Recording material with improved image tone and or stability upo

Details Recording material with improved image tone and or stability upo Recording material with improved image tone and or stability upo

1999-06-01

2000-09-05

Chea, Thorl

Radiation imagery chemistry: process, composition, or product th

Thermographic process

Heat applied after imaging

430617, 430 68, 430619, 430620, G03C 1490

Patent

active

061141003

ABSTRACT:
A recording material comprising a support and a thermosensitive element comprising silver palmitate, an organic reducing agent therefor in thermal working relationship therewith and a binder, wherein the silver palmitate is not associated with mercury and/or lead ions and when the recording material is irradiated with a copper K.alpha..sub.1 X-ray source the ratio of the sum of the peak heights of the X-ray diffraction lines attributable to silver palmitate at Bragg angles, 2.THETA., of 4.01.degree., 6.049.degree., 8.031.degree., 10.06.degree., 12.08.degree. and 14.09.degree. to the sum of the peak heights of the X-ray diffraction lines at Bragg angles, 2.THETA., of 25.60.degree., 35.16.degree. and 43.40.degree. of NIST standard 1976, rhombohedral Al.sub.2 O.sub.3, determined with the same X-ray diffractometer in the same state of adjustment on a sample of the recording material and a sample of the NIST standard 1976 cut to fit a sample holder of the X-ray diffractometer, divided by the square root of the quantity of silver in the recording material, expressed in g per m.sup.2, is greater than 3.09 m/g.sup.0.5 ; and a process for producing particles of substantially light-insensitive organic silver salt comprising silver palmitate with these X-ray characteristics in the substantial absence of organic solvent.

REFERENCES:
patent: 5891616 (1999-04-01), Gilliams et al.

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