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To improve the bubble stability of Linear Low Density PolyEhtylene (LLDPE) in blown film, it is common to blend in long chain branched Low Density PolyEthylene (LDPE). For Ziegler Natta (ZN) catalyzed LLDPE typical LDPE levels range from 10% to 30%. With the introduction of single site catalyzed LLDPE produced in dual reactor mode (sLLDPE), blend strategies have been revisited. It appears that addition of 10% or less LDPE to sLLDPE results in high performance films with superior bubble stability. The good compatibility of sLLDPE with LDPE results in a great advantage for film converters in the form of a new tool to design films, based on the selection of the LDPE blend partner. It is demonstrated how film properties of sLLDPE/LDPE blends can be fine-tuned by varying the type of LDPE and the amount added.
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Processability and Film Performance of Single Sites LLDPE/LDPE Blends, 2005 European PLACE Conferenc