Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...
Patent
1994-06-02
1997-04-08
Bell, Mark L.
Compositions: coating or plastic
Materials or ingredients
Pigment, filler, or aggregate compositions, e.g., stone,...
106410, 106413, 106415, 106417, 106418, 106438, 106441, 106468, 106469, 106486, 106DIG3, C04B 1420
Patent
active
056183429
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a non-dusting, homogeneous pigment preparation.
Industrially, pigments are frequently not used in the form of powders, since the latter are prone to dusting, which necessitates tighter occupational hygiene safety requirements. Furthermore, powders introduced into plastics, basecoating systems, etc. are frequently observed to agglomerate, and it is very difficult or even impossible to achieve a homogeneous distribution of the pigment in the particular matrix.
Instead of pigment powders non-dusting pigment preparations are used. The components of the preparation should be highly compatible with the other components of the particular coating system and should ensure for example ready homogeneous dispersal of the preparation after it has been incorporated.
Aqueous pigment preparations, which have long been needed for example for cosmetics, are becoming increasingly important for other applications, for example for the production of waterborne paints etc., for environmental reasons.
As well as good compatibility with the other constituents of the coating system, pigment preparations must possess high stability; that is, they must not be prone to phase separation. This requirement is particularly important in the case of pigment preparations based on flaky pigments, since in the event of phase separation these pigments, owing to their structure, tend to clump together and are very difficult to redisperse and since the separation phenomenon occurs in a particularly pronounced form in pigment preparations containing flaky pigments. For instance, an aqueous pigment preparation obtained by pasting a powder of flaky pearl luster pigments with water lacks stability.
The preparations of flaky pigments hitherto developed for use in aqueous coating systems do not meet the stated requirements.
SUMMARY OF THE INVENTION
An object of the present invention is therefore to provide pigment preparations based on flaky pigments which coating system.
It has been found that this object is achieved by the preparations according to the present invention.
The present invention accordingly provides non-dusting, homogeneous pigment preparations for use in aqueous coating systems which contain
The flaky pigments used are preferably interference pigments based on flaky, transparent or semi-transparent substrates made for example of sheet-silicates such as mica, talc, kaolin, or of glass or other silicated materials which have been coated with one or more layers of at least one metal oxide or metal oxide hydrate. More particularly, at least one of these layers preferably contains one or more high refractive index metal oxides or metal oxide hydrates selected from the following group:
titanium oxide, tin oxide, zirconium oxide, zinc oxide, iron oxide, chromium oxide, nickel oxide, cobalt oxide and the corresponding oxide hydrates.
It is also possible to use in the pigment preparations of the invention flaky metal oxides such as, for example, iron oxide or bismuth oxychloride.
As flaky pigments it is also possible to use metal flakes which may be uncoated or else coated with one or more metal oxide layers; preference is given for example to Al, Cr, Fe, Au, Ag and steel flakes. If readily corrodible metal flakes such as, for example, Al, Fe or steel flakes are to be used without a coating of metal oxide, they are preferably coated with a protective polymer layer.
These flaky pigments are known and are for the most part commercially available and/or they are preparable by standard methods known to the person skilled in the art. Interference pigments based on transparent or semitransparent flaky substrates (pearl luster pigments) are described 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 and 32 35 017.
The pigments of the invention may contain one or more flaky pigments, frequently, special effects can be achieved by using at
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Herget Gerhard
Kieser Manfred
Stahlecker Otto
Bell Mark L.
Hertlog Scott L.
Merck Patent Gesellschaft mit beschrankter Haftung
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