Toner developed electrostatic imaging process for outdoor signs

US5262259A · kind A · utility

Assignee

• Minnesota Mining and Manufacturing Company · US

Inventors

• Hsin-hsin Chou · Woodbury, US
• John F. Eisele · Lakeland, US
• Gaye K. Lehman · Lauderdale, US
• Wu-Shyong Li · Woodbury, US
• Valdis Mikelsons · Mendota Heights, US
• Michael J. Petrich · Lake Elmo, US
• Prabhakara S. Rao · Maplewood, US
• Thomas J. Staiger · Hastings, US
• Paul J. Wang · Saratoga, US
• Gregory L. Zwaldo · Ellsworth, US
• Michael G. Baier · Maplewood, US
• Richard H. Olson · Highlands Ranch, US

Key dates

• Filing date: Apr 18, 1990
• Grant date: Nov 16, 1993
• Expiry date: Apr 18, 2010

Classification

• Technology area (CPC G): Physics
• CPC primary: G03G13/01
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

An electrographic imaging process is described in which electrostatic images are toned in sequence to form a multicolor intermediate image on a temporary dielectric receptor. The intermediate image is then transferred to a permanent receptor. Certain relative properties of the toner and the intermediate image, such as surface energy, T.sub.g, work of adhesion, and complex dynamic viscosity, have been found to be important to the production of good final images.