External additive for electrophotographic toner, toner, developer and image forming method and apparatus

External additive for electrophotographic toner, toner, developer and image forming method and apparatus

  • CN 101,935,045 A
  • Filed: 07/15/2003
  • Published: 01/05/2011
  • Est. Priority Date: 07/15/2002
  • Status: Active Application
First Claim
Patent Images

1. admixture that is used for electrofax tinter comprises:

  • Siliceous oxide fine particle, wherein the average initial particle of the number of this oxide fine particle is that 30nm is to 300nm, the standard deviation of the size distribution of initial particle satisfies relational expression;

    R/4≤

    σ



    R, and wherein R represents initial particle, and described standard deviation is in 40nm arrives the scope of 75nm;

    This oxide fine particle is spherical basically, and its circularity SF1 is 100 to 130, and circularity SF2 is 100 to 125, and circularity SF1 is drawn by formula (1), and circularity SF2 is drawn by formula formula (2);

    SF1=(L 2/ A) * (π

    /4) * 100 formulas (1) SF2=(P 2/ A) * (1/4 π

    ) * 100 formulas (2) Wherein " L " represents the absolute maximum length of oxide fine particle;

    Wherein " A " represents the shadow area of oxide fine particle;

    The maximum perimeter of " P " expression oxide fine particle.

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