EP 0543136 B1 19980513 - Stabilization of thermal images
Title (en)
Stabilization of thermal images
Title (de)
Stabilisierung von thermischen Bildern
Title (fr)
Stabilisation d'images thermiques
Publication
Application
Priority
- US 79510191 A 19911120
- US 79510291 A 19911120
Abstract (en)
[origin: EP0543136A1] The addition, to a thermal imaging medium comprising a color-forming compound which undergoes a change of color upon heating above a color-forming temperature for a color-forming time, the color-forming compound being of the cyclic sulfonamide type described in US-A-4 720 449 and 4 960 901, of a color-stabilizing additive, comprising any one or more of a quinone, a hydroquinone and a source of zinc, nickel, copper(II), cobalt(II) or aluminum(III) cations, increases the sensitivity of the imaging medium and helps to prevent fading of images produced therefrom while the images are being projected. <IMAGE>
IPC 1-7
IPC 8 full level
B41M 5/323 (2006.01); B41M 5/337 (2006.01); G03C 1/498 (2006.01); G03C 8/40 (2006.01)
CPC (source: EP)
B41M 5/323 (2013.01); B41M 5/3375 (2013.01)
Designated contracting state (EPC)
DE FR GB NL SE
DOCDB simple family (publication)
EP 0543136 A1 19930526; EP 0543136 B1 19980513; CA 2080098 A1 19930521; DE 69225461 D1 19980618; DE 69225461 T2 19981001; JP 3155381 B2 20010409; JP H05232621 A 19930910
DOCDB simple family (application)
EP 92117365 A 19921010; CA 2080098 A 19921007; DE 69225461 T 19921010; JP 31244592 A 19921120