Use of a swellable plastic and process for making a resistive moisture sensor

摘要

PCT No. PCT/AT90/00084 Sec. 371 Date Feb. 28, 1992 Sec. 102(e) Date Feb. 28, 1992 PCT Filed Aug. 29, 1990 PCT Pub. No. WO91/03734 PCT Pub. Date Mar. 21, 1991.A process is disclosed for producing a swellable plastic resistive moisture sensor comprising dispersing an additive selected from the group consisting of carbon in powder, dust or soot form, carbon black, graphite, a metal in powder or dust form, and mixtures thereof, into a plastic comprising a polyimide or a copolyimide or both formed from diisocyanate and dianhydride reactants.