Wolff Walsrode Ag

Wolfgang Ermert

Rudi Klein

Hans-Werner Funk

Hans-Egon Schieder

Hans W Funk

Process for the preparation of translucent matt polyurethane films with a rough surface by extrusion of thermoplastic polyurethane elastomers to flat films or tubular films, characterized in that the extruded film is stored until it has a turbidity of &gt; 15%, measured in accordance with ASTM D 1003, and the two film surfaces are then embossed with the aid of embossing rolls with a different number of grids, each in the range from 20 to 100 grids/cm.sup.2, under a pressure of 5 to 20 bar at temperatures of 130.degree. to 175.degree. C.

Process for the preparation of polyurethane films for blood or infusion

Process for the production of elastic tapes from thermoplastic polyurethane elastomers, wherein the thermoplastic is extruded to form a flat or tubular film and is slit in the usual manner, the extruded film being oriented lengthwise at least in the ratio of 1:1.5, cooled and stored until the modulus of elasticity has increased by at least 25%, measured according to DIN 53,455, before the film is slit, and the use of these tapes for the production of elastic seals.

Process for the production of elastic tapes from polyurethane

The invention relates to composite packing films shrinkable by deep drawing and consisting of at least one copolyamide layer containing at least 50% by weight of .epsilon.-caprolactam units and at least one heat-sealable layer, and optionally, an adhesion-promoting layer.

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Fallingbostel, Germany

Wolfgang Ermert