| 摘要 |
PURPOSE:To make a thermal recording medium suited for fast recording and make a recorded image stable under high temperature and high humidity conditions as well as control the unnecessary generation of fog on a blank space by adding a specific diglycidyl compound to a thermal recording layer. CONSTITUTION:A thermal recording medium comprising a leuco compound, an organic acid which colors through a reaction with the leuco compound and a binder contains a diglycidyl compound expressed by formula(I) as a shelf life modifier in the thermal recording layer of the medium. In the formula(I), Ar is a phenyl group, a diphenyl group or a naphthyl group. The preferable content of the compound(I) is 1 to 30% of the total solid portion of the thermal recording layer. A paint for the thermal recording layer is prepared by crushing the leuco compound, the organic acid, the compound(I) as a shelf life modifier and, if necessary, additives such as pigment, sensitivity conditioner, in an aqueous medium containing a binder of any appropriate concentration such as polyvinylalcohol, using a crusher such as a ball mill or a sand grinder. |
