix comprising suitable starting compounds and white pigments in a fluidized-bed process.
  • the IR-reflecting, preferably platelet-shaped, pigments of the invention are used preferably in inks, paints, varnishes, printing inks, security-printing inks, and cosmetics.
  • the IR-reflecting, preferably platelet-shaped, pigments of the invention are used preferably in emulsion paints for the interior or exterior sector.
  • Application media pigmented with the pigments of the invention possess a largely white appearance.
  • the whiteness of these application media may where appropriate be increased further by means of further addition of white pigments such as TiO 2 or else of fillers.
  • white pigments such as TiO 2 or else of fillers.
  • colorants such as organic or inorganic color pigments, it is possible to produce colored emulsion paints.
  • the emulsion paint In order to maximize the IR emittance of a wall painted, for example, with an emulsion paint, it is preferred for the emulsion paint to contain the pigments of the invention in an amount such that the fraction of the IR-reflecting cores, based on the weight of all the nonvolatile components of the emulsion paint, is 2% to 30%, preferably 4% to 20%, and more preferably 7% to 15% by weight.
  • emulsion paints pigmented with the pigments of the invention coatings are possible which possess IR emittances of below 0.5, preferably below 0.4, and more preferably below 0.3.
  • the lower limit of the emission in this case is approximately 0.2.
  • the degree of IR emittance is defined as follows:
  • a conventionally applied wall paint possesses an emittance of approximately 0.9; in other words, only about 10% of the IR radiation is reflected, and 90% of the IR radiation is absorbed or transmitted by the wall paint and, ultimately, is lost in the form of heat.
  • the further components of the emulsion paint such as binders or fillers, for example, likewise to have a very low IR absorption.
  • the levels of pigmentation of the binders, fillers and/or white pigments may be significantly lower than is typical in the art.
  • the IR-reflecting, preferably platelet-shaped, pigments of the invention are used preferably as a very opaque white pigment in coating materials, preferably in colored coating materials, and very preferably in colored industrial coatings.
  • the core used is preferably a platelet-shaped aluminum pigment having an average size of 5 to 12 ⁇ m
  • the white pigment used is preferably TiO 2 , ZnS and/or ZnO with a preferred diameter of 250 to 320 nm
  • the matrix used is preferably SiO 2 .
  • a primary place is occupied not only by the IR-reflecting properties of the pigment but also, more particularly, by the outstanding opacity of the platelet-shaped aluminum core in the optical range.
  • Colored industrial coatings are often pigmented with large quantities of expensive colored pigments, but on account of the transparency of those pigments possess inadequate opacity.
  • white pigments such as TiO 2 does improve the opacity, but inevitably leads to a lighter shade. If the pigments of the invention are added to an industrial coating, then, advantageously, the opacity can be distinctly improved even at very low levels of pigmentation, i.e., with small quantities added, without having to accept any substantial lightening of the coating.
  • the pigments of the invention for applications in a varnish or industrial coating, are used at pigmentation levels of 0.1% to 4% by weight, preferably of 0.2% to 1.5% by weight, and more preferably of 0.3% to 1.0% by weight, based in each case on the weight of the total formulation.
  • Standart® Reflexal 214 (ECKART GmbH & Co. KG) is incorporated with stirring into 4 parts of acetone, and then 1 part of a ground bulk polymer based on methyl methacrylate (Degalan M 527; Degussa) and 1 part of Kronos 2310 are added and the mixture is stirred until the polymer has dissolved completely.
  • the resulting suspension is sprayed via a spray-drying apparatus at temperatures above 60° C.
  • the resulting pigment is in the form of a white, nonlustrous powder.
  • Standart® Reflexal 214 (ECKART GmbH & Co. KG) is incorporated with stirring into 4 parts of acetone, and then 1 part of a ground bulk polymer based on methyl methacrylate and 1 part of ZnS (Sachtolith L; Sachtleben; average particle size: 0.35 ⁇ m) as white pigment are added and the mixture is stirred until the polymer has dissolved completely.
  • the resulting suspension is sprayed via a spray-drying apparatus at temperatures above 60° C.
  • the resulting pigment is in the form of a white, nonlustrous powder.
  • Standart® Reflexal 214 (ECKART GmbH & Co. KG) is mixed with 1 part of Kronos 2310 white pigment by means of a centrifugal mixing assembly (DAC 400 FWC from Hausschild; Hamm) at 1000 rpm for 5 minutes.
  • DAC 400 FWC centrifugal mixing assembly
  • the pigments of examples 1 to 9 were incorporated into an otherwise unpigmented conventional varnish based on a polyester/CAB system (binders: 22% by weight CAB 381-2 and 9% by weight CAB 551-0.2, both from Eastman, and 13% by weight Viacryl SC 303, from SurfaceSpecialities). The level of pigmentation was in each case 10% by weight, based on the total varnish. Using a 50 ⁇ m coating knife, drawdowns were prepared and subjected to calorimetric measurement. Gloss values were determined by means of the Tri-Gloss gloss meter from Byk-Gardner at 60° C., and the L,a,b values were determined at the observation angles of 15°, 25°, 45°, and 110° C. (M 682, X-Rite). These values were used to calculate the flop index in accordance with formula (2) and, in conventional manner, the chroma at 250. The results are shown in Table 1:
  • Comparative example 9 has similar values for gloss, L* 45 °, chroma, and lightness flop as the inventive examples.
  • the degrees of gloss, however, are somewhat higher.
  • the purely physical mixture of white pigments and aluminum pigments here has an apparently similar appearance to the inventive examples. Nevertheless, this mixture appears far less white and induces a greater “metallic” sensation in the observer.
  • the visually assessed sparkle sensation is weakly or very weakly pronounced in the case of the pigments of the inventive examples.
  • the non-white-colored metal pigments of the comparative examples exhibit a pronounced sparkle behavior. This is because they are very large pigments, which can be perceived individually by the human eye within a paint.
  • the comparative example 9 which in the calorimetric characterizations still showed very similar values to the inventive examples.
  • the calculated lightness differences are above a value of 1.5 in the case of the pigments of the invention of the inventive examples.
  • the pigment of comparative example 5 (pigments with SiO 2 coating) likewise show a positive ⁇ L* value in comparison to the completely uncoated metal pigment, but the whiteness is not quite as high.
  • ⁇ L* values measured appear low, but the human eye is very sensitive specifically to the sensation of a white impression. In visual terms, therefore, it is possible to perceive very distinct differences between the emulsion paint pigmented with the pigments of the invention and the emulsion paint pigmented with the uncoated pigments.
  • the visually assessed whiteness of the inventive examples is consistently strong to very strong.
  • the comparative example 9 shows only a moderate whiteness.
  • the graying tendency of the uncoated aluminum pigments is manifested more strongly here.
  • the very coarse aluminum pigment appears to possess little graying tendency on account of its poor opacity.
  • IR spectra were measured in diffuse reflection.
  • KBr powder was comminuted in a mortar. Then pigment was added to the KBr in a concentration of 1.5% by weight and the constituents were mixed homogeneously with one another.
  • a tablet-shaped sample chamber (diameter: about 0.8 cm, depth: about 2.2 mm) was filled with the KBr/pigment mixture, which was tamped down. Subsequently the diffuse reflection was measured in a wavelength range from 2.5 to 25 ⁇ m. This was done using, as a measuring unit, the Selector (Specac). This instrument measures the diffuse IR reflection in a quarter-sphere geometry.
  • the IR instrument used was an Avatac 360 spectrometer from Thermo; the detector was a DTGS detector.
  • a pure KBr powder was measured as the background spectrum, and the spectrum of the KBr/pigment mixture was compared against it. The process is repeated three times and the average of the measurements is taken.
  • FIGS. 2 and 3 depict the spectra of a number of inventive and comparative examples and plotted additionally (without scale) is the calculated Planck radiation function at 300 K.
  • a comparison of the spectra of FIG. 2 shows that the pigments of inventive example 1 possess a lower reflection than the uncoated metal pigment of comparative example 3. This can be attributed to a certain degree of IR absorption by the TiO 2 pigments and the SiO 2 matrix of the coating. Overall, nevertheless, the reflection is high enough to produce an IR-reflecting pigment. Similar circumstances can be observed in FIG. 3 for the finer pigments. In this case the reflection and the reflectance, more particularly for inventive example 6, are significantly higher than for examples 2 or 4. This can be attributed to the low IR absorption of ZnS pigments in comparison to TiO 2 pigments.
  • the pigments of the inventive examples possess an IR reflectance of significantly more than 50%.
  • the influence of the coatings on the IR reflectivity is relatively low, as may be inferred from the high values of more than 71% for the IR reflectance, coating. Particularly in the case of inventive example 6 the influence of the coating is only very small.
  • the pigments of comparative examples 3 and 4 possess even higher reflectances, since there are no coatings present. On account of their graying effects and their distinct sparkle effect, however, these pigments cannot be used in a wall paint. In the case of comparative example 9, in contrast, the reflectance is relatively small, since here the TiO 2 added to the mixture effects absorption.
  • the IR-reflecting pigments of the invention display advantages in relation to mixtures of uncoated effect pigments and white emulsion paints.

