Patent EP0459472A1 successfully refreshed from Google Patents.
EP0459472A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Polyimide composite material and process for producing the same
Assignee: Toyota Central R&D Labs Inc
•
Filing: 1991-05-29
•
Granted: —
•
Expires: 2011-05-29
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
EP
Data Source
google_patents
Last Synchronized
2026-11-06 17:15
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: 11
Claim 1
Independent Claim
26 words
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 said polyimide.
Claim 2
Dependent Claim
33 words
A polyimide composite material as claimed in Claim 1, wherein the organic onium ion is at least one selected from the group consisting of monoammonium ion, monopyridinium ion, monophosphonium ion, and monosulfonium ion.
Claim 3
Dependent Claim
29 words
A polyimide composite material as claimed in Claim 1 or 2, wherein the organic onium ion has the main chain which is composed of 6 to 20 carbon atoms.
Claim 4
Dependent Claim
43 words
A polyimide composite material as claimed in any of Claims 1 to 3, 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 5
Dependent Claim
47 words
A polyimide composite material as claimed in any of Claims 1 to 4, 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 6
Dependent Claim
34 words
A polyimide composite material as claimed in any of Claims 1 to 5, wherein the intercalated layered clay mineral is dispersed such that individual layers are separated from one another at the molecular level.
Claim 7
Dependent Claim
53 words
A polyimide composite material as claimed in any of Claims 1 to 6, 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 8
Dependent Claim
46 words
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.
Claim 9
Dependent Claim
53 words
A process for producing a polyimide composite material as claimed in Claim 8, wherein the step for intercalation is accomplished by mixing the layered clay mineral with organic onium ions in at least one protic polar solvent selected from the group consisting of water, methanol, ethanol, propanol, isopropanol, ethylene glycol, 1,4-butanediol, and glycerin.
Claim 10
Dependent Claim
24 words
A process for producing a polyimide composite material as claimed in Claim 8 or 9, wherein said solution is a solution of poly(amic acid).
Claim 11
Dependent Claim
48 words
A process for producing a polyimide composite material as claimed in Claim 8, wherein the mixing of the intercalated clay mineral with a monomer or prepolymer for polyimide is accomplished in at least one aprotic polar solvent selected from the group consisting of N,N-dimethylacetamide, N-methylpyrrolidone, N,N-dimethylformamide, and 1,3-dimethylimidazolidinone.
References Cited (Backward Citations)
DE3810006A1
Cited
DE3803075A1
Cited
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.