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:
Apr. 21, 2009
Filed:
Sep. 19, 2003
Shuji Ichikawa, Yokohama, JP;
Miyuki Shoji, Tokyo, JP;
Shuji Ichikawa, Yokohama, JP;
Miyuki Shoji, Tokyo, JP;
Mitsubishi Pencil Co., Ltd., Tokyo, JP;
Abstract
An oil-based ink composition for a ball-point pen that enables suppression of a blobbing phenomenon by controlling the internal cohesion force of an ink is provided; An oil-based ink composition for a ball-point pen at least comprising a colorant, a resin, and from 0.01 to 1.5 % by weight of a high polymerization degree polybutyl vinylal with a polymerization degree of 900 (theoretical molecular weight of 60,000) or more and comprising, as a main solvent, a solvent selected from alcohols, polyhydric alcohols, and glycol ethers with a vapor pressure at 25° C. of 0.001 mmHg or higher by 50% or more for the entire solvent. Further, an oil-based ink composition for use in a ball-point pen having a smooth feel in writing, and excellent in the improvement for the fastness and the dispersion stability of the coloring pigment is provided; an oil-based ink composition for use in a ball-point pen containing, as a main solvent, a solvent of the chemical structural formula (1) where R, R, and Reach represents independently H or CH.