Electrostatic toner composition to enhance copy quality by...

G - Physics – 03 – G

Patent

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G03G 9/00 (2006.01) G03G 9/087 (2006.01) G03G 9/097 (2006.01)

Patent

CA 2495898

An electrostatic developer is provided that contains toner-containing image- forming particles and an uncrosslinked, linear hydrocarbon based homopolymer wax component, wherein the wax has a total number of branches in each of one or more chains that is less than 0.5%, relative to total number of carbons in said wax; wherein the wax is further characterized by having a set of endotherms as determined by differential scanning calorimetry (DSC) run at a maximum rate of 10~C per minute, these endotherms being characterized by a primary endotherm and at least a secondary endotherm, the primary endotherm exhibiting a temperature range of between 70~C and 90~C, and the secondary endotherm exhibiting a temperature range of between 95~C and 110~C, and wherein the wax has a crystallinity of from 75% to 90% as determined by small angle X-ray diffraction analysis.

L'invention concerne un révélateur électrostatique qui contient des particules de formation d'image contenant de l'encre en poudre et un composant de cire homopolymère à base d'hydrocarbure linéaire non réticulé. La cire présente un nombre totale de branches dans chaque chaîne inférieur à 0,5 % par rapport au nombre total d'atomes de carbone qu'elle renferme. La cire présente en outre un ensemble d'endothermes déterminés par calorimétrie de balayage différentiel (DSC) exécutée à un taux maximal de 10 ·C par minute, ces endothermes se caractérisant par un endotherme principal et au moins un endotherme secondaire. L'endotherme principale présente une gamme de température entre 70 ·C et 90 ·C et l'endotherme secondaire une gamme de température entre 95 ·C et 110 ·C. La cristallinité de la cire se situe entre 75 % et 90 % déterminée par l'analyse de diffraction aux rayons X présentant un petit angle.

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