Radio wave transmissive metallic member and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-12305285-B2
Application number	US-202318191524-A
Country	US
Kind code	B2
Filing date	Mar 28, 2023
Priority date	Apr 14, 2022
Publication date	May 20, 2025
Grant date	May 20, 2025

Abstract

The present disclosure provides a radio wave transmissive metallic member having an excellent metallic luster. The present disclosure relates to a metallic member and a method for manufacturing the same. The metallic member comprises a substrate body, an ion-exchange resin layer formed on the substrate body, and a metal particle layer formed on the ion-exchange resin layer, wherein metal particles having a high aspect ratio are longitudinally oriented with respect to the ion-exchange resin layer and the substrate body.

First claim

What is claimed is:

1. A metallic member comprising:
a substrate body;
an ion-exchange resin layer formed on the substrate body; and
a metal particle layer formed on the ion-exchange resin layer,
wherein gaps are provided between metal particles in the metal particle layer,
wherein a maximum length a (nm) in a horizontal direction of the metal particle, a maximum length b (nm) in a perpendicular direction of the metal particle, and a length c (nm) in the perpendicular direction of a portion embedded into the ion-exchange resin layer of the metal particle satisfy 1.5 nm≤a≤200 nm, b/a≥1.25, and c≥0 in a cross-sectional surface of the metallic member, and
wherein an inclination θ (°) of the metal particle with respect to a bottom surface of the ion-exchange resin layer satisfies 60°≤θ≤90° in the cross-sectional surface of the metallic member.

2. The metallic member according to claim 1 , wherein a metal of the metal particle is one or more metals selected from Ag, Al, Au, Ti, Cr, Mn, Fe, Ni, Cu, Zn, Zr, Nb, Mo, In, Co, and Sn.

3. The metallic member according to claim 2 , wherein the metal of the metal particle is Ag.

4. The metallic member according to claim 1 , wherein an ion-exchange resin of the ion-exchange resin layer is a resin with a carboxyl group and/or a sulfo group.

5. The metallic member according to claim 4 , wherein the ion-exchange resin of the ion-exchange resin layer is polyamic acid.

6. The metallic member according to claim 1 , wherein at least a part of a surface of the metal particle is coated with a polymer for adsorbing to a metal surface.

7. The metallic member according to claim 6 , wherein a weight average molecular weight of the polymer for adsorbing to a metal surface is from 10000 to 360000.

8. The metallic member according to claim 6 , wherein the polymer for adsorbing to a metal surface is at least one selected from a polyvinyl-based polymer, a polyethylene glycol-based polymer, and a polyacrylic acid-based polymer.

9. A method for manufacturing the metallic member according to claim 1 , comprising:
forming an ion-exchange resin layer on a surface of a substrate body;
treating the ion-exchange resin layer with a solution containing metal ions to introduce the metal ions to the ion-exchange resin layer; and
treating the ion-exchange resin layer to which the metal ions are introduced with a solution containing 0.1 mM to 500 mM of a polymer for adsorbing to a metal surface and 0.01 mM to 10 mM of a reducing agent to reduce the metal ions and deposit metal particles on a surface of the ion-exchange resin layer.

Assignees

• Toyota Motor Co Ltd

Inventors

• KUBOYAMA Daiki
• Murai Jyunya
• Nishijima Hiroki
• Shionoya Miwako

Classifications

• H01Q1/38

  formed by a conductive layer on an insulating support {(patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface  H01Q15/142)} · CPC title

• C23C18/28

  Sensitising or activating · CPC title

• C23C18/40

  using reducing agents · CPC title

• C23C18/34

  using reducing agents · CPC title

• C23C18/44 Primary

  using reducing agents · CPC title