Decorative coating excluding a base hard-coat

Patent metadata

Field	Value
Publication number	US-12577652-B2
Application number	US-202218261022-A
Country	US
Kind code	B2
Filing date	Jan 12, 2022
Priority date	Jan 14, 2021
Publication date	Mar 17, 2026
Grant date	Mar 17, 2026

Abstract

The disclosure refers to a method for producing a coated plastic article, the method comprising:
nnnnn. providing a plastic substrate having at least a first and second surface; ooooo. depositing on the plastic substrate a decorative coating comprising a metal or metal alloy layer, using physical vapor deposition; and ppppp. applying a protective coating to at least the first surface of the plastic article, wherein there is no plasma pre-treatment of the plastic substrate prior to deposition of the decorative coating. Further, the disclosure refers to a coated plastic article comprising; a plastic substrate having a first and second surface, a decorative coating comprising a metal or metal alloy layer deposited directly on the plastic substrate and a protective coating applied to the first surface of the plastic article, wherein the residual stress of the decorative coating is tensile, and the coated plastic article passes the SAEJ2527 accelerated UV test.

First claim

The invention claimed is:

1 . A method for producing a coated plastic article, the method comprising:
providing a plastic substrate having at least a first surface and a second surface, wherein the plastic substrate is polycarbonate; depositing on the first surface of the polycarbonate plastic substrate a decorative coating comprising a metal alloy layer, using physical vapor deposition; and applying a protective coating to at least the first surface of the plastic article, wherein there is no plasma pre-treatment of the polycarbonate plastic substrate prior to deposition of the decorative coating, wherein the metal alloy layer of the decorative coating is deposited directly on the polycarbonate plastic substrate under conditions that result in a tensile residual film stress of the decorative coating, and wherein the residual film stress displacement of the decorative coating is less than or equal to −50 μm, and wherein the metal alloy layer comprises chromium and zirconium.

2 . The method of claim 1 , wherein the decorative coating is deposited under conditions that result in a residual film stress displacement of the decorative coating of less than or equal to −240 μm.

3 . The method of claim 1 , wherein the decorative coating is deposited under conditions that result in a residual film stress displacement of the decorative coating of less than or equal to −765 μm.

4 . The method of claim 1 , wherein the protective coating is a hard-coating.

5 . The method of claim 1 , wherein the protective coating is an ultraviolet blocking coating.

6 . The method of claim 1 , wherein the protective coating is applied to the decorative coating.

7 . The method of claim 1 , wherein the protective coating is applied to the decorative coating and the opposing surface of the plastic substrate.

8 . The method of claim 1 , wherein the decorative coating comprises an adhesion promoting layer.

9 . The method of claim 1 , wherein the decorative coating comprises an optical modifying layer.

10 . The method of claim 8 , wherein the adhesion promoting layer is transparent.

11 . The method of claim 9 , wherein the optical modifying layer is transparent.

12 . The method of claim 8 , wherein the adhesion promoting layer comprises silicon.

13 . The method of claim 9 , wherein the optical modifying layer comprises silicon.

14 . The method of claim 12 , wherein the adhesion promoting layer is deposited in the presence of oxygen.

15 . The method of claim 13 , wherein the optical modifying layer is deposited in the presence of oxygen.

16 . The method of claim 8 , wherein the deposited adhesion promoting layer is silicon dioxide.

17 . The method of claim 9 , wherein the deposited optical modifying layer is silicon dioxide.

18 . The method of claim 1 , wherein the provided plastic substrate comprises visible texturing prior to deposition of the decorative coating.

19 . The method of claim 1 , further comprising providing a visible texturing to the plastic substrate.

20 . The method of claim 1 , further comprising providing two visually distinct textures to the plastic substrate.

21 . The method of claim 1 , wherein the plastic substrate has been injection molded or is formed of a plastic which is capable of being injection molded.

22 . The method of claim 1 , wherein the metal alloy layer of the decorative coating is deposited directly on the polycarbonate plastic substrate without a base hard-coat being previously applied to the plastic substrate.

23 . The method of claim 1 , wherein the residual stress of the coated plastic article is tensile.

Assignees

• Motherson Innovations Co Ltd

Inventors

• Edwards Scott
• Field Simon David
• Stoehr Bastian

Classifications

• C23C14/024

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

• C23C14/0015

  characterized by the colour of the layer · CPC title

• C23C14/20 Primary

  on organic substrates · CPC title