Process for producing a steam-sterilizable porous polyolefin mem

Details Process for producing a steam-sterilizable porous polyolefin mem Process for producing a steam-sterilizable porous polyolefin mem

1996-06-05

1998-12-01

Wu, David W.

Plastic and nonmetallic article shaping or treating: processes

Disparate treatment of article subsequent to working,...

Effecting temperature change

264235, 2642358, 5263481, 526352, B29C 7102

Patent

active

058433589

ABSTRACT:
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.degree. C.

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