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Abstract

Modified pearl luster pigments for waterborn coating systems, based on a platelet-form substrate coated with metal oxides and, located on the topmost metal oxide layer, a top layer consisting of at least two oxides and/or mixed oxides from the group consisting of silicon dioxide, aluminium oxide, cerium oxide, titanium oxide and zirconium oxide, and on a water-based oligomeric silane system. The oligomeric silane system can be described, for example, by the following approximate structure: [HO[Si(A)(OH).sub.z (CH.sub.3).sub.1-z O].sub.a [Si(B)(OH).sub.y (CH.sub.3).sub.1-y O].sub.b [Si(E)(OH).sub.w (CH.sub.3).sub.1-w O].sub.c [Si(D)(OH).sub.v (CH.sub.3).sub.1-v O].sub.d H].(HX).sub.e (IX) where A=aminoalkyl radical derived from the general formula V, B=glycidyl ether alkyl radical derived from the general formula VI, E=acryloxyalkyl or methacryloxyalkyl radical of the general formula VII, D=alkyl radical of the general formula VIII, HX=monobasic acid, where X=inorganic or organic acid radical such as, for example, chloride, nitrate, formate, acetate, v is equal to 0 or 1 and w is equal to 0 or 1 and y is equal to 0 or 1 and z is equal to 0 or 1 and a+b+c+d.gtoreq.4 and a.ltoreq.e.ltoreq.2a, where 0.ltoreq.a/(b+c+d).ltoreq.3, especially for a/(b+c+d) equal to 0 if a=0 and/or c equal to d equal to 0 and b.gtoreq.1 and also for 0.5.ltoreq.a/(b+c+d).ltoreq.3.

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First Claim