US4508766A
Expired / Lapsed
US
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Process for producing aromatic imide polymer laminate material
Assignee: Ube Corp
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Filing: 1983-04-21
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Granted: 1985-04-02
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Expires: 2003-04-21
Abstract
Abstract An aromatic imide polymer laminate material usable as a flexible circuit board substrate is produced by the process comprising coating a surface of a metallic foil with a solution of an aromatic imide polymer comprising at least 90 molar % of recurring unit of the formula (I): <IMAGE> (I) wherein R is a symmetrical bivalent aromatic radical having no substituent, and dissolved in a solvent consisting essentially of at least one phenolic compound; and heat drying the resultant solution layer to form an aromatic imide polymer solid layer firmly bonded directly to the metallic foil.
Inventors
- 👤 Toshihiro Inaike
- 👤 Katsuhiko Ushimi
- 👤 Shuji Yamamoto
- 👤 Toshihiro Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:09
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/032; H05K1/0346; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31721
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
97 words
A process for producing an aromatic imide polymer laminate material, comprising coating a surface of a metallic foil with a solution of at least one aromatic imide polymer comprising at least 90 molar% of at least one type of recurring unit of the formula (I): ##STR6## wherein R represents a symmetrical bivalent aromatic radical having no substituent, and dissolved in a solvent consisting essentially of at least one phenolic compound; and heat evaporating said solvent from said aromatic imide polymer solution layer to form an aromatic imide polymer solid layer firmly bonded directly to said metallic foil.
Claim 2
Dependent Claim
97 words
A process for producing an aromatic imide polymer laminate material, comprising coating a surface of a metallic foil with a solution of at least one aromatic imide polymer comprising at least 90 molar% of at least one type of recurring unit of the formula (I): ##STR6## wherein R represents a symmetrical bivalent aromatic radical having no substituent, and dissolved in a solvent consisting essentially of at least one phenolic compound; and heat evaporating said solvent from said aromatic imide polymer solution layer to form an aromatic imide polymer solid layer firmly bonded directly to said metallic foil.
Claim 3
Dependent Claim
53 words
The process as claimed in claim 1, wherein said symmetrical bivalent aromatic radical represented by R in formula (I) is of the symmetrical formula (II): ##STR7## wherein X represents a radical selected from the group consisting of --O--, --CH 2 --, --C(CH 3 ) 2 --, --S--, --CO--, --SO 2 -- and --SO--.
Claim 4
Dependent Claim
50 words
The process as claimed in claim 1, wherein said aromatic imide polymer is a polymerization-imidization product with at least one biphenyl tetracarboxylic acid compound selected from the group consisting of 3,3',4,4'-biphenyl tetracarboxylic acid, 2,3,3',4'-biphenyl tetracarboxylic acid, and their dianhydrides with at least one symmetrical aromatic primary diamine having no substituent.
Claim 5
Dependent Claim
60 words
The process as claimed in claim 3, wherein said symmetrical aromatic primary diamine is of formula (IIa): ##STR8## wherein X represents a radical selected from the group consisting of --O--, --CH 2 --, --C(CH 3 ) 2 --, --S--, --CO--, --SO 2 -- and --SO--, and the --NH 2 radicals are positioned symmetrically to each other about the radical X.
Claim 6
Dependent Claim
27 words
The process as claimed in claim 3, wherein said symmetrical aromatic primary diamine is selected from the group consisting of 4,4'-diaminodiphenylether, 4,4'-diaminodiphenylthioether, 4,4'-diaminobenzophenone, 4,4'-diaminodiphenylmethane, 4,4'-diaminodiphenylsulfone, and 2,2'-bis(4-aminophenyl)propane.
Claim 7
Dependent Claim
24 words
The process as claimed in claim 1, wherein said phenolic compound is selected from the group consisting of phenol, cresol, nitrophenols, and halogenated phenols.
Claim 8
Dependent Claim
22 words
The process as claimed in claim 1, wherein said aromatic imide polymer is in a concentration of 5% to 30% by weight.
Claim 9
Dependent Claim
48 words
The process as claimed in claim 1, wherein said aromatic imide polymer has a degree of imidization of 95% or more and a logarithmic viscosity of from 0.7 to 6 determined in a concentration of 0.5 g per 100 ml of 4-chlorophenol at a temperature of 50° C.
Claim 10
Dependent Claim
40 words
The process as claimed in claim 1, wherein said metallic foil consist essentially of at least one electroconductive metal selected from copper, tungsten, nickel, chromium, iron, silver, aluminum, lead, tin, and alloys comprising one or more of the above-mentioned metals.
Claim 11
Dependent Claim
19 words
The process as claimed in claim 1, wherein said metallic foil has a thickness of 10 to 100 microns.
Claim 12
Dependent Claim
18 words
The process as claimed in claim 1, wherein said surface of said metallic foil is a roughened surface.
Claim 13
Dependent Claim
23 words
The process as claimed in claim 1, wherein said aromatic imide polymer solution layer has a thickness of from 50 to 1000 microns.
Claim 14
Dependent Claim
42 words
The process as claimed in claim 1, wherein said heat evaporation procedure is carried out by gradually elevating the temperature of the ambient atmosphere of said aromatic imide polymer solution layer from the ambient temperature to from 250° C. to 400° C.
Claim 15
Dependent Claim
24 words
The process as claimed in claim 1, wherein the resultant aromatic imide polymer solid layer has a thickness of from 10 to 150 microns.
References Cited (Backward Citations)
US4411952A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-04-01 | 1988-10-01 | 1989-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-01 | 1992-10-01 | 1993-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-01 | 1996-10-01 | 1997-04-02 | $7700.00 | Window Closed / Lapsed |