Heat-sensitive recording material
Abstract
Abstract This invention provides a heat-sensitive recording material comprising a base sheet and a heat-sensitive record layer formed over the base sheet and comprising a colorless or pale-colored basic dye and a color developing material capable of forming a color when contacted with the dye, the recording material being characterized in that the heat-sensitive record layer comprises as the color developing material at least one compound represented by the formula <IMAGE> (I) wherein X is straight- or branched-chain alkylene group having 1 to 4 carbon atoms, R1, R2, R3, R4 and R5 are each hydrogen atom, halogen atom, alkyl group having 1 to 4 carbon atoms, alkoxy group having 1 to 4 carbon atoms, phenyl group or benzyl group, or R1 and R2+L, R2 and R3, and R4 and R5, when taken together, may form an aromatic ring, and when R4 and R5 taken together form an aromatic ring, the hydroxy group on the benzene ring to which R4 and R5 are attached may be substituted on the aromatic ring formed by R4 and R5.
Inventors
- 👤 Toshitake Suzuki
- 👤 Fumio Hama
- 👤 Mitsuru Kondo
Bibliographic Details
Claims Analysis
Total Claims: 4References Cited (Backward Citations)
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| 3.5 Years (Year 4) | 1989-12-29 | 1990-06-30 | 1990-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-29 | 1994-06-30 | 1994-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-29 | 1998-06-30 | 1998-12-30 | $7700.00 | Window Closed / Lapsed |