DETACHABLE ADHESIVE STRIP

• US 20150337177A1
• Filed: 12/05/2013
• Published: 11/26/2015
• Est. Priority Date: 12/19/2012
• Status: Active Grant

• Current Assignee: Tesa SE (Maxingvest AG)
• Original Assignee: Tesa SE (Maxingvest AG)
• Inventors: KRAWINKEL, Thorsten, SCHERF, Lesmona, PETERSEN, Anika, DOLLASE, Thilo
• Granted Patent: US 11,084,958 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: C08K 5/01 Hydrocarbons C08K5/0091 takes precedence
• CPC Class Codes: C09J 153/02 Vinyl aromatic monomers and conjugated dienes
• CPC Class Codes: C09J 2301/124 the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape
• CPC Class Codes: C09J 2301/308 the adhesive tape or sheet losing adhesive strength when being stretched, e.g. stretch adhesive
• CPC Class Codes: C09J 2301/408 additives as essential feature of the adhesive layer
• CPC Class Codes: C09J 2453/00 Presence of block copolymer
• CPC Class Codes: C09J 2475/006 in the substrate
• CPC Class Codes: C09J 7/22 Plastics; Metallised plastics
• CPC Class Codes: C09J 7/25 based on macromolecular compounds obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds
• CPC Class Codes: C09J 7/38 Pressure-sensitive adhesives [PSA]
• CPC Class Codes: C09J 7/381 based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
• CPC Class Codes: Y10T 428/266 of base or substrate
• CPC Class Codes: Y10T 428/2848 Three or more layers
• CPC Class Codes: Y10T 428/2861 having readily strippable combined with readily readhearable properties [e.g., stick-ons, etc.]
• CPC Class Codes: Y10T 428/2878 including addition polymer from unsaturated monomer

Abstract

The invention relates to an adhesive film strip comprising at least two, particularly three, layers, which adhesive film strip can be detached without residues and nondestructively by expansive stretching substantially in the adhesion plane, with a carrier on which a first external adhesive compound layer is present on at least one side, wherein the adhesive compound layer consists of adhesive compound formed on the basis of vinyl aromatic block copolymers and adhesive resins, wherein at least 75% of the resin (relative to the overall resin content) is selected with a DACP (diacetone alcohol cloud point) of greater than −20° C., preferably greater than 0° C., and the carrier has at least one layer made from a polyurethane with an elongation at break of at least 100% and a restoring power of more than 50%. A nonpolar hydrocarbon resin or a polyterpene resin is particularly used as the tackifier for the adhesive compound(s).

Claims

1. A pressure-sensitive adhesive film strip comprising at least two, which can be detached again without leaving a residue and without causing damage by expansive stretching substantially in the adhesion plane, having a carrier on which a first, outer adhesive composition layer is present at least on one side, wherein

the adhesive composition layer comprises an adhesive composition which is based on vinyl aromatic block copolymers and adhesive resins, wherein at least 75% (based on the total amount of resin) of the resin is chosen with a DACP (diacetone alcohol cloud point) of greater than −

20°

C., and

the carrier has at least one layer which comprises a polyurethane having an elongation at break of at least 100% and a resilience of over 50%.

2. The pressure-sensitive adhesive film strip as claimed in claim 1,

wherein

the carrier is provided on both sides with an adhesive composition layer, wherein the second adhesive composition layer is optionally likewise based on vinyl aromatic block copolymers and adhesive resins.

3. The pressure-sensitive adhesive film strip as claimed in claim 1,

wherein

the first and second adhesive composition layers have identical compositions.

4. The pressure-sensitive adhesive film strip as claimed in claim 1,

wherein

the carrier comprises only a single layer.

5. The pressure-sensitive adhesive film strip as claimed in claim 1,

wherein

there are used as pressure-sensitive adhesive compositions those based on block copolymers comprising polymer blocks formed predominantly of vinyl aromatic compounds (A blocks), and those formed predominantly by polymerization of 1,3-dienes (B blocks), or a copolymer of the two.

6. The pressure-sensitive adhesive film strip as claimed in claim 1,

wherein

the block copolymers of the pressure-sensitive adhesive compositions have a content of polyvinyl aromatic compounds of from 10 wt. % to 35 wt. %.

7. The pressure-sensitive adhesive film strip as claimed in claim 1,

wherein

the block copolymers of the pressure-sensitive adhesive compositions have polystyrene end blocks.

8. The pressure-sensitive adhesive film strip as claimed in claim 1,

wherein

the amount of vinyl aromatic block copolymer,

based on the total pressure-sensitive adhesive composition, is from 20 to 70 wt. %.

9. The pressure-sensitive adhesive film strip as claimed in claim 1,

wherein

at least 75 wt. % of the adhesive resins are hydrocarbon resins or terpene resins or a mixture thereof.

10. The pressure-sensitive adhesive film strip as claimed in claim 1,

wherein

the polyurethane of the carrier layer is a polyether urethane or a polyester urethane.

11. The pressure-sensitive adhesive film strip as claimed in claim 1,

wherein

the carrier layer is from 10 to 200 μ

m thick.

13. A method of bonding an object to a substrate, said method comprising bonding said object to said substrate via the pressure-sensitive adhesive film strip as claimed in claim 1.

12. A pressure-sensitive adhesive film strip comprising a single-layer carrier of a polyurethane, wherein the carrier has an elongation at break of at least 100% and a resilience of over 50%, wherein

there is applied to both sides of the carrier an adhesive composition layer of an adhesive composition which is based on vinyl aromatic block copolymers and adhesive resins, wherein at least 75% (based on the total amount of resin) of a not too polar resin is chosen, wherein the composition of the adhesive compositions is further optionally identical.