| 摘要 |
<p>There is described a negative charge control agent for use in electroreprography which comprises one or more pyrimidines of Formula (I), which includes all electroreprographically effective forms of such compounds selected from one or more of the following (including mixtures thereof and combination thereof in the same species): stereoisomers, zwitterions, polymorphs, solvates, isotopic forms; and salts thereof; where in Formula (I): R1 represents a substituent selected from one or more of: H, hydroxy, mercapto, amino, nitro, sulpho, sulpheno, sulphino, carboxy, halo, cyano, optionally substituted C¿1-30?hydrocarbyl, X?1, X2 and X3¿ which may be the same or different, each independently represents a group capable of receiving a liable proton.</p> |
