Preparation of thin tabular grain silver halide emulsions using synthetic polymeric peptizers

US5385819A · kind A · utility

Assignee

• EASTMAN KODAK COMPANY · US

Inventors

• Wayne A. Bowman · Walworth, US
• Roger A. Weiss · Webster, US
• Gerald W. Klein · Pittsford, US
• John E. Keevert, Jr. · Rochester, US
• Shane Weber · Woodbridge, US

Key dates

• Filing date: Dec 22, 1993
• Grant date: Jan 31, 1995
• Expiry date: Dec 22, 2013

Classification

• Technology area (CPC G): Physics
• CPC primary: G03C2001/0055
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A process for preparing a thin tabular grain silver halide emulsion comprised of silver halide grains which have a halide content of at least 50 mole percent bromide, wherein tabular grains of less than 0.15 micrometers in thickness and having an aspect ratio of greater than 8 account for greater than 50 percent of the total grain projected area, comprises the steps of nucleating the silver halide grains with a gelatino-peptizer or with the use of certain synthetic polymers that serve as effective nucleation peptizers and then growing the silver halide grains with the use of either a gelatino-peptizer or certain synthetic polymers that serve as effective growth peptizers.