Process for desensitizing diazo lithographic printing forms usin

Details Process for desensitizing diazo lithographic printing forms usin Process for desensitizing diazo lithographic printing forms usin

1983-11-02

1985-07-23

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Making printing plates

430309, 430331, 430512, 101456, 101465, G03F 708

Patent

active

045308977

ABSTRACT:
The invention relates to a solution and a process for desensitizing lithographic printing forms based on light-hardened diazo compounds and which are ready for printing. The desensitizing solution of the invention is composed of a water-soluble, film-forming, high molecular weight organic compound, a compound which has a high light-absorption in the spectral region in which the photolysis of light-sensitive aromatic diazo compounds is initiated, and water as the solvent.
The desensitizing solution protects the image stencil against the action of light and prevents any deterioration of the oleophilic character of the image stencil during storage.

REFERENCES:
patent: 2203767 (1940-06-01), Baldsiefen
patent: 3253918 (1966-05-01), Condax
patent: 3459128 (1969-08-01), Erdmann et al.
patent: 3498791 (1970-03-01), Rauhut
patent: 4033919 (1977-07-01), Lawson
patent: 4328304 (1982-05-01), Tachikawa
Ullmanns Encyklopadie der Technischen Chemie--Dr. Foerst (translation appended).
Encyclopedia of Polymer Science and Technology--vol. 14, pp. 129 & 139.

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