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

US5348761A · kind A · utility

Assignees

• E & E Elektronik Gesellschaft M.B.H. · AT
• LENZING AKTIENGESELLSCHAFT · AT

Inventors

• Helmut Mitter · Linz, AT
• Walter Scharizer · Linz, AT
• Herbert Sollradl · Eisenlohrsweg, AT
• Norbert Rossak · Schwanenstadt, AT

Key dates

• Filing date: Feb 28, 1992
• Grant date: Sep 20, 1994
• Expiry date: Feb 28, 2012

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S252/963
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

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.