Patent US4675246A successfully refreshed from Google Patents.
US4675246A
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US
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Flexible multilayer polyimide laminates
Assignee: Akzo NV
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Filing: 1985-06-20
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Granted: 1987-06-23
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Expires: 2005-06-20
Abstract
Abstract The invention relates to laminates comprising at least one layer of an intractable, fully aromatic polyimide which, on one side, is directly bonded to a layer of a substrate and, on the other side, to a layer of a heat-sealable polyimide. The basic elements thus produced may be bonded to one another on the heat-sealable polyimide sides or one basic element may be bonded to another layer of substrate. Further layers may be bonded to one or both outside(s) of the laminates. The laminates may be produced by a novel temperature-controlled process. The substrates are preferably foils of metals or alloys. The multilayer laminates obtained are distinguished by outstanding mechanical, thermal and electrical properties. They may be used as reinforcing materials or for printed electrical circuits.
Inventors
- 👤 Ernst F. Kundinger
- 👤 Erich Klimesch
- 👤 Hans G. Zengel
- 👤 Jeffrey D. Lasher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:42
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/28; B32B27/281; B05; B05D; B05D7/00; B05D7/14; B05D7/16; B32B15/00; B32B15/04; B32B15/08; B32B15/18; B32B15/20; B32B27/06; B32B27/08; B32B27/12; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/032; H05K1/0346; H05K1/0353; H05K1/036; B32B2250/00; B32B2250/24; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/50; B32B2307/54; 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; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2942; Y10T428/2947; Y10T428/2964; Y10T428/2967; Y10T428/31504; Y10T428/31678; Y10T428/31681; Y10T428/31721
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
120 words
A flexible laminate comprising at least one layer of a substrate and at least one layer of a fully aromatic, intractable polyimide, said layer of intractable polyimide being directly bonded on one side to said layer of substrate with a peel strength of at least 4.0 N/cm, said intractable polyimide being insoluble in phenolic solvents and said layer of intractable polyimide having a tensile strength of from 100 to 150 N/mm 2 , a breaking elongation of from 15 to 100% and a dielectric dissipation factor of from 1.5×10 -3 to 5×10 -3 at 1 kHz, a layer of a heat-sealable polyimide being present on that side of the layer of intractable polyimide which is not bonded to the substrate.
Claim 2
Dependent Claim
120 words
A flexible laminate comprising at least one layer of a substrate and at least one layer of a fully aromatic, intractable polyimide, said layer of intractable polyimide being directly bonded on one side to said layer of substrate with a peel strength of at least 4.0 N/cm, said intractable polyimide being insoluble in phenolic solvents and said layer of intractable polyimide having a tensile strength of from 100 to 150 N/mm 2 , a breaking elongation of from 15 to 100% and a dielectric dissipation factor of from 1.5×10 -3 to 5×10 -3 at 1 kHz, a layer of a heat-sealable polyimide being present on that side of the layer of intractable polyimide which is not bonded to the substrate.
Claim 3
Dependent Claim
54 words
A laminate as claimed in claim 1, wherein at least two layers of intractable polyimides are each bonded to a layer of a substrate, and said at least two layers of intractable polyimides are bonded to one another by said layer of heat-sealable polyimide on those sides which are not bonded to the substrate.
Claim 4
Dependent Claim
28 words
A laminate as claimed in claim 1, wherein at least one layer of substrate is directly bonded on each side to a layer of intractable, fully aromatic polyimide.
Claim 5
Dependent Claim
26 words
A laminate as claimed in claim 1, wherein the bonding between the intractable polyimide and the heat-sealable polyimide is established by mutual penetration into one another.
Claim 6
Dependent Claim
50 words
A laminate as claimed in claim 1, wherein the laminated intractable polyimide and heat-sealable polyimide has a tensile strength of from 100 to 150 N/mm 2 , a breaking elongation of from 15 to 100% and a dielectric dissipation factor of from 1.5×10 -3 to 5×10 -3 at 1 kHz.
Claim 7
Dependent Claim
22 words
A laminate as claimed in claim 1, wherein each said layer of intractable polyimide is from 1 μm to 1 mm thick.
Claim 8
Dependent Claim
22 words
A laminate as claimed in claim 6, wherein each said layer of intractable polyimide is from 1 μm to 15 μm thick.
Claim 9
Dependent Claim
22 words
A laminate as claimed in claim 6, wherein each said layer of intractable polyimide is from 10 μm to 1 mm thick.
