MODIFIED NACREOUS LUSTRE PIGMENTS FOR WATER PAINT SYSTEMS

摘要

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:whereA=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>=4 and a<=e<=2a, where 0<=a/(b+c+d)<=3, especially for a/(b+c+d) equal to 0 if a=0 and/or c equal to d equal to 0 and b>=1 and also for 0.5<=a/(b+c+d)<=3.