Coated carrier for development of electrostatically charged...

Details Coated carrier for development of electrostatically charged... Coated carrier for development of electrostatically charged...

G - Physics

03

G

G03G 9/113 (2006.01)

Patent

CA 2228510

A coated carrier for developing electrostatically charged images which comprises a particulate core and a coating resin covering the core, characterized in that the particulate core is coated with 1 to 30 wt.% of a coating resin which at least contains less than 50 wt.% of a polyolefin resin having a cyclic structure, satisfying the relationships: i.v. (intrinsic viscosity) 0.25 dl/g and HDT (heat deformation temperature according to DIN53461-B) 70 ~C and exhibiting a number-average molecular weight of 7500 or above and a weight-average molecular weight of 15000 or above as determined by GPC. This coated carrier is effective in inhibiting the generation of spent toners in the development with dry toners and is excellent in charge control.

L'invention concerne un support pourvu d'un revêtement, servant au développement d'images chargées électrostatiquement, comprenant une âme particulaire et une résine de revêtement qui recouvre cette âme. Ce support se caractérise en ce que son âme particulaire est revêtue d'1 à 30 % en poids d'une résine qui comprend moins de 50 % en poids d'une résine polyoléfinique ayant une structure cyclique, satisfaisant aux relations: viscosité intrinsèque ? 0.25 dl/g et une température de déformation thermique (selon DIN 53461-B) ? 70 ·C, et présentant un poids moléculaire moyen en nombre de 7500 minimum et un poids moléculaire moyen en poids de 15000 minimum, déterminés par chromatographie sur gel. Ce support pourvu d'un revêtement inhibe de façon efficace la production de toners résiduaires lors du développement avec des toners secs et présente une excellente aptitude à la limitation de la charge.

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