The bonding model of pressure sensitive adhesives (PSAs) was used in the search for new tackifying materials which show superior peroxide compatibility compared to commercially available resins. As future developments, e. g. in belts, are directed towards higher temperature resistance combined with good dynamic properties, the request for new systems is often directed towards the chemists. Sulfur systems, which were predominantly used in the past, are becoming more and more obsolete. How to increase building tack, however, is a question that still remains to be solved. New polymeric tackifiers based on Levapren (R) VP KA 8896 were therefore designed using the bonding model first described by Chang [1]. This polymer shows excellent peroxide compatibility with superior tack efficiency compared to the C5 naphtha stream derived resin described in the last chapter.