Claims
- 1. A recording material comprising at least one thermosensitive element, comprising a layer comprising at least one substantially light-insensitive organic silver salt in at least one binder and in thermal working relationship therewith an organic reducing agent therefor, on a support, characterized in that said recording material is light-insensitive and said layer contains colloidal particles comprising silicon dioxide at a coating weight given by expression (1): ##EQU6## wherein B represents the total weight of all binders in said layer, AGOS represents the total weight of all organic silver salts in said layer and S represents the weight of said colloidal particles in said layer.
- 2. A recording material according to claim 1, wherein said layer contains colloidal particles comprising silicon dioxide at a coating weight given by expression (2): ##EQU7## wherein B represents the total weight of all binders in said layer, AGOS represents the total weight of all organic silver salts in said layer and S represents the weight of said colloidal particles in said layer.
- 3. A recording material according to claim 1, wherein said layer contains said colloidal particles at a coating weight given by expression (3): ##EQU8## wherein B represents the total weight of all binders in said layer, AGOS represents the total weight of all organic silver salts in said layer and S represents the weight of said colloidal particles in said layer.
- 4. A recording material according to claim 1, wherein said colloidal particles are hydrophobized.
- 5. A recording material according to claim 1, wherein said colloidal particles have a specific surface area greater than 100 m.sup.2 /g.
- 6. A recording material according to claim 1, wherein said recording material has a haze value, determined according to ASTM standard D1003 procedure B, of less than 35%.
- 7. A recording material according to claim 1, wherein said thermosensitive element comprises in addition at least one polycarboxylic acid and/or anhydride thereof in a molar percentage of at least 20 with respect to all said organic silver salt(s) present and in thermal working relationship therewith.
- 8. A recording material according to claim 1, wherein said substantially light-insensitive organic silver salt is a substantially light-insensitive fatty acid silver salt.
- 9. A thermal image forming process for producing high contrast images comprising the steps of: (i) bringing an outermost layer of a recording material comprising at least one thermosensitive element, comprising a layer comprising a substantially light-insensitive organic silver salt in at least one binder and in thermal working relationship therewith an organic reducing agent therefor, on a support; (2) applying heat from a heat source image-wise to said recording material while maintaining mutual contact to said heat source; and (3) separating said recording material from said heat source, characterized in that said recording material is light-insensitive and said layer contains colloidal particles comprising silicon dioxide at a coating weight given by expression (1): ##EQU9## wherein B represents the total weight of all binders in said layer, AGOS represents the total weight of all organic silver salts in said layer and S represents the weight of colloidal particles in said layer.
- 10. A thermal image forming process according to claim 9, wherein said heat source is a thermal head.
Priority Claims (1)
Number |
Date |
Country |
Kind |
95203634 |
Dec 1995 |
EPX |
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Parent Case Info
This application is a continuation of Provisional application Ser. No. 60/011,313, filed Feb. 8, 1996.
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Number |
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Country |
7525962 |
Mar 1976 |
FRX |
193035 |
Oct 1979 |
PLX |
Non-Patent Literature Citations (2)
Entry |
Korczynski, Andrzej, et al., "Heat-sensitive paper for obtaining black-and-white reproductions," Radiation Chem., Photochem. 91:58 (1979) (Abstract only). |
English abstract to French Patent Application No. 75 25962, published Mar. 19, 1976. |