Carbonate containing mineral fillers more particulary for use as matting agents
AssigneePluess-Staufer AG
InventorsHarald Pfaller, Dieter Strauch
Life of this patent
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Abstract
Carbonate containing mineral fillers, and more particularly natural and/or precipitated calcium carbonates, characterized by the following grain size distribution: ______________________________________ <61 .mu.m: 100% <56 .mu.m: 95-100% <40 .mu.m: 90-100% <20 .mu.m: 48-95% <10 .mu.m: 15-52% <5 .mu.m: 9-28% <1 .mu.m: 0-10% d.sub.50 : 9.6-20.5 .mu.m ______________________________________ may with advantage be employed as mineral fillers, preferably as matting agents and in a more especially preferred fashion for aqueous paint systems.
Claims5
A liquid coating material for application to surfaces comprising a liquid stock and grains of a calcium carbonate material comprising grains made from a natural calciuum carbonate selected from the group consisting of limestone, chalk and marble, the grains having a size distribution of:
- ______________________________________ <61 .mu.m:
- 100% <56 .mu.m:
- 95-100% <40 .mu.m:
- 90-100% <20 .mu.m:
- 48-95% <10 .mu.m:
- 15-52% <5 .mu.m:
- 9-28% <1 .mu.m:
- 0-10% d.sub.50 :
- 9.6-20.5 .mu.m. ______________________________________
A method of producing a liquid coating material comprising the steps of providing a liquid stock;
- forming calcium carbonate particles by comminuting natural calcium carbonate selected from the group consisting of limestone, chalk and marble;
- segregating the calcium carbonate particles so that they have a particle size distribution as follows:
- ______________________________________ <61 .mu.m:
- 100% <56 .mu.m:
- 95-100% <40 .mu.m:
- 90-100% <20 .mu.m:
- 48-95% <10 .mu.m:
- 15-52% <5 .mu.m:
- 9-28% <1 .mu.m:
- 0-10% d.sub.50 :
- 9.6-20.5 .mu.m;
- ______________________________________
- and mixing the segregated calcium carbonate particles having the particle size distribution into the stock.
Dependencies are inferred from the claim text.