Self-adhesive compound and use thereof in an adhesive tape

a self-adhesive compound and adhesive tape technology, which is applied in the direction of adhesive additives, film/foil adhesives, layered products, etc., can solve the problems of inability to achieve requisitely high bonding performance, ozone instability, and inability to uv light and ozone, etc., to achieve high bonding performance, specific viscoelastic behavior, and tear strength

Inactive Publication Date: 2016-03-10
TESA SE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent is about a type of adhesive that is resistant to ozone damage and can be easily detached without leaving any residues. The adhesive is made using special polymers called block copolymers, which are made up of two different blocks. These blocks have a specific microstructure that gives the adhesive its strength and flexibility. The susceptibility to tearing can be adjusted by changing the proportions of the two blocks and the length of the molecules. This makes the adhesive easier to detach without leaving any residues.

Problems solved by technology

Polydienes are intrinsically susceptible to thermooxidative aging and may be damaged by radiation and ozone.
Although high transparency and improved aging stability are possible with the solution outlined, the requisitely high bonding performances, and especially the tear resistance, are not achievable via these formulation approaches.
In this arrangement, the middle layer contributes the major part of the mechanical properties to the product properties, but is unstable toward UV light and ozone on account of its formulation.
A disadvantage of this approach is its multilayerness, which necessitates a multistage production process.
Furthermore, the achievable holding performances are limited due to the adhesive formulation forming the outer layers.
The tension / extension properties and the balance between holding performance and bonding performance, however, are not at a level allowing high-performance adhesive strips to be produced.
Multilayer products or those which include carriers always have the disadvantage either that highly specific machines are required for production, or that a multiplicity of individual process steps have to be carried out.
Both of these are detrimental to the production costs.

Method used

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  • Self-adhesive compound and use thereof in an adhesive tape
  • Self-adhesive compound and use thereof in an adhesive tape
  • Self-adhesive compound and use thereof in an adhesive tape

Examples

Experimental program
Comparison scheme
Effect test

example 1

Comparative

[0158]

wt. %ElastomerKraton D1165 PTpolystyrene-polyisoprene24.00%block copolymerTackifyingDercolyte A115nonhydrogenated47.00%resin 1hydrocarbon resinTackifying- / -resin 2PlasticizingWingtack 10aliphatic hydrocarbon resin3.50%resinFurtherKraton D1102 CSpolystyrene-polybutadiene24.00%constituentsblock copolymerTinuvin 5710.50%Irganfos 1680.50%Irganox 30520.50%

example 2

Comparative

[0159]

wt. %ElastomerKraton D1102 CSpolystyrene-polybutadiene39.00%block copolymerTackifyingDercolyte A115nonhydrogenated45.00%resin 1hydrocarbon resinTackifying- / -resin 2PlasticizingWingtack 10aliphatic hydrocarbon resin4.50%resinFurtherKraton D1118 CSpolystyrene-polybutadiene10.00%constituentsblock copolymerTinuvin 571UV stabilizer0.50%Weston 399antioxidant0.50%Irganox 3052antioxidant0.50%

example 3

Inventive

[0160]

wt. %ElastomerKraton D1102 CSpolystyrene-polybutadiene38.00%block copolymerTackifyingSukorez SU110fully hydrogenated23.50%resin 1hydrocarbon resinTackifyingSukorez SU100fully hydrogenated23.50%resin 2hydrocarbon resinPlasticizingWingtack 10aliphatic hydrocarbon resin3.50%resinFurtherKraton D1118 CSpolystyrene-polybutadiene10.00%constituentsblock copolymerTinuvin 571UV stabilizer0.50%Tinuvin 765antioxidant0.50%Irganox 3052antioxidant0.50%

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Abstract

A self-adhesive compound comprising a) at least one elastomer, at least one type of polybutadiene block copolymer being used as an elastomer, b) at least one partially hydrogenated hydrocarbon resin having a softening temperature of at least 90° C., c) at least one additional hydrocarbon resin, a terpene phenol resin and / or a colophonium resin having a softening temperature of at least 90° C., d) a soft resin, and e) additional additives as applicable.

Description

[0001]This is a 371 of PCT / EP2014 / 056664 filed 3 Apr. 2014, which claims foreign priority benefit under 35 U.S.C. 119 of German Patent Application 10 2013 206 624.4 filed Apr. 15, 2013, the entire contents of which are incorporated herein by reference.[0002]The invention relates to a pressure-sensitive adhesive and also to the use thereof in a pressure-sensitive adhesive strip comprising at least one layer, which is redetachable without residue or destruction by extensive stretching substantially in the bond plane.BACKGROUND OF THE INVENTION[0003]Pressure-sensitive adhesives (PSAs) are adhesives which permit a durable join to the substrate even under relatively weak applied pressure and which after use can be detached from the substrate again substantially without residue. At room temperature, PSAs have a permanently pressure-sensitively adhesive effect, hence having a sufficiently low viscosity and a high initial tack, so that they wet the surface of the particular bonding base eve...

Claims

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Application Information

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IPC IPC(8): B32B7/12C09J153/02C08K5/105C08K5/3435C08K5/3475
CPCC09J153/02C08K5/3475C09J2453/003C08K5/105B32B7/12C08K5/3435C09J11/06C09J7/387C08L53/02C08L57/02
InventorSCHMITZ-STAPELA, DANIELKRAWINKEL, THORSTENDOLLASE, THILOPETERSEN, ANIKASTRIBERNY, TANJAWESTPHAL, ANDREAS
OwnerTESA SE