Method of making an electrically conductive polyurethane foam
US5082870A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 2, 1990 |
| Grant date | Jan 21, 1992 |
| Priority date | — |
| Expiry date | Mar 2, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2110/0083
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electrically conductive flexible polyurethane foam having fine and homogeneous cells, being low in swelling by water and superior in dimensional stability can be prepared by mixing an isocyanate terminated urethane prepolymer holding isocyanate monomers therein prepared by reacting polyether polyol(s) holding poly(oxypropylene) chains and not more than 30 weight % of poly(oxyethylene) chains therein with a stoichiometrically excessive amount of an isocyanate component with an aqueous dispersion of electrically conductive carbon particles containing water in excess of the stoichiometric amount necessary to react with the isocyanate monomers in the urethane prepolymer and foaming the mixture in a closed mold having a capacity smaller than the volume of a foam which can be obtained by conducting the foaming of the said mixture of the urethane prepolymer and the aqueous dispersion of electrically conductive carbon particles freely under atmospheric pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.