Process for producing sheet-form sealing material

摘要

A process for producing a sheet-form sealing material which comprises: impregnating a nonwoven fabric with a liquid binder mixture comprising a rubber material or resin and a solvent or dispersion medium, while expelling the gas present in the nonwoven fabric; and heating and compressing the impregnated nonwoven fabric to vulcanize the rubber material or cure the resin. The impregnation is conducted, for example, by a method in which the nonwoven fabric which has been compressed is allowed to spontaneously recover its original shape in the liquid mixture. Alternatively, the impregnation may be conducted by the high-pressure spraying of the liquid mixture or by infiltration at a reduced pressure. Thus, a sheet-form sealing material reduced in strength anisotropy and excellent in gas-barrier properties, etc. is obtained.