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. 02, 1998
Filed:
Feb. 25, 1997
Sadanao Okuda, Ibaraki-ken, JP;
Masato Ishikawa, Ibaraki-ken, JP;
Takashi Suzuki, Ibaraki-ken, JP;
Yoshihiro Hayashi, Ibaraki-ken, JP;
Riso Kagaku Corporation, Tokyo, JP;
Abstract
An water-in-oil (W/O) emulsion ink for stencil printing is provided, which is excellent in emulsion stability. The water-in-oil (W/O) emulsion ink has an oil phase and a water phase, in which a water-insoluble colorant is contained in said water phase, and said water-insoluble colorant comprises an insoluble azo pigment. The insoluble azo pigment contained in the water phase preferably has an average particle size of 1 .mu.m or less. The emulsion ink is preferably formed by use of an emulsifier having an HLB of 1.5-6.0, and the water phase preferably has a maximum particle diameter of 10 .mu.m or less.