| 摘要 |
PURPOSE:To obtain a thermal recording paper with a high whiteness, preservability and stability free from blackening effect caused by a contact with thiazo photosensitive paper, by employing at least one kind of specific diphenyl thio compounds as a developer. CONSTITUTION:In a thermal recording material consisting of a color developing substance, a developer and a binder, at least one kind of diphenyl thio compounds expressed by the general formula is used as a developer. In this formula, methyl, ethyl, propyl, butyl, amyl and hexyl groups re mentioned as alkyl groups. In addition, a benzyl group and others which normally have a carbon number of 10 or less are employed as an aralkyl group. Further a substituent such as halogen or alkyl group may be contained in the phenyl nucleus of the aralkyl group. Also the right and left R1 groups may be the same or different. If n and q represent an integer of 2 or more, the R1 groups are not necessarily the same substituents. For instance, if n represents 2, one R1 may be a methyl group, while the other R1 may be a propyl group. |
