Pressure-sensitive adhesive strip

Patent metadata

Field	Value
Publication number	US-10669455-B2
Application number	US-201715674765-A
Country	US
Kind code	B2
Filing date	Aug 11, 2017
Priority date	Dec 9, 2016
Publication date	Jun 2, 2020
Grant date	Jun 2, 2020

Abstract

The invention relates to a pressure-sensitive adhesive strip composed of at least three layers, comprising
an inner layer F composed of a non-extensible film carrier, a layer SK 1 composed of a self-adhesive composition arranged on one of the surfaces of the film carrier layer F and based on a vinylaromatic block copolymer composition foamed with microballoons, a layer SK 2 composed of a self-adhesive composition arranged on the opposite surface of the film carrier layer F from the layer SK 1 and based on a vinylaromatic block copolymer composition foamed with microballoons,
where the mean diameter of the voids formed by the microballoons in the self-adhesive composition layers SK 1 and SK 2 is independently 20 to 60 μm.

First claim

The invention claimed is:

1. A pressure-sensitive adhesive strip comprising:
inner layer F comprising a non-extensible film carrier, a first surface, and a second surface;
layer SK 1 comprising a first self-adhesive composition disposed on the first surface; and
layer SK 2 comprising a second self-adhesive composition disposed on the second surface,

wherein:
the first self-adhesive composition is based on a first vinylaromatic block copolymer composition foamed with a first plurality of microballoons;
the second self-adhesive composition is based on a second vinylaromatic block copolymer composition foamed with a second plurality of microballoons;
the first plurality of microballoons forms a first plurality of voids having a first mean diameter of 20 to 60 μm;
the second plurality of microballoons forms a second plurality of voids having a second mean diameter of 20 to 60 μm; and
inner layer F has a tensile strength in a longitudinal direction of greater than 100 N/mm 2 and/or a tensile strength in a transverse direction of greater than 100 N/mm 2 .

2. The pressure-sensitive adhesive strip as claimed in claim 1 , wherein the first vinylaromatic block copolymer composition and the second vinylaromatic block copolymer composition are chemically identical.

3. The pressure-sensitive adhesive strip as claimed in claim 1 , wherein layer SK 1 and layer SK 2 have the same thickness and/or have the same density.

4. The pressure-sensitive adhesive strip as claimed in claim 1 , wherein:
layer SK 1 comprises 20 to 75% by weight of a first at least one vinylaromatic block copolymer based on the total weight of layer SK 1 ; and
layer SK 2 comprises 20 to 75% by weight of a second at least one vinylaromatic block copolymer based on the total weight of layer SK 2 .

5. The pressure-sensitive adhesive strip as claimed in claim 1 , wherein:
layer SK 1 is formed from a first at least one vinylaromatic block copolymer and a first tackifying resin; and/or
layer SK 2 is formed from a second at least one vinylaromatic block copolymer and a second tackifying resin.

6. The pressure-sensitive adhesive strip as claimed in claim 5 , wherein:
layer SK 1 comprises 20 to 60% by weight of the first tackifying resin based on the total weight of layer SK 1 ; and/or
layer SK 2 comprises 20 to 60% by weight of the second tackifying resin based on the total weight of layer SK 2 .

7. The pressure-sensitive adhesive strip as claimed in claim 1 , wherein:
the first plurality of microballoons is present at up to 12% by weight based on the total weight of layer SK 1 ; and/or
the second plurality of microballoons is present at up to 12% by weight based on the total weight of layer SK 2 .

8. The pressure-sensitive adhesive strip as claimed in claim 1 , wherein:
the first mean diameter is 20 to 50 μm; and/or
the second mean diameter is 20 to 50 μm.

9. The pressure-sensitive adhesive strip as claimed in claim 1 , wherein layer SK 1 consists of:
a first at least one vinylaromatic block copolymer present at 20 to 75% by weight based on the total weight of layer SK 1 ;
a first at least one tackifying resin present at 24.6 to 60% by weight based on the total weight of layer SK 1 ;
the first plurality of microballoons is present at 0.2 to 10% by weight based on the total weight of layer SK 1 ; and
a first at least one additive present at 0.2 to 10% by weight based on the total weight of layer SK 1 ,

and/or layer SK 2 consists of:
a second at least one vinylaromatic block copolymer present at 20 to 75% by weight based on the total weight of layer SK 2 ;
a second at least one tackifying resin present at 24.6 to 60% by weight based on the total weight of layer SK 2 ;
the second plurality of microballoons is present at 0.2 to 10% by weight based on the total weight of layer SK 2 ; and
a second at least one additive present at 0.2 to 10% by weight based on the total weight of layer SK 2 .

