Photosensitive polyphosphate comprising Ag and Cl
AssigneeCorning Glass Works
InventorChe-Kuang Wu
Life of this patent
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Abstract
A photosensitive material in the form of a silver and chlorine-containing polyphosphate which exhibits permanent visible darkening on exposure to ultraviolet or short wavelength visible light, is described.
Claims3
A photosensitive polyphosphate comprising Ag and Cl which is produced by:
- (a) condensing a mixture comprising KH.sub.2 PO.sub.4 and Ag.sub.3 PO.sub.4 in weight ratio (KH.sub.2 PO.sub.4 :Ag.sub.3 PO.sub.4) in the range of about 50:1 to 1:1 to cause water evolution and the formation of a solid or liquid condensation product therefrom;
- and
- (b) reacting the condensation product of (a) with dissolved NaCl to provide a photosensitive polyphosphate product.
A method of making a photosensitive material which comprises the steps of reacting KH.sub.2 PO.sub.4 with Ag.sub.3 PO.sub.4 in proportions of 1-50 parts KH.sub.2 PO.sub.4 for each part Ag.sub.3 PO.sub.4 by weight to cause water evolution and the formation of a solid or liquid condensation product therefrom, and reacting the condensation product with dissolved NaCl to provide a photosensitive polyphosphate product.
A photosensitive medium comprising a coating of a photosensitive polyphosphate on a support, wherein the photosensitive polyphosphate is produced by:
- (a) condensing a mixture comprising KH.sub.2 PO.sub.4 and Ag.sub.3 PO.sub.4 in a weight ratio (KH.sub.2 PO.sub.4 :Ag.sub.3 PO.sub.4) in the range of about 50:1 to 1:1 to cause water evolution and the formation of a solid or liquid condensation product therefrom, and (b) reacting the condensation product with dissolved NaCl to provide a photosensitive polyphosphate product.
Dependencies are inferred from the claim text.