Claims
- 1. In a method of preparing a heat developable light-sensitive material comprising on a support at least one layer containing (a) an organic silver salt; (b) a light-sensitive silver halide; (c) a reducing agent; and (d) a binder; the improvement which comprises increasing the sensitivity of and improving the gradation of said light-sensitive material by decomposing a N-halo compound in the presence of the organic silver salt (a) and an alcohol for reaction with the organic silver salt (a) to produce the light-sensitive silver halide (b) before applying the layer on the support.
- 2. The method of claim 1, wherein the organic silver salt is a silver salt of an organic compound containing a carboxyl group, a hydroxyl group, and imino group or a mercapto group.
- 3. The method of claim 1, wherein said N-halo compound comprises the combination of N-iodosuccinimide and one of N-bromosuccinimide, N-bromophthalimide, 1-bromo-3,5,5'-trimethyl-2,4-imidazolidinedione, or 1,3-dibromo-5,5-dimethyl-2,4-imidazolidinedione.
- 4. The method of claim 1, wherein the N-halo compound is at least one compound represented by General Formula (I) ##STR11## wherein X represents a halogen atom and Z represents an atomic group necessary for forming a 5-membered ring or a 6-membered ring.
- 5. The method of claim 4, wherein said N-halo compound is N-bromophthalazone.
- 6. The method of claim 1, wherein the N-halo compound is at least one compound represented by the General Formula (II) ##STR12## wherein R.sub.1 represents an alkyl group, an aryl group or an alkoxy group, R.sub.2 represents a hydrogen atom, an alkyl group, an aryl group or an alkoxy group, A represents a carbonyl group or a sulfonyl group, and X represents a halogen atom.
- 7. The method of claim 6, wherein said N-halo compound is N-bromosuccinimide.
- 8. The method of claim 6, wherein said N-halo compound is N-bromophthalimide.
- 9. The method of claim 6, wherein said N-halo compound is N-bromoacetamide.
- 10. The method of claim 1, wherein the N-halo compound is at least one halogenated melamine.
- 11. The method of claim 10, wherein said N-halo compound is 1-bromo-3,5,6'-trimethyl-2,4-imidazolidinedione.
- 12. The method of claim 10, wherein said N-halo compound is 1,3-dibromo-5,5-dimethyl-2,4-imidazolidinedione.
- 13. The method of claim 1, wherein the N-halo compound is decomposed until a merocyanine dye in the presence of the N-halo compound is no longer decolored.
- 14. The method of claim 1, wherein the alcohol is a primary alcohol or a secondary alcohol.
- 15. The method of claim 14, wherein the alcohol is a liquid at about 30.degree. C.
- 16. The method of claim 15, wherein the alcohol is an aliphatic alcohol having 1 to 8 carbon atoms, an alicyclic alcohol having 5 to 10 carbon atoms, an aromatic alcohol having 7 to 12 carbon atoms or a heterocyclic alcohol having 5 to 10 carbon atoms.
- 17. The method of claim 1, wherein the N-halo compound is decomposed at a temperature of about 0.degree. C. to about 80.degree. C.
- 18. The method of claim 17, wherein the N-halo compound is decomposed at a temperature of 30.degree. C. to 65.degree. C.
- 19. The method of claim 17, wherein the N-halo compound is decomposed at a temperature of 40.degree. C. to 55.degree. C.
- 20. The method of claim 19, wherein the N-halo compound is heated and decomposed at 40.degree. C. to 55.degree. C. for 30 minutes to 3 hours in the presence of the organic silver salt (a).
- 21. The method of claim 1, wherein the N-halo compound is present in a proportion of about 0.1 to 30 mol % based on the total silver quantity.
- 22. The method of claim 21, wherein said N-halo compound is present in an amount of 0.5 to 20 mol % based on the total silver quantity.
- 23. The method of claim 1, wherein the N-halo compound is an N-bromo compound.
- 24. The method of claim 1, wherein said N-halo compound comprises at least about 30 mol % or more of an N-bromo compound.
- 25. The method of claim 24, including an N-iodo compound an N-chloro compound or a mixture thereof in an amount less than 50 mol %.
- 26. The method of claim 24, wherein said N-bromo compound is present in an amount of more than 40 mol % and including an N-chloro compound in an amount of less than 60 mole %.
- 27. The method of claim 24, wherein said N-bromo compound is present in an amount of more than 50 mol % and including an N-iodo compound in an amount of less than 50 mol %.
- 28. The method of claim 24, wherein said N-halo compound comprises an N-bromo compound and an N-iodo compound.
- 29. The method of claim 1, further containing a color toning agent.
- 30. The method of claim 29, wherein the color toning agent is phthalazinone.
- 31. The method of claim 1, further containing a sensitizing dye.
- 32. The method of claim 1, wherein the organic silver salt is a silver salt of an aliphatic carboxylic acid having 10 or more carbon atoms.
- 33. The method of claim 1, wherein said N-halo compound is N-iodosuccinimide and one of N-bromosuccinimide, N-bromophthalimide, N-bromoacetamide, or N-bromophthalazone.
Priority Claims (2)
Number |
Date |
Country |
Kind |
49/19760 |
Feb 1974 |
JPX |
|
49/126658 |
Nov 1974 |
JPX |
|
Parent Case Info
This is a continuation of application Ser. No. 522,963, filed Nov. 11, 1974, now abandoned.
US Referenced Citations (5)
Foreign Referenced Citations (1)
Number |
Date |
Country |
2402161 |
Jul 1974 |
DEX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
522963 |
Nov 1974 |
|