Stabilized vinyl sulfone hardening compositions useful in photographic manufacturing

US5658721A · kind A · utility

Assignee

• EASTMAN KODAK COMPANY · US

Inventors

• Mary Jane Griggs · Webster, US
• Lewis R. Hamilton · Rochester, US
• Peter Marr · Bochum, DE
• Philip Raymond Martell · Rochester, US

Key dates

• Filing date: Dec 21, 1995
• Grant date: Aug 19, 1997
• Expiry date: Dec 21, 2015

Classification

• Technology area (CPC G): Physics
• CPC primary: G03C1/30
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

Hydrophilic colloids, such as gelatin, which are employed in the manufacture of photographic elements are commonly treated with a hardening composition, among the most useful of which are hardening compositions containing vinyl sulfone hardening agents such as bis(vinylsulfonyl)methane. In accordance with this invention, citric acid or salts of citric acid are utilized as an effective inhibitor of homopolymerization in such hardening compositions.