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:
Feb. 24, 2015
Filed:
Feb. 03, 2012
Yuki Amano, Yokkaichi, JP;
Naohiro Naito, Yokkaichi, JP;
Hisao Okada, Yokohama, JP;
Masaki Okubo, Tsukuba, JP;
Yoshikazu Aoki, Tsukuba, JP;
Hideyuki Otsuka, Koriyama, JP;
Yuki Amano, Yokkaichi, JP;
Naohiro Naito, Yokkaichi, JP;
Hisao Okada, Yokohama, JP;
Masaki Okubo, Tsukuba, JP;
Yoshikazu Aoki, Tsukuba, JP;
Hideyuki Otsuka, Koriyama, JP;
Nippon Aerosil Co., Ltd., Tokyo, JP;
Hodogaya Chemical Co., Ltd., Tokyo, JP;
Abstract
Provided by the present invention is a surface-modified silica powder, characterized in that the said powder is obtained by surface treatment of a silica powder with one or two or more of a compound (A) and with an aminosilane (B), wherein the fixing rate of the compound (A) and the aminosilane (B) is a total of 50% or more, the hydrophobic rate is 80% or more, and the triboelectrostatic charge amount is 200 μC/g or less in its absolute value. The surface-modified silica powder of the present invention can stabilize many properties including fluidity and electrostatic properties while can significantly reduce problems such as fogging and decrease in image quality without significantly deteriorating characteristics of a developing agent and so forth when this is used as an external additive.