Patent US5741598A successfully refreshed from Google Patents.
US5741598A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyimide/metal composite sheet
Assignee: Ube Corp
•
Filing: 1996-07-31
•
Granted: 1998-04-21
•
Expires: 2016-07-31
Abstract
Abstract A polyimide/metal composite sheet is composed of a polyimide substrate film (made of polyimide prepared by reaction of symmetric biphenyltetracarboxylic acid dianhydride and p-phenylenediamine, and optionally 4,4'-diaminodiphenyl ether), a polyimide intervening layer (made of polyimide prepared by reaction of asymmetric biphenyltetracarboxylic acid dianhydride and 1,3-bis(4-aminophenoxy)benzene), and a metal foil. The polyimide substrate film and the intervening polyimide layer are firmly combined and hardly peelable from each other, and the intervening polyimide layer and the metal foil are combined strongly by hot-melt.
Inventors
- 👤 Akinori Shiotani
- 👤 Hiroaki Yamaguchi
- 👤 Fumio Aoki
- 👤 Katsutoshi Washio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:19
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; B32B7/00; B32B7/04; B32B7/12; B32B15/20; B32B27/00; B32B27/18; B32B27/28; B32B27/281; B32B27/34; C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1046; C08G73/105; C08G73/1075; C08G73/1078; C08J; C08J7/00; C08J7/04; C08J7/0427; C08L; C08L79/00; C08L79/04; C08L79/08; C09; C09D; C09D179/00; C09D179/04; C09D179/08; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/032; H05K1/0346; B32B2250/00; B32B2250/02; B32B2255/00; B32B2255/10; B32B2255/26; B32B2307/00; B32B2307/30; B32B2307/306; B32B2307/70; B32B2307/732; B32B2307/748; B32B2457/00; B32B2457/08; C08J2379/00; C08J2379/04; C08J2379/08; C08J2479/00; H05K1/0353; H05K1/036; H05K2201/00; H05K2201/01; H05K2201/0137; H05K2201/0154; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31681; Y10T428/31721
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
53 words
A composite sheet comprising, in this order, a polyimide substrate film, a polyimide coat, and a metal film, wherein the polyimide substrate film comprises a polyimide having a recurring unit of the following formula (1): ##STR3## and the polyimide coat comprises a polyimide having a recurring unit of the following formula (2): ##STR4##
Claim 2
Dependent Claim
53 words
A composite sheet comprising, in this order, a polyimide substrate film, a polyimide coat, and a metal film, wherein the polyimide substrate film comprises a polyimide having a recurring unit of the following formula (1): ##STR3## and the polyimide coat comprises a polyimide having a recurring unit of the following formula (2): ##STR4##
Claim 3
Dependent Claim
52 words
The composite sheet of claim 1, wherein the polyimide of the polyimide substrate film further comprises a recurring unit of the following formula (3): ##STR5## under the condition that a molar ratio of the recurring unit of the formula (3) per the recurring unit of the formula (1) is 30/70 or less.
Claim 4
Dependent Claim
23 words
The composite sheet of claim 2, wherein the polyimide overcoat is unpeelable from the polyimide substrate film without breakage of the polyimide overcoat.
Claim 5
Dependent Claim
37 words
The composite sheet of claim 2, wherein the metal film is bonded to the polyimide overcoat at a peeling strength of 1.0 kgf/cm or more, said peeling strength being measured according to 90° peeling defined in IPC-TM-(2.4.9).
Claim 6
Dependent Claim
23 words
The composite sheet of claim 1, wherein the polyimide overcoat is unpeelable from the polyimide substrate film without breakage of the polyimide overcoat.
Claim 7
Dependent Claim
37 words
The composite sheet of claim 1, wherein the metal film is bonded to the polyimide overcoat at a peeling strength of 1.0 kgf/cm or more, said peeling strength being measured according to 90° peeling defined in IPC-TM-(2.4.9).
References Cited (Backward Citations)
US5262227A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-04-20 | 2001-10-20 | 2002-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-04-20 | 2005-10-20 | 2006-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-04-20 | 2009-10-20 | 2010-04-21 | $7700.00 | Window Closed / Lapsed |