Photographic printing process, and composition and device for us

Details Photographic printing process, and composition and device for us Photographic printing process, and composition and device for us

1978-01-26

1980-05-13

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

Dyeing process utilizing electric, magnetic, or wave energy;...

96 89, 96 90R, 8465, 8651, 430332, D06P 520

Patent

active

042026628

ABSTRACT:
The invention provides a photographic printing process which consists of impregnating a support with a photosensitive composition comprising a leuco ester of a vat dyestuff, an acid-generating substance and a catalyst, squeezing out the said support, and exposing the latter to light. The invention also provides equipment for carrying out the process continuously comprising an impregnation tank, a cylindrical irradiation drum equipped with a light source of elongated shape, a neutralization tank, a buffering tank and a rinsing tank. The said drum is equipped to receive, on its outer surface, a photographic plate and a strip of impregnated woven fabric. This process makes it possible to produce monochrome or polychrome patterns with permanent colors.

REFERENCES:
patent: 2213745 (1940-06-01), Schenzel
patent: 2214365 (1940-09-01), Flynn et al.
patent: 2521485 (1950-09-01), Schoen
patent: 2559807 (1951-07-01), Topham
patent: 2580873 (1952-01-01), Womble
patent: 3944382 (1976-03-01), Doerr
K. Venkataraman, "The Chemistry of Synthetic Dyes," vol. II (Academic Press, New York), 1952, pp. 1055-1058.
Claussen et al., J. Soc. Dyers and Colourists, 1965, 81, pp. 350-355.
Reynolds, Silk Journal and Rayon World, Jul. 1945, pp. 32 and 42.

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