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:
Apr. 05, 1994
Filed:
Jul. 22, 1993
Noriaki Tsubota, Himeji, JP;
Masahiko Kubo, Yao, JP;
Kazuo Fuji, Higashi-osaka, JP;
Kazuhisa Edahiro, Hirakata, JP;
Mita Industrial Co., Ltd., Osaka, JP;
Abstract
Disclosed is a toner having an excellent transparency for full color development, which comprises a binder resin and a magenta coloring dispersed therein wherein (i) said magenta coloring agent is a quinacridone pigment, (ii) said pigment is dispersed in the binder resin in the form of fine particles and that when the toner is formed into a layer having a thickness of 0.9 .mu.m, the area occupied by the dispersed pigment in 780,000 .mu.m.sup.2 of the area of the formed surface is such that the number of dispersed pigment particles having a size of 10 to 12.5 .mu.m.sup.2 is smaller than 40 and the number of dispersed pigment particles having a size of 12.5 to 15.0 .mu.m.sup.2 is smaller than 20, and (iii) the binder resin has an electroconductivity of 1.0.times.10.sup.-9 to 5.0.times.10.sup.-9 (s/cm). The critical quantities of these dispersed particles having the above sizes differ among magenta, cyan and yellow toners. Each of these color toners has an excellent light-transmitting property, and therefore, these toners can be valuably used for the full color development where these toners are developed in the overlapped state on a transfer material to form a full color image.