Writing instrument having excellent cap-off performance
AssigneeMitsubishi Pencil Company, Limited
InventorsTakahiro Osada, Kazuhiro Ami
Life of this patent
Estimating the term…
Abstract
The writing instrument having an excellent cap-off performance is characterized, as shown in, for example, FIG. 3, by that in a writing instrument 10 having a pen tip 13 comprising a fibrous feed or a plastic feed, the pen tip 13 described above is coated with a substance which is solid at room temperature and in which a solubility in an ink solvent is 10% or less at room temperature among substances providing the pen tip with a cap-off property. This writing instrument 10 is such excellent in a cap-off performance that the good writing performance is obtained even after the pen tip is left standing in the air over a long period of time.
Claims8
A writing instrument having an excellent cap-off performance, wherein the writing instrument having a pen tip comprising a fibrous feed or a plastic feed, the pen tip described above is coated with a substance which is solid at room temperature and in which a solubility in an ink solvent is 10% or less at room temperature and which repeatedly and constantly films on a surface part of the pen tip that can be broken by writing pressure in writing, among substances providing the pen tip with a cap-off property.
Dependencies are inferred from the claim text.