Silver-free black-and-white thermographic materials

Details Silver-free black-and-white thermographic materials Silver-free black-and-white thermographic materials

2005-11-08

2005-11-08

Chea, Thorl (Department: 1752)

Radiation imagery chemistry: process, composition, or product th

Imaged product

Nonsilver image

C430S003000, C430S203000, C430S250000, C430S332000, C430S343000, C430S541000, C430S549000, C430S955000, C430S957000, C430S964000, C503S222000

Reexamination Certificate

active

06962763

ABSTRACT:
Silver-free, aqueous-based direct thermographic materials are designed to have image tone with near neutral density. Without the use of organic silver salts containing reducible silver ions, the image is formed using a color developing agent precursor that releases a color developing agent when heated to a temperature of at least 80° C., a combination of cyan, yellow and magenta dye-forming color couplers that provide cyan, yellow, and magenta dyes, and a hindered-amine N-oxyl as an oxidizing agent. No silver metal or silver ions are purposely added to these materials. This combination of components provides a means for controlling image tone without reliance upon conventional toning agents.

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