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. 08, 1991
Filed:
Apr. 11, 1989
Takeshi Nagaoka, Higashi-matsuyama, JP;
Takashi Yoshioka, Tsurugashima, JP;
Kazuo Kamagata, Hatoyama, JP;
Natsuo Sawa, Tadotsu, JP;
Takayuki Murai, Sakado, JP;
Abstract
Disclosed is a positively chargeable toner comprising, as a charge-controlling agent, an acid adduct, metal complex or derivative of a 2-alkylimidazole represented by the following formula: ##STR1## wherein R.sub.2 stands for an alkyl group having 11 through 17 carbon atoms, and R.sub.4 stands for a hydrogen atom or a methyl group. In this toner, a high charge-controlling effect is attained with a small amount of the charge-controlling agent, and since the charge-controlling agent has a white color or light color, this toner is advantageously used as an electrostatic photographic toner for the color printing.