1. Corporate Research Chemistry, Henkel KGaA, Henkelstr. 67, D-40191 Düsseldorf, Germany; BGS Beta-Gamma-Service GmbH & Co. KG, John-Deere-Str. 3, D-76646 Bruchsal, Germany; Department of Polymer Engineering, University of Bayreuth, Universitätsstr. 30, D-95447 Bayreuth, Germany; and ITC-CPV, Forschungszentrum Karlsruhe GmbH, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany