Flexible heated planar element

Patent metadata

Field	Value
Publication number	US-9560697-B2
Application number	US-50746609-A
Country	US
Kind code	B2
Filing date	Jul 22, 2009
Priority date	Jul 24, 2008
Publication date	Jan 31, 2017
Grant date	Jan 31, 2017

Abstract

A double-sidedly self-adhesive planar element which is intrinsically heatable in a self-regulating way and at the same time has a particularly high flexibility. The planar element has a layer sequence of a posistor heating layer, a contacting layer and an adhesive layer, the contacting layer being a two-dimensional perforate contacting element which within the planar element is therefore present as a contacting element which has not been applied to a backing. Also disclosed is an adhesively bonded assembly of a bonding substrate and a planar element of the aforesaid kind, a method of producing a planar element of the aforesaid kind, and a method of using a planar element of the aforesaid kind for heating an adhesively bonded assembly.

First claim

The invention claimed is:

1. A planar element having a first self-adhesive side face and a second adhesive side face, the planar element featuring a layer sequence comprising a heating layer, a contacting layer, and an adhesive layer;
wherein the planar element is backing-free and flexible;
wherein the heating layer is in contact, and in electrically conducting communication, with a first side face of the contacting layer;
wherein the adhesive layer is in contact with a second side face of the contacting layer;
wherein the heating layer is composed of an intrinsically heatable first self-adhesive designed as a posistor which heats up when an electric current is passed through;
wherein the heating layer has a thickness of 20-200 μm;
wherein the adhesive layer is composed of a second self-adhesive;
wherein the contacting layer is an at least substantially two-dimensionally extended perforate contacting element;
wherein the contacting layer is the only contacting layer in the planar element;
wherein the contacting layer has a thickness of less than 20 μm;
wherein the contacting layer consists of a conductive varnish, conductive ink, or conductive printing ink.

2. The planar element according to claim 1 , wherein the perforate contacting element has reliefs whose principal extent runs at least substantially in one spatial direction.

3. The planar element according to claim 1 , wherein the perforate contacting element has a branched comb structure or finger structure.

4. The planar element according to claim 1 , wherein all sub-regions of the perforate contacting element are in electrically conducting connection with one another.

5. The planar element according to claim 1 , wherein the perforation contacting element has at least two sub-regions which are not in electrically conducting connection with one another via the perforate contacting element.

6. The planar element according to claim 1 , wherein the first self-adhesive comprises at least one electrically conductive filler.

7. The planar element according to claim 6 , wherein the electrically conductive filler is selected from the group consisting of graphite, carbon nanoparticles, and carbon black.

8. The planar element according to claim 6 , wherein the first self-adhesive features partially crystalline polymers.

9. The planar element according to claim 1 , wherein the first self-adhesive and/or the second self-adhesive is a pressure-sensitive adhesive.

10. The planar element according to claim 1 , wherein the first self-adhesive and the second self-adhesive are pressure-sensitive adhesives that undergo a permanent adhesive bond at room temperature with a substrate to which the planar element is adhered.

11. The planar element according to claim 1 , wherein the first self-adhesive and/or the second self-adhesive is a hot melt adhesive.

12. The planar element according to claim 1 , wherein the composition of first self-adhesive is identical to the composition of the second self-adhesive.

13. The planar element according to claim 1 , wherein the composition of first self-adhesive is different to the composition of the second self-adhesive.

14. The planar element according to claim 1 , wherein the planar element has a third self-adhesive on the side face of the heating layer that faces away from the perforate contacting element.

15. The planar element according to claim 1 , which consists of four layers in the following sequence:
heating layer-contacting layer-adhesive layer.

16. The planar element according to claim 1 , which consists of four layers in the following sequence:
additional adhesive layer-heating layer-contacting layer-adhesive layer;
wherein the additional adhesive layer is composed of a third self-adhesive that may be the same as or different from the second self-adhesive of the adhesive layer.

17. An adhesively bonded assembly comprising a bonding substrate adhered to a planar element according to claim 1 .

18. An adhesively bonded assembly comprising a bonding substrate adhered to a planar element according to claim 15 .

19. An adhesively bonded assembly comprising a bonding substrate adhered to a planar element according to claim 16 .

20. A method of producing a planar element according to claim 1 , comprising the steps of:
forming a first adhesive stratum,
applying the perforate contacting element directly to the surface of the first adhesive stratum, and
applying a second adhesive stratum to the surface of the perforate contacting element.

21. A method of heating an adhesively bonded assembly according to claim 17 , said method comprising passing electric current through said planar element to cause said planar element to heat.

22. A method for adhesive bonding on the surface of a human or animal body, said method comprising adhering to the surface of the human or animal body a planar element according to claim 1 , wherein the planar element comprises at least one active substance which can be released by heat or whose release is supported by heat.

23. A flexible planar element in backing-free form, the planar element consisting of either three or four layers, the three layers having the layer structure A, and the four layers having the layer structure B, wherein layer structure A has the layer sequence: heating layer-contacting layer-adhesive layer, and layer structure B has the layer sequence: additional adhesive layer-heating layer-contacting layer-adhesive layer, wherein the heating layer is in electrically conducting communication with the contacting layer, wherein the heating layer is composed of an intrinsically heatable first self-adhesive designed as a posistor that heats up when an electric current passes through it, wherein the heating layer has a thickness of 20-200 μm, wherein the contacting layer is an at least substantially two-dimensionally extended perforate contacting element, wherein the contacting layer is the only contacting layer in the planar element, wherein the contacting layer has a thickness of less than 20 μm, wherein the contacting layer consists of a conductive varnish, conductive ink, or conductive printing ink, wherein the adhesive layer is composed of a second self-adhesive, and wherein the additional adhesive layer is composed of a third self-adhesive that may be identical to or different from the second self-adhesive.

Assignees

• Junghans Monika
• Dietz Bernd
• Domann Frank
• Dominikat Udo
• KEITE-TELGENBüSCHER KLAUS
• Ellringmann Ute
• Tesa Se

Inventors

• Junghans Monika
• Dietz Bernd
• Domann Frank
• Dominikat Udo
• KEITE-TELGENBüSCHER KLAUS
• Ellringmann Ute

Classifications

• A61K9/703

  characterised by shape or structure; Details concerning release liner or backing; Refillable patches; User-activated patches · CPC title

• Y10T428/2804

  Next to metal · CPC title

• H05B3/34 Primary

  flexible, e.g. heating nets or webs · CPC title

• Y10T428/265

  1 mil or less · CPC title

• B32B2250/03

  3 layers · CPC title