Pressure-sensitive adhesive

Patent metadata

Field	Value
Publication number	US-12264271-B2
Application number	US-202016812950-A
Country	US
Kind code	B2
Filing date	Mar 9, 2020
Priority date	Mar 11, 2019
Publication date	Apr 1, 2025
Grant date	Apr 1, 2025

Abstract

Pressure-sensitive adhesives, adhesive tapes, and methods enable high bond strengths on non-polar or rough substrates. The pressure-sensitive adhesives and methods comprise (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., and (d) at least one hydrocarbon resin B2 having a softening point of less than or equal to 25° C. The adhesive tapes comprise one or more layers of the pressure-sensitive adhesives, and the methods may produce adhesive bonds on substrates with low surface energy and/or on substrates with a mean roughness of at least 5 μm.

First claim

The invention claimed is:

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.

2. The pressure-sensitive adhesive of claim 1 , wherein the monomer composition comprises acrylic acid at 0.5 to 5 wt %, based on the total weight of the monomer composition.

3. The pressure-sensitive adhesive of claim 1 , wherein the at least one resin A is a terpene-phenolic resin.

4. The pressure-sensitive adhesive of claim 1 , wherein the pressure-sensitive adhesive comprises the at least one hydrocarbon resin B1 at a total concentration of 10 wt % to 25 wt %, based on the total weight of the pressure-sensitive adhesive.

5. The pressure-sensitive adhesive of claim 1 , wherein the pressure-sensitive adhesive comprises the at least one hydrocarbon resin B2 at a total concentration of 5 wt % to 15 wt %, based on the total weight of the pressure-sensitive adhesive.

6. An adhesive tape comprising the pressure-sensitive adhesive of claim 1 .

7. A method comprising at least one of:
bonding a first substrate to a second substrate with the pressure-sensitive adhesive of claim 1 ; or
adhesively bonding the adhesive tape of claim 6 to the first substrate and the second substrate,
wherein at least one substrate has at least one of a low surface energy and a mean roughness of at least 5 μm, wherein the at least one substrate is at least one selected from the first substrate, and the second substrate.

8. The pressure-sensitive adhesive of claim 1 , wherein the 2-ethylhexyl acrylate is present at a total concentration of 30 wt % to 49.5 wt %, based on the total weight of the monomer composition.

9. The pressure-sensitive adhesive of claim 1 , wherein the monomer composition consists of:
n-butyl acrylate;
the 2-ethylhexyl acrylate; and
the acrylic acid.

10. The pressure-sensitive adhesive of claim 9 , wherein all poly(meth)acrylate(s) of the at least one poly(meth)acrylate has a weight-average molar mass of 500,000 to 5,000,000 g/mol.

Assignees

• Tesa Se

Inventors

• Pütz Benjamin
• Zimmermann Sarah

Classifications

• C09J2301/302

  the adhesive being pressure-sensitive, i.e. tacky at temperatures inferior to 30°C · CPC title

• C09J193/04

  Rosin · CPC title

• C09J169/00

  Adhesives based on polycarbonates; Adhesives based on derivatives of polycarbonates · CPC title

• C09J133/08

  Homopolymers or copolymers of acrylic acid esters · CPC title

• C09J123/02

  not modified by chemical after-treatment · CPC title