申请人:SHOWA DENKO KABUSHIKI KAISHA
公开号:EP0468465A1
公开(公告)日:1992-01-29
The present invention relates to a near infrared ray-decolorizable recording material comprising a near infrared ray-absorbing cationic dye-borate anion complex having the formula (I):
wherein D represents a cationic dye having absorptions in the near infrared region; R1, R2, R3, and R4 independently represent an alkyl, aryl, alkaryl, allyl, aralkyl, alkenyl, alkynyl, silyl, alicyclic, or saturated or unsaturated heterocyclic group, substituted alkyl, substituted aryl, substituted alkaryl, substituted allyl, substituted aralkyl, substituted alkenyl, substituted alkynyl, or substituted silyl, with the proviso that at least one of Ri, R2, R3, and R4 represents an alkyl group having 1 to 8 carbon atoms.
本发明涉及一种可在近红外线下脱色的记录材料,该材料由具有式(I)的近红外线吸收阳离子染料硼酸盐阴离子络合物组成:
其中 D 代表在近红外区域具有吸收性的阳离子染料;R1、R2、R3 和 R4 独立地代表烷基、芳基、烷芳基、烯丙基、芳烷基、烯基、炔基、硅基、脂环族或饱和或不饱和杂环族基团、取代的烷基、取代的芳基、取代的烷芳基、取代的烯丙基、取代的芳烷基、取代的烯基、取代的炔基或取代的硅基,但 Ri、R2、R3 和 R4 中至少有一个代表具有 1 至 8 个碳原子的烷基。