| 摘要 |
PURPOSE:To lower the start temperature of a color producing reaction and obtain an excellent sensitizing effect with a smaller amounts of materials, by incorporating a specified carbonic acid diester as a sensitizer in a color producing layer of a heat-sensitive recording sheet. CONSTITUTION:A carbonic acid diester of the formula (wherein each of R1 and R2 is a methyl group, a ethyl group or a propyl group; n is 0-2) is incorporated into the heat-sensitive color producing layer comprising a well-known colorless or light-colored basis dye and an organic color developer such as a phenol. 3-10 parts of the organic developer and 0.5-1 part of the diester are used per 1 part of the dye. After pulverizing these materials by a mill or the like, 1-20 parts of a filler and 10-25 parts (based on the total amount of solids) of a binder are added thereto together with other additives, and the resultant coating liquid is applied to a paper, a film or the like to obtain the heat-sensitive recording sheet. |
