Patent FR941581A successfully refreshed from Google Patents.
US5200474A
Expired / Lapsed
US
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Polyimide adhesive composition including barbituric acid modifier
Assignee: Industrial Technology Research Institute
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Filing: 1990-08-22
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Granted: 1993-04-06
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Expires: 2010-08-22
Abstract
Abstract A polyimide adhesive composition is a reaction product of polyamic acid and bismaleimide (I) modified by barbituric acid (II) or the derivatives thereof. Once the present composition is directly coated onto copper foil, the bonding force is greatly improved as compared to compositions without (II) or (I) and (II). Therefore, the adhesive normally used in the manufacture of flexible printed circuits boards and tape automated bonding (TAB) is no longer necessary.
Inventors
- 👤 Ker M. Chen
- 👤 Jing P. Pan
- 👤 Gwo Y. Shiau
- 👤 Tsung H. Wang
- 👤 Wei C. Chang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:33
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/032; H05K1/0346; 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; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31721
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
21 words
A polyimide adhesive composition comprising the reaction product of polyamic acid and bismaleimide modified by barbituric acid or a derivative thereof.
Claim 2
Dependent Claim
21 words
A polyimide adhesive composition comprising the reaction product of polyamic acid and bismaleimide modified by barbituric acid or a derivative thereof.
Claim 3
Dependent Claim
23 words
A polyimide adhesive comprising a heat curable resin composition which includes polyamic acid and bismaleimide modified by barbituric acid or a derivative thereof.
Claim 4
Dependent Claim
23 words
A polyimide adhesive comprising a heat curable resin composition which includes polyamic acid and bismaleimide modified by barbituric acid or a derivative thereof.
Claim 5
Dependent Claim
78 words
A polyimide adhesive composition as claimed in claim 1 or 2, wherein said barbituric acid corresponds to the following formula: ##STR5## wherein R 1 and R 2 are independently selected from the group consisting of --H, --CH 3 , --C 2 H 5 , --C 6 H 5 , --CH(CH 3 ) 2 --CH 2 CH(CH 3 ) 2 , --CH 2 CH 2 CH(CH 3 ) 2 and --CH(CH 3 )CH 2 CH 2 CH 3 .
Claim 6
Dependent Claim
52 words
A polyimide adhesive composition as claimed in claim 1 or 2 wherein said bismaleimide has the structural formula ##STR6## wherein R is an aromatic group, an aliphatic group, a cycloaliphatic group, an aliphatic group containing siloxane or Ph--R 1 --Ph; Ph is phenyl; and R 1 has the same meanings as R.
Claim 7
Dependent Claim
31 words
A polyimide adhesive composition as claimed in claim 1 or 2, wherein the molar ratio of said barbituric acid to said bismaleimide is in the range of between 1/3 and 1/10.
Claim 8
Dependent Claim
44 words
A polyimide adhesive composition as claimed in claim 1 or 2, wherein the percent solids of said modified bismaleimide is in the range of from 5 to 15 percent by weight of the total solids as determined prior to reaction with said polyamic acid.
Claim 9
Dependent Claim
55 words
A polyimide adhesive composition as claimed in claim 1 or 2 wherein said polyamic acid is the reaction product of (i) H 2 N--R'--NH 2 and (ii) ##STR7## wherein R' and R" are independently selected from the group consisting of an aromatic group, an aliphatic group, a cycloaliphatic group and an aliphatic group containing siloxane.
References Cited (Backward Citations)
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JPS6230122A
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JPS62141077A
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JPH01121325A
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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) | 1996-04-05 | 1996-10-05 | 1997-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-05 | 2000-10-05 | 2001-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-05 | 2004-10-05 | 2005-04-06 | $7700.00 | Window Closed / Lapsed |