10. The pressure-sensitive adhesive strip as claimed in claim 1 , wherein layer SK 1 consists of:
a first at least one vinylaromatic block copolymer present at 35 to 65% by weight based on the total weight of layer SK 1 ;
a first tackifying resin present at 34.6 to 45% by weight based on the total weight of layer SK 1 ;
the first plurality of microballoon is present at 0.2 to 10% by weight based on the total weight of layer SK 1 ; and
a first at least one additive present at 0.2 to 10% by weight based on the total weight of layer SK 1 ,

and/or layer SK 2 consists of:
a second at least one vinylaromatic block copolymer present at 35 to 65% by weight based on the total weight of layer SK 2 ;
a second tackifying resin present at 34.6 to 45% by weight based on the total weight of layer SK 2 ;
the second plurality of microballoons is present at 0.2 to 10% by weight based on the total weight of layer SK 2 ; and
a second at least one additive present at 0.2 to 10% by weight based on the total weight of layer SK 2 .

11. The pressure-sensitive adhesive strip as claimed in claim 1 , wherein layer SK 1 consists of:
a first at least one vinylaromatic block copolymer present at 30 to 75% by weight based on the total weight of layer SK 1 ;
a first at least one tackifying resin present at 24.8 to 60% by weight based on the total weight of layer SK 1 ; and
the first plurality of microballoons is present at 0.2 to 10% by weight based on the total weight of layer SK 1 ,

and/or layer SK 2 consists of:
a second at least one vinylaromatic block copolymer is present at 30 to 75% by weight based on the total weight of layer SK 2 ;
a second at least one tackifying resin present at 24.8 to 60% based on the total weight by weight of layer SK 2 ; and
the second plurality of microballoons is present at 0.2 to 10% by weight based on the total weight of layer SK 2 .

12. The pressure-sensitive adhesive strip as claimed in claim 1 , wherein:
layer SK 1 has an absolute density of 400 to 990 kg/m 3 and/or a relative density of 0.35 to 0.99; and/or
layer SK 2 has an absolute density of 400 to 990 kg/m 3 and/or a relative density of 0.35 to 0.99.

13. The pressure-sensitive adhesive strip as claimed in claim 1 , wherein:
layer SK 1 has a thickness between 20 and 200 μm; and/or
layer SK 2 has a thickness between 20 and 200 μm.

14. The pressure-sensitive adhesive strip as claimed in claim 1 , wherein:
the first surface has been physically and/or chemically pretreated; and/or
the second surface has been physically and/or chemically pretreated.

15. The pressure-sensitive adhesive strip as claimed in claim 14 , wherein:
the first surface has been etched, treated with a corona, and/or treated with a primer; and/or
the second surface has been etched, treated with a corona, and/or treated with a primer.

16. The pressure-sensitive adhesive strip as claimed in claim 1 , wherein inner layer F comprises at least one polyester.

17. The pressure-sensitive adhesive strip as claimed in claim 1 , wherein inner layer F has a thickness between 5 and 125 μm.

18. The pressure-sensitive adhesive strip as claimed in claim 1 , wherein inner layer F has an elongation at break of less than 300%.

19. The pressure-sensitive adhesive strip as claimed in claim 1 , wherein the pressure-sensitive adhesive strip has a thickness of 45 to 4000 μm.

20. The pressure-sensitive adhesive strip as claimed in claim 1 , wherein:
the first plurality of microballoons is present at 1.5 to 2.5% by weight based on
the total weight

Assignees

• Tesa Se

Inventors

• Blazejewski Anna
• Burmeister Axel
• Lohmann Franciska
• Petersen Anika

Classifications

• C09J2205/102

  Chemistry & Metallurgy · mapped topic

• C09J2453/00

  Presence of block copolymer · CPC title

• C09J7/22

  Plastics; Metallised plastics · CPC title

• C09J11/08 Primary

  Macromolecular additives · CPC title

• C09J153/02 Primary

  Vinyl aromatic monomers and conjugated dienes · CPC title