Pluss-staufer Ag

Alfred Bosshard

Pierre Delfosse

A varnish or paint containing ultrafine natural calcium carbonate as a filler, the carbonate having an average statistical particle diameter of from 0.5 to 0.7 .mu. and a maximum diameter of from 3 to 4 .mu..

Ultrafine natural calcium carbonates as fillers in varnishes and paints

Filled polymer containing natural calcium carbonate having a statistical particle diameter of from 0.5 to 0.7 micron and average maximum diameter of from 3 to 4 microns.

Use of ultrafine natural calcium carbonates as fillers in natural and

A coated paper comprising an ultrafine natural calcium carbonate as a pigment, which has an average statistical particle diameter of from 0.5 to 0.7 .mu.m, a maximum diameter of from 3.0 to 4.0 .mu.m, and a specific surface area of at least 12sq.m./g.

Ultrafine natural calcium carbonates as coating pigments in coated papers

A process is disclosed for the wet grinding of a material such as chalk comprising the steps of preparing a suspension containing material particles no coarser than 43 microns and grinding the material in suspension using grinding bodies having a density of at least 3.7 g/cc, wherein the weight ratio of the grinding bodies to the material is at least 6:1. Specific types of grinding bodies are also disclosed.

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Oftringen, Switzerland

Alfred Bosshard