A Novel Coupling Agent Technology
The results from the development of a novel coupling agent technology are described. The work was particularly focussed on ATH filled EVA systems for wire and cabling applications. After an initial screening of 35 potential coupling agents, 2 were selected for further evaluation on the basis of their ability to increase tensile strength and elongation to break, and to reduce torque during compounding in a Brabender Plasticorder. Low cost, low volatility and low toxicity were also important selection criteria. Brabender Plasticorder results were backed up by twin screw compounding and extrusion studies, leading to the selection of the final candidate, which will be launched commercially. The influences of added peroxide and antioxidant have also been investigated. Finally, a short evaluation has been made of the performance of the candidate coupling agent in calcium carbonate filled EVA and calcium carbonate filled PP homopolymer.