(19)
(11) EP 2 375 290 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
29.08.2012 Bulletin 2012/35

(43) Date of publication A2:
12.10.2011 Bulletin 2011/41

(21) Application number: 11002889.1

(22) Date of filing: 06.04.2011
(51) International Patent Classification (IPC): 
G03G 9/087(2006.01)
G03G 9/08(2006.01)
G03G 9/097(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME

(30) Priority: 07.04.2010 JP 2010088236

(71) Applicant: Tomoegawa Co., Ltd.
1-chome Chuo-ku Tokyo 104-8335 (JP)

(72) Inventor:
  • Miyamoto, Atsuo
    Shizuoka-shi Shizuoka, 421-0192 (JP)

(74) Representative: Eisenführ, Speiser & Partner 
Postfach 31 02 60
80102 München
80102 München (DE)

   


(54) Toner for electropotography and production method therefor


(57) A toner which can solve problems in durability of the printed matter (smear resistance), in that the toner image is easily broken, and moreover, the printed matter is stained by re-attaching a broken portion to itself or optional portions of near particles thereof, in the case in which external force such as scratching, etc., is applied to printed matter in which images were recorded by an electrophotographic device adopting a flash fixing method which is a non-contacting fixing method. The toner for electrophotography includes at least binder resin, wax and hydrophobic fine particles having a diameter of 1 µm or less, wherein wax domains in the toner particle are dispersed at 0.5 µm or less or the binder resin and the wax are compatibilized, and the hydrophobic fine particles are dispersed in the toner particle. A production method of the toner for electrophotography produces the toner for electrophotography by a melt-kneading and crushing method, wherein wax and binder resin in which hydrophobic fine particles are previously dispersed, are melt-kneaded.





Search report









Search report