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:
May. 04, 2010
Filed:
Oct. 10, 2008
Masateru Yasumura, Ibaraki, JP;
Masami Ito, Fukushima, JP;
Naohiro Tarumoto, Tokyo, JP;
Yoshikazu Aoki, Fukushima, JP;
Masafumi Umekawa, Fukushima, JP;
Masaki Okubo, Fukushima, JP;
Hideyuki Otsuka, Fukushima, JP;
Jun Watanabe, Fukushima, JP;
Masateru Yasumura, Ibaraki, JP;
Masami Ito, Fukushima, JP;
Naohiro Tarumoto, Tokyo, JP;
Yoshikazu Aoki, Fukushima, JP;
Masafumi Umekawa, Fukushima, JP;
Masaki Okubo, Fukushima, JP;
Hideyuki Otsuka, Fukushima, JP;
Jun Watanabe, Fukushima, JP;
Hodogaya Chemical Co., Ltd., Tokyo, JP;
Abstract
The present invention discloses an oxidized mixed cyclic phenol sulfide which is a mixture of the oxidized cyclic phenol sulfide wherein m is 8 and the oxidized cyclic phenol sulfide wherein m is an integer other than 8, the oxidized cyclic phenol sulfide being represented by the following formula (1): wherein R is a straight or branched alkyl group having 1 to 6 carbon atoms, m is an integer from 4 to 9, and n is 1 or 2; or an oxidized cyclic phenol sulfide of formula (1) wherein m is 8. The present invention also discloses a charge control agent which comprises the above sulfide(s) as the active ingredient; and a toner which comprises the charge control agent, a coloring agent and a binder resin. This charge control agent is particularly useful for color toners, and it speeds up charging risetime, and has a high charge amount and charging characteristics excellent in environmental stability. Further, the charge control agent is safe since it does not have any problem with the waste regulations.