Method for producing pigment fragments with a predefined internal and/or external contour using a crack-forming layer, and pigment fragments

Patent metadata

Field	Value
Publication number	US-11802212-B2
Application number	US-201816649188-A
Country	US
Kind code	B2
Filing date	Jun 5, 2018
Priority date	Sep 21, 2017
Publication date	Oct 31, 2023
Grant date	Oct 31, 2023

Abstract

A method for producing pigments comprises the steps of creating a first layer on a substrate, structuring the first layer and detaching the pigments from the substrate. In the present case, the first layer is a crack-forming layer, so that the first layer is structured by the arising of cracks. Prior to detaching the pigments, a pigment layer is applied onto the first layer structured by the cracks.

First claim

The invention claimed is:

1. A method for producing pigments, comprising the steps of:
creating a first layer on a substrate;
structuring the first layer; and
detaching the pigments from the substrate;
wherein the first layer is a crack-forming layer so that the first layer is structured by the arising of cracks; and
prior to detaching the pigments, a pigment layer is applied onto the first layer structured by the cracks.

2. The method according to claim 1 , wherein the pigments comprise:
the pigment layer, or
the pigment layer and the first layer.

3. The method according to claim 1 , wherein the pigment layer is structured into a plurality of pigment sections by application to the structured first layer.

4. The method according to claim 1 , wherein the applied pigment layer lies with pigment sections on pigment islands of the first layer and with pigment residues in the cracks on the substrate.

5. The method according to claim 1 , wherein the first layer forms the cracks by itself, within the framework of a solidification of the first layer.

6. The method according to claim 1 , wherein the first layer and/or a method parameter is adapted within the framework of the crack formation to generate pigments of specified size, with sizes within a target size distribution.

7. The method according to claim 1 , wherein nucleus points for the crack formation are created in the form of partial recessions, in the substrate or the first layer, so that the shape of the pigments is determined by the nucleus points.

8. The method according to claim 1 , wherein the first layer is applied in several stripes.

9. The method according to claim 1 , wherein the pigment layer comprises several partial layers.

10. The method according to claim 1 , wherein a soluble layer is dissolved in the step of detaching the pigments from the substrate.

11. The method according to claim 10 , wherein the soluble layer is a partial layer of the substrate or the first layer.

12. The method according to claim 10 , wherein the soluble layer is water-soluble.

13. The method according to claim 1 , wherein the method comprises the further steps of:
bringing into contact the pigment layer with an intermediate substrate,
wherein the structured pigment layer adheres in sections to the intermediate substrate; and
separating intermediate substrate and substrate, wherein the pigments are detached from the substrate by the step of separating.

14. The method according to claim 13 , wherein at least the pigment layer adheres to a soluble layer of the intermediate substrate, which is arranged on a foil layer of the intermediate substrate.

Assignees

• Giesecke & Devrient Currency Technology Gmbh

Inventors

• Scherer Maik Rudolf Johann
• Scherer Kai Herrmann
• Dehmel Raphael
• Hunger Christoph

Classifications

• C09C3/04 Primary

  Physical treatment, e.g. grinding or treatment with ultrasonic vibrations {(C09C3/006 takes precedence)} · CPC title

• B31F1/07

  Embossing {, i.e. producing impressions formed by locally deep-drawing, e.g. using rolls provided with complementary profiles}({B31F1/128 takes precedence;} corrugating B31F1/20; embossing in combination with printing B41F19/02, B41M1/24; typewriters for embossing B41J3/38; stamping in combination with deforming B41K3/36) · CPC title

• B32B43/006

  Delaminating · CPC title

• B42D25/378

  Special inks · CPC title

• B42D25/40

  Manufacture · CPC title