Writing utensil having excellent cap-off performance
AssigneeMitsubishi Pencil Company, Limited
InventorsKazuhiro Ami, Tatsuya Mizoguchi, Takahiro Osada
Life of this patent
Estimating the term…
Abstract
Provided is a writing instrument in which a pen tip comprising a fibrous feed or a plastic feed is coated with a coating agent comprising a substance providing a cap-off property, wherein a fluorine base surfactant and/or a silicone base surfactant are added to an ink for the above writing instrument, and/or a substance which is solid at room temperature and has a solubility of 5% or less in an ink solvent at room temperature and which has a polar functional group is added to the coating agent, whereby the writing instrument having an excellent cap-off performance can be obtained.
Claims9
A writing instrument having an excellent cap-off performance in which a pen tip comprising a fibrous feed or a plastic feed is coated with a coating agent comprising a substance providing a cap-off property and which is solid at room temperature and has a solubility of 10% or less in an ink solvent at room temperature, and wherein an ink for the writing instrument contains an agent for improving a wetting property of the pen tip comprising at least one of a fluorine base surfactant and a silicone base surfactant.
A writing instrument having an excellent cap-off performance in which a pen tip comprising a fibrous feed or a plastic feed is coated with a coating agent comprising a substance providing a cap-off property, and wherein the coating agent contains a substance which is solid at room temperature and has a solubility of 10% or less in an ink solvent at room temperature, and an agent for improving a wetting property of the pen tip comprising a substance which is solid at room temperature and has a solubility of 5% or less in an ink solvent at room temperature and which has a polar functional group.
Dependencies are inferred from the claim text.