Vacuum packaged color developing composition

Details Vacuum packaged color developing composition Vacuum packaged color developing composition

1991-05-08

1993-06-08

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Nonradiation sensitive image processing compositions or...

Developer

430464, 430466, 430450, 430403, 2065248, 206578, G03C 518, G03C 526

Patent

active

052178544

ABSTRACT:
A vacuum package of a color developing composition comprising an aromatic primary amine color developing agent and other components is obtained by vacuum packaging the components in a bag as a layered structure of at least three solid state layers each consisting of a distinct component. A bottom layer consists of the color developing agent. A layer containing a component selected from an organic acid, brightener, polymer, surface active agent, and neutral salt is disposed adjacent the color developing agent layer. Additional layers containing a preservative and an alkaline agent are stacked on the bottom layer through the adjacent layer. The packaged composition is taken out of the bag and diluted with water to prepare a color developer.

REFERENCES:
patent: Re28185 (1974-10-01), Bimmler et al.
patent: 4770979 (1988-09-01), Koboshi et al.
patent: 4780357 (1988-10-01), Akao
patent: 4784906 (1988-11-01), Akao

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