US5164460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyimide composite material and process for producing the same
Assignee: Toyota Central R&D Labs Inc
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Filing: 1991-05-30
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Granted: 1992-11-17
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Expires: 2011-05-30
Abstract
Abstract Disclosed herein is a polyimide composite material which comprises a polyimide-containing resin and a layered clay mineral which is intercalated with organic onium ions and dispersed in the polyimide. Owing to the intercalated clay mineral, the composite material has improved gas and water vapor barrier properties and a small thermal expansion coefficient. Disclosed also herein is a process for producing a polyimide composite material which comprises the steps of intercalating a layered clay mineral with organic onium ions, adding by mixing the intercalated clay mineral to a solution of a monomer or prepolymer for polyimide, removing the solvent, and forming a polyimide. This process makes the layered clay mineral miscible with and dispersible in polyimide.
Inventors
- 👤 Kazuhisa Yano
- 👤 Arimitsu Usuki
- 👤 Akane Okada
- 👤 Toshio Kurauchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:25
CPC Classifications
C; C08; C08K; C08K9/00; C08K9/04; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/032; H05K1/0346; H05K1/0353; H05K1/0373
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
39 words
A polyimide composite material which comprises a polyimide-containing resin, organic monoonium ions and a layered clay mineral, said layered clay mineral being intercalated with the organic monoonium ions not bonding with said polyimide and uniformly dispersed in said polyimide.
Claim 2
Dependent Claim
39 words
A polyimide composite material which comprises a polyimide-containing resin, organic monoonium ions and a layered clay mineral, said layered clay mineral being intercalated with the organic monoonium ions not bonding with said polyimide and uniformly dispersed in said polyimide.
Claim 3
Dependent Claim
33 words
A polyimide composite material as claimed in claim 1, wherein the organic monoonium ion is at least one selected from the group consisting of monoammonium ion, monopyridinium ion, monophosphonium ion, and monosulfonium ion.
Claim 4
Dependent Claim
26 words
A polyimide composite material as claimed in claim 1, wherein the organic monoonium ion has a main chain which is a straight or branched carbon chain.
Claim 5
Dependent Claim
27 words
A polyimide composite material as claimed in claim 3, wherein the organic monoonium ion has the main chain which is composed of 6 to 20 carbon atoms.
Claim 6
Dependent Claim
39 words
A polyimide composite material as claimed in claim 1, wherein the layered clay mineral is at least one selected from the group consisting of: smectite clay minerals comprising montmorillonite, saponite, beidellite, hectorite, and stevensite; vermiculite; halloysite; and swellable mica.
Claim 7
Dependent Claim
25 words
A polyimide composite material as claimed in claim 1, wherein the layered clay mineral has a cation exchange capacity of 50 to 300 meq/100 g.
Claim 8
Dependent Claim
43 words
A polyimide composite material as claimed in claim 1, wherein the intercalated layered clay mineral and the polyimide are mixed in a ratio of 0.01 to 50 parts by weight (for the former) to 50 to 99.99 parts by weight (for the latter).
Claim 9
Dependent Claim
30 words
A polyimide composite material as claimed in claim 1, wherein the intercalated layered clay mineral is dispersed such that individual layers are separated from one another at the molecular level.
Claim 10
Dependent Claim
46 words
A polyimide composite material as claimed in claim 8, wherein at least 50% of the intercalated layered clay mineral is dispersed, with individual layers or groups of less than 5 layers on average orienting parallel to one another or randomly or both without forming a mass.
Claim 11
Dependent Claim
49 words
A polyimide composite material as claimed in claim 1, which further contains at least one component selected from the group consisting of resins other than polyimide, pigments, dyes, glass fiber, metal fiber, metal flake, heat stabilizers, antioxidants, UV light absorbers, light stabilizers, lubricants, plasticizers, antistatic agents, and flame retardants.
Claim 12
Dependent Claim
25 words
A polyimide composite material as claimed in claim 1, wherein said organic monoonium ion has only one onium group as a functional group for bonding.
Claim 13
Dependent Claim
18 words
A polyimide composite material as claimed in claim 1, wherein said organic monoonium ion is an alkylmonoonium ion.
Claim 14
Dependent Claim
17 words
A polyimide composite material as claimed in claim 12, wherein said alkylmonoonium ion is an alkylammonium ion.
Claim 15
Dependent Claim
17 words
A polyimide composite material as claimed in claim 13, wherein said alkylammonium ion is an alkylamine ion.
Claim 16
Dependent Claim
32 words
A polyimide composite material as claimed in claim 14, wherein said alkylamine ion is at least one selected from the group consisting of laurylamine ion, myristylamine ion, palmitylamine ion and stearylamine ion.
Claim 17
Dependent Claim
79 words
A process for producing a polyimide composite material which comprises the steps of: intercalating a layered clay mineral with organic monoonium ions having only one onium group as a functional group for bonding in a protic polar solvent, adding, by mixing, the intercalated clay mineral from which the protic polar solvent is removed, to a solution obtained by dissolving a monomer or prepolymer for polyimide in an aprotic polar solvent, removing the aprotic polar solvent, and forming a polyimide.
Claim 18
Dependent Claim
79 words
A process for producing a polyimide composite material which comprises the steps of: intercalating a layered clay mineral with organic monoonium ions having only one onium group as a functional group for bonding in a protic polar solvent, adding, by mixing, the intercalated clay mineral from which the protic polar solvent is removed, to a solution obtained by dissolving a monomer or prepolymer for polyimide in an aprotic polar solvent, removing the aprotic polar solvent, and forming a polyimide.
Claim 19
Dependent Claim
38 words
A process for producing a polyimide composite material as claimed in claim 16, said protic polar solvent comprises at least one member selected from the group consisting of water, methanol, ethanol, propanol, isopropanol, ethylene glycol, 1,4-butanediol, and glycerin.
Claim 20
Dependent Claim
55 words
A process for producing a polyimide composite material as claimed in claim 16, wherein the monomer for polyimide comprises at least one dianhydride selected from the group consisting of pyromellitic dianhydride, 3,3', 4,4'-biphenyltetracarboxylic dianhydride, and 3,3', 4,4'-benzophenonetetracarboxylic dianhydride, and at least one diamine selected from the group consisting of 4,4'-diaminodiphenyl ether, 3,4'-diaminodiphenyl ether, and p-phenylenediamine.
Claim 21
Dependent Claim
22 words
A process for producing a polyimide composite material as claimed in claim 16, wherein said solution is a solution of poly(amic acid).
Claim 22
Dependent Claim
35 words
A process for producing a polyimide composite material as claimed in claim 16, wherein said aprotic polar solvent comprises at least one amide-type solvent selected from the group consisting of N,N-dimethylacetamide, N-methylpyrrolidone, N,N-dimethylformamide, and 1,3-dimethylimidazolidinone.
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) | 1995-11-17 | 1996-05-18 | 1996-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-17 | 2000-05-18 | 2000-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-17 | 2004-05-18 | 2004-11-17 | $7700.00 | Window Closed / Lapsed |