Direct thermal imaging material containing a protective layer

US5759752A · kind A · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• Carlo Uyttendaele · Berchem, BE
• Geert Defieuw · Kessel-Lo, BE

Key dates

• Filing date: Nov 29, 1995
• Grant date: Jun 2, 1998
• Expiry date: Nov 29, 2015

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S428/913
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A thermosensitive recording material suited for use in direct thermal imaging by means of an information-wise energized heating element, said recording material containing a thermosensitive recording layer of which the optical density is changed by heat, characterized in that said recording layer is coated with a protective transparent resin layer essentially consisting of a polycarbonate or copolycarbonate derived from one or more bisphenols, wherein at least 25 mole % of said bisphenols consists of a bis-(hydroxyphenyl)-cycloalkane corresponding to following general formula (I): ##STR1## wherein: each of R.sup.1, R.sup.2 , R.sup.3, and R.sup.4 (same or different) represents hydrogen, halogen, a C.sub.1 -C.sub.8 alkyl group, a substituted C.sub.1 -C.sub.8 alkyl group, a C.sub.5 -C.sub.6 cycloalkyl group, a substituted C.sub.5 -C.sub.6 cycloalkyl group, a C.sub.6 -C.sub.10 aryl group, a substituted C.sub.6 -C.sub.10 aryl group, a C.sub.7 -C.sub.12 aralkyl group, or a substituted C.sub.7 -C.sub.12 aralkyl group, and PA1 X represents the atoms necessary to complete a 5- to 8-membered alicyclic ring, which either carries at least one C.sub.1 -C.sub.6 alkyl group or at least one 5- or …