| abstract |
A foamed web or sheet based on the polymer is obtained by extruding a melt comprising a polymer selected from polysulfone, polyetherimide, polyetherketone, and styrene polymer and a blowing agent, and then foaming the melt. A method of manufacturing comprising: 1 to 50% by weight of the melt with respect to the polymer, A) Fibrous filler A, B) Particulate filler B not containing graphite, And mixtures thereof, A method for producing a foamed web or a foamed sheet comprising a filler selected from the group consisting of: |