Calix arene charge control agent and toner for developing electrostatic

Abstract

Charge control agent and toner for developing electrostatic images comprising such a charge control agent whose active ingredient is a calix (n) arene compound of formula I: ##STR1## wherein x+y=n; x and y each is an integer of 1 or more; n is an integer of 4-8; the x repeat units and y repeat units can be arranged in any order; R.sup.1 and R.sup.2 each is H, C.sub.1-12 alkyl, C.sub.2-12 alkenyl, C.sub.7-12 aralkyl, phenyl, C.sub.4-8 cycloalkyl, halogen, nitro, amino, alkyl- or phenyl-substituted amino, --Si(CH.sub.3).sub.3, or --SO.sub.3 H; and of the n R radicals in the --OR groups, 1 to (n-1) are H, with the remaining (n-1) to 1 being alkyl, alkenyl, phenyl, aralkyl, cycloalkyl, --COR.sup.3 �wherein R.sup.3 is H, alkyl, alkenyl, phenyl, aralkyl, or cycloalkyl!, --Si(CH.sub.3).sub.3, --(CH.sub.2).sub.m COOR.sup.4 �wherein R.sup.4 is H or lower alkyl and m is an integer of 1-3!, --(CH.sub.2 CH.sub.2 O).sub.r H �wherein r is an integer of 1-10!, or ##STR2##