Patent · US Expired

Incorporation process

US4003748A · kind A · utility

7Cited by

5References

8Claims

0Family size

Assignee

AGFA-Gervaert AG · DE

Inventors

Hans Langen · Frechen, DE
Erwin Ranz · Leverkusen, DE
Rudolf Meyer · Leverkusen, DE
Johannes Sobel · Leverkusen, DE

Key dates

Filing date	Mar 3, 1975
Grant date	Jan 18, 1977
Priority date	—
Expiry date	Mar 3, 1995

Classification

Technology area (CPC G)Physics
CPC primaryG03C7/3885
WIPO fieldOptics
WIPO sectorInstruments

Abstract

A photographic silver halide material with at least one halide emulsion layer and at least one substance in heterogeneous contribution emulsified in oilformer compounds and a process of preparing the said photographic silver halide materials. The substances are introduced into photographic emulsions prior to coating by way of adding a hydrophilic phase containing in emulsified form the substances which are emulsified in the hydrophilic phase in form of a solution containing at least one substantially diffusion-resistant, substantially water-insoluble, substantially non-coupling dispersible .beta.-diketo compound with at least 9 carbon atoms, .beta.-keto carboxylic acid ester, .beta.-keto carboxylic acid amide, cyanoacetyl compound or .beta.-dicarboxylic acid ester with at least 13 carbon atoms as oilformer. The photographic material shows advantageous results i.a. with respect of stability of the emulsified substances in the layers and excellent sensitometric results.

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