Thermorecording

Details Thermorecording Thermorecording

1975-06-17

1977-01-25

Kelley, Mary F.

Gas separation: apparatus

Electric field separation apparatus

Electrode cleaner, apparatus part flusher, discharger, or...

96 28, G03C 500, G03C 1112

Patent

active

040049248

ABSTRACT:
A process for reproducing an original having visible light absorptive image markings on a light transparent background by exposing to visible light passing through the original a normally water-removable heat-sensitive recording layer which consists essentially of a hydrophilic water-removable binder having generally homogeneously distributed therethrough finely divided particles of a hydrophobic thermoplastic polymer normally solid at room temperature together with finely divided material capable of absorbing visible light and converting it into heat and is otherwise generally transparent. The exposure is for a time lasting no longer than 10.sup.-.sup.1 second to visible light of an intensity of at least 0.3 watt, sec. per sq.cm. and sufficient to heat the areas of the layer corresponding to the transparent background areas of the original to reduce the water removability thereof but not sufficient to heat the areas of the layer corresponding to the image areas of the original to reduce the water removability thereof. The exposed layer is washed with an aqueous liquid to remove the areas corresponding to the image areas.

REFERENCES:
patent: 3476937 (1969-11-01), Vrancken

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