Basf Aktiengesellschaft

Reinhold Weber

Manfred Weilbacher

Gerhard Alicke

Klaus Hahn

Uwe Guhr

Franz-Josef Dietzen

Ludwig Zuern

Horst Schuch

Bernardo Wolff

Heinz Voelker

Hans D Zettler

Heinz Weber

Hermann Tatzel

Wolfgang Guenther

Klaus Hinselmann

Hartmut Heinen

Manfred Hahn

Alfons J Van Biesen

Julien N Callens

Bernhard Schillinger

Foam boards produced using halogen-free blowing agents

Production of foam boards of high compressive strength from styrene

Foam boards of high compressive strength are produced by extruding a mixture of a styrene polymer and from 5 to 16% by weight of a blowing agent which contains

Production of foam boards of high compressive strength using a blowing

Foam sheets of high compressive strength are produced by extruding a mixture of a styrene polymer and from 5 to 16% by weight of a blowing agent mixture containing

Production of foam sheets of high compressive strength

Foam sheets of high heat distortion resistance contain a) from 80 to 99% by weight of a styrene polymer and b) from 1 to 20% by weight of poly-1,4-phenylene sulfide, and, if desired, conventional additives and are produced by extrusion using a low-boiling blowing agent.

Foam sheets of high heat distortion resistance

Foam sheets of high heat distortion resistance contain a) from 80 to 99% by weight of a styrene polymer and b) from 1 to 20% by weight of poly(2,6-dimethyl-1,4-phenylene oxide), and, if desired, conventional additives and are produced by extrusion using a low-boiling blowing agent.

Foams having high compressive strength are obtained by extrusion of a mixture of a styrene polymer and from 3 to 9% by weight of a blowing agent consisting of from 80 to 100% by weight of CO.sub.2 and from 0 to 20% by weight of one or more halohydrocarbons or hydrocarbons which are gaseous at room temperature, the mixture being extruded into a zone under from 0.1 to 2 bar gage pressure and the foam being allowed to stabilize under this pressure.

Preparation of foams having a high compressive strength

Closed-celled foams of high compressive strength are obtained by extruding a mixture of a styrene polymer and from 8 to 16% by weight of a blowing agent mixture containing from 2 to 20% by weight of ethyl chloride, from 2 to 20% by weight of carbon dioxide, from 20 to 80% by weight of dichlorodifluoromethane and from 10 to 60% by weight of monochlorodifluoromethane.

Production of closed-celled foams of high compressive strength

Fine-celled foams are produced by a process in which a styrene polymer is melted, the melt is mixed with a volatile blowing agent and a nucleating agent under superatmospheric pressure, the mixture is let down to atmospheric pressure, and the foam is cooled. The nucleating agent employed comprises from 0.02 to 2% by weight of the calcium salt of a long-chain fatty acid, and from 0.01 to 1% by weight of a finely divided, inorganic substance which is insoluble in the styrene polymer, a mixture of calcium stearate and magnesium oxide being preferred.

Production of fine-celled foams from styrene polymers

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Mutterstadt, Germany

Reinhold Weber