# US 11,305,312 B2 · Method for manufacturing a transparent vehicle part

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- Number: US 11,305,312 B2
- Document ID: US11305312B2
- Status: Granted
- Kind: B2
- Application number: 16/985,427
- Filed: 2020-08-05
- Published: 2021-02-11
- Granted: 2022-04-19
- Earliest claimed: 2019-08-05
- Assignees: Compagnie Plastic Omnium
- Applicants: Compagnie Plastic Omnium SE
- Inventors: Sophie Vidal; Stéphane Guillier
- Web page: https://patentgrep.com/patent/US11305312B2

## CPC

- B05D 7/02: to macromolecular substances, e.g. rubber (treatment or coating of shaped articles made of macromolecular substances C08J7/00)
- B05D 7/56: {Three layers or more}
- B05D 3/06: by exposure to radiation (B05D3/02 takes precedence {; plasma treatment B05D3/141})
- B05D 3/068: {using ionising radiations (gamma, X, electrons)}
- B05D 3/12: by mechanical means
- B05D 5/06: to obtain multicolour or other optical effects (B05D5/02 takes precedence)
- B05D 7/57: {the last layer being a clear coat}
- B44C 1/228: {by laser radiation}
- B44F 1/06: produced by transmitted light, e.g. transparencies, imitations of glass paintings
- B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02)
- B44C: PRODUCING DECORATIVE EFFECTS (processes for applying liquids or other fluent materials to surfaces, in general B05D; shaping of plastics or substances in a plastic state B29C; printing processes to produce transfer pictures B41M3/12; thermographic duplication or marking methods B41M5/00); MOSAICS; TARSIA WORK (imitation of mosaic or tarsia work patterns B44F11/04); PAPERHANGING {(labels G09F; multi-step processes for making paper labels or tags B31D1/02)}
- B44F: SPECIAL DESIGNS OR PICTURES

## Abstract

In this method for manufacturing a vehicle part, the following steps are implemented, applying a paint coat to a transparent part, applying a first varnish coat to the paint coat, irradiating the paint coat and the first varnish coat in part with laser radiation so as to etch the paint coat and the first varnish coat, applying a transparent primer coat to the first varnish coat, and applying a second varnish coat to the transparent primer coat.

## Claims

### Claim 1

A method for manufacturing a transparent external vehicle part, characterized in that it comprises the following successive steps:
applying a paint coat, which does not permit transmission of visible light, to a transparent external vehicle part,
applying a first varnish coat, which permits transmission of visible light, to the paint coat,
irradiating the paint coat and the first varnish coat in part with laser radiation so as to etch through the paint coat and the first varnish coat and expose a portion of the transparent external vehicle part,
applying a transparent primer coat, which does not prevent transmission of visible light, to the first varnish coat and the portion of the transparent external vehicle part, and
applying a second varnish coat, which permits transmission of visible light, to the transparent primer coat.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the transparent external vehicle part is manufactured by molding a plastic.

### Claim 3 (depends on 2)

The method according to claim 2, wherein the plastic is one of polycarbonate, polypropylene, or poly(methyl methacrylate).

### Claim 4 (depends on 1)

The method according to claim 1, wherein the laser radiation has a wavelength within the infrared.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the laser radiation has a wavelength within the near infrared.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the first and second varnish coats are made of a material that is capable of absorbing or reflecting ultraviolet radiation.

### Claim 7 (depends on 1)

The method according to claim 1, wherein the first varnish coat is transparent to any laser radiation having a wavelength within the near infrared.

### Claim 8 (depends on 1)

The method according to claim 1, wherein the first and second varnish coats are made of a same material.

### Claim 9 (depends on 1)

The method according to claim 1, wherein the paint coat comprises an opacifying primer undercoat.

### Claim 10 (depends on 1)

The method according to claim 1, wherein the transparent external vehicle part is polished after the irradiation step.

### Claim 11 (depends on 1)

The method according to claim 1, wherein the transparent external vehicle part is a protective cover for a vehicle light source.