US5047283A
Expired / Lapsed
US
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Electrically conductive article
Assignee: PPG Industries Inc
•
Filing: 1989-09-20
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Granted: 1991-09-10
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Expires: 2009-09-20
Abstract
Abstract Microporous material comprising (1) a matrix consisting essentially of thermoplastic organic polymer, (2) a large proportion of finely divided water-insoluble siliceous filler, and (3) interconnecting pores is coated with electrically conductive coating and/or printed with electrically conductive printing ink. The resulting products have many uses as electrically conductive articles, including electromagnetic interference shields and printed circuit boards. Three-dimensional printed circuit boards are disclosed.
Inventors
- 👤 Dennis D. Leatherman
- 👤 Kee V. Sin
- 👤 James A. Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:27
CPC Classifications
B; B32; B32B; B32B9/00; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K9/00; H05K9/0073; H05K9/0081; H05K9/0092; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24322; Y10T428/24802; Y10T428/24917; Y10T428/25; Y10T428/259; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 45
Claim 1
Independent Claim
132 words
An electrically conductive article comprising: (a) at least one sheet of microporous material having generally opposing sides, said microporous material on a coating-free, printing ink-free, impregnant-free and pre-bonding basis comprising: (1) a matrix consisting essentially of substantially water insoluble thermoplastic organic polymer, (2) finely divided substantially water-insoluble filler particles, of which at least about 50 percent by weight are siliceous particles, said filler particles being distributed throughout said matrix and constituting from about 50 to about 90 percent by weight of said microporous material, (3) a network of interconnecting pores communicating substantially throughout said microporous material, said pores constituting at least about 35 percent by volume of said microporous material; and (b) electrically conductive coating or electrically conductive printing ink on at least a portion of at least one of said sides.
Claim 2
Dependent Claim
132 words
An electrically conductive article comprising: (a) at least one sheet of microporous material having generally opposing sides, said microporous material on a coating-free, printing ink-free, impregnant-free and pre-bonding basis comprising: (1) a matrix consisting essentially of substantially water insoluble thermoplastic organic polymer, (2) finely divided substantially water-insoluble filler particles, of which at least about 50 percent by weight are siliceous particles, said filler particles being distributed throughout said matrix and constituting from about 50 to about 90 percent by weight of said microporous material, (3) a network of interconnecting pores communicating substantially throughout said microporous material, said pores constituting at least about 35 percent by volume of said microporous material; and (b) electrically conductive coating or electrically conductive printing ink on at least a portion of at least one of said sides.
Claim 3
Dependent Claim
28 words
The electrically conductive article of claim 1 wherein electrically conductive coating or electrically conductive printing ink is on at least a portion of the other of said sides.
Claim 4
Dependent Claim
59 words
The electrically conductive article of claim 1 wherein said substantially water-insoluble thermoplastic organic polymer comprises essentially linear ultrahigh molecular weight polyolefin which is essentially linear ultrahigh molecular weight polyethylene having an intrinsic viscosity of at least about 18 deciliters/gram, essentially linear ultrahigh molecular weight polypropylene having an intrinsic viscosity of at least about 6 deciliters/gram, or a mixture thereof.
Claim 5
Dependent Claim
32 words
The electrically conductive article of claim 1 wherein said essentially linear ultrahigh molecular weight polyolefin is essentially linear ultrahigh molecular weight polyethylene having an intrinsic viscosity of at least about 18 deciliters/gram.
Claim 6
Dependent Claim
31 words
The electrically conductive article of claim 4 wherein said pores on a coating-free, printing ink-free, impregnant-free, and pre-bonding basis constitute at least about 60 percent by volume of said microporous material.
Claim 7
Dependent Claim
28 words
The electrically conductive article of claim 4 wherein said ultrahigh molecular weight polyethylene has an intrinsic viscosity in the range of from about 18 to about 39 deciliters/gram.
Claim 8
Dependent Claim
30 words
The electrically conductive article of claim 4 wherein said siliceous particles of said microporous material constitute from about 50 percent to about 85 percent by weight of said microporous material.
Claim 9
Dependent Claim
17 words
The electrically conductive article of claim 4 wherein said siliceous particles of said microporous material are silica.
Claim 10
Dependent Claim
19 words
The electrically conductive article of claim 4 wherein said siliceous particles of said microporous material are precipitated silica particles.
Claim 11
Dependent Claim
24 words
The electrically conductive article of claim 9 wherein said precipitated silica particles have an avera§e ultimate particle size of less than about 0.1 micrometer.
