Use Of Heat-Activated Adhesive For Manufacture And A Device So Manufactured

• US 20080191174A1
• Filed: 06/22/2006
• Published: 08/14/2008
• Est. Priority Date: 07/08/2005
• Status: Abandoned Application

• Current Assignee: Cypak AB
• Original Assignee: Cypak AB
• Inventors: Ehrensvard, Jakob, Eriksson, Leif Henrik, Lindman, Vilhelm
• Application Number:
  US11/994,939
• Publication Number:
  US 20080191174A1
• Time in Patent Office: Days
• US Class Current: 252/500
• CPC Class Codes: C09J 9/02 Electrically-conducting adhesives
• CPC Class Codes: H01R 4/04 using electrically conductive adhesives
• CPC Class Codes: H05K 1/0275 Security details, e.g. tampering prevention or detection
• CPC Class Codes: H05K 2201/0129 Thermoplastic polymer, e.g. auto-adhesive layer; Shaping of thermoplastic polymer
• CPC Class Codes: H05K 2201/055 Folded back on itself
• CPC Class Codes: H05K 2203/0759 Forming a polymer layer by liquid coating, e.g. a non-metallic protective coating or an organic bonding layer
• CPC Class Codes: H05K 2203/1105 Heating or thermal processing not related to soldering, firing, curing or laminating, e.g. for shaping the substrate or during finish plating
• CPC Class Codes: H05K 3/245 Reinforcing conductive patterns made by printing techniques or by other techniques for applying conductive pastes, inks or powders; Reinforcing other conductive patterns by such techniques
• CPC Class Codes: H05K 3/323 by applying an anisotropic conductive adhesive layer over an array of pads
• CPC Class Codes: H05K 3/361 Assembling flexible printed circuits with other printed circuits
• CPC Class Codes: H05K 3/4685 Manufacturing of cross-over conductors

Abstract

The invention is based on use of a heat-activated adhesive for manufacturing of intelligent devices comprising printed conductive electronics on a flexible substrate, where the adhesive is an anisotropic electrically conductive adhesive and is applied to the substrate as a thin film which can be used for electrical connections and for providing mechanical stability to the printed conductive electronics.

Claims

1. Use of a heat-activated adhesive for manufacturing of intelligent devices comprising an electronic module and printed conductive electronics, like conductive traces, antennas on a flexible substrate, characterized by that the adhesive is an anisotropic electrically conductive thermoplastic adhesive and is applied to the substrate as a thin film which can be used for adhering components to the substrate, for electrical connections and for providing mechanical stability to the printed conductive traces.

2. Use of a heat-activated adhesive in accordance with claim 1 characterized by that the adhesive comprises an adhesive part and a conductive component.

3. Use of a heat-activated adhesive in accordance with claim 2, characterized by that the adhesive part comprises a solvent- or water based thermoplastic emulsion, having an activation temperature in the interval 80 to 130 C.

4. Use of a heat-activated adhesive in accordance with claim 2, characterized by that the conductive part of the adhesive comprises homogeneously distributed Intrinsically Conductive Polymers, ICPs, of a concentration based on dry weight of 1-20%.

5. Use of a heat-activated adhesive in accordance with claim 2, characterized by that the conductive part of the adhesive comprises homogeneously distributed carbon black particles, of a concentration based on dry weight of 1-20%.

6. Use of a heat-activated adhesive in accordance with claim 2, characterized by that the conductive part of the adhesive comprises homogeneously distributed metal or metal coated particles, of a concentration based on dry weight of 1-20%.

7. Use of a heat-activated adhesive in accordance with claim 1, characterized by that the adhesive is applied to the substrate by a printing method, such as for example screen printing, offset printing, ink jet printing, flexo printing, spraying or bar-coating.

8. Use of a heat-activated adhesive in accordance with claim 1, characterized by that the adhesive film is used for attaching additional parts to the device, such as for example blisters, covering lids, displays, sensors, batteries, buzzers, circuit boards, electronic chips to the device.

9. Use of a heat-activated adhesive in accordance with claim 1, characterized by that the substrate comprises a material such as paper, paperboard, fiber glass, metal, plastics or combinations thereof.

10. Use of a heat-activated adhesive in accordance with claim 9, characterized by that the substrate comprises a release liner, and that the heat-activated adhesive after being printed is dried and formed into a non-tacky free-standing film.

11. Use of a heat-activated adhesive in accordance with claim 1, characterized by that the adhesive film is used for adhering a second flexible substrate to the first substrate.

12. Use of a heat-activated adhesive in accordance with claim 11, characterized by that the second flexible substrate comprises conductive traces and that the adhesive film allows electric contact between the conductive traces on the second flexible substrate and the conductive traces on the first substrate.

13. Use of a heat-activated adhesive in accordance with claim 12, characterized by the intelligent device comprises multiple flexible layers of substrates comprising printed traces on each layer separated by a printed dielectric material and that the printed traces on all layers can be contacted from the first substrate, where an electronic module is mounted.

14. Use of a heat-activated adhesive in accordance with claim 1, characterized by that the adhesive is activated by IR-reflow, heat roll lamination, heated planar press or the like.

15. An intelligent device manufactured by using a heat-activated adhesive in accordance with claim 1.

16. An intelligent device manufactured in accordance with claim 15, characterized by that a resistance between the first and second substrates can be measured in order to determine a quality of the adherence between the substrates.

17. An intelligent device in accordance with claim 16, characterized by that the quality of the adherence is used for detecting tampering with the device.

18. Use of a heat-activated adhesive in accordance with claim 3, characterized by that the conductive part of the adhesive comprises homogeneously distributed Intrinsically Conductive Polymers, ICPs, of a concentration based on dry weight of 1-20%.

19. Use of a heat-activated adhesive in accordance with claim 3, characterized by that the conductive part of the adhesive comprises homogeneously distributed carbon black particles, of a concentration based on dry weight of 1-20%.

20. Use of a heat-activated adhesive in accordance with claim 3, characterized by that the conductive part of the adhesive comprises homogeneously distributed metal or metal coated particles, of a concentration based on dry weight of 1-20%.