Partable laminate and method for parting long-term bonds

Patent metadata

Field	Value
Publication number	US-12351748-B2
Application number	US-202218069407-A
Country	US
Kind code	B2
Filing date	Dec 21, 2022
Priority date	Dec 23, 2021
Publication date	Jul 8, 2025
Grant date	Jul 8, 2025

Abstract

Laminates designed and equipped to be separated after long-term bonding are provided. The laminates comprise a first pressure sensitive adhesive layer, a separation layer, and a second pressure sensitive adhesive layer. The separation layer comprises a laser-sensitive pigment which at the same time is coloring, and so preferably a black coloration is produced, and consists of a cured coating material, preferably an electron beam-cured or UV-cured coating material, which is at least partly removable by laser irradiation, wherein the first pressure sensitive adhesive layer and/or the second pressure sensitive adhesive layer are laser beam-translucent.

First claim

What is claimed is:

1. A laminate configured to be separated after long-term bonding, the laminate comprising:
a) a first pressure sensitive adhesive layer;
b) a separation layer; and
c) a second pressure sensitive adhesive layer,
wherein
the separation layer comprises
a laser-sensitive pigment that provides a visible coloring to the separation layer, and
a cured coating material which is at least partly removable by laser irradiation,

the first pressure sensitive adhesive layer and/or the second pressure sensitive adhesive layer being laser beam-translucent, and
the cured coating material comprises a cured acrylate coating material composition comprising the following composition:
30 to 80 wt % of a trifunctional oligomer A,
0 to 20 wt % of a trifunctional monomer B,
1 to 30 wt % of a difunctional monomer C, and
2 to 40 wt % of a coloring pigment.

2. The laminate according to claim 1 , wherein the cured coating material of the separation layer is formed from one or more radiation-curable resins.

3. The laminate according to claim 2 , wherein the one or more radiation-curable resins comprise at least one of unsaturated polyesters, epoxy acrylates, polyester acrylates, and urethane acrylates.

4. The laminate according to claim 1 , wherein the laser-sensitive pigment is admixed in an amount of at least 1 wt % up to not more than 40 wt %, based on a total weight of the cured coating material of the separation layer.

5. The laminate according to claim 4 , wherein the laser-sensitive pigment is admixed in an amount from at least 5 to 15 wt %, based on the total weight of the cured coating material of the separation layer.

6. The laminate according to claim 1 , wherein the laser-sensitive pigment comprises carbon black or titanium dioxide.

7. The laminate according to claim 6 , wherein, if carbon black is present as the laser-sensitive pigment, the carbon black is present in an amount from 2 to 7 wt %.

8. The laminate according to claim 6 , wherein, if titanium dioxide is present as the laser-sensitive pigment, and the titanium dioxide is present in an amount from 15 to 40 wt %.

9. The laminate according to claim 8 , wherein the titanium dioxide is present in an amount from at least 22 to 28 wt % or the separation layer is applied in a thickness of 5 to 25 μm.

10. The laminate according to claim 1 , wherein the separation layer is applied in a thickness from at least 0.5 to 100 μm.

11. The laminate according to claim 1 , wherein the separation layer consists of a single coating material layer.

12. The laminate according to claim 1 , wherein at least one of the first pressure sensitive adhesive layer and the second pressure sensitive adhesive layer contains at least 40 wt % of one or more poly(meth)acrylates.

13. The laminate according to claim 1 , wherein at least one of the first pressure sensitive adhesive layer and the second pressure sensitive adhesive layer is a pressure sensitive adhesive which comprises at least the following two components:
a polyacrylate component present in an amount from at least 60 wt % to 90 wt %, and
an elastomer component present in an amount from at least 10 wt % to 40 wt %.

14. The laminate according to claim 1 , wherein the laser-sensitive pigment is black or the separation layer is black.

15. A method for parting a long-term bond produced by means of the laminate according to claim 1 , the method comprising:
removing at least part of an area of the separation layer by means of laser irradiation such that the laminate separates into a first part-laminate and a second part-laminate.

16. The method according to claim 15 , wherein forces are applied to at least one of the first part-laminate and the second part-laminate that increase the spacing of the two part-laminates from one another.

17. The method according to claim 15 , wherein an infrared laser is used for the laser irradiation.

18. The method according to claim 15 , wherein an entire area of the separation layer is removed.

19. A method comprising:
bonding at least two components together with the laminate according to claim 1 such that the at least two components are separatable on demand, wherein at least two components consist of different materials and are components usable in the automotive industry and/or the electronics industry.

Assignees

• Tesa Se

Inventors

• Preuss Philipp
• Koops Arne

Classifications

• C09J7/24 Primary

  based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds · CPC title

• C09J2301/124

  the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape · CPC title

• C09J2433/006

  in the substrate · CPC title

• C08K2003/2241

  Titanium dioxide · CPC title

• C09J2203/354

  for automotive applications · CPC title