US 12,351,748 B2
Partable laminate and method for parting long-term bonds
Philipp Preuss, Neu-Lankau (DE); and Arne Koops, Norderstedt (DE)
Assigned to TESA SE, Norderstedt (DE)
Filed by tesa SE, Norderstedt (DE)
Filed on Dec. 21, 2022, as Appl. No. 18/069,407.
Claims priority of application No. 10 2021 134 447.6 (DE), filed on Dec. 23, 2021.
Prior Publication US 2023/0203351 A1, Jun. 29, 2023
Int. Cl. C09J 7/38 (2018.01); C09J 7/24 (2018.01)
CPC C09J 7/385 (2018.01) [C09J 7/24 (2018.01); C09J 2301/124 (2020.08); C09J 2433/006 (2013.01)] 19 Claims
OG exemplary drawing
 
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.