Method of producing conductive plastics
AssigneeSiemens Aktiengesellschaft
InventorsSybille von Tomkewitsch, Hans-Friedrich Schmidt
Life of this patent
Estimating the term…
Abstract
Conductive plastic parts having defined electrical properties within a relatively narrow range are produced by controlling the dosage relationship between a given plastic and a conductive material, such as long-chain conductive lampblack, as a function of an electrical value (i.e., surface resistance) measured at an extruded admixture of the plastic and conductive materials, rather than by a gravimetrical or volumetrical relation.
Claims13
A process for producing a conductive plastic mixture comprising the steps of:
- admixing a selected amount of a plastic material with a selected amount of a conductive material and extruding to obtain a substantially uniform extrudate of said materials;
- measuring the electrical resistance of said extrudate;
- adjusting the quantity of said conductive material relative to the quantity of said plastic material in accordance with a function of the difference between a desired resistance value for such extrudate and such so-measured resistance value thereby to achieve and maintain approximately said desired resistance value for said extrudate.
In a method for the production of a conductive plastic mixed extrudate which comprises a plastic material and a conductive material, the improvement which comprises measuring an electrical value of said extrudate and regulating the dosing relationship between said plastic material and said conductive material as a function of said measured electrical value.
A method for producing a conductive plastic mixture comprising the steps of:
- admixing a selected amount of a polyamide with a selected amount of a conductive long chain lampblack in the presence of a selected amount of a particulate inert silica filler and extruding to obtain a substantially uniform extrudate,
- measuring the electrical resistance of said extrudate,
- adjusting the quantity of said lampblack relative to said polyamide in accordance with a function of the difference between a desired resistance value for such extrudate and such so-measured resistance value thereby to achieve and maintain approximately said desired resistance value for said extrudate.
Dependencies are inferred from the claim text.