Pigment mixture comprising BiOCI pigments

Details Pigment mixture comprising BiOCI pigments Pigment mixture comprising BiOCI pigments

2002-02-28

2004-06-01

Koslow, C. Melissa (Department: 1755)

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

C106S417000, C106S418000, C106S479000

Reexamination Certificate

active

06743285

ABSTRACT:

The present invention relates to pigment mixtures in dispersion or in the form of a powder, consisting of at least two components, where component A comprises BiOCl pigments in the form of a powder or dispersion, and component B comprises pearlescent pigments, platelet-shaped, needle-shaped or spherical colorants and/or fillers, and to the use thereof in paints, coatings, printing inks, plastics, powder coatings, plastic films, for the finishing of seed and in particular in cosmetic formulations.
Since BiOCl pigments have a high refractive index (n=2.15) and a pearl-like or metallic silver lustre, they are employed in paints, coatings, plastics and in particular in cosmetic products. In addition to the metallic silver lustre or pearl lustre, the consumer of decorative products expects ever greater functionality and thus makes ever greater demands on the appearance. The BiOCl pigments disclosed in German Patent 10 03 377, U.S. Pat. No. 2,975,053, DE 24 11 966, EP 0 496 686 B1 and DE 43 05 280 A1 have the disadvantage that they either do not have variable hiding power, have inadequate metallic lustre, do not have an absorption colour, do not have an interference colour and/or do not have a light diffusing effect.
The object of the present invention was to provide a pigment mixture comprising BiOCl pigments which is distinguished by high, variable hiding power or variable transparency and/or increased metallic lustre, can be incorporated well into the respective application system and is stable therein, and in which a visible BiOCl/colorant or BiOCl/filler separation in the system is substantially excluded. Furthermore, the abrasion, application and skin feel in cosmetic materials should be improved compared with the products on the market.
Surprisingly, a pigment mixture has now been found which has none of the above-mentioned disadvantages. The pigment mixture according to the invention consists of at least two components, where component A comprises coated or uncoated BiOCl pigments in the form of a powder or dispersion, and component B comprises pearlescent pigments, in particular based on mica, SiO
2
, glass, Al
2
O
3
, TiO
2
, graphite or polymer platelets, platelet-shaped, needle-shaped or spherical colorants and/or fillers.
The admixing of component B with the BiOCl pigments enables increased metallic lustre to be imparted to the application systems, the colour effect is increased, and novel colour effects are achieved. At the same time, the pigment mixture is distinguished by its variable, i.e. controllable, hiding power from virtually invisible to strongly hiding. In addition, the functionality of the end product is improved. Formulations comprising the pigment mixture according to the invention have an excellent skin feel, high skin affinity, long-wear properties, variable hiding power, if desired metallic lustre, good ease of incorporation into the end product, and comparatively high light stability.
The invention thus relates to a pigment mixture consisting of at least two components, where component A comprises coated or uncoated BiOCl pigments in the form of a powder or dispersion, and component B comprises pearlescent pigments, platelet-shaped, needle-shaped or spherical colorants and/or fillers.
The invention likewise relates to the use of the pigment mixture according to the invention in paints, coatings, printing inks, including printing inks for security printing, plastics, plastic films, powder coatings, for the finishing of seed and in particular in cosmetic formulations.
The BiOCl pigments in the form of a powder can be mixed with component B in any ratio. The ratio of component A to component B is preferably from 1:90 to 90:1, particularly preferably from 1:50 to 50:1 and in particular from 1:20 to 20:1.
