1. Transfercenter für Kunststofftechnik GmbH 4600 Wels, Franz‐Fritsch‐Straße 11 Austria
2. Laboratory of Plastics and Rubber Technology, Department of Physical Chemistry and Materials ScienceBudapest University of Technology and Economics H‐1521 Budapest, P.O. Box 91 Hungary
3. Institute of Materials and Environmental Chemistry, Research Centre For Natural SciencesHungarian Academy of Sciences H‐1519 Budapest, P.O. Box 286 Hungary