Panchromatically sensitive zinc oxide

Details Panchromatically sensitive zinc oxide Panchromatically sensitive zinc oxide

1975-04-30

1977-03-22

Vertiz, Oscar R.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

96 18, C01G 902, G03G 508

Patent

active

040137830

ABSTRACT:
A stable panchromatically sensitized zinc oxide having a low moisture sensitivity with dark discharge properties rendering it suitable as the photoconductive material of elements for indirect as well as direct electrophotography is produced by reacting finely divided zinc oxide with gaseous ammonia and carbon dioxide, while keeping the zinc oxide particles in motion, until a critical stage is reached corresponding usually to a weight increase of 4 to 7.5%, at which point the reacting is terminated and the product is heated to constant weight at a temperature between 190.degree. and 350.degree. C. Photoconductive elements made with the panchromatically sensitive zinc oxide not only are reusable indefinitely under varying atmospheric humidity conditions without loss of their sensitivity, but also exhibit a memory effect much lower than that of known photoconductive zinc oxides.

REFERENCES:
patent: 2727808 (1955-12-01), Thomsen
patent: 3329590 (1967-07-01), Renfrew
"Zinc Oxide Rediscovered," 1963, pp. 60-71.
In Re Edwards 109 U.S.P.Q. 380; 1956 C.D. 264.

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