E.i. Dupont De Nemours and Company

Darrell J Parish

Morton H Katz

James P Ochsner

William E Hawkins

Robert S Mallouk

Susan W Enouen

Paul F Eastman

George M Atkins, Jr

An antistatic aromatic polyimide film containing from 14 to 50% by weight of electrically conductive silica particles coated with a layer of antimony-containing tin oxide and having a surface resistivity ranging from 10.sup.4 to 10.sup.12 ohms/square. The polyimide film exhibits excellent antistatic properties even after heat-treatment at high temperatures of 400.degree. C. or above, while maintaining good heat resistance and mechanical properties. The polyimide film can be used in various applications requiring good antistatic properties such as copier belts, space blankets and flexible circuit substrates.

Antistatic aromatic polyimide film

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.

Coextruded multi-layered, electrically conductive polyimide film

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.

Process for preparing a pigmented polyimide shaped article

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.

Coated, heat-sealable aromatic polyimide film having superior

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.

Method for producing a conductive polyimide structure

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

Conductive polyimide containing carbon black and graphite and

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.

Polyimide articles of intermediate electrical conductivity and a process

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.

Conductive pyrolyzed dielectrics and articles made therefrom

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.

Surface conductive polyimide

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.

Polyimide film

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.

Growing community of inventors

Circleville, OH, United States of America

Darrell J Parish