Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB1487230A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IG Farbenindustrie AG
Original Assignee
IG Farbenindustrie AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by IG Farbenindustrie AGfiledCriticalIG Farbenindustrie AG
Priority to GB1487230ApriorityCriticalpatent/GB354794A/en
Publication of GB354794ApublicationCriticalpatent/GB354794A/en
C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
C01G9/00—Compounds of zinc
C01G9/02—Oxides; Hydroxides
Landscapes
Chemical & Material Sciences
(AREA)
Organic Chemistry
(AREA)
Inorganic Chemistry
(AREA)
Luminescent Compositions
(AREA)
Abstract
Zinc oxide or hydrated zinc oxide for use as a pigment is obtained by adding to a zinc lye, for instance, zinc chloride solution, so much alkali hydroxide as will produce in the liquid above the precipitate a pH value of 12-12,8. The precipitate is washed and dried below red heat, for instance, at 100 DEG C. An alkaline-earth hydroxide may alternatively be used as the precipitant, this being added in less than the equivalent amount. The necessary pH value of the liquid above the filtered and washed precipitate is then obtained by the addition of alkali hydroxide. The pigment, which has an average particle size of 0,7-1 micron, gives a yellowish luminescence in ultra-violet light.
GB1487230A1930-05-141930-05-14Manufacture of zinc white
ExpiredGB354794A
(en)