Rohm Gmbh Chemische Fabrik

Roehm Gmbh & Co Kg

Wanzl Gmbh & Co. Kgaa

Andreas Fetzer

Heinz Gross

Michael Meier-Kaiser

Detlef Bumann

Gunther Dickhaut

The invention relates to a polycarbonate composite material which can be thermoplastically shaped and which comprises at least two layers. The invention is characterised in that at least one layer comprises an LOI value of lower than 29 and at least one layer comprises an LOI value of higher than 29. The invention also relates to methods for producing said material, the use of the same and flame-proof polycarbonate moulded parts.

Polycarbonate composite material which can be thermoplastically shaped, methods for the production thereof, use of the same and a flame-proof polycarbonate moulded part

An extruded, smooth finished solid sheet or film of thickness &lt;1 mm is prepared from a thermoplastic plastic having a glass transition temperature &gt;50.degree. C., by extruding the plastic in the thermoplastic state through a slot nozzle to form a flat extruded strip, which is introduced into the roll gap of a roll stack having a smoothed upper roll and a lower roll, with the upper roll being maintained at a temperature below the glass transition temperature of the thermoplastic plastic and with the lower roll being maintained at a temperature in the plastic state domain of the thermoplastic plastic, and, after exiting the roll gap, the extruded strip is moved resting on a smooth-finished endless belt which passes around the lower roll, thereby smoothing the surface of the strip; and cooling said extruded strip below the glass transition temperature.

Method of manufacturing thermoplastic sheet or film

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Bickenbach, Germany

Andreas Fetzer