Claim 10
Dependent Claim
21 words
A laminate as claimed in claim 8, wherein each layer of said intractable polyimide is from 50 to 250 μm thick.
Claim 11
Dependent Claim
21 words
A laminate as claimed in claim 1, wherein the said layer of heat-sealable polyimide is from 0.5 to 3 μm thick.
Claim 12
Dependent Claim
21 words
A laminate as claimed in claim 1, wherein each said layer of heat-sealable polyimide is from 2 to 50 μm thick.
Claim 13
Dependent Claim
19 words
A laminate as claimed in claim 2, wherein all of said layers of intractable polyimide have the same thickness.
Claim 14
Dependent Claim
42 words
A laminate as claimed in claim 1, wherein at least one said layer of intractable polyimide consists of a polyimide which has the following recurring structure ##STR14## in which R is a tetravalent aromatic group and R' is a divalent aromatic group.
Claim 15
Dependent Claim
15 words
A laminate as claimed in claim 13, wherein R represents ##STR15## and R' represents ##STR16##
Claim 16
Dependent Claim
41 words
A laminate as claimed in claim 1, wherein at least one said substrate layer is a foil of at least one member selected from the group consisting of a metal, a metal alloy, a polymer film and a sheet-form fibrous material.
Claim 17
Dependent Claim
50 words
A laminate as claimed in claim 15, wherein said at least one said substrate is a foil of at least one member selected from the group consisting of copper, nickel, aluminum, an alloy which contains one or more of these metals as a substantial constituent, an amorphous metal and steel.
Claim 18
Dependent Claim
20 words
A laminate as claimed in claim 16, wherein said foil comprises rolled, annealed copper or a rolled, annealed copper alloy.
Claim 19
Dependent Claim
17 words
A laminate as claimed in claim 16, wherein said foil is from 5 to 250 μm thick.
Claim 20
Dependent Claim
17 words
A laminate as claimed in claim 18, wherein said foil is from 10 to 50 μm thick.
Claim 21
Dependent Claim
50 words
A laminate as claimed in claim 1, wherein said heat-sealable polyimide is the reaction product of at least one of benzophenone tetracarboxylic acid dianhydride (BTDA) and a mixture of BTDA and pyromellitic acid dianhydride with at least one of 4,4'-diaminodiphenyl ether, 3,3'-diaminodiphenylether, 3,3'-diaminodiphenylsulfone, 3,3'-diaminodiphenylmethane, 4,4'-diaminodiphenyl sulfone, 4,4'-diaminodiphenyl methane and benzidine.
Claim 22
Dependent Claim
132 words
A laminate as claimed in claim 1, wherein said heat-sealable polyimide is the reaction product of a dianhydride with a diamine, said dianhydride corresponding to the formula ##STR17## in which X is selected from the group consisting of an oxygen atom, a C n F 2n group where n=1-10, and the group ##STR18## wherein R is a hydrogen atom or a fluorine atom and wherein the (CR 3 ) 2 group is in the meta or para-position to the associated oxygen atom, and said diamine corresponding to the formula ##STR19## or to the formula ##STR20## in which Y is selected from the group consisting of an oxygen atom, a C n F 2n group where n=1-10, and a carbonyl group, Y being in the meta- or para-position to the associated amino group.
Claim 23
Dependent Claim
17 words
A laminate as claimed in claim 1, wherein said layer of heat-sealable polyimide contains a fibrous material.
Claim 24
Dependent Claim
31 words
A laminate as claimed in claim 22, wherein said fibrous material comprises at least one member selected from the group consisting of glass fibers, aramide fibers, carbon fibers and silica fibers.
Claim 25
Dependent Claim
18 words
A laminate as claimed in claim 22, wherein said fibrous material is a woven fabric of continuous filaments.
Claim 26
Dependent Claim
24 words
A laminate as claimed in claim 2, wherein said layers of intractable polyimides are bonded to one another by two layers of heat-sealable polyimide.
Claim 27
Dependent Claim
39 words
A laminate as claimed in claim 1, wherein a layer of substrate is present on said layer of heat-sealable polyimide on a side of said layer of heat-sealable polyimide which is not bonded to said layer of intractable polyimide.
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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) | 1990-06-22 | 1990-12-22 | 1991-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-22 | 1994-12-22 | 1995-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-22 | 1998-12-22 | 1999-06-23 | $7700.00 | Window Closed / Lapsed |