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|
Positive-electrification toner
| Details |
Inventors: Kabashima, Hirotaka; Takagiwa, Hiroyuki; Akimoto, Kunio; Nagase, Tatsuya;
Assignee: Konica Corporation (Tokyo, JP)
Primary Examiner: McCamish; Marion E.
Assistant Examiner: Chapman; Mark A.
Attorney, Agent or Firm: Finnegan, Henderson, Farabow, Garrett & Dunner
A positive-electrification toner capable being fixed with a hot roller having a fluoro-resin covering layer is disclosed. The toner comprises mother particles containing a resin and a coloring agent, and vinyl resin fine particles fastened to the mother particles by mechanical impact force, wherein the resin has a softening point higher than that of the resin contained in the mother particles and not higher than 160.degree. C. and the vinyl resin fine particles have a frictional negative electrification quantity against iron powder not larger than 100 .mu.c/g. The toner is used for electrophotography, electrostatic printing and electroststic recording. |
|
DETAILED DESCRIPTION What is claimed is: 1.
A positive-electrification toner comprising: (1) mother particles containing a resin and a coloring agent, in which resin a crystalline polyester and an amorphous vinyl polymer are chemically bonded, wherein the softening point of the binder resin of the mother particle is 90.
degree.
to 130.
degree.
C.
, and (2) vinyl resin fine particles fastened to the mother particles by mechanical impact force, wherein the resin has a softening point higher than that of the resin contained in the mother particles and not higher than 160.
degree.
C.
and the vinyl resin fine particles have a frictional negative electrification quantity against iron powder larger than 100 .
mu.
c/g in an absolute value.
2.
A positive-electrification toner as claimed in claim 1, wherein an average particle size of the vinyl resin fine particles is 0.
02 to 0.
6 .
mu.
m.
3.
A positive-electrification toner as claimed in claim 1, wherein the vinyl resin is styrene/methyl methacrylate/n-butylacrylate copolymer, styrene/methyl methacrylate/n-butyl acrylate/methacrylic acid copolymer or styrene/methylmethacrylate/n-butylacrylate/sodium styrenesulfonate copolymer.
4.
A positive-electrification toner as claimed in claim 1, wherein the vinyl resin fine particles have a frictional negative electrification quantity against iron powder smaller than 200 .
mu.
c/g in an absolute value.
5.
A positive-electrification toner as claimed in claim 1, wherein the softening point of the resin of fine particles T.
sub.
2 is 10.
degree.
to 60.
degree.
C.
higher than the softening point of the resin of mother particles T.
sub.
1.
6.
A positive-electrification toner as claimed in claim 1, wherein a cover ratio of the mother particles with the resin fine particles 10 to 90%.
7.
A positive-electrification toner as claimed in claim 1, wherein an average particle size of mother particles is 5 to 15 .
mu.
m.
8.
A positive-electrification toner as claimed in claim 1 wherein the toner is capable being fixed with a hot roller having a fluoro-resin covering layer
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Molecular Biology 
