Composition and process for developing diazotype material

Details Composition and process for developing diazotype material Composition and process for developing diazotype material

1979-03-01

1981-08-25

Kimlin, Edward C.

Radiation imagery chemistry: process, composition, or product th

Diazo reproduction, process, composition, or product

Diazo-type process, i.e., producing dye image by reacting...

430154, 430435, 430486, G03C 158, G03C 522, G03C 534

Patent

active

042860415

ABSTRACT:
A composition and process for developing diazotype material utilizes a developing liquid comprising a buffered, aqueous solution of an azo-coupling component having a pH between 5.5 and 8 and, as an additive compound, sorbic acid, an alkali metal salt, ammonium salt, or magnesium salt of sorbic acid or mixtures of the same. The process produces a clear copy image more quickly than a process in which the developing liquid does not contain the additive compound and, when the azo-coupling component is a mixture of phloroglucinol and resorcinol, forms a neutrally black image. The additive compound is added in an amount of 10 to 80%, and preferably 30 to 60%, by weight, of the maximum amount soluble in the solution at room temperature.

REFERENCES:
patent: 2113944 (1938-04-01), Leuch
patent: 4043816 (1977-08-01), Bomers
West et al., Textbook of Biochemistry, 3rd Ed., pp. 34-41.
Lucas, Organic Chemistry, 2nd Ed., 1953, p. 196.
Lyman, American Pharmacy, 1945, pp. 128-129.

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