US5685939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making a Z-axis adhesive and establishing electrical interconnection therewith
Assignee: 3M Innovative Properties Co
•
Filing: 1995-03-10
•
Granted: 1997-11-11
•
Expires: 2015-03-10
Abstract
Abstract A Z-axis adhesive is produced by dispersing electrically-conductive particles in an organic binder and then imagewise exposing the material to electromagnetic radiation, preferably from a laser or a flash lamp, under conditions sufficient to transfer the particles from the binder to a receptor in a patterned fashion such that the resulting adhesive is a Z-axis conductor in the patterned areas. The patterned adhesive can then be used to establish electrical interconnection between facing electrodes of a number of different structures including semiconductor chips and a flexible printed circuit board.
Inventors
- 👤 Martin B. Wolk
- 👤 Thomas A. Isberg
- 👤 Michael A. Kropp
- 👤 William V. Dower
- 👤 Joel A. Gerber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:22
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/30; H05K3/32; H05K3/321; H05K3/323; H10; H10W; H10W72/00; H10W72/071; H10W20/00; H10W20/40; H10W20/41; H10W20/44; H10W20/4473; H10W70/00; H10W70/60; H10W70/62; H10W70/66; H10W70/666; H05K2203/00; H05K2203/03; H05K2203/0338; H05K2203/05; H05K2203/0502; H05K2203/0528; H05K2203/10; H05K2203/107; H05K3/10; H05K3/102; H10W72/073; H10W72/07331; H10W72/30; H10W72/321; H10W72/325; H10W72/351; H10W72/352; H10W72/353; H10W72/354
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
101 words
A process for establishing electrical interconnection between two electrode-containing materials using a patterned Z-axis adhesive comprising the steps of: (a) providing a donor element comprising a substrate having coated thereon a layer comprising electrically-conductive particles dispersed in an organic binder; (b) placing said donor element in intimate contact with an adhesive receptor; (c) imagewise exposing said donor element to electromagnetic radiation under conditions sufficient to transfer said electrically-conductive particles from said donor element to said adhesive receptor in a patterned fashion to form the Z-axis adhesive; and (d) bonding together a first and a second electrode-containing material with the Z-axis adhesive.
Claim 2
Dependent Claim
101 words
A process for establishing electrical interconnection between two electrode-containing materials using a patterned Z-axis adhesive comprising the steps of: (a) providing a donor element comprising a substrate having coated thereon a layer comprising electrically-conductive particles dispersed in an organic binder; (b) placing said donor element in intimate contact with an adhesive receptor; (c) imagewise exposing said donor element to electromagnetic radiation under conditions sufficient to transfer said electrically-conductive particles from said donor element to said adhesive receptor in a patterned fashion to form the Z-axis adhesive; and (d) bonding together a first and a second electrode-containing material with the Z-axis adhesive.
Claim 3
Dependent Claim
18 words
The process according to claim 1 wherein said organic binder is one which evolves a gas upon heating.
Claim 4
Dependent Claim
34 words
The process according to claim 1 wherein said electrically-conductive particles are selected from the group consisting of nickel, stainless steel, chromium, cobalt, aluminum, antimony, copper, silver, platinum, palladium, gold, and alloys and oxides thereof.
Claim 5
Dependent Claim
19 words
The process according to claim 1 wherein the size of said particles is from about 0.01 to 10 microns.
Claim 6
Dependent Claim
19 words
The process according to claim 4 wherein the size of said particles is from about 0.1 to 1 microns.
Claim 7
Dependent Claim
18 words
The process according to claim 1 wherein the transferred electrically-conductive particles are arranged in a perimeter grid pattern.
Claim 8
Dependent Claim
16 words
The process according to claim 1 wherein the source of said electromagnetic radiation is a laser.
Claim 9
Dependent Claim
21 words
The process according to claim 7 wherein said laser is an excimer laser, gas laser, diode laser, or solid state laser.
Claim 10
Dependent Claim
28 words
The process according to claim 7 wherein the laser dwell time is about 0.001 to 50 microseconds and the fluence is about 0.01 to 5 J/cm 2 .
Claim 11
Dependent Claim
17 words
The process according to claim 1 wherein the source of said electromagnetic radiation is a flash lamp.
Claim 12
Dependent Claim
15 words
The process according to claim 1 wherein said first electrode-containing material comprises a semiconductor chip.
Claim 13
Dependent Claim
16 words
The process according to claim 11 wherein the transferred electrically-conductive particles comprise a grid of dots.
Claim 14
Dependent Claim
16 words
The process according to claim 12 wherein said second electrode-containing material comprises a flexible circuit board.
Claim 15
Dependent Claim
16 words
The process according to claim 12 wherein said second electrode-containing material comprises a flat panel display.
