Hoechst Aktiengesellschaft

Walter Albert

Ulrich Schulte

Gunter Kohaut

Manfred Dicks

Wolfgang Mylich

Herbert Borchert

Hans O Schiedrum

Bruno Rapp

The invention provides foamed plastics particles having a star-like shape the three legs of which are on the same plane. The ratio of particle thickness to particle height is from 1:2.75 to 1:3.3, that of leg width to particle height is from 1:2.2 to 1:2.5, and the particle height is from 10 to 60 mm. The particles of the invention are suitable as free-flowing packing material having a good flow and simultaneously a good interlocking capacity.

Free-flowing packing material of foamed plastics particles

The flameproof styrene polymer foam in accordance with this invention is obtained by melting a granular mixture of styrene polymer and aluminum hydroxide having a grain size of 20-100 .mu.m and a specific surface of below 1 m.sup.2 /g in an extruder, incorporating a physical expanding agent, and homogenizing and extruding the mixture.

Flameproof polystyrene foam and process for the manufacture thereof

To produce hollow articles of a thermoplastic by extrusion blowing a parison is transferred from the extruder die into the blow mold by means of a gripper device comprising two gripper arms which work hand-over-hand, alternatively grip the parison as it issues from the die and draw it at an adjustable take-off speed, which is greater than the speed of extrusion, into a blow mold waiting under the die, and the blow mold, after the gripper arm has passed the lower edge of the mold, closes about the parison still hanging from the die, the second gripper arm grips the parison just above the blow mold before the parison is severed between the upper edge of the mold and the gripper arm, the filled blow mold makes room for the next blow mold, the parison inserted in the mold is inflated in a manner which is in itself known to form the hollow body, the latter is released from the mold, and the entire sequence is repeated as a continuous set of cycles.

Process for extrusion blowing of thermoplastic hollow articles and

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Frankfurt am Main, Germany

Walter Albert