Diazonium salt and thermal recording material using the same
View Patent ↗A diazonium salt represented by the following general formula (1) and a thermal recording material using the diazonium salt: General Formula (1) wherein R 1 and R 2 each independently represents an alkyl group, an aryl group, an acyl group, an alkoxycarbonyl group or a carbamoyl group, and R 1 and R 2 may be linked each other to form a ring; and R 3 to R 6 each independently represents a hydrogen atom, a hydroxyl group, a halogen atom, an alkyl group, an aryl group, an alkoxy group, an aryloxy group, an alkylthio group, an arylthio group, an alkylsulfonyl group, an arylsulfonyl group or a diazonio group, and at least one of R 3 , R 4 , R 5 and R 6 represents the diazonio group.
1. A diazonium salt represented by the following general formula (3):
wherein R 1 and R 2 each independently represents an alkyl group, an aryl group, an acyl group, an alkoxycarbonyl group or a carbamoyl group, and R 1 and R 2 may be linked each other to form a ring; R 10 and R 11 each independently represents a hydrogen atom, a halogen atom, an alkyl group, an aryl group, an alkoxy group, an aryloxy group, an alkylthio group, an arylthio group, an alkylsulfonyl group or an arylsulfonyl group; R 12 represents a hydrogen atom, an alkyl group or an aryl group; and X − represents an anion.
2. A thermal recording material comprising, on a support, a thermal recording layer containing a coupler and a diazonium salt represented by the following general formula (3):
wherein R 1 and R 2 each independently represents an alkyl group, an aryl group, an acyl group, an alkoxycarbonyl group or a carbamoyl group, and R 1 and R 2 may be linked each other to form a ring; R 10 and R 11 each independently represents a hydrogen atom, a halogen atom, an alkyl group, an aryl group, an alkoxy group, an aryloxy group, an alkylthio group, an arylthio group, an alkylsulfonyl group or an arylsulfonyl group; R 12 represents a hydrogen atom, an alkyl group or an aryl group; and X − represents an anion.
3. The thermal recording material according to claim 2 , wherein the coupler is a compound represented by the following general formula (4) or a tautomer thereof:
E 1 -CH 2 -E 2 General formula (4)
wherein E 1 and E 2 each independently represents an electron withdrawing group, and E 1 and E 2 may be linked each other to form a ring.
4. The thermal recording material according to claim 2 , wherein the diazonium salt is encapsuled in microcapsules.
5. The thermal recording material according to claim 4 , wherein walls of the microcapsules include at least one of polyurethane and polyurea as a constituent.
6. The thermal recording material according to claim 2 , wherein the thermal recording layer includes an organic base.
7. The thermal recording material according to claim 6 , wherein the organic base is used in an amount of 0.1 to 30 parts by weigh with respect to 1 part by mass of the diazonium salt.
8. The thermal recording material according to claim 2 , wherein the thermal recording layer includes a color forming aid.
9. The thermal recording material according to claim 2 , wherein the thermal recording layer includes a free radical generating agent.
10. The thermal recording material according to claim 9 , wherein the free radical generating agent is used in an amount of 0.01 to5 parts by mass with respect to 1 part by mass of the diazonium salt.
11. The thermal recording material according to claim 2 , wherein the thermal recording layer includes a vinyl monomer.
12. The thermal recording material according to claim 11 , wherein the vinyl monomer is used in an amount of 0.2 to 20 parts by mass with respect to 1 part by mass of the diazonium salt.
13. The thermal recording material according to claim 2 , wherein at least one of a light transmittance control layer and a protective layer is disposed on the thermal recording layer.
14. The thermal recording material according to claim 2 , wherein the thermal recording layer includes the diazonium salt represented by the general formula (3) in an amount of 0.02 to 5 g/m 2 .