Claim 12
Dependent Claim
41 words
The electrically conductive article of claim 4 wherein on a coating-free, printing ink-free, impregnant-free, and pre-bonding basis the volume average diameter of said pores as determined by mercury porosimetry is in the range of from about 0.02 to about 50 micrometers.
Claim 13
Dependent Claim
41 words
The electrically conductive article of claim 4 wherein on a coating-free, printing ink-free, impregnant-free, and pre-bonding basis the volume average diameter of said pores as determined by mercury porosimetry is in the range of from about 0.02 to about 0.5 micrometers.
Claim 14
Dependent Claim
16 words
The electrically conductive article of claim 4 wherein high density polyethylene is present in said matrix.
Claim 15
Dependent Claim
41 words
The electrically conductive article of claim 1 wherein said electrically conductive coating or said electrically conductive printing ink is on at least a portion of one of said sides and at least one of said sides is bonded to a substrate.
Claim 16
Dependent Claim
15 words
The electrically conductive article of claim 14 wherein said sides are substantially planar in form.
Claim 17
Dependent Claim
16 words
The electrically conductive article of claim 14 wherein said sides are three dimensional surfaces in form.
Claim 18
Dependent Claim
127 words
A printed circuit comprising: (a) at least one sheet of microporous material having generally opposing sides, said microporous material on a coating-free, printing ink-free, impregnant-free, and pre-bonding basis comprising: (1) a matrix consisting essentially of substantially water insoluble thermoplastic organic polymer, (2) finely divided substantially water-insoluble filler particles, of which at least about 50 percent by weight are siliceous particles, said filler particles being distributed throughout said matrix and constituting from about 50 to about 90 percent by weight of said microporous material, (3) a network of interconnecting pores communicating substantially throughout said microporous material, said pores constituting at least about 35 percent by volume of said microporous material; and (b) electrically conductive printing ink on at least a portion of at least one of said sides.
Claim 19
Dependent Claim
127 words
A printed circuit comprising: (a) at least one sheet of microporous material having generally opposing sides, said microporous material on a coating-free, printing ink-free, impregnant-free, and pre-bonding basis comprising: (1) a matrix consisting essentially of substantially water insoluble thermoplastic organic polymer, (2) finely divided substantially water-insoluble filler particles, of which at least about 50 percent by weight are siliceous particles, said filler particles being distributed throughout said matrix and constituting from about 50 to about 90 percent by weight of said microporous material, (3) a network of interconnecting pores communicating substantially throughout said microporous material, said pores constituting at least about 35 percent by volume of said microporous material; and (b) electrically conductive printing ink on at least a portion of at least one of said sides.
Claim 20
Dependent Claim
24 words
The printed circuit of claim 17 wherein additional electrically conductive printing ink is on at least a portion of the other of said sides.
Claim 21
Dependent Claim
58 words
The printed circuit of claim 17 wherein said substantially water-insoluble thermoplastic organic polymer comprises essentially linear ultrahigh molecular weight polyolefin which is essentially linear ultrahigh molecular weight polyethylene having an intrinsic viscosity of at least about 18 deciliters/gram, essentially linear ultrahigh molecular weight polypropylene having an intrinsic viscosity of at least about 6 deciliters/gram, or a mixture thereof.
Claim 22
Dependent Claim
31 words
The printed circuit of claim 17 wherein said essentially linear ultrahigh molecular weight polyolefin is essentially linear ultrahigh molecular weight polyethylene having an intrinsic viscosity of at least about 18 deciliters/gram.
Claim 23
Dependent Claim
30 words
The printed circuit of claim 20 wherein said pores on a coating-free, printing ink-free, impregnant-free, and pre-bonding basis constitute at least about 60 percent by volume of said microporous material.
Claim 24
Dependent Claim
27 words
The printed circuit of claim 20 wherein said ultrahigh molecular weight polyethylene has an intrinsic viscosity in the range of from about 18 to about 39 deciliters/gram.
Claim 25
Dependent Claim
29 words
The printed circuit of claim 20 wherein said siliceous particles of said microporous material constitute from about 50 percent to about 85 percent by weight of said microporous material.
Claim 26
Dependent Claim
16 words
The printed circuit of claim 20 wherein said siliceous particles of said microporous material are silica.
Claim 27
Dependent Claim
18 words
The printed circuit of claim 20 wherein said siliceous particles of said microporous material are precipitated silica particles.
Claim 28
Dependent Claim
23 words
The printed circuit of claim 25 wherein said precipitated silica particles have an average ultimate particle size of less than about 0.1 micrometer.
