The discovery of new catalytic systems based on metallocenes began a new era in polyolefins technology. Metallocene-based catalysts in comparison with conventional Ziegler-Natta systems offer higher versatility and flexibility for both the synthesis and the control of the structures of polyolefins. High density polyethylene (HDPE), polypropylene (atatic, isotactic, syndiotactic etc.), polystyrene, ethylene-propylene-diene terpolymers (EPDM) are among the most remarkable products obtained. In rotational moulding, for example, metallocene PE grades promise a broader processing window, shorter cycle times, improved flow properties and potentially better warpage control. The metallocene market in 2000 has been estimated to be 6 million tons. To develop a sound market it is important for users to understand what advantages metallocene products will bring to them as well as any technological difficulties still to be overcome.
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