Coating film for automobile exterior

Patent metadata

Field	Value
Publication number	US-12534794-B2
Application number	US-202318535744-A
Country	US
Kind code	B2
Filing date	Dec 11, 2023
Priority date	Jul 12, 2023
Publication date	Jan 27, 2026
Grant date	Jan 27, 2026

Abstract

Disclosed is a coating film preferably for automobile exterior including a substrate; an undercoat layer disposed on the substrate and including an undercoat composition; a metal layer deposited on the undercoat layer in an island structure and including aluminum (Al) and a low melting point metal; and a topcoat layer disposed on the metal layer and including a topcoat composition, wherein the undercoat composition may include a hexa-functional or higher urethane (meth)acrylate oligomer, a tri-functional urethane (meth)acrylate oligomer, a tetra-functional urethane (meth)acrylate oligomer, and a tri-functional or lower (meth)acrylate monomer, and the topcoat composition may include a hexa-functional or higher urethane (meth)acrylate oligomer, a bi-functional urethane (meth)acrylate oligomer, a penta-functional urethane (meth)acrylate oligomer, and a tri-functional or lower (meth)acrylate monomer.

First claim

What is claimed is:

1 . A coating film, comprising
a substrate; an undercoat layer disposed on the substrate and comprising an undercoat composition; a metal layer deposited in an island structure on the undercoat layer and comprising aluminum (Al) and a low melting point metal; and a topcoat layer disposed on the metal layer and comprising a topcoat composition, wherein the low melting point material comprises tin, indium, tin alloy, or a combination thereof, wherein the undercoat composition comprises a hexa-functional or higher urethane meth)acrylate oligomer, a tri-functional urethane (meth)acrylate oligomer, a tetra-functional urethane (meth)acrylate oligomer, and a tri-functional or lower (meth)acrylate monomer, and wherein the topcoat composition comprises a hexa-functional or higher urethane (meth)acrylate oligomer, a bi-functional urethane (meth)acrylate oligomer, a penta-functional urethane (meth)acrylate oligomer, and a tri-functional or lower (meth)acrylate monomer.

2 . The coating film of claim 1 , wherein
in the undercoat composition, the tri-functional urethane (meth)acrylate oligomer is included in a higher content than each of the hexa-functional or higher urethane (meth)acrylate oligomer and the tetra-functional urethane (meth)acrylate oligomer.

3 . The coating film of claim 1 , wherein
the undercoat composition includes 1 wt % to 8 wt % of the hexa-functional or higher urethane (meth)acrylate oligomer, 10 wt % to 20 wt % of the tri-functional urethane (meth)acrylate oligomer, 5 wt % to 15 wt % of the tetra-functional urethane (meth)acrylate oligomer, and 15 wt % to 25 wt % of the tri-functional or lower (meth)acrylate monomer based on a total amount of the undercoat composition.

4 . The coating film of claim 1 , wherein
the hexa-functional or higher urethane (meth)acrylate oligomer in the undercoat composition has a weight average molecular weight of 500 g/mol to 3,000 g/mol, and a viscosity at 60° C. of 1,000 cP to 4,000 cP.

5 . The coating film of claim 1 , wherein
the tri-functional urethane (meth)acrylate oligomer in the undercoat composition has a weight average molecular weight of 1,500 g/mol to 3,000 g/mol and a viscosity at 60° C. of 10,000 cP to 30,000 cP.

6 . The coating film of claim 1 , wherein
the tetra-functional urethane (meth)acrylate oligomer in the undercoat composition has a weight average molecular weight of 500 g/mol to 2,000 g/mol and a viscosity at 60° C. of 1,000 cP to 3,500 cP.

7 . The coating film of claim 1 , wherein
the tri-functional or lower (meth)acrylate monomer in the undercoat composition includes 5 wt % to 15 wt % of a bi-functional (meth) crylate monomer and 5 wt % to 15 wt % of tri-functional (meth)acrylate monomer based on a total amount of the undercoat composition.

8 . The coating film of claim 1 , wherein
a thickness of the undercoat layer is 10 μm to 25 μm.

9 . The coating film of claim 1 , wherein
a thickness of the metal layer is 0.02 μm to 0.1 μm.

10 . The coating film of claim 1 , wherein
the topcoat composition includes 1 wt % to 8 wt % of the hexa-functional or higher urethane (meth)acrylate oligomer, 5 wt % to 15 wt % of the bi-functional urethane (meth)acrylate oligomer, 5 wt % to 15 wt % of the penta-functional urethane (meth)acrylate oligomer, and 18 wt % to 28 wt % of the tri-functional or lower (meth)acrylate monomer based on a total amount of the topcoat composition.

11 . The coating film of claim 1 , wherein
the hexa-functional or higher urethane (meth)acrylate oligomer in the topcoat composition has a weight average molecular weight of 500 g/mol to 5,000 g/mol and a viscosity at 60° C. of 1,000 cP to 5,000 cP.

12 . The coating film of claim 1 , wherein
the bi-functional urethane (meth)acrylate oligomer in the topcoat composition has a weight average molecular weight of 5,000 g/mol to 20,000 g/mol and a viscosity at 60° C. of 10,000 cP to 20,000 cP.

13 . The coating film of claim 1 , wherein
the penta-functional urethane (meth)acrylate oligomer in the topcoat composition has a weight average molecular weight of 5,000 g/mol to 10,000 g/mol, and a viscosity at 60° C. of 500 cP to 3,000 cP.

14 . The coating film of claim 1 , wherein
the tri-functional or lower (meth)acrylate monomer in the topcoat composition includes 1 wt % to 5 wt % of a mono-functional urethane (meth)acrylate monomer and 15 wt % to 25 wt % of a tri-functional (meth)acrylate monomer based on a total amount of the topcoat composition.

15 . The coating film of claim 1 , wherein
a thickness of the topcoat layer is 10 μm to 25 μm.

16 . The coating film of claim 1 , wherein
the undercoat composition and topcoat composition are ultraviolet curable paint compositions.

17 . The coating film of claim 1 , wherein
the metal layer is formed by vacuum deposition.

18 . A vehicle comprising the coating film of claim 1 .

Assignees

• Hyundai Motor Co Ltd
• Kia Corp
• Kcc Corp

Inventors

• Ha Jaehwan
• Park Kyuyeob
• Park Changman
• Lee Changhui

Classifications

• C23C14/58

  After-treatment · CPC title

• C23C14/20

  on organic substrates · CPC title

• C23C14/024 Primary

  Deposition of sublayers, e.g. to promote adhesion of the coating (C23C14/027 takes precedence) · CPC title

• C23C14/24 Primary

  Vacuum evaporation · CPC title

• C09D5/00

  Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced {(electrically insulating plastics, resins or waxes H01B3/30)}; Filling pastes · CPC title