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:
Jul. 08, 2008
Filed:
Dec. 26, 2000
Yukihiro Nakano, Wakayama, JP;
Shigeki Nagashima, Wakayama, JP;
Hiroki Kubo, Wakayama, JP;
Michitaka Sawada, Wakayama, JP;
Yukihiro Nakano, Wakayama, JP;
Shigeki Nagashima, Wakayama, JP;
Hiroki Kubo, Wakayama, JP;
Michitaka Sawada, Wakayama, JP;
Kao Corporation, Tokyo, JP;
Abstract
An ink set comprising a black ink and a color ink, wherein the black ink comprises an aqueous dispersion of water-insoluble vinyl polymer particles containing an oil-soluble black dye or carbon black, the vinyl polymer particles have an ionicity opposite to that of the color ink, and the vinyl polymer comprises a water-insoluble vinyl polymer prepared by copolymerizing (a) a salt forming group-containing monomer, (b) a monomer represented by the formula (I):CH═C(R)COO(RO)R  (I)wherein Ris hydrogen atom or a lower alkyl group, Ris a divalent hydrocarbon group which may have a hetero-atom, Ris a monovalent hydrocarbon group which may have a hetero-atom, and p is a number of 1 to 60, (c) a macromer, and (d) a monomer copolymerizable with these monomers. The ink set can be used as an ink set for inkjet recording, which is excellent in not only fixing abilities and water resistance, but also bleeding resistance and jettability, and can form very clear printouts.