Abstract: An electrically conductive polyimide film having good physical properties and uniform electrical conductivity, prepared by coextruding at least two aromatic polyamic acid solutions, one of which contains a conductive carbon filler, to form a conductive multilayer polyimide film, e.g. a two-layer or three-layer polyimide film.

Abstract: A process for preparing a pigmented polyimide article having a polyimide matrix with finely divided pigment particles uniformly dispersed therein. The process includes the steps of milling pigment particles in an organic solvent, pre-wetting the pigment particles with a thermoplastic polyamic acid precursor derived from 4,4'-oxydiphthalic dianhydride and an aromatic and/or aliphatic diamine, admixing the treated pigment particles with a polyamic acid polymerization mixture to form a dope, shaping the dope and thermally or chemically converting the shaped dope into a polyimide article containing the pigment particles uniformly dispersed therein.

Abstract: An aromatic polyimide film coated with a thermally stable, heat-sealable thermoplastic polyimide for use as a wire insulation for superconducting magnets is disclosed. The inclusion of inorganic particles in the film improves compressive strength of the coated polyimide film.

Abstract: An aromatic polyimide film coated with a thermally stable, heat-sealable thermoplastic polyimide for use as a wire insulation for superconducting magnets is disclosed. The inclusion of inorganic particles in the film improves compressive strength of the coated polyimide film.

Abstract: A method for preparing an electrically conductive polyimide article having a polyimide matrix with carbon black and graphite particles uniformly dispersed therein. The method includes the steps of milling carbon black and graphite in a polar solvent to form a slurry, mixing the slurry with polyamide acid to form a dope, shaping the dope, and converting the shaped material into a polyimide article.

Abstract: An electrically conductive polyimide article having a polyimide matrix with carbon black and graphite particles uniformly dispersed therein.

Abstract: A polymeric article having high temperature performance and intermediate electrical conductivity is disclosed. The article has a matrix of polyimide and a filler of conductive particulate material. The degree of conductivity is controlled by an extraction step in the manufacturing process.

Abstract: A conductive dielectric structure is disclosed wherein a thermoplastic matrix has a multitude of electrically conductive channels through its thickness and, optionally, at least one electrically conductive surface which, along with protective and heat seal layers, can be formed into conductive belts.

Abstract: A process is disclosed for treating the surface of a shaped article of polyimide matrix material and finely-divided conductive carbon dispersed material whereby the electrical surface conductivity is increased by a factor of more than a million-fold.

Abstract: A shaped polyimide article is disclosed having finely divided barium sulfate as an additive which lowers the limiting oxygen index in combustion and substantially eliminates ash as a combustion product.

Abstract: A dielectric composition is disclosed having three separate phases, one electrically conductive, combined to yield a compound dispersion with high dielectric constant and low dissipation factor. The composition is made into a film and the film is used in electrical capacitors.