Kronos International Inc. | Date: 2014-12-09
The invention relates to a method for manufacturing composite particles, particularly composite particles based on titanium dioxide and carbonate, with the help of combined mixing, homogenization and precipitation in a pipeline mixer based on the rotor-stator principle. The method is based on an aqueous suspension of a particulate base component (e.g. titanium dioxide), which is preferably produced in an intermediate vessel equipped with a high-speed agitator. At least one of the required precursor substances and/or a pH-controlling component for precipitating calcium carbonate, for example, is metered into the pipeline mixer, and the calcium carbonate is precipitated. The method can be operated as a continuous process or as a batch process and permits shorter production times. The composite particles produced display homogeneous dispersion of the precipitated particles and the particulate base component.
Kronos International Inc. | Date: 2014-12-08
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, CaMg 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 users system.
Kronos International Inc. | Date: 2014-11-19
The invention relates to a method for coating the surface of inorganic solid particles in an aqueous suspension. The untreated particles, particularly TiO
Kronos International Inc. | Date: 2013-09-04
The invention relates to rutile titanium dioxide pigment particles that are capable of reflecting infrared radiation to a high degree and also display pigmenting properties, as well as a method for their manufacture. The particles have a mean particle size of 0.4 to 1.0 m and are doped with zinc and potassium, but not with aluminium. Preferably, the particles have a compact particle form with a preferred height:width ratio of 1.5:1. The particles are preferably manufactured by the familiar sulphate process for manufacturing titanium dioxide, and are optionally subjected to inorganic and/or organic post-treatment following calcining. Preferably, the rutile titanium dioxide particles are suitable for manufacturing heat-insulating paints, coatings or plastics as well as for instance plasters or paving stones.
Kronos International Inc. and Steag Power Minerals Gmbh | Date: 2012-11-15
A construction material mixture used as a concrete additive contains a puzzolanic substrate and a photocatalyst. The puzzolanic substrate and the photocatalyst are available in the form of a dry mixture. The construction material mixture is a cement free dry mixture, wherein the photocatalyst has a primary particle size of between 2 nm and 100 nm. The puzzolanic substrate consists of at least 90 weight % of fly ash with a grain size of between 0.1 m and 1 mm. The substrate and the photocatalyst are available completely mixed so that the photocatalyst is at least partially distributed on the surface of the substrate.