Claim 29
Dependent Claim
40 words
The printed circuit of claim 20 wherein on a coating-free, printing ink-free, impregnant-free, and pre-bonding basis the volume average diameter of said pores as determined by mercury porosimetry is in the range of from about 0.02 to about 50 micrometers.
Claim 30
Dependent Claim
39 words
The printed circuit of claim 20 wherein on a coating-free, printing ink-free, impregnant-free, and pre-bonding the volume average diameter of said pores as determined by mercury porosimetry is in the range of from about 0.02 to about 0.5 micrometers.
Claim 31
Dependent Claim
15 words
The printed circuit of claim 20 wherein high density polyethylene is present in said matrix.
Claim 32
Dependent Claim
9 words
The printed circuit of claim 20 which is flexible.
Claim 33
Dependent Claim
10 words
The printed circuit of claim 20 which is substantially rigid.
Claim 34
Dependent Claim
31 words
The printed circuit of claim 20 wherein said electrically conductive printing ink was applied to at least a portion of at least one of said sides by thick film screen printing.
Claim 35
Dependent Claim
35 words
The printed circuit of claim 20 wherein said electrically conductive printing ink is on at least a portion of one of said sides and at least one of said sides is bonded to a substrate.
Claim 36
Dependent Claim
18 words
The printed circuit of claim 33 wherein said other of said sides is fusion bonded to said substrate.
Claim 37
Dependent Claim
18 words
The printed circuit of claim 34 wherein said substrate comprises organic polymer in contact with said microporous material.
Claim 38
Dependent Claim
14 words
The printed circuit of claim 20 which is a substantially planar printed circuit board.
Claim 39
Dependent Claim
13 words
The printed circuit of claim 20 which is a three-dimensional printed circuit board.
Claim 40
Independent Claim
151 words
A method for producing a three-dimensional printed circuit board comprising: (a) printing electrically conductive printing ink upon at least one side of a sheet of microporous material having generally opposing sides, said microporous material on a coating-free, printing ink-free, impregnant-free, and pre-bonding basis comprising: (1) a matrix consisting essentially of substantially water insoluble thermoplastic organic polymer, (2) finely divided substantially water-insoluble filler particles, of which at least about 50 percent by weight are siliceous particles, said filler particles being distributed throughout said matrix and constituting from about 50 to about 90 percent by weight of said microporous material, (3) a network of interconnecting pores communicating substantially throughout said microporous material, said pores constituting at least about 35 percent by volume of said microporous material; (b) molding the printed microporous material with organic polymer to bond said printed microporous material to said organic polymer and to form said three-dimensional printed circuit board.
Claim 41
Independent Claim
151 words
A method for producing a three-dimensional printed circuit board comprising: (a) printing electrically conductive printing ink upon at least one side of a sheet of microporous material having generally opposing sides, said microporous material on a coating-free, printing ink-free, impregnant-free, and pre-bonding basis comprising: (1) a matrix consisting essentially of substantially water insoluble thermoplastic organic polymer, (2) finely divided substantially water-insoluble filler particles, of which at least about 50 percent by weight are siliceous particles, said filler particles being distributed throughout said matrix and constituting from about 50 to about 90 percent by weight of said microporous material, (3) a network of interconnecting pores communicating substantially throughout said microporous material, said pores constituting at least about 35 percent by volume of said microporous material; (b) molding the printed microporous material with organic polymer to bond said printed microporous material to said organic polymer and to form said three-dimensional printed circuit board.
Claim 42
Dependent Claim
57 words
The method of claim 38 wherein said substantially water-insoluble thermoplastic organic polymer comprises essentially linear ultrahigh molecular weight polyolefin which is essentially linear ultrahigh molecular weight polyethylene having an intrinsic viscosity of at least about 18 deciliters/gram, essentially linear ultrahigh molecular weight polypropylene having an intrinsic viscosity of at least about 6 deciliters/gram, or a mixture thereof.
Claim 43
Dependent Claim
30 words
The method of claim 38 wherein said essentially linear ultrahigh molecular weight polyolefin is essentially linear ultrahigh molecular weight polyethylene having an intrinsic viscosity of at least about 18 deciliters/gram.
Claim 44
Dependent Claim
17 words
The method of claim 40 wherein said siliceous particles of said microporous material are precipitated silica particles.
Claim 45
Dependent Claim
14 words
The method of claim 40 wherein high density polyethylene is present in said matrix.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-09-09 | 1995-03-11 | 1995-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-09 | 1999-03-11 | 1999-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-09 | 2003-03-11 | 2003-09-10 | $7700.00 | Window Closed / Lapsed |