| 摘要 |
Pressure sensitive record material uses a 2,3-disubstituted-1,2,3,4-tetrahydroquinazolin-4-ones of the formula (I): <IMAGE> (I) where R1 and R2 have defined meanings, as color formers. Preferred compounds of formula (I) are intense fade resistant and stable yellow color formers useful in making black copy formulations. |
