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:
Jun. 01, 2021
Filed:
Jul. 25, 2018
Applicant:
Riso Kagaku Corporation, Tokyo, JP;
Inventors:
Assignee:
RISO KAGAKU CORPORATION, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C09D 11/36 (2014.01); C09D 11/38 (2014.01); C09D 11/322 (2014.01); C09D 11/326 (2014.01);
U.S. Cl.
CPC ...
C09D 11/36 (2013.01); C09D 11/322 (2013.01); C09D 11/326 (2013.01); C09D 11/38 (2013.01);
Abstract
An oil-based magnetic ink can be provided that has low viscosity and improved storage stability. Specifically disclosed is an oil-based magnetic ink containing a magnetic pigment that contains a ferrite, a pigment dispersant A that has an acid value but has no base value, a pigment dispersant B that has an acid value and a base value, and a non-aqueous solvent. One example of the pigment dispersant A is at least one compound selected from the group consisting of hydroxystearic acid and polyhydroxystearic acid. One example of the pigment dispersant B has an acid value of at least 5 mgKOH/g.