申请人:Nippon Paper Industries Co., Ltd.
公开号:EP3763537A1
公开(公告)日:2021-01-13
Provided is a thermosensitive recording medium, which is excellent in color developing property, especially excellent in bar code readability, under severe environment, further, excellent in resistance to discoloration under severe environment. That is a thermosensitive recording medium having a thermosensitive recording layer comprising a colorless or pale colored electron donating leuco dye and an electron accepting color developing agent on a substrate, wherein the thermosensitive recording layer comprises, as the electron accepting color developing agent, a specific sulfone compound and a phenolic compound in a specific ratio, wherein the phenolic compound contains two or more hydroxyl groups and two or more diphenylsulfone backbone but contains neither urethane bond nor urea bond. The thermosensitive recording layer optionally may further comprise a specific urea-urethane-based compound.
本发明提供了一种热敏记录介质,它在恶劣环境下具有优异的显色性,特别是条形码可读性,而且在恶劣环境下具有优异的抗变色性。这是一种热敏记录介质,其热敏记录层由无色或浅色的电子供体染料和电子受体显色剂组成,热敏记录层的基底上有一个热敏记录层,其中,作为电子受体显色剂,热敏记录层由特定比例的砜类化合物和酚类化合物组成,其中,酚类化合物含有两个或两个以上的羟基和两个或两个以上的二苯基砜骨架,但不含氨基甲酸酯键或脲键。热敏记录层可选择进一步包含特定的脲-脲基化合物。