Oil-based ink composition for writing utensils, writing utensil using same, and airbrush unit using same

Patent metadata

Field	Value
Publication number	US-12054622-B2
Application number	US-201917294523-A
Country	US
Kind code	B2
Filing date	Nov 19, 2019
Priority date	Nov 20, 2018
Publication date	Aug 6, 2024
Grant date	Aug 6, 2024

Abstract

Provided are an oil-based ink composition for writing utensils, a writing utensil using the same, and an airbrush unit using the same. The oil-based ink composition for writing utensils has good writing properties on writing surfaces of various materials and improved scratch resistance to scratches repeated or to scratches with stronger force on a marking after writing. The subject oil-based ink composition for writing utensils contains at least an aluminum pigment, a colorant, a resin, an organic solvent, and a polydimethylsiloxane, the polydimethylsiloxane having polyether-modifying groups at both ends, and a total number of hydroxyl groups on the polyether-modifying groups being 3 or greater.

First claim

The invention claimed is:

1. An oil-based ink composition for writing utensils, comprising at least an aluminum pigment, a colorant, a resin, an organic solvent, and a polydimethylsiloxane, the polydimethylsiloxane having polyether-modifying groups at both ends, and a total number of the hydroxyl groups on the polyether-modifying groups being 3 or greater, and
the oil-based ink composition being capable of producing a marking having metallic luster,
wherein at least one of the polyether-modifying groups has a hyperbranched molecular skeleton having two or more and 100 or less branches,
wherein a content of the polydimethylsiloxane is 0.005 to 10 mass % based on a total mass of the oil-based ink composition for writing utensils, and
wherein a content of the aluminum pigment is 0.3 mass % to 25 mass % based on the total mass of the oil-based ink composition for writing utensils.

2. The oil-based ink composition for writing utensils according to claim 1 , wherein the aluminum pigment is a leafing type aluminum pigment.

3. The oil-based ink composition for writing utensils according to claim 1 , wherein the oil-based ink composition exhibits adherence to a writing surface and scratch resistance.

4. The oil-based ink composition for writing utensils according to claim 1 , wherein the oil-based ink composition is capable of producing a marking which remains substantially unchanged after being scratched with a load of about 100 gf using a cotton swab.

Assignees

• Mitsubishi Pencil Co

Inventors

• Ikai Takayuki
• Haruhara Yumiko

Classifications

• B43K8/006

  using a spraying system, e.g. airbrushes · CPC title

• B05D7/02

  to macromolecular substances, e.g. rubber (treatment or coating of shaped articles made of macromolecular substances C08J7/00) · CPC title

• C09D11/18 Primary

  specially adapted for ball-point writing instruments · CPC title

• B43K8/00

  Pens with writing-points other than nibs or balls (brushes with reservoir for supplying substances A46B11/00) · CPC title

• B43K7/00

  Ball-point pens ({B43M11/085 takes precedence}; multiple-point writing implements B43K27/00) · CPC title