Conductive masking laminate

• US 4,988,550 A
• Filed: 07/28/1989
• Issued: 01/29/1991
• Est. Priority Date: 07/28/1989
• Status: Expired due to Term

• Current Assignee: Parker Intangibles LLC (Parker-Hannifin Corporation)
• Original Assignee: Chomerics, Inc. (Parker-Hannifin Corporation)
• Inventors: Keyser, Paul, Hubbard, John D., Jones, Peter
• Primary Examiner(s): Thomas, Alexander S.
• Application Number:
  US07/386,393
• Time in Patent Office: 550 Days
• Field of Search: 428/40, 428/43, 428/42, 428/77, 428/194, 428/202, 428/173, 428/354, 428/356, 428/906, 118/505
• US Class Current: 428/41.1
• CPC Class Codes: B05B 12/24 made at least partly of flexible material, e.g. sheets of paper or fabric
• CPC Class Codes: B32B 7/06 permitting easy separation
• CPC Class Codes: H05K 9/0039 Galvanic coupling of ground layer on printed circuit board [PCB] to conductive casing printed shielding conductors, ground planes or power planes for reduction of cross-talk or noise in printed circuits H05K1/0218
• CPC Class Codes: Y10T 428/1443 Aluminum
• CPC Class Codes: Y10T 428/15 Sheet, web, or layer weakened to permit separation through thickness
• CPC Class Codes: Y10T 428/2462 with partial filling of valleys on outer surface
• CPC Class Codes: Y10T 428/24793 Comprising discontinuous or differential impregnation or bond
• CPC Class Codes: Y10T 428/2486 with outer strippable or release layer
• CPC Class Codes: Y10T 428/2848 Three or more layers
• CPC Class Codes: Y10T 428/2857 including metal or compound thereof or natural rubber

Abstract

A masking tape for EMI shielding applications comprising an adhesive layer, a metal foil layer adhered to the top of the adhesive layer, two or more adhesive strips running parallel to the edges of the tape and extending the length of the foil along the strips are preferably inset from the outer edges of the foil so as to form a stepped or notch-like configuration. A mask layer is attached to the top of the strips. The mask alone or the mask and strips are designed to be removed after use. The tape is applied to a substrate such as a computer cabinet, the cabinet is then sprayed with a paint or finish coat and the mask is removed to reveal a conductive metal foil surface to which a conductive EMI shield can be mounted.

Claims

1. A masking laminate comprising an adhesive layer, a metal foil layer adhered to an upper surface of the adhesive layer, a plurality of adhesive strips formed along a length of the metal foil layer on a side opposite to the adhesive layer, the adhesive strips running parallel to an outer edge of the metal foil, the adhesive strips being spaced apart from one another so as to form one or more adhesive free areas on a surface of the foil layer, at least one of the adhesive free areas being centrally located on the foil layer and at least one releasable mask layer adhered to an upper surface of the adhesive strips.

2. The laminate of claim 1 wherein the adhesive layer is a pressure sensitive adhesive;

the metal foil layer is selected from the group consisting of conductive metal foils, conductive metal alloys and conductive plated metal foils.

3. The laminate of claim 1 wherein the adhesive layer is electrically conductive.

4. The laminate of claim 3 wherein the conductive metal foil is selected from the group consisting of silver, gold, platinum, palladium, copper, nickel, tin, zinc, aluminum, cobalt, iron, steel and stainless steel.

5. The laminate of claim 3 wherein the conductive metal alloy foil is selected from the group consisting of silver, gold, platinum, palladium, copper, nickel, tin, zinc, aluminum, cobalt, iron, steel and stainless steel alloys.

6. The laminate of claim 3 wherein the plated metal foils are selected from the group consisting of noble metal plated metal foils, and non noble metal plated metal foils.

7. The laminate of claim 1 wherein the metal foil layer has a series of projections which extend through the adhesive layer.

8. The laminate of claim 7 wherein the adhesive layer is electrically conductive.

9. The laminate of claim 1 wherein the adhesive layer is an electrically conductive pressure sensitive adhesive.

10. The laminate of claim 1 further comprising a release layer attached to an outer surface of the adhesive layer.

11. The laminate of claim 1 wherein the plurality of adhesive strips is two.

12. The laminate of claim 1 wherein the mask layer has a width equal to or less than the width of the foil layer.

13. The laminate of claim 1 wherein the mask layer has a width substantially equal to the width of the foil layer and the mask layer has a series of perforations formed parallel to the width of the foil but inward from the width of the foil.

14. The laminate of claim 1 wherein the width of the mask layer and the distance from an outer edge of the outermost adhesive strip to an outer edge of an opposite outer most adhesive strip are equal and the width of the mask and the distance between the outer most strips is less than the width of the metal foil layer.

15. A conductive tape comprising a metal foil layer having a length greater than its width, the foil layer having a bottom side and a top side, a conductive adhesive layer being formed on the bottom side, a plurality of adhesive strips formed on the top side of the foil layer and running parallel to the length of the foil layer, the adhesive strips being spaced apart from one another so as to form one or more adhesive free areas on the top side of the foil layer, and one or more releasable mask layers adhered to an upper surface of the adhesive strips.

16. The tape of claim 15 wherein the metal foil is selected from the group consisting of conductive metal foils, conductive metal alloys and plated conductive metal foils.

