Patent US5372891A successfully refreshed from Google Patents.
US5372891A
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Flexible copper/polyimide and barbituric acid modified bismaleimide blend/polyimide laminate
Assignee: Industrial Technology Research Institute
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Filing: 1992-12-16
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Granted: 1994-12-13
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Expires: 2012-12-16
Abstract
Abstract An improved polyimide-based coating composition comprising a polyimide upper layer and a polyimide-modified bismaleimide lower layer for use as a coating on metal substrate, such as an electrolytic copper foil. The polyimide are prepared from reactions between diamines, such as p-phenylene diamine and 4-4'-diaminodiphenyl ether, and dianhydrides, such as 3,3',4,4'-benzophenone tetracarboxylic dianhydride and biphenyl-3,3',4,4'-tetracarboxylic dianhydride. The modified bismaleimide can be prepared from reacting an N,N',4,4'-diphenyl bismaleimide with a barbituric acid or its derivative. A double-layered extrusion coating technique having a double-layered extrusion die is utilized to apply the coating composition onto the metal substrate. The final laminated products show improved peel strength between the polyimide coating and the substrate, as well as improved dimensional stability and surface flatness thereof.
Inventors
- 👤 Tsai-An Yu
- 👤 Jing-Pin Pan
- 👤 Han-Lung Chen
- 👤 Jinn-Shing King
- 👤 Tsung-Hsiung Wang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:09
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1003; C08G73/1007; C08G73/101; C08L; C08L79/00; C08L79/04; C08L79/08; C09; C09J; C09J179/00; C09J179/04; C09J179/08; C09J179/085; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/032; H05K1/0346; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31681; Y10T428/31721
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
56 words
A laminate comprising: (a) a copper substrate, (b) an upper layer consisting essentially of a polyimide resin, and (c) a lower layer disposed between said upper layer and said copper substrate, wherein the lower layer consisting essentially of a mixture of said polyimide resin, which made up said upper layer, and a barbituric acid modified bismaleimide.
Claim 2
Dependent Claim
56 words
A laminate comprising: (a) a copper substrate, (b) an upper layer consisting essentially of a polyimide resin, and (c) a lower layer disposed between said upper layer and said copper substrate, wherein the lower layer consisting essentially of a mixture of said polyimide resin, which made up said upper layer, and a barbituric acid modified bismaleimide.
Claim 3
Dependent Claim
26 words
The laminate of claim 1 wherein said polyimide resin is prepared from the reaction between one or more diamine compounds and one or more dianhydride compounds.
Claim 4
Dependent Claim
20 words
The laminate of claim 2 wherein the molar ratio between said dianhydride and said diamine ranges between 0.96 and 0.99.
Claim 5
Dependent Claim
22 words
The laminate of claim 2 wherein said diamine compound is selected from the group consisting essentially of p-phenyl diamine and 4,4'-diaminodiphenyl ether.
Claim 6
Dependent Claim
22 words
The laminate of claim 2 wherein said dianhydride compound is selected from the group consisting essentially of 3,3',4,4'-benzophenonetetracarboxylic dianhydride and biphenyl-3,3',4,4'-tetracarboxylic dianhydride.
Claim 7
Dependent Claim
60 words
The laminate of claim 1 wherein polyimide resin is prepared from the following process: (a) adding p-phenylene diamine and 4,4'-diaminodiphenyl ether at a predetermined ratio into a mixture solvent consisting essentially of N-methyl-2-pyrrolidone and toluene; (b) adding 3,3',4,4'-benzophenonetetracarboxylic dianhydride into the mixture solution prepared from step (a); and (c) gradually adding biphenyl-3,3',4,4'-tetracarboxylic dianhydride into the solution prepared from step (b).
Claim 8
Dependent Claim
75 words
The laminate of claim 1 wherein said bismaleimide is a modified bismaleimide prepared from the reaction between the following two groups of compounds: (a) Barbituric acid or its derivative, represented by the following formula: ##STR3## wherein R 1 and R 2 can be selected independently from the group consisting of hydrogen, aliphatic or aromatic groups; and (b) an N,N',4,4'-diphenyl bismaleimide represented by the following formula: ##STR4## wherein R can be either methyl group or oxygen.
Claim 9
Dependent Claim
25 words
The laminate of claim 1 wherein said upper layer and said lower layer being simultaneously applied onto said copper substrate in a double-layered coating process.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-12-12 | 1998-06-13 | 1998-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-12-12 | 2002-06-13 | 2002-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-12-12 | 2006-06-13 | 2006-12-13 | $7700.00 | Window Closed / Lapsed |