Electrically conductive patterns

• US 5,238,702 A
• Filed: 04/06/1992
• Issued: 08/24/1993
• Est. Priority Date: 10/27/1988
• Status: Expired due to Fees

• Current Assignee: Bayer AG
• Original Assignee: Bayer AG
• Inventors: Giesecke, Henning, Bonack Armin, Wilde, Horst D.
• Primary Examiner(s): Beck, Shrive
• Assistant Examiner(s): Utech, Benjamin L.
• Application Number:
  US07/866,088
• Time in Patent Office: 505 Days
• Field of Search: 427/98, 427/443.1, 427/123, 427/271, 427/299, 427/372.2
• US Class Current: 427/78
• CPC Class Codes: H05K 1/0393 Flexible materials H05K1/038 takes precedence; specific organic compositions are classified in H05K1/0313 and subgroups
• CPC Class Codes: H05K 3/181 by electroless plating adhesives therefor H05K3/387
• CPC Class Codes: H05K 3/4092 Integral conductive tabs, i.e. conductive parts partly detached from the substrate

Abstract

Electrically conductive patterns, printed-circuit boards for example, with integrated free-standing connection and plugging sections are obtained by the known (semi-)additive methods wherein both the circuit paths and the connection and plugging sections are metallized in one operation with the metal coating in those sections being deposited with such a low adhesion that it can easily be loosened from the surface of the substrate without damage.

Claims

1. A method for manufacturing single-layer or multilayer electrically conductive patterns, having integrated free-standing connection and plugging sections, on bases wherein said integrated free-standing connection and plugging sections can be easily separated from said bases without damage, which comprises applying formulations that contain organometallic activators to the surfaces of base materials followed by metallization by electroless deposition to form the electrically conductive patterns with integrated free-standing connection and plugging sections, wherein the organometallic activator-containing formulations that are applied to those portions of the base material surfaces upon which the integrated free-standing connection and plugging sections are to be formed are formulations which, when dried, have such a low adhesion for the connection and plugging sections to be formed that said connection and plugging sections, once formed, can be easily separated therefrom without damage.

2. The method according to claim 1, wherein the base employed for the connection and plugging sections differs from the base of the conductive pattern and exhibits a lower adhesion to metal coatings.

3. A method for manufacturing single-layer or multilayer electrically conductive patterns having integrated free-standing connection and plugging sections, on bases wherein said integrated free-standing connection and plugging sections have a lesser adhesion strength than the remainder of the conductive pattern and can be loosened from said bases by heating to 60°

C. to 300°

C. which comprises applying formulations that contain organometallic activators to the surfaces of bases, followed by metallization by electroless deposition to form electrically conductive patterns with integrated free-standing connection and plugging sections, wherein the activator formulations applied to those portions of the base material surfaces upon which the integrated free-standing connection and plugging sections are to be formed contain a thermoplastic binder which allows the connection and plugging sections, once formed, to loosen when heated to 60°

C. to 300°

C. while the remainder of the electrically conductive patterns continue to adhere.

4. The method according to claim 3, wherein the adhesion in the connection and plugging sections is decreased by preliminary physical or chemical treatments.

5. The method according to claim 3, wherein the activator formulation applied to those portions of the base material surfaces upon which the integrated free-standing connection and plugging sections are to be formed allows the metal coating to loosen when heated to 100°

to 250°

C.

6. The method according to claim 3, wherein the formulation applied to those portions of the base material surfaces upon which the integrated free-standing connection and plugging sections are to be formed contains a polyurethane binder and a disperse silicic acid as filler.

7. A method for manufacturing single-layer or multilayer electrically conductive patterns, having integrated free-standing connection and plugging sections, on bases wherein said integrated free-standing connection and plugging sections can be easily separated from said bases while the remainder of said conductive patterns remain on the bases without damage and without disconnecting said connecting and plugging sections from the remainder of said conductive patterns, which comprises applying formulations that contain organometallic activators to the surfaces of base materials followed by metallization by electroless deposition to form the electrically conductive patterns with integrated free-standing connection and plugging sections, wherein the organometallic activator-containing formulations that are applied to those portions of the base material surfaces upon which the integrated free-standing connection and plugging sections are to be formed are different than the formulations applied to those portions of the base material surfaces upon which the remainder of the electrically conductive patterns are to be formed, the formulations being applied to the portions of the base material surfaces upon which the integrated free-standing connection and plugging sections are to be formed being formulations which, when dried, have such a low adhesion for the connection and plugging sections to be formed that said connection and plugging sections, once formed, can be easily separated therefrom without damage while the formulations that are applied to the portions of the base material surfaces upon which the remainder of the electrically conductive patterns are to be formed are formulations which, when dried, have such a high adhesion for the remainder of the electrically conductive patterns that said remainder of the electrically conductive patterns become permanently affixed to said bases, and remain affixed to said bases when said connection and plugging sections are separated from said bases, and separating said plugging and connection sections from said bases without separating said plugging and connection sections from the remainder of said electrically conductive patterns.

8. The method according to claim 7, wherein the formulations contain a polyurethane binder and a disperse silicic acid as filler.

9. The method according to claim 7, wherein the adhesion in the connection and plugging sections is less than 15 N/inch.