A phtalide compound and a near infrared absorber and a recording material each comprising the same compound
申请人:YAMAMOTO CHEMICALS, INC.
公开号:EP0664292A1
公开(公告)日:1995-07-26
A phthalide compound of general formula (I) and a near infrared absorber and a recording material each utilizing the phthalide compound are disclosed.
wherein ring A represents a substituent group of the following formula
where R₁ represents hydrogen, alkyl, alkoxy or halogen; n represents an integer of 1-3; ring B represents a defined aromatic ring; R₂ represents alkyl or aryl; R₃ represents alkyl; R₄ and R₅ independently represent alkyl or unsubstituted or substituted phenyl; R₆ represents hydrogen, alkyl or alkoxy.
The near infrared absorber and the recorded image on the recording material absorb strongly the near infrared region with no appreciable absorption in the visible region of the spectrum. The near infrared absorber is colorless or pale in color and yet highly capable of absorbing near infrared radiation. The recorded image on the recording material can hardly be read with the eye but can be read with the OCR. Moreover, the effect on the developed shade of any concomitant color former in a recording material is minimal.
本发明公开了通式(I)的邻苯二甲酸盐化合物以及利用该邻苯二甲酸盐化合物的近红外吸收剂和记录材料。
其中环 A 代表下式的取代基团
其中 R₁ 代表氢、烷基、烷氧基或卤素;n 代表 1-3 的整数;环 B 代表确定的芳环;R₂ 代表烷基或芳基;R₃ 代表烷基;R₄ 和 R₅ 独立地代表烷基或未取代或取代的苯基;R₆ 代表氢、烷基或烷氧基。
近红外吸收体和记录材料上记录的图像对近红外区域有强烈的吸收,而对光谱的可见光区域没有明显的吸收。近红外吸收体是无色或浅色的,但吸收近红外辐射的能力很强。记录材料上记录的图像几乎无法用肉眼读取,但可以用 OCR 读取。此外,记录材料中的任何伴色前者对显影色调的影响微乎其微。