HYDROXYPHENYLHYDROXY- ALKYLAMIDES, REVERSIBLE THERMO- SENSITIVE COMPOSITIONS AND REVERSIBLE THERMAL PRINTING MATERIALS CONTAINING THEM, AND COLOR DEVELOPING AND REDUCING PROCESS WITH THE SAME

摘要

The invention provides novel hydroxyphenylhydroxy- alkylamides; reversible thermosensitive compositions and reversible thermal printing materials which contain the amides and are excellent in stability of color development, erasability, sensitivity of color development, the balance between color developing temperature and erasing temperature, and thermal stability of the colored state in storage; and a color developing and reducing process with the amides, more specifically, hydroxyphenylhydroxyalkylamides represented by the general formula (I); and reversible thermosensitive compositions and reversible thermal printing materials which each contain both an electron-accepting compound as described above and an electron-donating color-forming compound: (I) (wherein n is an integer of 1 to 3; and A is straight-chain hydroxyalkyl having a hydroxyl group on a non-terminal carbon atom). The printing materials can cause color development or erasing by temperature control.