Toner compositions and process thereof
AssigneeXerox Corporation
InventorsGuerino Sacripante, Ke Zhou, Richard Veregin, Edward Zwartz, Maria McDougall
Life of this patent
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Abstract
A toner composition is provided which contains a polyester resin with hydrophilic groups and hydrophobic end groups and a colorant, wherein said polyester resin is of the formula: wherein R is an alkylene group; X is an aromatic hydrocarbon; Y is selected from the group consisting of an alkali and an alkaline earth metal salt of an arylenesulfonate or an alkylenesulfonate; R′ is a hydrophobic group, and m and n represent the number of random segments of from about 50 to about 300 for n, and from about 20 to about 2,000 for m, and m is less than 20 times n.
Claims26
A toner composition comprised of a polyester resin with hydrophilic groups and hydrophobic end groups and a colorant, wherein said polyester resin is of the formula:
- wherein R is an alkylene group;
- X is an aromatic hydrocarbon;
- Y is selected from the group consisting of an alkali and an alkaline earth metal salt of an arylenesulfonate or an alkylenesulfonate;
- R′ is a hydrophobic group, and
- m and n represent the number of random segments of from about 50 to about 300 for n, and from about 20 to about 2,000 for m, and m is less than 20 times n.
A process for the preparation of a toner composition comprising:
- (a) mixing an emulsion of a polyester resin of the formula
- wherein R is an alkylene group;
- X is an aromatic hydrocarbon;
- Y is an alkali or alkaline earth metal salt of an arylenesulfonate or an alkylenesulfonate and comprises from about 3 mole percent to about 8 mole percent of said polyester resin;
- R′ is a hydrophobic group, and
- m and n represent the number of random segments of from about 50 to about 300 for n, and from about 20 to about 2,000 for m, or m is less than 20 times n,
- with a pigment to form a mixture and heating said mixture at a temperature of from about 50° C. to about 75° C. with stirring;
- (b) adding a solution comprising a catalyst to said mixture to form toner particles;
- (c) monitoring said toner particle size in said mixture until the volume particle size is less than 25 μm, or from about 3 μm to about 12 μm, with a geometric distribution of about 1.3;
- (d) cooling said mixture to a temperature of from about 25° C. to about 30° C., or a temperature of from about 20° C. to about 26° C., and optionally separating said mixture followed by filtration, washing and freeze-drying said toner particles.
Dependencies are inferred from the claim text.