Thermal recording material
US6677275B1 · kind B1 · utility
0Cited by
4References
9Claims
0Family size
Assignee
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Key dates
| Filing date | Oct 31, 2000 |
| Grant date | Jan 13, 2004 |
| Priority date | — |
| Expiry date | Oct 31, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41M5/3275
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A thermally recording sheet which has high sensitivity in color development, satisfactory background heat resistance, and a satisfactory background color. The sheet contains a dihydroxydiphenylsulfone compound represented by general formula (1) as a color developer and a sulfonamide represented by general formula (2). In the formula, R1 and R2 each represents C1-8 alkyl, alkenyl, or halogeno; and a and b each is an integer of 0 to 3. In the formula, R3 represents C1-66 alkyl or electron-attracting group; and n is an integer of 0 to 2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.