C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
23/281, 400/7050
C08L 101/00 (2006.01) C01F 5/10 (2006.01) C01F 5/14 (2006.01) C01F 5/16 (2006.01) C08K 3/22 (2006.01)
Patent
CA 2032470
A finely powdery magnesium hydroxide especially suitable as flame-retardant filler for plastic compounds, in which the particles are provided optionally with a thin coating of a surfactant. The grain size of the magnesium hydroxide, measured by laser diffraction, is below 10 µm, the median value of the grain size being greater than 0.8 µm and 3 µm at the utmost. The contents of water-soluble ionic impurities, viz. Ca++, Na+, K+, SO4--, C1-, of the magnesium hydroxide are below the following limits (in parts by weight): Ca++ < 1000 ppm, Na+ < 20 ppm, K+ < 20 ppm, SO4-- < 1500 ppm, Cl- < 1000 ppm, and the contents of Mn, Cu and Ni are below the following limits (in parts by weight): MnO < 100 ppm, NiO < 100 ppm, CuO < 10 ppm. The process for preparing the magnesium hydroxide starts from a magnesium oxide obtained by spray roasting from a magnesium chloride solution from which previously foreign matter has been removed, to which magnesium oxide water is added for hydration, whereupon the resulting magnesium hydroxide is removed by filtration and the filter cake material is subjected to a post-wash with water.
Grill Michael
Meier Andreas
Ridout & Maybee Llp
Veitscher Magnesitwerke-Actien-Gesellschaft
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