US4699841A
Expired / Lapsed
US
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Flexible multilayer polymide laminates
Assignee: Akzo NV
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Filing: 1986-02-24
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Granted: 1987-10-13
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Expires: 2006-02-24
Abstract
Abstract A multilayer laminate having at least one layer of a no longer formable fully aromatic polyimide and at least one layer of substrate material, the layer of no longer formable polyimide adhering directly on one side to the layer of substrate material with a peel strength of at least 4.0 N/cm. The layer of no longer also formable polyimide is also insoluble in phenolic solvents, has a tensile strength of from 100 to 150 N/mm2, a breaking elongation of from 15 to 100%, a dielectric dissipation factor of from 1.5x10-3 to 5x10-3 at 1 kHz. Additionally, a layer of heat-sealable high-temperature adhesive selected from the class of polyacrylates, polysulfone resins, epoxy resins, fluoropolymer resins, silicone resins or butyl rubbers is joined to that side of the polyimide layer which is remote from the substrate material.
Inventors
- 👤 Ernst F. Kundinger
- 👤 Erich Klimesch
- 👤 Hans-Georg Zengel
- 👤 Jeffery D. Lasher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:24
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/28; B32B27/281; B32B15/00; B32B15/04; B32B15/08; B32B15/18; B32B15/20; B32B7/00; B32B7/04; B32B7/12; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/0353; H05K1/036; H05K2201/00; H05K2201/01; H05K2201/0137; H05K2201/0154; H05K2201/03; H05K2201/0332; H05K2201/0335; H05K2201/0358; H05K2203/00; H05K2203/06; H05K2203/066; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2942; Y10T428/2947; Y10T428/31504; Y10T428/3154; Y10T428/31721
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
163 words
A flexible multilayer laminate comprising (a) at least one layer of a substrate material, said substrate layer having at least a first side and a second side; (b) at least one first layer of no longer formable, fully aromatic polyimide having a first side directly joined to said first side of said substrate layer with a peel strength of at least 4.0 N/cm, said first polyimide layer being insoluble in phenolic solvents, having a tensile strength of from 100 to 150 N/mm 2 , having a breaking elongation of from 15 to 100% and having a dielectric dissipation factor of from 1.5×10 -3 to 5×10 -3 at 1 KHz, said first polyimide layer having a second side remote from said substrate layer; and (c) a layer of a heat-sealable high-temperature adhesive selected from the group consisting of polyacrylates, polysulfone resins, epoxy resins, fluoropolymer resins, silicone resins and butyl rubbers, said adhesive layer being joined to said second side of said first polyimide layer.
Claim 2
Dependent Claim
163 words
A flexible multilayer laminate comprising (a) at least one layer of a substrate material, said substrate layer having at least a first side and a second side; (b) at least one first layer of no longer formable, fully aromatic polyimide having a first side directly joined to said first side of said substrate layer with a peel strength of at least 4.0 N/cm, said first polyimide layer being insoluble in phenolic solvents, having a tensile strength of from 100 to 150 N/mm 2 , having a breaking elongation of from 15 to 100% and having a dielectric dissipation factor of from 1.5×10 -3 to 5×10 -3 at 1 KHz, said first polyimide layer having a second side remote from said substrate layer; and (c) a layer of a heat-sealable high-temperature adhesive selected from the group consisting of polyacrylates, polysulfone resins, epoxy resins, fluoropolymer resins, silicone resins and butyl rubbers, said adhesive layer being joined to said second side of said first polyimide layer.
Claim 3
Dependent Claim
51 words
A laminate according to claim 1, wherein at least one additional layer of no longer formable polyimides is joined to said second side of said first polyimide layer by a heat-sealable high-temperature adhesive selected from the group consisting of polyacrylates, polysulfone resins, epoxy resins, fluoropolymer resins, silicone resins and butyl rubbers.
Claim 4
Dependent Claim
22 words
A laminate according to claim 1, wherein each side of said substrate layer is directly joined to one said first polyimide layer.
Claim 5
Dependent Claim
20 words
A laminate according to claim 1, wherein each said first polyimide layer is from 1 μm to 1 mm thick.
Claim 6
Dependent Claim
20 words
A laminate according to claim 4, wherein each said first polyimide layer is from 10 μm to 1 mm thick.
Claim 7
Dependent Claim
19 words
A laminate according to claim 4, wherein each said first polyimide layer is from 50 to 250 μm thick.
Claim 8
Dependent Claim
16 words
A laminate according to claim 1, wherein all said first polyimide layers have the same thickness.
Claim 9
Dependent Claim
35 words
A laminate according to claim 1, wherein each said first polyimide layer comprises a polyimide which has the following recurring structure ##STR7## wherein R is tetrafunctional aromatic group and R' is a difunctional aromatic group.
Claim 10
Dependent Claim
14 words
A laminate according to claim 8, wherein R represents ##STR8## and R' represents ##STR9##
Claim 11
Dependent Claim
35 words
A laminate according to claim 1, wherein said substrate layer comprises a material selected from the group consisting of a foil of a metal or metal alloy, a polymer film and a sheet-form fibrous material.
Claim 12
Dependent Claim
50 words
A laminate according to claim 10, wherein said substrate layer comprises a metal material selected from the group consisting of a foil of copper, nickel, aluminum, an alloy which contains one or more of these metals as an essential constituent, a foil of amorphous metal and a foil of steel.
Claim 13
Dependent Claim
27 words
A laminate according to claim 11, wherein said substrate layer comprises a foil selected from the group consisting of rolled, tempered copper and rolled, tempered copper alloy.
Claim 14
Dependent Claim
19 words
A laminate according to claim 11, wherein said substrate layer comprises a foil from 5 to 110 μm thick.
Claim 15
Dependent Claim
16 words
A laminate according to claim 12, wherein the foil is from 10 to 50 μm thick.
Claim 16
Dependent Claim
13 words
A laminate according to claim 1, wherein the high-temperature adhesive contains fibrous material.
Claim 17
Dependent Claim
26 words
A laminate according to claim 15, wherein said fibrous material is selected from the group consisting of glass fibers, silica fibers, aramide fibers and carbon fibers.
Claim 18
Dependent Claim
17 words
A laminate according to claim 15, wherein said fibrous material is a woven fabric of endless filaments.
Claim 19
Dependent Claim
23 words
A laminate according to claim 1, wherein at least one of said first polyimide layer and said adhesive layer contains particles of polytetrafluorethylene.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1990-10-12 | 1991-04-13 | 1991-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-12 | 1995-04-13 | 1995-10-13 | $3760.00 | Window Closed / Lapsed |
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