FO, 2. by Ed ATTORNEYS 3,485,583 United States Patent Office Patented Dec
Dec. 23, 1969 W. L. WILSON PROCESS FOR PREPARING IMPROVED TITANIUM DIoxIDE Filed Oct. 8, 1965 ?zzzzzzzzzzzzzzzzzz§<<<<<<<<<<<<<<< 24227 INVENTOR WillLIAM L. WILSON FO, 2. BY ed ATTORNEYS 3,485,583 United States Patent Office Patented Dec. 23, 1969 2 More particularly, there is produced a raw, uncoated 3,485,583 pigmentary titanium oxide particle hawing improved dis PROCESS FOR PREPARING IMPROVED TITANIUM DOXOE persion, a tinting strength of at least 1600, usually at William L. Wilson, Barberton, Ohio, assignor to PPG least 1700, a blue undertone (tint tone), and a particle Industries, Inc., Pittsburgh, Pa., a corporation of size distribution range below 1.0 micron in mean diameter, Pennsylvania preferably 0.2 to 0.5 micron, with a final tinting strength Filed Oct. 8, 1965, Ser. No. 494,175 of at least 1780, usually above 1800, when the raw pig Int. C. C01g23/04 ment is wet treated or coated as disclosed, for example, by U.S. C. 23-202 4 Claims U.S. Letters Patent 3,146,119 issued to Dr. Hartien S. 10 Ritter; copending U.S. patent application Ser. No. 469,881, filed July 6, 1965 by Dr. Harry Lott, Jr. and Dr. Albert Dietz; and copending U.S. patent application Ser. No. ABSTRACT OF THE DISCLOSURE 469,864, filed July 6, 1965 by Dr. Albert Dietz and Dr. Pigmentary titanium dioxide of improved optical prop Harry Lott, Jr. erties is prepared by vapor phase reaction of titanium 15 Sources of the metals noted hereinbefore include, not tetrahalide in the combined presence of a source of by way of limitation, each metal in elemental state, alloys thorium and a source of at least one member selected containing one or more of the metals, and organic and/or from the group consisting of potassium, rubidium, cesium, inorganic compounds containing one or more of the vari sodium, lithium and zinc.
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