Crystals of fluoran compound, crystalline solvates thereof, process for their preparation and recording material comprising said crystal or said solvate

摘要

Disclosed are a crystal and crystalline solvate of a fluoran compound represented by the formula <IMAGE> wherein R1 is <IMAGE> <IMAGE> and which are useful as chromogenic compounds in recording materials such as pressure-sensitive and heat-sensitive recording materials, a process for preparation of said crystal and said crystalline solvate, and recording materials comprising said crystal or said crystalline solvate.