The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 21, 2014
Filed:
Dec. 17, 2010
Shoichi Murata, Wakayama, JP;
Eiji Shirai, Wakayama, JP;
Hiroshi Mizuhata, Wakayama, JP;
Manabu Suzuki, Wakayama, JP;
Shoichi Murata, Wakayama, JP;
Eiji Shirai, Wakayama, JP;
Hiroshi Mizuhata, Wakayama, JP;
Manabu Suzuki, Wakayama, JP;
KAO Corporation, Tokyo, JP;
Abstract
A method for producing an electrophotographic toner, including steps of: (1) preparing a thermally treated resin particle dispersion by retaining, for one hour or longer at a temperature satisfying the formula: (melting point of the crystalline polyester (a1)−35) (° C.)<T<melting point of the crystalline polyester (a1) (° C.), a dispersion of resin particles (A) having a volume median particle size of 0.02-2 μm and containing a resin containing a crystalline polyester (a1) of 1-50 wt % and an amorphous polyester (b1); (2) preparing an aggregated particle dispersion by aggregating thermally treated resin particles contained in the thermally treated resin particle dispersion prepared through step 1; (2a) preparing resin-fine-particle-attached aggregated particles by adding, to the aggregated particle dispersion prepared through step 2, a dispersion of resin fine particles (B) containing an amorphous polyester (b2) of 70 wt % or more; and (3) unifying the resin-fine-particle-attached aggregated particles prepared through step 2a.