Radiation curable dry toner and method for preparing the same
AssigneeXeikon Manufacturing N.V.
InventorsLode Erik Dries Deprez, Werner Jozef Johan Op de Beeck
Life of this patent
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Abstract
A radiation curable dry toner includes core-shell toner particles. The core-shell toner particles have an average volume-based diameter between 5 and 10 micrometre, and a core-shell toner particle thereof includes an inner portion having a radiation curable first resin material consisting of at least 90 weight %, preferably at least 95 weight %, of the total amount of resin material of the inner portion; an outer shell surrounding said inner portion, said outer shell including a second resin material, said second resin material being any one of the following: cured first resin material; or a resin material which is different from the first resin material.
Claims21
A radiation curable dry toner comprising core-shell toner particles, wherein the core-shell toner particles have an average volume-based diameter between 5 and 10 micrometre, wherein a core-shell toner particle thereof comprises:
- a. an inner portion comprising a radiation curable first resin material consisting of at least 90 weight % of the total amount of resin material of the inner portion;
- b. an outer shell surrounding said inner portion, said outer shell comprising a second resin material, said second resin material being any one of the following:
- cured first resin material.
A radiation curable dry toner comprising core-shell toner particles, wherein the core-shell toner particles have an average volume-based diameter between 5 and 10 micrometre, wherein a core-shell toner particle thereof comprises:
- a. an inner portion comprising a radiation curable first resin material consisting of at least 90 weight % of the total amount of resin material of the inner portion;
- b. an outer shell surrounding said inner portion, said outer shell comprising a second resin material which is different from the first resin material, wherein the first resin material has a first glass transition temperature and the second resin material has a second glass transition temperature, wherein the difference between the second glass transition temperature and the first glass transition temperature is larger than 5° C.
A method for preparing a radiation curable dry toner comprising core-shell toner particles, said method comprising:
- a. preparing dry toner particles comprising a radiation curable resin material;
- said radiation curable resin material consisting of at least 90 weight % of the total amount of resin material of the prepared particles;
- b. dispersing and heating said toner particles in an airflow;
- c. curing an outer shell of said toner particles in said airflow;
- d. cooling said toner particles in order to obtain the core-shell toner particles;
- wherein the dry toner particles are prepared with dimensions which are such that the obtained core-shell toner particles have an average volume-based diameter between 5 and 10 micrometre.
A method for preparing a radiation curable dry toner comprising core-shell toner particles, said method comprising:
- a. preparing an emulsion including particles comprising a radiation curable first resin material;
- said radiation curable first resin material consisting of at least 90 weight % of the total amount of resin material of the prepared particles;
- b. aggregating said particles to form aggregated particles;
- c. contacting said aggregated particles with a second resin material to form an outer shell over said aggregated particles;
- said second resin material being a resin material which is different from the first resin material, wherein the first resin material has a first glass transition temperature and the second resin material has a second glass transition temperature, wherein the difference between the second glass transition temperature and the first glass transition temperature is larger than 5° C.;
- d. coalescing the aggregated particles with the outer shell to form core-shell toner particles;
- wherein said steps are performed such that the formed core-shell toner particles have an average volume-based diameter between 5 and 10 micrometre.
Dependencies are inferred from the claim text.