Pressure-sensitive adhesive tape with functionalized adhesive and use thereof

• US 20100092768A1
• Filed: 10/13/2008
• Published: 04/15/2010
• Est. Priority Date: 10/13/2008
• Status: Abandoned Application

• Current Assignee: Tesa SE (Maxingvest AG)
• Original Assignee: Tesa AG (Maxingvest AG)
• Inventors: Kampers, Maren, Neubert, Ingo
• Application Number:
  US12/250,058
• Publication Number:
  US 20100092768A1
• Time in Patent Office: Days
• US Class Current: 428/337
• CPC Class Codes: B32B 27/10 of paper or cardboard
• CPC Class Codes: B32B 27/36 comprising polyesters
• CPC Class Codes: B32B 29/06 specially treated, e.g. surfaced, parchmentised
• CPC Class Codes: B32B 7/06 permitting easy separation
• CPC Class Codes: B32B 7/12 using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: C08F 220/06 Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
• CPC Class Codes: C08F 220/1806 C6-(meth)acrylate, e.g. (cyclo)hexyl (meth)acrylate or phenyl (meth)acrylate
• CPC Class Codes: C09J 133/10 Homopolymers or copolymers of methacrylic acid esters
• CPC Class Codes: C09J 7/385 Acrylic polymers
• CPC Class Codes: Y10T 428/266 of base or substrate
• CPC Class Codes: Y10T 428/28 Web or sheet containing structurally defined element or component and having an adhesive outermost layer
• CPC Class Codes: Y10T 428/2848 Three or more layers
• CPC Class Codes: Y10T 428/2852 Adhesive compositions
• CPC Class Codes: Y10T 428/2878 including addition polymer from unsaturated monomer

Abstract

Pressure-sensitive adhesive tape having a backing material coated on one or both sides with a pressure-sensitive adhesive, wherein at least one surface of pressure-sensitive adhesive is functionalized by an additional surfactant-containing coating, the functionalization of the surface of pressure-sensitive adhesive being retained even after a storage time of 6 weeks at 40° C., and the bond strength to steel of the functionalized pressure-sensitive adhesive being at least 0.5 N/cm.

Claims

1. Pressure-sensitive adhesive tape comprising a backing material coated on one or both sides with a pressure-sensitive adhesive, wherein at least one surface of pressure-sensitive adhesive is functionalized by an additional surfactant-containing coating, the functionalization of the surface of pressure-sensitive adhesive being retained even after a storage time of 6 weeks at 40°

C., and the bond strength to steel of the functionalized pressure-sensitive adhesive being at least 0.5 N/cm.

2. Pressure-sensitive adhesive tape according to claim 1, wherein the pressure-sensitive adhesive is composed of one or more copolymers, with acrylate monomers forming the principal constituent.

3. Pressure-sensitive adhesive tape according to claim 1, wherein the coating for functionalizing the pressure-sensitive adhesive comprises at least one ionic surfactant.

4. Pressure-sensitive adhesive tape according to claim 1, wherein the coating for functionalizing the pressure-sensitive adhesive is composed, after drying, exclusively of a salt of a sulfosuccinic ester without further adjuvants.

5. Pressure-sensitive adhesive tape according to claim 1, which comprises a concentration of the surfactant or surfactants in the surfactant-containing coating for functionalizing the pressure-sensitive adhesive of not more than 30% by weight.

6. Pressure-sensitive adhesive tape according to claim 1, wherein the coating comprises a binder.

7. Pressure-sensitive adhesive tape according to claim 1, wherein the surfactant-containing coating is a dried solution, in a suitable solvent or in water, applied partially or over the full area to the pressure-sensitive adhesive.

8. Pressure-sensitive adhesive tape according to claim 1, wherein the pressure-sensitive adhesive functionalized by the surfactant-containing coating possesses the following properties:

a surface tension of at least 60 mN/m,

a contact angle with water of less than 350 and/or

a bond strength to steel of at least 1.0 N/cm.

9. Pressure-sensitive adhesive tape according to claim 1, wherein the functional properties of the pressure-sensitive adhesive functionalized by the surfactant-containing coating, which are characterized by the surface tension and the contact angle with water, differ by not more than 25%, after storage at 40°

C. for 6 weeks from the original value (fresh value).

10. Pressure-sensitive adhesive tape according to claim 1, wherein the backing material is composed of a polyester film.

11. A device selected from the group consisting of diagnostic strips, biosensors, point-of-care devices and microfluidic devices by means of which biological fluids are analyzed, said device comprising a pressure-sensitive adhesive tape according to claim 1.

12. Process for producing a functionalized pressure-sensitive adhesive tape according to claim 1, comprising applying a coating solution from a solvent or water in which at least one surfactant has been dissolved to a pressure-sensitive adhesive tape, which is composed of a backing material coated on one or both sides with a pressure-sensitive adhesive, and drying the pressure-sensitive adhesive tape with the coating solution, so that, after drying, a surfactant-containing coating is obtained on the surface of the pressure-sensitive adhesive.

13. Process according to claim 12, where the coating solution comprises at least one anionic surfactant.