EP0248617A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Process for making substrates for printed circuit boards
Assignee: Japan Gore Tex Inc
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Filing: 1987-06-01
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Granted: —
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Expires: 2007-06-01
Abstract
Abstract A process is provided for manufacturing a composite of a sheet of expanded, porous polytetrafluoroethylene (PTFE) impregnated with another resin, the other resin being impregnated within the pores of the expanded PTFE. The other resin imparts desired characteristics to the composite such as high thermal resistance and low dielectric constant which make it useful as substrates for printed circuit boards. The composite is useful as a dielectric generally and as an adhesive.
Inventors
- 👤 Minoru Hatakeyama
- 👤 Ichiro Komada
- 👤 Kosuke Moriya
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 10:09
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/046; B32B5/00; B32B5/02; B32B5/22; B32B5/24; B32B5/245; C; C08; C08J; C08J9/00; C08J9/36; C08J9/40; C08J9/42; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/0353; B32B38/00; B32B2038/0052; B32B2038/0076; B32B2260/00; B32B2260/04; B32B2260/046; B32B2262/00; B32B2262/10; B32B2262/101; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/025; B32B2307/00; B32B2307/20; B32B2307/202; B32B2457/00; B32B2457/08; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/18; C08J2423/00; C08J2427/00; C08J2433/00; C08J2461/00; C08J2463/00; C08J2467/00; C08J2477/00; C08J2479/00; C08J2481/00
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
86 words
A process for the manufacture of a composite sheet of a dielectric material comprising impregnating a sheet of porous, expanded, sintered polytetrafluoroethylene (PTFE) with a solution of at least one other resin dissolved in a solvent, heating the impregnated sheet to evaporate and remove said solvent, thereby providing a composite sheet of expanded, porous PTFE containing at least one other resin and air within the pores of said sheet, and thereafter compressing said sheet to expel at least a portion of said air from said sheet.
Claim 2
Dependent Claim
86 words
A process for the manufacture of a composite sheet of a dielectric material comprising impregnating a sheet of porous, expanded, sintered polytetrafluoroethylene (PTFE) with a solution of at least one other resin dissolved in a solvent, heating the impregnated sheet to evaporate and remove said solvent, thereby providing a composite sheet of expanded, porous PTFE containing at least one other resin and air within the pores of said sheet, and thereafter compressing said sheet to expel at least a portion of said air from said sheet.
Claim 3
Dependent Claim
31 words
A process according to claim 1 wherein said sheet is compressed following removal of said solvent to an extent such that substantially all of said air is expelled from said sheet.
Claim 4
Dependent Claim
36 words
A process according to claim 1 wherein said other resin is contained within said sheet in an amount of at least 15 weight percent, based on the total weight of said sheet and said other resin.
Claim 5
Dependent Claim
36 words
A process according to claim 1 wherein said other resin is contained within said sheet in an amount of at least 24 weight percent, based on the total weight of said sheet and said other resin.
Claim 6
Dependent Claim
18 words
A process according to claim 1 wherein said other resin is a thermoplastic resin, or a thermosetting resin.
Claim 7
Dependent Claim
14 words
A process according to claim 1 wherein said . other resin is a fluoropolymer.
Claim 8
Dependent Claim
14 words
A process according to claim 1 including partially or fully curing said other resin.
Claim 9
Dependent Claim
17 words
A process according to claim 1 including incorporating an inorganic particulate filler in said expanded, porous PTFE.
Claim 10
Dependent Claim
20 words
A process according to claim 1 including the step of laminating said composite to a layer of rigid insulating material.
Claim 11
Dependent Claim
60 words
A process according to claim 1 including the step of laminating said composite to a layer of a ceramic, or of fiberglass/epoxy composite sheet, or of gallium arsenide, or to a cloth of glass fibers, or to a layer of quartz fibers or aramide fibers, or to a layer of a polyimide resin, polyether-ketone resin, polyether-sulfone resin, or polyester resin.
Claim 12
Dependent Claim
38 words
ll. A process according to claim 1 including the step of laminating said composite to a sheet of copper, or aluminum or other metal or other electrically conductive material, or to at least one other said composite sheet.
Claim 13
Dependent Claim
57 words
A process according to claim 1 wherein said other resin is an epoxy resin, a polyimide resin, a polyester resin, an acrylic resin, a triazine resin, a bismaleinimide/triazine resin, a polyolefin resin, a polysulfone resin, a polyether-sulfone resin, a fluorinated ethylene propylene resin, a polyether ketone resin, a polyamide resin, a phenolic resin, or a perfluoropropylvinylether resin.
Claim 14
Dependent Claim
15 words
13, A process according to claim 1 including applying a polymeric coating over said composite.
Claim 15
Dependent Claim
30 words
Use of a sheet of porous, expanded PTFE containing at least one other resin within its pores as a dielectric material, or as the dielectric of a printed circuit board.
Claim 16
Dependent Claim
30 words
Use of a sheet of porous, expanded PTFE containing at least one other resin within its pores as a dielectric material, or as the dielectric of a printed circuit board.
References Cited (Backward Citations)
No citation records indexed.
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