Porous polyimide material and a method for producing the same

摘要

A porous material made of a dry gel of a polyimide resin having an apparent density of 800 kg/m<3> or less and a mean pore size of 1 pm or less is disclosed. The porous material exhibits high heat resistance and is low in density and mean pore size. The use of the porous material provided by the present invention can produce not only a heat insulator with a low thermal conductivity and high heat insulation but also an insulating material having a low dielectric constant and exhibiting excellent dielectric characteristics at high frequencies. The present invention can also provide a semiconductor circuit including the insulating material.