Thermographic recording

US5750464A · kind A · utility

Assignee

• Polaroid Corporation · US

Inventors

• Edward J. Dombrowski · Asheboro, US
• Donna J. Guarrera · Addlestone, GB
• Robert L. Jones · Andover, US
• Mark R. Mischke · Arlington, US
• John C. Warner · Ithaca, US
• Jiyue Yang · Tangxia, CN

Key dates

• Filing date: Apr 22, 1997
• Grant date: May 12, 1998
• Expiry date: Apr 22, 2017

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B41M5/42
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

There is described a novel thermographic recording film, and more specifically, a novel image-forming system incorporated therein comprising at least one layer and including and a Lewis acid material, a di- or triarylmethane thiolactone dye precursor, an acidic organic material, a binder and a thermal stabilizer. Thermographic recording films comprising the novel image-forming system of the present invention exhibit excellent thermal stability, and desirable minimum optical densities, indicative of substantially less premature image development at elevated environmental temperatures. Embodiments of the invention wherein the thermographic recording films further include a light insensitive organic silver salt, a reducing agent, a binder and, preferably, a toning agent, show substantially enhanced image density.