Process for producing a steamsterilisable porous polyolefin membrane, and polyethylene membrane steam-sterilisable at 134 C.

摘要

Process for producing a steam-sterilizable porous polyolefin membrane with a porosity of at least 20% and a shrinkage of 4% at most in every direction in the plane of the membrane in steam sterilization by subjecting a porous stretched film to a shrink treatment at a temperature equalling at least the sterilization temperature, but below the melting point of the polyolefin, in which treatment the permitted shrinkage is at least 95% of the critical shrink factor of the film in every direction in the plane of the film and a membrane of polyethylene with an intrinsic viscosity of at least 5 dl/g, steam-sterilizable at 134 DEG C.