The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 19, 1977
Filed:
Oct. 20, 1975
Bayer Aktiengesellschaft, Leverkusen, DT;
Abstract
In the production of temperature-stable inorganic pigment of pseudobrookite-titanium dioxide structure having the composition Fe.sub.2 TiO.sub.5.sup.. x TiO.sub.2, wherein x is from 0 to about 15, by preparing a suspension of finely divided titanium dioxide or titanium dioxide hydrate and at least one of finely divided iron oxide, iron oxide hydroxide, iron hydroxide and iron carbonate, removing the aqueous phase of the suspension from a solid residue and calcining the residue at a temperature in the range of about 600.degree. to 1100.degree.C, the improvement which comprises including in the suspension or in the solid residue at least one compound of a metal selected from the group consisting of lithium, sodium, potassium, magnesium, zinc, calcium, aluminum, copper, vanadium, chromium, manganese, cobalt and nickel, the compound being present in a quantity to provide about 0.1 to 10 % by weight of metal based on the pigment. With the addition of compounds of lithium, sodium, potassium, magnesium, zinc, calcium or aluminum even in small amounts a much purer yellow color results.