Toning agents for use in thermographic recording materials
View Patent ↗A thermographic recording material comprising a support and a thermosensitive element, the thermosensitive element comprising at least one substantially light-insensitive organic silver salt, at least one organic reducing agent therefor in thermal working relationship therewith, at least one binder and at least one toning agent represented by formula (I): wherein X represents the optionally substituted atoms necessary to form a 6-membered ring.
1. A thermographic recording material comprising a support and a thermosensitive element, said thermosensitive element comprising a substantially light-insensitive organic silver salt, an organic reducing agent therefor in thermal working relationship therewith, a binder and at least one toning agent, wherein said at least one toning agent is represented by formula (I):
wherein X represents an optionally substituted —O—C═C— group with the oxygen atom directly bonded to the sulphur atom of the sulphonyl group.
2. The thermographic recording material according to claim 1 , wherein said thermographic recording material is a black and white thermographic recording material.
3. The thermographic recording material according to claim 1 , wherein said thermographic recording material is a monosheet thermographic recording material.
4. The thermographic recording material according to claim 1 , wherein said thermosensitive element further comprises photosensitive silver halide.
5. The thermographic recording material according to claim 1 , wherein said thermographic recording material is a substantially light-insensitive thermographic recording material.
6. A thermographic recording material comprising a support and a thermosensitive element, said thermosensitive element comprising a substantially light-insensitive organic silver salt, an organic reducing agent therefor in thermal working relationship therewith, a binder and at least one toning agent wherein said at least one toning agent is represented by formula (I):
wherein X represents a —O—R 1 C═CR 2 — group with the oxygen atom directly bonded to the sulphur atom of the sulphonyl group and R 1 and R 2 are independently hydrogen, halogen or an optionally substituted alkyl, aryl, alkoxy, aryloxy, acyl or nitrile group; or R 1 and R 2 together represent the atoms necessary to form a alicyclic, aryl, heterocyclic or heteroaromatic ring system.
7. Thermographic recording material according to claim 6 , wherein said thermographic recording material is a black and white thermographic recording material.
8. Thermographic recording material according to claim 6 , wherein said thermographic recording material is a monosheet thermographic recording material.
9. Thermographic recording material according to claim 6 , wherein said thermosensitive element further contains photosensitive silver halide.
10. Thermographic recording material according to claim 6 , wherein said thermographic recording material is a substantially light-insensitive thermographic recording material.
11. A thermographic recording material comprising a support and a thermosensitive element, said thermosensitive element comprising a substantially light-insensitive organic silver salt, an organic reducing agent therefor in thermal working relationship therewith, a binder and at least one toning agent, wherein said at least one toning agent is represented by formula (I):
wherein X is
12. Thermographic recording material according to claim 11 , wherein said thermographic recording material is a black and white thermographic recording material.
13. Thermographic recording material according to claim 11 , wherein said thermographic recording material is a monosheet thermographic recording material.
14. Thermographic recording material according to claim 11 , wherein said thermosensitive element further contains photosensitive silver halide.
15. Thermographic recording material according to claim 11 , wherein said thermographic recording material is a substantially light-insensitive thermographic recording material.
16. A thermographic recording material comprising a support and a thermosensitive element, said thermosensitive element comprising a substantially light-insensitive organic silver salt, an organic reducing agent therefor in thermal working relationship therewith, a binder and at least one toning agent, wherein said at least one toning is selected from the group consisting of
17. Thermographic recording martial according to claim 16 , wherein said thermographic recording material is a black and white thermographic recording material.
18. Thermographic recording material according to claim 16 , wherein said thermographic recording material is a monosheet thermographic recording material.
19. Thermographic recording material according to claim 16 , wherein said thermosensitive element further contains photosensitive silver halide.
20. Thermographic recording material according to claim 16 , wherein said thermographic recording material is a substantially light-insensitive thermographic recording material.
21. A process using compounds represented by formula (I):
as toning agents in imaging processes involving the formation of silver particles comprising the steps of: providing a thermographic recording material: imagewise heating or imagewise exposure followed by uniform heating of said imagewise exposed thermographic recording material, wherein X represents a —O—R 1 C═CR 2 — group with the oxygen atom directly bonded to the sulphur atom of the sulphonyl group and R 1 and R 2 are independently hydrogen, halogen or an optionally substituted alkyl, aryl, alkoxy, aryloxy, acyl or nitrile group; or R 1 and R 2 together represent the atoms necessary to form a alicyclic, aryl, heterocyclic or heteroaromatic ring system.
22. A thermographic recording material comprising a support and a thermosensitive element, said thermosensitive element containing a substantially light-insensitive organic silver salt, an organic reducing agent therefor in thermal working relationship therewith, a binder and at least one toning agent, wherein said at least one toning agent is a substituted or unsubstituted 3,4-dihydro-1,2,3-oxathiaz-4-one 2,2-dioxide.
23. Thermographic recording material according to claim 22 , wherein said thermographic recording material is a monosheet thermographic recording material.
24. Thermographic recording material according to claim 22 , wherein said thermographic recording material is a black and white thermographic recording material.
25. Thermographic recording material according to claim 22 , wherein said thermosensitive element further contains photosensitive silver halide.
26. Thermographic recording material according to claim 22 , wherein said thermographic recording material is a substantially light-insensitive thermographic recording material.