US 12,264,271 B2
Pressure-sensitive adhesive
Benjamin Pütz, Neuss (DE); and Sarah Zimmermann, Elmshorn (DE)
Assigned to tesa SE, Norderstedt (DE)
Filed by tesa SE, Norderstedt (DE)
Filed on Mar. 9, 2020, as Appl. No. 16/812,950.
Claims priority of application No. 10 2019 203 286.9 (DE), filed on Mar. 11, 2019.
Prior Publication US 2020/0291270 A1, Sep. 17, 2020
Int. Cl. C09J 7/38 (2018.01); C08F 18/08 (2006.01); C08F 220/06 (2006.01); C08F 220/18 (2006.01); C09J 123/02 (2006.01); C09J 133/08 (2006.01); C09J 169/00 (2006.01); C09J 193/04 (2006.01)
CPC C09J 7/385 (2018.01) [C08F 18/08 (2013.01); C08F 220/06 (2013.01); C08F 220/1804 (2020.02); C09J 123/02 (2013.01); C09J 133/08 (2013.01); C09J 169/00 (2013.01); C09J 193/04 (2013.01); C09J 2301/302 (2020.08)] 10 Claims
 
1. A pressure-sensitive adhesive comprising:
a) at least one poly(meth)acrylate;
b) at least one resin A selected from colophony resins and terpene-phenolic resins;
c) at least one hydrocarbon resin B1 having a softening point of greater than 50° C., determined according to ASTM E28 ring and ball; and
d) at least one hydrocarbon resin B2 having a softening point of less than or equal to 25° C., determined according to ASTM E28 ring and ball,
wherein the pressure-sensitive adhesive comprises the at least one resin A at a total concentration of 15 wt % to 30 wt %, based on a total weight of the pressure-sensitive adhesive,
wherein the at least one poly(meth)acrylate is a copolymer derived from the following monomer composition consisting of:
i) one or more alkyl acrylates having an alkyl radical comprising 1 to 4 carbons;
ii) 2-ethylhexyl acrylate at a total concentration of 30 wt % to 58 wt %, based on a total weight of the monomer composition; and
iii) acrylic acid.