Carbonate-containing mineral fillers, pigments and similar materials
AssigneePluss-Staufer AG
InventorsDieter Strauch, Peter Belger, Heiner Hofer, Martin Merz
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Abstract
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.
Claims38
Carbonate-containing mineral fillers, pigments and similar materials, having a mean particle-diameter of 0.5 to 2.5 .mu.m and the following further physical properties:
- (a) a contrast factor of 1.2 to 2.1.
- (b) a fraction of 30 to 98% by weight of particles in particle diameter range 0.5 to 1.8 .mu.m, and
- (c) a dispersibility, expressed in particle fineness according to DIN 53203, of 5 to 25 .mu.m.
The method preparing calcium carbonate-containing mineral fillers, pigments and similar materials which comprises the steps of dry grinding an initial material with an upper section of 10 to 50 .mu.m and a mean particle diameter ranging from 2 to 10 .mu.m and then grading by wind screening said ground material by particle size, so that said screened product has the physical properties
- (a) a contrast factor of 1.2 to 2.1;
- (b) a mean particle diameter of 0.5 to 2.5 .mu.m;
- (c) a fraction of 30 to 98% by weight of particles in the particle-size range from 0.5 to 1.0 .mu.m;
- and
- (d) a dispersibility, expressed in particle fineness in accordance with DIN 53203 of 5 to 25 .mu.m.
Dependencies are inferred from the claim text.