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US 8,557,493 B2Granted
Toner compositions and processes
AssigneeXerox Corporation
InventorsValerie M. Farrugia, Guerino G. Sacripante, Sonja Hadzidedic
Life of this patent
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Abstract
Environmentally friendly toner particles are provided which may include a bio-based amorphous polyester resin, optionally in combination with another amorphous resin and/or a crystalline resin. Methods for providing these toners are also provided. In embodiments, the bio-based amorphous polyester resin is modified with a multi-functional bio-based acid, thereby providing acid-functionalized polyesters, which can be readily emulsified in emulsion aggregation processes for toner fabrication.
Claims9
A toner consisting of:
- an acidified bio-based resin of a bio-based amorphous polyester resin in combination with a bio-based acid;
- a crystalline polyester resin and one or more ingredients selected from the group consisting of colorants, waxes, and combinations thereof, wherein the acidified bio-based resin has an acid value of from about 2 mg KOH/g of resin to about 200 mg KOH/g of resin, and wherein said bio-based amorphous polyester resin and said bio based acid are derived from natural biological materials of plant based feed stocks or vegetable oils, and wherein said bio-based amorphous polyester resin has a carbon/oxygen ratio of from about 2 to about 15, wherein said toner consists of a core of said bio-based amorphous polyester resin, and said crystalline polyester, and a shell of said bio-based amorphous polyester resin, and wherein the bio-based acid is selected from the group consisting of citric acid, citric acid anhydride, and combinations thereof, present in an amount of from about 0.1% by weight to about 20% by weight of the bio-based amorphous resin and wherein said bio-based amorphous polyester resin is derived from a dimer diol, D-isosorbide, naphthalene dicarboxylate, and a dicarboxylic acid.
A toner consisting of:
- an acidified bio-based resin consisting of a bio-based amorphous polyester resin in combination with a multi-functional bio-based acid;
- a crystalline polyester resin;
- and
- one or more ingredients selected from the group consisting of colorants, waxes, and combinations thereof,
- wherein the bio-based acid is present in an amount of from about 0.5% by weight to about 10% by weight of the bio-based amorphous resin, wherein the acidified bio-based resin has an acid value of from about 5 mg KOH/g, of resin to about 50 mg KOH/g of resin and wherein said bio-based amorphous polyester resin and said bio based acid are derived from natural biological materials of plant based feed stocks or vegetable oils, wherein said toner consists of a core of said bio-based amorphous polyester resin, and said crystalline, polyester resin and a shell of said bio-based amorphous polyester resin, wherein said multi-functional bio-based acid is selected from the group consisting of citric acid, citric acid anhydride, and combinations thereof and wherein said bio-based amorphous polyester resin is derived from a dimer diol, D-isosorbide, naphthalene dicarboxylate, and a dicarboxylic acid.
2 more elements
Dependencies are inferred from the claim text.