Claim 16
Dependent Claim
15 words
The process according to claim 1 wherein the adhesive receptor comprises the first electrode-containing material.
Claim 17
Dependent Claim
116 words
A process for establishing electrical interconnection between two electrode containing materials using a patterned Z-axis adhesive comprising the steps of: (a) providing a donor element comprising a substrate having coated thereon a layer comprising electrically-conductive particles dispersed in an organic binder; (b) placing said donor element in intimate contact with a receptor; (c) imagewise exposing said donor element to electromagnetic radiation under conditions sufficient to transfer said electrically-conductive particles from said donor element to said receptor in a patterned fashion; (d) applying an adhesive layer to the surface of said receptor bearing the conductive particles to form the patterned Z-axis adhesive; and (e) bonding together a first and a second electrode-containing material with the Z-axis adhesive.
Claim 18
Dependent Claim
116 words
A process for establishing electrical interconnection between two electrode containing materials using a patterned Z-axis adhesive comprising the steps of: (a) providing a donor element comprising a substrate having coated thereon a layer comprising electrically-conductive particles dispersed in an organic binder; (b) placing said donor element in intimate contact with a receptor; (c) imagewise exposing said donor element to electromagnetic radiation under conditions sufficient to transfer said electrically-conductive particles from said donor element to said receptor in a patterned fashion; (d) applying an adhesive layer to the surface of said receptor bearing the conductive particles to form the patterned Z-axis adhesive; and (e) bonding together a first and a second electrode-containing material with the Z-axis adhesive.
Claim 19
Dependent Claim
18 words
The process according to claim 16 wherein said organic binder is one which evolves a gas upon heating.
Claim 20
Dependent Claim
34 words
The process according to claim 16 wherein said electrically-conductive particles are selected from the group consisting of nickel, stainless steel, chromium, cobalt, aluminum, antimony, copper, silver, platinum, palladium, gold, and alloys and oxides thereof.
Claim 21
Dependent Claim
19 words
The process according to claim 16 wherein the size of said particles is from about 0.01 to 10 microns.
Claim 22
Dependent Claim
19 words
The process according to claim 19 wherein the size of said particles is from about 0.1 to 1 microns.
Claim 23
Dependent Claim
18 words
The process according to claim 16 wherein the transferred electrically-conductive particles are arranged in a perimeter grid pattern.
Claim 24
Dependent Claim
16 words
The process according to claim 16 wherein the source of said electromagnetic radiation is a laser.
Claim 25
Dependent Claim
21 words
The process according to claim 22 wherein said laser is an excimer laser, gas laser, diode laser, or solid state laser.
Claim 26
Dependent Claim
28 words
The process according to claim 22 wherein the laser dwell time is about 0.001 to 50 microseconds and the fluence is about 0.01 to 5 J/cm 2 .
Claim 27
Dependent Claim
17 words
The process according to claim 16 wherein the source of said electromagnetic radiation is a flash lamp.
Claim 28
Dependent Claim
15 words
The process according to claim 16 wherein said first electrode-containing material comprises a semiconductor chip.
Claim 29
Dependent Claim
16 words
The process according to claim 26 wherein the transferred electrically-conductive particles comprise a grid of dots.
Claim 30
Dependent Claim
16 words
The process according to claim 27 wherein said second electrode-containing material comprises a flexible circuit board.
Claim 31
Dependent Claim
16 words
The process according to claim 27 wherein said second electrode-containing material comprises a flat panel display.
Claim 32
Dependent Claim
14 words
The process according to claim 16 wherein the receptor comprises the first electrode-containing material.
References Cited (Backward Citations)
US2822509A
Cited
US3787210A
Cited
US3964389A
Cited
US3962513A
Cited
US4113981A
Cited
US4244605A
Cited
US4374691A
Cited
US4606962A
Cited
US4731282A
Cited
US4735847A
Cited
US4549824A
Cited
US4959008A
Cited
US4869767A
Cited
US4740657A
Cited
US5089372A
Cited
US4853252A
Cited
US4749120A
Cited
US4859263A
Cited
DE3741916A1
Cited
US5300340A
Cited
US5240761A
Cited
US5001542A
Cited
US5120665A
Cited
US5156938A
Cited
EP0414140A2
Cited
EP0421709A1
Cited
WO1991017840A1
Cited
US5017547A
Cited
US5171650A
Cited
US5256506A
Cited
US5260761A
Cited
US5087494A
Cited
EP0512546A1
Cited
US5275856A
Cited
US5278023A
Cited
US5366140A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-11-10 | 2001-05-12 | 2001-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-11-10 | 2005-05-12 | 2005-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-11-10 | 2009-05-12 | 2009-11-11 | $7700.00 | Window Closed / Lapsed |