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. 30, 2009
Akiyoshi Sabu, Numazu, JP;
Akihiro Kotsugai, Numazu, JP;
Ryota Inoue, Mishima, JP;
Keiko Osaka, Mishima, JP;
Shingo Sakashita, Numazu, JP;
Yukiko Nakajima, Numazu, JP;
Satoshi Mochizuki, Numazu, JP;
Akiyoshi Sabu, Numazu, JP;
Akihiro Kotsugai, Numazu, JP;
Ryota Inoue, Mishima, JP;
Keiko Osaka, Mishima, JP;
Shingo Sakashita, Numazu, JP;
Yukiko Nakajima, Numazu, JP;
Satoshi Mochizuki, Numazu, JP;
Ricoh Company, Limited, Tokyo, JP;
Abstract
A toner including a binder resin comprising a resin (a) comprising a polyhydroxycarboxylic acid skeleton formed from an optically-active monomer. The polyhydroxycarboxylic acid skeleton has a weight average molecular weight of from 7,000 to 60,000. The binder resin comprises the polyhydroxycarboxylic acid skeleton in an amount of from 10 to 90% by weight. The optical purity X (%) of the polyhydroxycarboxylic acid skeleton represented by the following formula is 80% or less:(%)=|(-isomer)−(-isomer)|wherein X(L-isomer) and X(D-isomer) represent molar ratio (%) of L-isomer and D-isomer of the optically-active monomer, respectively.