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:
Aug. 08, 2000
Filed:
Jul. 28, 1998
Hitachi Maxell, Ltd., Osaka, JP;
Abstract
The present invention provides a dispersion ink excellent not only high-definition print quality but also re-dispersibility. More particularly, the present invention provides a dispersion ink comprising at least a pigment or a disperse dye, which has a particle diameter of 75 nm or less, an amphiphilic compound, and water, said amphiphilic compound having a hydrophilic portion composed of a poly(ethylene oxide) and a hydrophobic portion composed of an alkyl group and/or an aromatic group and bonded to the hydrophilic portion, said amphiphilic compound containing at least one ionic group at the end of the poly(ethylene oxide) constituting the hydrophilic portion which is not bonded to the hydrophobic portion, and the whole amphiphilic compound having a molecular weight of 5,000 or less, wherein between the particle diameter of said pigment or said disperse dye and the molecular weight of said amphiphilic compound, there is the relationship represented by the following expression (1):