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US12/158,133 2005-12-21 2006-12-21 White Pigment Reflecting Ir Radiation, Production and Use Thereof Abandoned US20080295737A1 (en)

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DE102005061684.4 2005-12-21
DE102005061684A DE102005061684A1 (de) 2005-12-21 2005-12-21 Weißes, IR-Strahlung reflektierendes Pigment, dessen Herstellung und Verwendung
PCT/EP2006/012416 WO2007076967A2 (fr) 2005-12-21 2006-12-21 Pigment blanc reflechissant le rayonnement infrarouge, sa production et son utilisation

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JP5419461B2 (ja) 2014-02-19
EP1963440A2 (fr) 2008-09-03
CN102675917A (zh) 2012-09-19
CN102660147B (zh) 2015-04-08
ES2396961T3 (es) 2013-03-01
EP2348074A3 (fr) 2011-10-26
EP2348075B1 (fr) 2015-11-11
EP2348074B1 (fr) 2016-03-02
EP1963440B1 (fr) 2012-10-17
US20150247040A1 (en) 2015-09-03
US10023746B2 (en) 2018-07-17
CN102660147A (zh) 2012-09-12
WO2007076967A3 (fr) 2007-11-08
CN101341218B (zh) 2012-05-30
EP2348075A2 (fr) 2011-07-27
EP2348075A3 (fr) 2011-10-26
WO2007076967A2 (fr) 2007-07-12
EP2348074A2 (fr) 2011-07-27
DE102005061684A1 (de) 2007-06-28
CN101341218A (zh) 2009-01-07
JP2009520844A (ja) 2009-05-28
CN102675917B (zh) 2015-10-28

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