Partable laminate and method for parting long-term structural bonds

Patent metadata

Field	Value
Publication number	US-2023279270-A1
Application number	US-202318178031-A
Country	US
Kind code	A1
Filing date	Mar 3, 2023
Priority date	Mar 4, 2022
Publication date	Sep 7, 2023
Grant date	—

Abstract

Laminates separated after long-term bonding and methods for separating laminates after long-term bonding is provided. The laminates comprise (a) a first adhesive layer, (b) a separation layer, and (c) a second adhesive layer, wherein 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. The first adhesive layer and/or the second adhesive layer may be laser beam-translucent or may comprise a reactive or latent-reactive adhesive.

First claim

What is claimed is:

1 . A laminate configured to be separated after long-term bonding, the laminate comprising:
a) a first adhesive layer; b) a separation layer; and c) a second adhesive layer, wherein the separation layer
comprises a laser-sensitive pigment which at the same time is coloring,
consists of a cured coating material which is at least partly removable by laser irradiation,
the first adhesive layer and/or the second adhesive layer is laser beam-translucent, and the first adhesive layer or the second adhesive layer, or the first adhesive layer and the second adhesive layer, comprises a reactive or latent-reactive adhesive.

2 . The laminate according to claim 1 , wherein the cured coating material of the separation layer comprises one or more radiation-curable systems comprising at least one unsaturated polyesters, epoxy acrylates, polyester acrylates, urethane acrylates, and aliphatic urethane acrylate oligomers.

3 . The laminate according to claim 1 , wherein the cured coating material of the separation layer comprises a cured acrylate coating material composition comprising:
to 80 wt % of a di- or trifunctional oligomer A, 0 to 20 wt % of a di- or trifunctional monomer B, 1 to 30 wt % of a difunctional monomer C, and 2 to 40 wt % of a coloring pigment.

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

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

6 . The laminate according to claim 5 , wherein when carbon black is present as laser-sensitive pigment, the carbon black is used at 2 to 7 wt %.

7 . The laminate according to claim 5 , wherein when titanium dioxide is present as laser-sensitive pigment, the titanium dioxide is used at 15 to 40 wt %.

8 . The laminate according to claim 1 , wherein the separation layer is applied in a thickness of 0.5 to 100 μm.

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

10 . The laminate according to claim 1 , wherein the first adhesive layer and the second adhesive layer consist of a reactive or latent-reactive adhesive.

11 . The laminate according to claim 1 , wherein the first adhesive layer or the second adhesive layer consists of a reactive or latent-reactive adhesive and at least one other adhesive of a pressure sensitive adhesive.

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

13 . The laminate according to claim 1 , wherein one adhesive layer of the first and second adhesive layers is a pressure sensitive adhesive comprising at least the following two components:
at 60 wt % to 90 wt %, in the adhesive, a first polymer component based on polyacrylate or a polyacrylate component; and at 10 wt % to 40 wt %, in the adhesive, a second polymer component, substantially immiscible with the polyacrylate component, based on elastomer, more particularly on a synthetic rubber or an elastomer component.

14 . A method for parting a long-term structural bond produced by means of the laminate according to claim 1 , wherein at least part of the area of the separation layer is removed by means of laser irradiation and the film laminate is separated into a first part-laminate and a second part-laminate.

15 . The method according to claim 14 , wherein forces are applied to at least one of the part-laminates that increase the spacing of the two part-laminates from one another.

16 . The method according to claim 1 , wherein an infrared laser is used for the laser irradiation.

17 . The method according to claim 1 , wherein the whole area of the separation layer is removed.

18 . A method comprising:
long-term structurally bonding at least two components together with the laminate according to claim 1 .

19 . The method according to claim 18 , wherein the at least two components are at least two automotive industry components or at least two electronics industry components.

Assignees

• Tesa Se

Inventors

• Preuss Philipp
• Koops Arne

Classifications

• C08K3/013 Primary

  Fillers, pigments or reinforcing additives · CPC title

• C08K2003/2241

  Titanium dioxide · CPC title

• C08K3/04

  Carbon · CPC title

• C08K5/0041

  Optical brightening agents, organic pigments · CPC title

• C09J2301/416

  use of irradiation · CPC title