Stabilization of thermal images

Details Stabilization of thermal images Stabilization of thermal images

B - Operations, Transporting

41

M

B41M 5/28 (2006.01) B41M 5/323 (2006.01) B41M 5/337 (2006.01)

Patent

CA 2080098

C-7699/7715 STABILIZATION OF THERMAL IMAGES Abstract of the Disclosure 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 U.S. Patents Nos. 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.

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