17. The tape of claim 15 wherein the metal foil is selected from the group consisting of copper, silver, gold, platinum, palladium, nickel, iron, iron alloys, tin, zinc, aluminum, steel, stainless steel, silver coated tin, silver coated copper, silver coated aluminum, silver coated zinc, nickel coated copper, nickel coated tin, nickel coated zinc, nickel coated iron and nickel coated iron alloy.

18. The tape of claim 15 wherein the conductive adhesive is a pressure sensitive conductive adhesive.

19. The tape of claim 15 further comprising a release layer bonded to an outer surface of the conductive adhesive layer.

20. The tape of claim 15 wherein the plurality of adhesive strips is two, a first strip running along a first edge of the top side of the foil and a second strip running along a second edge of the top side of the foil opposite and parallel to the first edge so as to form one adhesive free area in a center portion of the foil.

21. The tape of claim 15 wherein the releasable mask layer has a width substantially equal to the width of the foil layer and has a series of perforations arranged to be in juxtaposition with at least an inner edge of the plurality of adhesive strips.

22. The tape of claim 15 wherein the plurality adhesive strips are indented from the width of the foil layer so as to form a step or notch like configuration along the width of the foil.

23. The tape of claim 15 wherein the releasable mask has a width less than the width of the metal foil layer.

24. The tape of claim 15 wherein the width of the releasable mask layer corresponds to the distance between the outer edges of the outer most adhesive strips.

25. A conductive masking strip comprising an electrically conductive metal foil layer, a first side of the foil having a coating of a pressure sensitive electrically conductive adhesive, a second side of the foil, opposite the first side of the foil, has at least two thin adhesive strips running along a length of the foil layer, the strips being arranged so as to be spaced from either edge of the second surface and spaced apart from each other so as to form at least one centrally located adhesive free area on the foil layer, a removable mask layer having a width corresponding to the distance between the strips and being adhered to the two or more adhesive strips.

26. A masking laminate comprising an electrically conductive metal foil layer, the foil layer having a length substantially greater than its width, the foil layer having a series of projections extending outwardly from one surface, an adhesive layer coated onto the surface of the foil layer containing the projections, the adhesive layer having a thickness substantially equal to the height of the projections, at least two adhesive strips coated onto a surface of the foil layer opposite the surface containing the projections, the strips being spaced apart from each and running essential parallel to the width of the foil layer so as to form at least one adhesive free area on the foil surface, a removable mask layer having a width equal to or less than the width of the foil layer and being adhered to an upper surface of the two or more adhesive strips.

27. The masking laminate of claim 26 wherein the metal foil layer is selected from the group consisting of silver foil, gold foil, platinum foil, palladium foil, copper foil, aluminum foil, tin foil, zinc foil, cobalt foil, nickel foil, iron foil, stainless steel foil, silver plated copper foil, silver plated aluminum foil, silver plated nickel foil and tin plated copper foil, the adhesive layer is selected from the group consisting of non electrically conductive pressure sensitive adhesives and electrically conductive pressure sensitive adhesives and the mask layer is selected from the group consisting of polymeric films, coated paper, woven and non woven fabrics and metal foils.

28. The masking laminate of claim 26 wherein the number of adhesive strips is two, first strip running along a first outer edge of the foil layer and a second strip running along a second outer edge of the foil layer and the first and second adhesive strips being parallel to each other and the outer edges of the foil layer.

29. The masking laminate of claim 28 wherein the first and second adhesive strips are inward of the outer edges of the foil layer so as to form a stepped or notched configuration.

30. The masking laminate of claim 29 wherein the width of the mask layer is equal to the distance from an outer edge of the first adhesive strip to an outer edge of the second adhesive strip.

31. The masking laminate of claim 26 wherein the adhesive strips and the mask layer are removable from the metal foil layer.

32. The masking laminate of claim 26 wherein a portion of the mask layer having a width substantially equal to or greater than the width of the adhesive free area is removable.

33. A conductive strip comprising an electrically conductive metal foil layer, a first side of the foil having a first adhesive layer covering the first side and a means for providing electrical conductivity between the foil layer and a surface to which it is bonded, a second side of the foil layer, opposite the first side of the foil layer having a means for forming an adhesive free area centrally located on the second side of foil layer, a second adhesive layer covering the means for forming the adhesive free area and a portion of the second side of the foil beyond the centrally located adhesive free area, the second adhesive layer being arranged so as to be spaced inwardly from either edge of the second side of the foil layer, and a removable mask layer adhered to the second adhesive layer on the second side and having a width greater than the centrally located adhesive free area, but equal to or less than that of the second adhesive layer the second side of the foil layer.

34. The conductive strip of claim 33 wherein the means for providing electrically conductivity between the foil and the surface to which it is bonded is selected from the group consisting of a series of projections extending outwardly from the first side of the foil layer and being substantially the same height as the thickness of the first adhesive layer, a conductively filled adhesive or both;

and wherein the means for forming an adhesive free centrally located area on the second surface is a plastic film.

35. A conductive masking strip comprising a metal foil layer having a first and second surfaces opposite each other, the first surface having a conductive adhesive layer coated on it so as to bond the foil to a substrate and provide conductivity between the foil and the substrate, the second surface having a centrally located, adhesive free area covered by a plastic film, an adhesive layer covering the plastic film and a portion of the second surface beyond the plastic film, but less than the entire width of the second surface, a mask layer adhered to the adhesive layer of the second surface and substantially covering the adhesive layer of the second surface.