Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...
Patent
1987-02-25
1988-07-26
Lieberman, Paul
Compositions: coating or plastic
Materials or ingredients
Pigment, filler, or aggregate compositions, e.g., stone,...
106438, 106442, 423613, 423240, C09C 136
Patent
active
047598000
ABSTRACT:
A process for the improvement of titanium dioxide pigments by a post-treatment, wherein the titanium dioxide pigment produced by any process, in the form of an aqueous suspension and in any order, is treated with an aqueous titanium oxide chloride solution resulting from the scrubbing of off-gases derived from the production of titanium tetrachloride and, optionally, with one or more other water-soluble metal salts which when neutralized form difficult-to-dissolve oxide hydrates and/or other difficult-to-dissolve compounds, and/or optionally with a water-soluble silicate, and where difficult-to-dissolve oxide hydrates and/or other difficult-to-dissolve compounds are precipitated onto the titanium dioxide pigment from the titanium oxide chloride solution and, if present, from the other metal salts and/or the silicate, and where the titanium dioxide pigment thus treated is recovered such as by being separated from the suspension, washed, dried and milled. It is found that such a post-treatment can improve titanium dioxide pigments in various properties such as weather resistance and optical properties.
REFERENCES:
patent: 3146119 (1964-08-01), Ritter
patent: 3647377 (1972-03-01), Hilgers et al.
patent: 3760071 (1973-09-01), Brzozowski et al.
patent: 3873335 (1975-03-01), Schmidt et al.
patent: 3876442 (1975-04-01), Thomas
patent: 4050951 (1977-09-01), Piccolo et al.
patent: 4083946 (1978-04-01), Schurr et al.
patent: 4533530 (1985-08-01), Hartmann
Luginsland Hans H.
Rosendahl Franz
Kronos Titan GmbH
Lieberman Paul
Thompson Willie J.
LandOfFree
Process for the improvement of titanium dioxide pigments by post does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for the improvement of titanium dioxide pigments by post, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the improvement of titanium dioxide pigments by post will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-256483