| abstract |
Process for the production of nanoporous polymer foams, comprising the stagesn a) loading of a single-phase, thermoplastic polymer melt with a gas under a pressure and at a temperature at which the gas is in the supercritical state, b) heating of the laden polymer melt to a temperature which lies in the range from 40° C. under to 40° C. over the glass transition temperature of the unladen polymer melt determinable by means of DSC according to DIN-ISO 11357-2 at a heating rate of 20 K/min, c) depressurization of the polymer melt loaded in stage a) and heated in stage b) with a depressurization rate in the range from 15,000 to 200,000 MPa/sec, andn nthe nanoporous polymer foams with a cell count in the range from 1,000 to 100,000 cells/mm and a density in the range from 10 to 500 kg/m 3 obtainable according to the process. |