Composite pigments containing calcium phosphate and method for their manufacture

• Main Authors: Mersch, Frank, Wilkenhoener, Uwe
• Format: Patent
• Language: English
• Published: 11.08.2020
• Subjects: ADHESIVES; BLASTING; BRAKES; CHEMISTRY; CLUTCHES; COUPLINGS FOR TRANSMITTING ROTATION; DYES; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MECHANICAL ENGINEERING; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; PAINTS; POLISHES; PREPARATION OF CARBON BLACK; THERMAL INSULATION IN GENERAL; TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS,TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES; WEAPONS

The invention relates to composite pigment particles containing calcium phosphate, their manufacture and their use in coatings, plastics and laminates. The composite pigment particles contain titanium dioxide pigment particles and precipitated calcium phosphate. In one embodiment, the composite pigment particles additionally contain an inorganic and/or organic filler as an extender, preferably selected from the group comprising Ca, Ca-Mg and Mg carbonates, natural and synthetic silicon dioxide and oxides. The composite pigment particles are manufactured in a combined process of dispersion and precipitation. Depending upon the combination selected, use of composite titanium dioxide pigment particles of the invention can provide improved optical properties such as tinting strength or permits pigment savings with little to no loss of optical properties. In particular, the composite pigment particles of the invention can be used to replace part or all of the titanium dioxide contained in the user's system.