Patent · US Expired

Dye diffusion process with base precursor salts of strong organic bases and weak organic acids

US4894312A · kind A · utility

1Cited by

6References

6Claims

0Family size

Assignee

Agfa-Gevaert NV · BE

Inventors

Holger Ohst · Odenthal, DE
Carlhans Suling · Odenthal, DE
Gunther Schenk · Cologne, DE
Kaspar Wingender · Leverkusen, DE
Manfred Peters · Bad Schwartau, DE
Immo Boie · Cologne, DE

Key dates

Filing date	Jun 3, 1988
Grant date	Jan 16, 1990
Priority date	—
Expiry date	Jun 3, 2008

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S430/156
WIPO fieldOptics
WIPO sectorInstruments

Abstract

Dye diffusion images can be produced by a rapid process in which a first sheet material which contains at least one light sensitive silver halide emulsion on a layer support and at least one color producing compound capable of releasing a diffusible dye on development and/or a second, light insensitive sheet material containing a layer of binder in which is incorporated a salt of a weakly acidic organic compound and a strong organic base is or are moistened with an aqueous liquid and the two sheet materials are then heated to 40.degree.-120.degree. C. with their coated surfaces in contact and subsequently separated.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.