Bayer Aktiengesellschaft

Bela Von Falkai

Walter Simm

Claus Gosling

Richard Bonart

Ulrich Reinehr

Armin Kohler

Klaus Offermann

Horst Wilschinsky

Dry-spun hydrophilic core-jacket filaments and fibres of polycarbonates having a porosity and a water retention capacity of at least 10%, a mercury density of less than 1.0 g/cc, a strength of at least 1.5 cN/dtex and a second order transition temperature of at least 125.degree. C. and a method for producing said filament and fibres by a dry-spinning process, wherein, immediately on leaving the spinnerette but before solidifying, the filaments are brought into contact with steam.

Hydrophilic filaments and fibres of polycarbonates with a high second

In a process for the production of fibre filters, the fibre material is sprayed electrostatically from the liquid state and deposited as a fibre fleece on a conductive support. The starting materials used are solutions of high polymers in readily volatile solvents. The filters obtained have substantially improved properties.

Fibre fleece of electrostatically spun fibres and methods of making same

In a process for the production of fibre filters, the fibre material is sprayed electrostatically from the liquid state and deposited as a fibre fleece on a conductive support. The starting materials used are solutions of high polymers in readily volatile solvents. The charged filters obtained have substantially improved properties.

Filter made of electrostatically spun fibres

The invention is related to a process for the production of improved, low shrinkage, highly oriented polyester threads which comprises melt spinning a polyester thread, stretching said thread in hot water and shrinking said thread from 3 to 22 % in hot air at temperatures of from 5.degree. to 40.degree. C below the melting point of the polyester over a period of from 3 to 30 seconds. The improved service properties of monofilaments produced in this way are reflected in an increase in the ultimate tensile strength coupled with an increase in elongation, in a shrinkage of less than 1% on boiling, in a heat-included shrinkage of at most 10% at a temperature of 195.degree. C (exposed for 30 minutes in air) and in a very high 2nd moment.

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Munich, Georgia

Bela Von Falkai