Thermal imaging dye precursors

Details Thermal imaging dye precursors Thermal imaging dye precursors

1991-07-12

1995-06-13

Dees, Jose G.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

548209, 5483667, 5483684, 558 50, 558272, 564168, C07C27114, C07C27128

Patent

active

054244757

ABSTRACT:
Colorless precursors of preformed image dyes are provided which are useful as the color image-forming materials in thermal imaging systems. These colorless precursors possess at least one thermal protecting group that undergoes fragmentation upon heating and at least one leaving group that undergoes irreversible elimination upon heating, said protecting and leaving groups maintaining the precursor in its colorless form until heat is applied to effect removal of these groups whereby the precursor is converted to an image dye.

REFERENCES:
patent: 3409457 (1968-11-01), Menzel
patent: 4602263 (1986-07-01), Borror et al.
patent: 4720449 (1988-07-01), Borror et al.
James, T. H., The Theory of the Photographic Process, Fourth Edition, MacMillan Publishing Co., Inc., New York, May 1977, pp. 353-362.
T. W. Greene, Protective Groups in Organic Synthesis, John Wiley & Sons July (1981), p. vii. (Preface).

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