BiOCl pigments are commercially available and are offered, for example, by Merck KGaA, Germany, under the trade names Biron®, Bital®, Bicrona®, Mibiron® and Nailsyn®. Owing to the diverse production possibilities, BiOCl pigments having different optical properties, from matt to glossy and from transparent to hiding, are obtainable. The size of the individual particles is 1-100 &mgr;m, preferably 1-40 &mgr;m and in particular 2-35 &mgr;m. The BiOCl pigments employed may be coated or uncoated. In the case of the coated BiOCl pigments, the coating preferably consists of metal oxides, such as, for example, TiO
2
, TiO
2
sub-oxides, Fe
2
O
3
and mixtures thereof or organic or inorganic colorants of natural and synthetic origin. Preferred pigment mixtures comprise BiOCl pigments which are coated with Fe
2
O
3
, Carmine Red, Berlin Blue or Chromium Oxide Green.
As a dispersion, the BiOCl is preferably initially in the form of a paste with nitrocellulose lacquers or castor oil and is subsequently mixed with component B. The pigment mixture according to the invention in the form of a powder or dispersion is distinguished by good dispersibility, pH stability, heat stability and storage stability in the end product.
Besides pastes with castor oil and nitrocellulose lacquers, dispersions in water, polar and nonpolar oils, polyols, hydrophilic and hydrophobic solvents, volatile or non-volatile, are likewise suitable.
Preferred pigment mixtures comprise, in particular, one or more pearlescent pigments as colorant (=component B) in addition to the BiOCl pigments (=component A). The pearlescent pigments used are, in particular, pigments based on platelet-shaped, transparent or semi-transparent substrates made from, for example, phyllosilicates, such as, for example, synthetic or natural mica, talc, sericite, kaolin, or other silicate materials, which are coated with coloured or colourless metal oxides, such as, for example, TiO
2
, titanium sub-oxides, titanium oxynitrides, pseudobrookite, Fe
2
O
3
, Fe
3
O
4
, FeOOH, SnO
2
, Cr
2
O
3
, ZnO, CuO, NiO and other metal oxides, alone or in the form of a mixture in a single layer or in successive layers.
Pearlescent pigments are disclosed, for example, in the German patents and patent applications 14 67 468, 19 59 998, 20 09 566, 22 14 454, 22 15 191, 22 44 298, 23 13 331, 25 22 572, 31 37 808, 31 37 809, 31 51 343, 31 51 354, 31 51 355, 32 11 602, 32 35 017, 38 42 330 and 44 45 394 and are commercially available, for example under the trade names Colorona®, Timiron®, Dichrona®, Microna® and Soloron®, from Merck KGaA, Darmstadt, Germany.
Particularly preferred pigment preparations comprise TiO
2
, Fe
2
O
3
, TiO
2
sub-oxides, TiO
2
/Fe
2
O
3
, Fe
3
O
4
, FeOOH or FeOOH/TiO
2
mica pigments. Preference is furthermore given to TiO
2
, graphite, Fe
2
O
3
, SiO
2
or Al
2
O
3
platelets coated with TiO
2
and/or Fe
2
O
3
.
Further suitable platelet-shaped pigments are, in particular, pearlescent pigments based on SiO
2
platelets, Al
2
O
3
, graphite, polymer or TiO
2
platelets or glass platelets which are covered with one or more metal-oxide layers (one, two, three, five or seven).
Also suitable as component B are the multilayered pigments disclosed, for example, in DE-A 196 18 563, DE-A 196 18 566, DE-A 196 18 569, DE-A 197 07 805, DE-A 197 07 806 and DE-A 197 46 067. These are based on a platelet-shaped, transparent, coloured or colourless matrix consisting of mica (synthetic or natural), SiO
2
platelets, glass platelets, Al
2
O
3
platelets, TiO
2
platelets or polymer platelets and generally have a thickness of between 0.3 and 5 &mgr;m, in particular between 0.4 and 2.0 &mgr;m. The extension in the two other dimensions is usually between 1 and 250 &mgr;m, preferably between 2 and 100 &mgr;m, and in particular between 5 and 40 &mgr;m. The multilayered pigments consist of the matrix (substrate) coated with metal oxides (at least two). The coating of the substrate platelets, such as, for example, mica, SiO
2
platelets, glass platelets or Al
2
O
3
platelets, with a plurality of layers is carried out in such a way that a layer structure consisting of alternating high- and low-refractive-index layers is formed. The multilayered pigments preferably comprise 2, 3, 4, 5, 6 or 7 layers, in particular 3, 4 o

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