Toner compositions with modified polyester resins

A toner comprised of a polyester obtained by a process which comprises reacting a polyester resin endcapped with hydroxyl moieties or groups with an organic acid anhydride at a temperature of from about 125.degree. C. to about 200.degree. C., thereby resulting in a polyester resin endcapped with acidic moieties or acid groups wherein the polyester rein with acidic or acid end groups is of the following alternative formulas ##STR3## wherein R is an alkylene, an alkyleneoxyalkylene group or an arylene group;

• R' is an alkylene or arylene group;
• n is a number of from 1 to 3, and a, b, and c represent the number of repeating segments and each is a number of from about 1 to about 1,000 subject to the provision that b or c is at least 1, and that the sum of a, b and c is from about 10 to about 1,000;
• and pigment.

A toner consisting essentially of pigment and a polyester resin with acidic end groups represented by the following alternative formulas ##STR4## wherein R is an alkylene, an alkyleneoxyalkylene group or an arylene group;

• R' is an alkylene or arylene group;
• n is a number of from 1 to 3;
• and a, b, and c represent the number of repeating segments and each is a number of from about 1 to about 1,000 subject to the provision that b or c is at least 1, and that the sum of a, b and c is from about 10 to about 1,000.