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Color toner
| Details |
Inventors: Hayashi, Kazuyuki; Iwasaki, Keisuke; Morii, Hiroko;
Assignee: Toda Kogyo Corporation (Hiroshima-ken, JP)
Primary Examiner: Chapman; Mark A.
Assistant Examiner:
Attorney, Agent or Firm: Nixon & Vanderhye P.C.
A color toner comprises: a binder resin, and a colorant having an average particle diameter of 0.005 to 0.30 .mu.m, comprising: extender pigments, a gluing agent-coating layer formed on surface of the extender pigment, and an organic pigment coat formed onto the gluing agent-coating layer in an amount of 1 to 500 parts by weight based on 100 parts by weight of the extender pigments. The color toner exhibits not only a clear hue, but also excellent fluidity and dispersibility of colorants. |
|
DETAILED DESCRIPTION OF THE INVENTION The present invention will now be described in detail below.
First, the colorant for color toner used in the present invention is described.
As the extender pigments used in the present invention, there may be exemplified fine silica particles such as silica powder, white carbon, fine silicate powder and diatomaceous earth, clay, calcium carbonate, precipitated barium sulfate, alumina white, talc, transparent titanium oxide and satin white.
The extender pigments may be those having any suitable shape such as spherical particles, granular particles, polyhedral particles, acicular particles, spindle-shaped particles, rice ball-like particles, flake-shaped particles, scale-like particles and plate-shaped particles.
In the consideration of good fluidity, the obtained colorant for color toner is in the form of spherical particles or granular particles having a sphericity (average particle diameter/average minimum diameter; hereinafter referred to merely as "sphericity") of usually from 1.
0 to less than 2.
0, preferably 1.
0 to 1.
8, more preferably 1.
0 to 1.
5.
As to the particle size of the extender pigments, the average particle diameter thereof is usually 0.
005 to 0.
30 .
mu.
m, preferably 0.
006 to 0.
25 .
mu.
m, more preferably 0.
007 to 0.
20 .
mu.
m.
When the average particle diameter of the extender pigments is more than 0.
30 .
mu.
m, the obtained colorant becomes coarse particles, resulting in poor dispersibility in binder resin.
When the average particle diameter of the extender pigments is less than 0.
005 .
mu.
m, such extender pigments tend to be agglomerated by the increase of intermolecular force therebetween due to fine particles of the extender pigments, so that it may be difficult to uniformly coat the surface of the extender pigment with a gluing agent and uniformly adhere the organic pigments onto the gluing agent-coating layer.
The extender pigments have a BET specific surface area value of preferably not less than 20 m.
sup.
2 /g.
When the BET specific surface area value is less than 20 m
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Manufacturing Materials 
