Radiation imagery chemistry: process – composition – or product th – Dye image from radiation sensitive dye or dye former by dry... – Composition or product
Patent
1991-07-12
1993-03-09
Bowers, Jr., Charles L.
Radiation imagery chemistry: process, composition, or product th
Dye image from radiation sensitive dye or dye former by dry...
Composition or product
430202, 430332, 430343, 430348, 430944, 430964, G03C 172
Patent
active
051926458
ABSTRACT:
A thermal imaging method for forming color images is provided which employs as the color image-forming material, a colorless precursor of a preformed image dye possessing 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.
T. W. Greene, Protective Groups in Organic Synthesis, John Wiley & Sons (1981) p. vii.
Boggs Roger A.
Borror Alan L.
Conlon Patrick R.
Cournoyer Richard L.
Ellis Ernest W.
Bowers Jr. Charles L.
Chea Thorl
Loeschorn Carol A.
Polaroid Corporation
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