Pluss-staufer Ag

Pluess-staufer Ag

Omya Sa

Omya Ag

Dieter Strauch

Peter Belger

Pierre Delfosse

Heiner Hofer

Hans-Joachim Weitzel

Martin Merz

Rudiger Werner

Claude Wermuth

Harald Pfaller

Christian Naydowski

Max Schachenmann

A slurry containing water, carbonate-containing pigment, and dispersant consisting of 25-70 % by weight of agglomerated carbonate-containing pigment, 0.1-1.0% by weight of a dispersant, the balance being water up to 100%, can be used advantageously in papermaking as well as in the paint and lacquer industry. In a novel process for agglomerating ultra-fine particles in slurries the slurry is subjected to heat treatment until the agglomeration is complete.

Slurry containing an agglomerated carbonate-containing pigment

A coating color comprising 28-51% by weight of water, 43-64% by weight of carbonate-containing pigment with a specific particle distribution and a particle diameter of 0.18-0.28 .mu.m and a specific surface area of 19-26 M.sup.2 /g and 6-8% by weight of conventional binding agents and additives may be employed with advantage for coated papers. The coating color is produced by wet milling of the carbonate-containing pigment without the addition of dispersing or wetting agents at a solids concentration of 30-20% by weight in an agitating ball mill, subsequent concentration, re-dispersal and the addition of binding agents, water and additives.

Coating color

Carbonate containing mineral fillers, and more particularly natural and/or precipitated calcium carbonates, characterized by the following grain size distribution:

Carbonate containing mineral fillers more particulary for use as matting

A CaCO.sub.3 -talc coating pigment slurry consists of the following four co-ground components:

CaCO.sub.3 -talc coating pigment slurry, process of preparing the same,

A method for the production of natural and/or synthetic carbonates, and more particularly calcium carbonates, with a high BET/N.sub.2 specific surface area of over 20 m.sup.2 /g, and more particularly of between 20 to 50 m.sup.2 /g, utilizes an inherently known mill such as an agitating ball mill. The carbonates in an aqueous suspension are wet ground and the entire suspension is recirculated; that is, subjected to additional wet grinding, until the final product has the desired specific surface area. Furthermore, the solids concentration during the entire duration of the wet grinding operation is maintained at no more than 24% by weight. The products of the method have surprisingly valuable properties and can be employed in the plastics industry, in sealants, in the rubber industry, in printing inks, in cosmetics, in pharmaceuticals, in cigarette paper, in wood varnishes, in high gloss paper and in plastisols.

Method for the production of carbonates by wet grinding

Carbonate-containing mineral fillers, pigments and similar materials are disclosed which are characterized by a combination of four features. These carbonate-containing materials can be used in particular in dyes, paints, paper pulps, paper coatings and plastics to great advantage. In addition, a method of preparing these carbonate-containing materials is disclosed.

Carbonate-containing mineral fillers, pigments and similar materials

A novel high-solids coating substance for coating paper and the like is provided. The coatings are in the form of solutions having pigment concentrations greater than 70%. The coatings provide high gloss and contain particles of calcium carbonate as substantially the only pigment.

Coating substances with a high concentration of solids, for coated papers

A material especially adapted for incorporation in a coating composition, for example, as a secondary pigment, and characterized in having corrosion inhibiting properties. The material consists of finely particulate material on which is coated a film of fatty amine or fatty amine salt. The material coated on the particles is characterized in having a high area to volume ratio and the properties thereof in respect of inhibiting corrosion are thereby enhanced. The particulate material is advantageously natural crystalline calcium carbonate.

Corrosion preventative pigment and composition

Mineral filler surface treated with a mixture of saturated and unsaturated aliphatic acids, and use thereof.

Growing community of inventors

Zofingen, Switzerland

Dieter Strauch