| abstract |
A process is proposed for the manufacture of microporous polyolefine strips or films. The process involves mixing a polyolefine of high molecular weight, an inert hydrophilic filler preferably in the form of finely divided silicic acid and a plasticizer in the form of a mineral oil; plastifying the mixture; forming strips therefrom and extracting the plasticizer. The process is characterized by the fact that the strips are treated with hot water, preferably by being drawn over the surface of a hot water bath, the extraction being effected with the aid of an extraction agent which, in the known way, contains or consists of at least one glycol ether, in particular a butyl glycol. |