Bayer Aktiengesellschaft

Karl Heinz Muller

Frank Gerald Kleiner

Wolfgang Becker

The invention relates to an apparatus for the continuous production of continuous plastics foam webs from extruded polyolefin webs containing peroxide and blowing agent by cross-linking on a perforated conveyor belt with subsequent foaming, suspended freely in space into a continuous heating furnace.

Apparatus for the continuous production of continuous plastics foam webs

A process for the production of a fine-celled foam from a mixture of a polyolefin, a peroxide capable of peroxidically cross-linking the polyolefin and a principal blowing agent having a decomposition point or decomposition range above about 190.degree.C, wherein a further blowing agent, an auxiliary blowing agent, having a decomposition range of from 130.degree. to about 190.degree.C is added in a quantity of from 0.1 to 1.5 percent by weight, based on said principal blowing agent, to said mixture, the mixture thus obtained is worked up under such conditions that neither cross-linking nor appreciable foaming takes place to a moulding, which is subsequently, cross-linked and foamed by heating to temperatures above 190.degree.C.

Process for the production of fine-cell polyolefin foams

A process for the continuous production of a foamed foil from a polymer based on an .alpha.,.beta.-monolefinically unsaturated monomer wherein 0.05 to 0.2 % by weight of a diamide obtained by reacting an aliphatic diamine and at least one aliphatic monocarboxylic acid having at least 4 carbon atoms is added to the solid or molten polymer in addition to the chemical blowing agent before or while the polymer is processed.

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Quadrath-Ichendorf, Germany

Karl Heinz Muller