Process for the production of improved dielectric strength materials and the use of materials obtained by this process in the manufacture of power transmission cables
US5929137A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 29, 1997 |
| Grant date | Jul 27, 1999 |
| Priority date | — |
| Expiry date | Sep 29, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J3/005
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The invention relates to a process for the production of a material having an improved dielectric strength and use of said material in the manufacture of power transmission cables. The object of the invention is to obtain mixtures remaining macroscopically very insulating and which locally, at a scale below 1 micron, can have conductivity levels of approximately 10.sup.-9 S.cm.sup.-1. This object is achieved with the aid of a process comprising the following stages: PA0 dissolving at least one conductive polymer in an organic solvent, to form an impregnation solution and impregnating granules constituted by an insulating polymer or a mixture of insulating polymers, PA0 evaporating the solvent to obtain insulating polymer granules covered with a conductive polymer, PA0 drying said granules, PA0 hot mixing or extruding said granules to form a homogeneous mixture, which can be restored to granule form.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.