Method for providing a substrate with a tint and a functional coloring

Inventors: Jonas Bemetz (Munich, DE); Herbert Zinner (Rohrbach, DE); Udo Weigand (Munich, DE); Tobias Breu (Zwiesel, DE); Katrin Metz (Munich, DE); Beate Wind (Regen, DE); Christian Dorner (Zwiesel, DE)

Assignee: Rodenstock GmbH

B29D11/00923 B29D11/00653 B29D11/00903 G02C7/102 G02C7/108

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Quick Facts

Patent No.: US 12703162
App. No.: 18/861,628
Granted: Aug 11, 2026
Kind: B2

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Abstract

The present invention relates to a method for providing a substrate with a tint and a functional coloring, comprising the following steps (a) to (c) in this order: (a) providing a substrate to be provided with a tint and a functional coloring, the substrate being made of plastic glass and the substrate having a first main side and a second main side with a convex shape opposite the first main side, (b) applying a tint to both main sides of the substrate provided in step (a), and (c) applying a functional coloring to both main sides of the substrate provided with a tint on both main sides in step (b) by dip coating, thereby obtaining a substrate provided with a tint and a functional coloring on both main sides.

Claims (11)

1 . A method for providing a substrate with a tint and a functional coloring, comprising the following steps (a) to (c) in this order:

(a) providing a substrate to be provided with a tint and a functional coloring, the substrate being made of plastic glass and the substrate having a first main side and a second main side with a convex shape opposite the first main side,

(b) applying a tint to both main sides of the substrate provided in step (a), wherein the application of the tint in step (b) is carried out by immersing the substrate in a dyeing tank containing at least one non-functional dye dissolved or dispersed in a liquid medium, and

(c) applying a functional coloring to both main sides of the substrate provided with a tint on both main sides in step (b) by dip coating, wherein the functional coloring is caused by at least one photochromic dye, and the substrate provided with a tint on both main sides is immersed in a photoresist containing the at least one photochromic dye, whereby the photoresist forms a polymeric layer on the substrate and a substrate provided with a tint and a functional coloring on both main sides is obtained, wherein the polymeric layer having the functional coloring is not removed from both main sides of the substrate.

2 . The method according to claim 1 , wherein the substrate provided in step (a) is made of polythiourethane, polymethyl methacrylate, polycarbonate, polyacrylate, polydiethylene glycol bisallyl carbonate or a combination thereof.

3 . The method according to claim 1 , wherein the substrate provided in step (a) is a finished part with a concave shape of the first main side, which does not require surface machining.

4 . The method according to claim 1 , wherein the substrate provided in step (a) is a half-part with a planar or concave shape of the first main side, which is subjected to surface machining prior to step (b).

5 . The method according to claim 4 , wherein surface machining is carried out by milling, grinding, polishing or a combination thereof.

6 . The method according to claim 1 , further comprising the following step (d):

applying one or more finishing layers to at least one of the two main sides of the substrate obtained in step (c), which is provided with a tint and a functional coloring on both main sides.

7 . The method according to claim 6 , wherein the substrate provided with a tint and a functional coloring on both main sides is immersed in a hard lacquer for applying a hard layer.