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:
Dec. 26, 2017
Filed:
Sep. 08, 2016
Masayuki Fukuoka, Tokyo, JP;
Shigeyuki Harada, Shizuoka, JP;
Yoshiki Yanagawa, Shizuoka, JP;
Takuya Yamazaki, Shizuoka, JP;
Kazukiyo Nagai, Shizuoka, JP;
Yuusuke Koizuka, Shizuoka, JP;
Tomoyuki Shimada, Shizuoka, JP;
Akiyoshi Sabu, Shizuoka, JP;
Akihiko Matsuyama, Shizuoka, JP;
Masayuki Fukuoka, Tokyo, JP;
Shigeyuki Harada, Shizuoka, JP;
Yoshiki Yanagawa, Shizuoka, JP;
Takuya Yamazaki, Shizuoka, JP;
Kazukiyo Nagai, Shizuoka, JP;
Yuusuke Koizuka, Shizuoka, JP;
Tomoyuki Shimada, Shizuoka, JP;
Akiyoshi Sabu, Shizuoka, JP;
Akihiko Matsuyama, Shizuoka, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
Provided is an ink including: copolymer including at least one of structural unit of formula (1) and structural unit of formula (2); pigment having acid value of ≦15 μmol/g and represented by formula (3); water; and water-soluble organic solvent. In formula (1), Rrepresents hydrogen or methyl group. Lrepresents alkylene group including 2-18 carbon atoms. In formula (2), Rrepresents hydrogen or methyl group. Lrepresents single bond or —(CH)n-O— of which oxygen is bound with biphenyl. n represents integer of 2 through 18. In formula (3), Rrepresents any one of hydrogen, halogen, alkyl group including 1-4 carbon atoms, alkoxy group including 1-4 carbon atoms, hydroxy, nitro, and alkyl substituted or unsubstituted amino group including 1-4 carbon atoms. n represents integer of 1 through 5. When n is a plural number, Rmay be identical or different. R, R, and Rrepresent alkyl group including 1-4 carbon atoms.