1. Laboratory
of Plastics and Rubber Technology, Budapest University of Technology and Economics, H-1521 Budapest, P.O. Box
91, Hungary
2. Institute
of Materials and Environmental Chemistry, Research Centre for Natural
Sciences, Hungarian Academy of Sciences, H-1519 Budapest, P.O. Box 286, Hungary
3. Clariant Produkte
(Deutschland) GmbH, D-81477 München, Germany