Hoechst Aktiengesellschaft Ag

Bernd Mucha

Manfred Kuechler

Modified bitumens, processes for their preparation, their use and solubilizing agents for plasticized polyvinyl butyral in bitumen. Preparation of modified bitumens having improved elasticity properties and an improved low-temperature flexibility by homogeneous mixing of plasticized polyvinyl butyral (PVB) into molten bitumen at 150.degree. to 300.degree. C., simultaneously using mono-, oligo- or polyalkylene glycol dialkyl ethers as solubilizing agents, if appropriate in combination with polystyrene as solubilizing co-component. Process for the preparation of the modified bitumens and possible uses thereof in industrial fields in which bitumens elasticized by conventional methods have hitherto been employed or required.

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Neu-Anspach, Germany

Bernd Mucha