US4519941A
Expired / Lapsed
US
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Metal-filled polyimide/polyepoxide blends of improved electrical conductivity
Assignee: Ingredion Inc
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Filing: 1984-06-15
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Granted: 1985-05-28
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Expires: 2004-06-15
Abstract
Abstract Metal-filled polyimide/polyepoxide blends, characterized by their improved electrical conductivity after curing over blends containing no polyepoxide, comprise carbinol-containing polyimides, conventional liquid polyepoxides, a solvent for the polyimide, noble metal powders (preferably silver), and optionally an amine catalytic curing agent. Conductivity improvements of 100-1000 fold or more are observed.
Inventors
- 👤 Stephen P. Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:50
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/20; H01B1/22; C; C08; C08L; C08L63/00; C08L79/00; C08L79/04; C08L79/08
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
147 words
A metal-filled polyimide/polyepoxide blend, characterized by its improved conductivity after curing over the blend without polyepoxide, which comprises: (a) about 25-50% of a carbinol-containing polyimide consisting essentially of a repeat unit having the structure: ##STR11## wherein Ar is the same or different aromatic radical with the two pairs of attached carbonyl groups situated on adjacent carbon atoms in the Ar radical and R is a divalent aliphatic, cycloaliphatic, aromatic, or heterocyclic radical; (b) about 1-35% of a liquid substituted or unsubstituted alphatic, cycloaliphatic, aromatic, and/or heterocyclic polyepoxide containing at least two epoxy groups; and (c) about 15-74% of an organic solvent for the polyimide; the percentages of (a), (b), and (c) being by weight and totaling 100%; and (d) about 45-90% by weight of an electrically conductive noble metal powder; the percentage of (d) being by weight based on the total weight of the polyimide and polyepoxide.
Claim 2
Dependent Claim
147 words
A metal-filled polyimide/polyepoxide blend, characterized by its improved conductivity after curing over the blend without polyepoxide, which comprises: (a) about 25-50% of a carbinol-containing polyimide consisting essentially of a repeat unit having the structure: ##STR11## wherein Ar is the same or different aromatic radical with the two pairs of attached carbonyl groups situated on adjacent carbon atoms in the Ar radical and R is a divalent aliphatic, cycloaliphatic, aromatic, or heterocyclic radical; (b) about 1-35% of a liquid substituted or unsubstituted alphatic, cycloaliphatic, aromatic, and/or heterocyclic polyepoxide containing at least two epoxy groups; and (c) about 15-74% of an organic solvent for the polyimide; the percentages of (a), (b), and (c) being by weight and totaling 100%; and (d) about 45-90% by weight of an electrically conductive noble metal powder; the percentage of (d) being by weight based on the total weight of the polyimide and polyepoxide.
Claim 3
Dependent Claim
9 words
The blend of claim 1, wherein Ar is ##STR12##
Claim 4
Dependent Claim
9 words
The blend of claim 1, wherein R is ##STR13##
Claim 5
Dependent Claim
16 words
The blend of claim 1, wherein the polyepoxide is a low molecular weight, low viscosity polyepoxide.
Claim 6
Dependent Claim
25 words
The blend of claim 1, wherein the solvent is selected from the group consisting of N-methylpyrrolidinone, dimethylacetamide, butyl cellosolve acetate, carbitol acetate, and mixtures thereof.
Claim 7
Dependent Claim
24 words
The blend of claim 1, wherein the metal powder is selected from the group consisting of gold, silver, platinum, palladium, iridium, and mixtures thereof.
Claim 8
Dependent Claim
20 words
The blend of claim 1, wherein the polyimide is present in an amount of about 25-40% and Ar is ##STR14##
Claim 9
Dependent Claim
25 words
The blend of claim 1, wherein the polyepoxide is present in an amount of about 6-32% and is a low molecular weight, low viscosity polyepoxide.
Claim 10
Dependent Claim
34 words
The blend of claim 1, wherein the solvent is present in an amount of about 25-70% and is selected from the group consisting of N-methylpyrrolidinone, dimethylacetamide, butyl cellosolve acetate, carbitol acetate, and mixtures thereof.
Claim 11
Dependent Claim
33 words
The blend of claim 1, wherein the metal powder is present in an amount of about 50-85% and is selected from the group consisting of gold, silver, platinum, palladium, iridium, and mixtures thereof.
Claim 12
Dependent Claim
33 words
The blend of claim 8, wherein the polyepoxide is an aliphatic diepoxide; an alicyclic diepoxy carboxylate; a diglycidyl ether of bisphenol A; a diglycidyl ether of bisphenol F; or an epoxy phenol novolac.
Claim 13
Dependent Claim
62 words
The blend of claim 11, wherein the aliphatic diepoxide has the structure ##STR15## or wherein the alicyclic diepoxy carboxylate has the structure ##STR16## or wherein the diglycidyl ether of bisphenol A has the structure ##STR17## where m is 0 or greater; wherein the diglycidyl ether of bisphenol F has the structure ##STR18## and wherein the epoxy phenol novolac has the structure ##STR19##
Claim 14
Dependent Claim
53 words
The blend of claim 12, wherein the polyimide is present in an amount of about 30-40%; the polyepoxide is present in an amount of about 15-25%; the solvent is present in an amount of about 30-55% and is N-methylpyrrolidinone; and the metal is present in an amount of about 55-80% and is silver.
Claim 15
Dependent Claim
12 words
The blend of claim 13, wherein in the polyimide Ar is ##STR20##
Claim 16
Dependent Claim
18 words
The blend of claim 14, characterized in that the electrical conductivity is improved by at least one hundredfold.
Claim 17
Dependent Claim
66 words
The blend of claim 1, wherein the carbinol-containing polyimide is prepared by polymerizing and imidizing the bis(methyl half-ester) of 3,3',4,4'-benzhydroltetracarboxylic acid with a diamine selected from the group consisting of 4,4'-methylenedianiline, 4,4'-oxydianiline, 4,4'-sulfonyldianiline, 4,4'-bis(3-aminobenzoyl)diphenyl ether, bis(3-aminopropyl)tetramethyl disiloxane, m-phenylenediamine, 1,6-hexanediamine, and 1,3-bis(3-aminophenoxy)benzene in the solvent for the polyimide using a molar ratio of tetracarboxylic acid compound to diamine of between 12 to 11 and 7 to 8.
Claim 18
Dependent Claim
26 words
The blend of claim 16, wherein the solvent is selected from the group consisting of N-methylpyrrolidinone, dimethyl acetamide, butyl cellosolve acetate, carbitol acetate, and mixtures thereof.
Claim 19
Dependent Claim
32 words
The blend of claim 16, wherein the polyepoxide is an aliphatic diepoxide; an alicyclic diepoxy carboxylate; a diglycidyl ether of bisphenol A; a diglycidyl ether of bisphenol F; or an epoxy phenolnovolac.
Claim 20
Dependent Claim
10 words
The blend of claim 16, wherein the metal is silver.
Claim 21
Dependent Claim
49 words
The blend of claim 16, wherein the diamine is 4,4'-methylene dianiline, 4,4'-oxydianiline, or 4,4'-sulfonyldianiline; wherein the molar ratio is between 12 to 11 and 1 to 1; wherein the solvent is N-methylpyrrolidininone; and wherein the polyepoxide is a low viscosity, low molecular weight aliphatic diepoxide or alicyclic diepoxy carboxylate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1988-05-27 | 1988-11-26 | 1989-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-27 | 1992-11-26 | 1993-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-27 | 1996-11-26 | 1997-05-28 | $7700.00 | Window Closed / Lapsed |