Method of making bubble and foreign particle free electrically conductive polyurethanes.

摘要

A method of making an electrically conductive polyurethane elastomer that is substantially free of bubbles and foreign particles comprising: forming a prepolymer of a polyol and an isocyanate, forming a liquid mixture of an ionic conductive additive and amounts of cross linking agent and chain extenders sufficient to provide a crosslinked elastomer; filtering the liquid mixture of additive, crosslinking agents and chain extenders to remove foreign particles; preheating the liquid mixture to a temperature below the decomposition temperature and above the melting temperature of the additive, crosslinking agents and chain extenders in a degassing oven to degass to less than 5 mm of mercury to break any bubbles in the mixture and remove moisture; to a vacuum reactor mixer having two input ports, adding the prepolymer and the preheated degassed liquid mixture and mixing under a vacuum of less than 5 mm of mercury of a period of time to provide a uniform mixture: removing the mixture from the vacuum reactor mixer and forming it into the desired shape; and curing the formed shape to an elastomer substantially free of bubbles and foreign particles.