Decorative coating film

Patent metadata

Field	Value
Publication number	US-12018353-B2
Application number	US-202117180143-A
Country	US
Kind code	B2
Filing date	Feb 19, 2021
Priority date	Dec 22, 2017
Publication date	Jun 25, 2024
Grant date	Jun 25, 2024

Abstract

The present disclosure provides a decorative coating film, which ensures and/or maintains millimeter wave transmission properties even though the decorative coating film is continuously used. The present disclosure relates to a decorative coating film formed on the surface of a resin substrate positioned in the pathway of a radar device, wherein the decorative coating film at least comprises: fine silver particles or fine silver alloy particles, nickel oxide, and a binding resin having light transmission properties, which binds the fine silver particles or the fine silver alloy particles dispersed in the decorative coating film with one another, wherein the shape of the nickel oxide is a wire shape.

First claim

What is claimed is:

1. A system, comprising:
a radar device configured to emit a beam of millimeter waves; and
a resin substrate having a surface positioned in a pathway of the beam,
wherein a decorative coating film is formed on the surface of the resin substrate,
the decorative coating film comprises:
silver particles or silver alloy particles;
nickel oxide; and
a binding resin having light transmission properties, which binds the silver particles or the silver alloy particles dispersed in the decorative coating film with one another,

a shape of the nickel oxide is a wire shape,
the silver particles or silver alloy particles have a mean particle diameter of 2 to 200 nm, and
a length of the wire shape of the nickel oxide is 100 to 250 nm.

2. The system according to claim 1 , wherein an aspect ratio of the wire shape is 3 or greater, and a diameter of the wire shape is 1 nm to 20 nm.

3. The system according to claim 1 , wherein the fine silver particles or the silver alloy particles are silver particles, and an amount of the nickel oxide is 1.5% by mass to 35.0% by mass as nickel with respect to a mass of silver.

4. The system according to claim 1 , wherein an aspect ratio of the wire shape is 50 or greater.

5. The system according to claim 1 , wherein an aspect ratio of the wire shape is 100 or greater.

6. The system according to claim 1 , wherein a diameter of the wire shape is 1 nm to 10 nm.

7. The system according to claim 1 , wherein a crystallite diameter of the silver particles or silver alloy particles is 2 nm to 98 nm.

8. The system according to claim 1 , wherein the binding resin comprises one selected from the group consisting of an acrylic resin, a polycarbonate resin, a polyethylene terephthalate resin, an epoxy resin, and a polystyrene resin.

9. The system according to claim 1 , wherein an amount of the silver particles or silver alloy particles in the decorative coating film is 83% by mass to 99% by mass when a total mass of the decorative coating film is considered 100 mass %.

10. The system according to claim 1 , wherein the resin substrate is a portion of a grill of an automobile.

11. The system according to claim 1 , wherein the binding resin is a polymeric resin having electrical insulation.

Assignees

• Toyota Motor Co Ltd

Inventors

• Hara Toshimasa
• Murai Junya

Classifications

• B22F1/056

  Submicron particles having a size above 100 nm up to 300 nm · CPC title

• B22F1/10

  Metallic powder containing lubricating or binding agents; Metallic powder containing organic material · CPC title

• B22F1/054

  Nanosized particles · CPC title

• C08J7/043

  Improving the adhesiveness of the coatings per se, e.g. forming primers (adhesives in the form of films or foils characterised by the primer layers between the polymer carriers and the adhesives C09J7/50) · CPC title

• C08J7/0427

  with only one layer of a composition containing a polymer binder (with more layers C08J7/042) · CPC title