Heat-proof electric wire having a benzimidazole-based polymer coating

U.S. Patent Number: 5725953

Abstract: An insulating material comprised of a benzimidazole-based polymer layer and a fluorine-containing rubber layer. This material is heat-resistant and is especially useful for use in electric wires. To manufacture such wires, a varnish solution is prepared by dissolving partially polymerized benzimidazole-based polymers in a solvent, then adding a polymerization initiator thereto. Subsequently, an electric wire is soaked in the solution and heated to cross-link the benzimidazole-based polymers. By repeating this procedure, the electric wire is coated with any desired thickness of a benzimidazole-based polymer layer. This coated wire is further coated with a fluorine-containing rubber layer to obtain a heat-resistant electric wire that is also resistant to dielectric breakdown.

Inventors: Onishi; Yasuhiko (Yokkaichi, JP), Itoh; Takashi (Yokkaichi, JP), Tamura; Yoshihiro (Yokkaichi, JP)

Assignee: Sumitomo Wiring Systems, Ltd. (JP)

Application Number: 08/650,064

Issued: 1998-03-10

Expired: 2006-03-10

Classes: 428/383 ; 174/110FC; 174/110SR; 428/373; 428/379

Field of search: 428/421,422,379,383,375 174/11FC,11SR

Click the image above to view patent images at uspto.gov within a frame.

Click here for the fulltext page on uspto.gov within a frame.