New phthalide derivatives, process for preparing the same and recording system utilizing the same as colourless chromogenic material
申请人:KANZAKI PAPER MANUFACTURING COMPANY
LIMITED
公开号:EP0062544A1
公开(公告)日:1982-10-13
A new phthalide derivative useful as a colourless chromogenic material has the general formula:
一种可用作无色显色材料的新邻苯二甲酸酯衍生物的通式为