Heat sensitive materials including a hexaarylbiimidazole...

Details Heat sensitive materials including a hexaarylbiimidazole... Heat sensitive materials including a hexaarylbiimidazole...

G - Physics

03

C

96/117, 96/174,

G03C 1/498 (2006.01) B41M 5/28 (2006.01) G03C 1/83 (2006.01)

Patent

CA 1116003

Abstract Or the Disclosure A heat bleachable material comprises (i) at least one hexaarylbiimidazole with (ii) at least one dye, especially an antihalatlon or filter dye, that is reactive with the product of the hexaarylbiimidazole formed upon heating the material to a temperature above about 90°C. This provides a material that becomes at least 40% colorless within about 20 minutes, typically within about 30 seconds, upon heating to a temperature as described. The dye-containing material is especially useful for antihalation and filter purposes in a photographic element. The material can be a heat bleachable dye layer of a photothermographic element. The heat bleachable dye layer can also be useful in a thermographic element.

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