Low molecular weight (less than ca 10, 000 Mn) polyethylenes [9002-88-41 having wax like properties are made either by high-pressure polymerization or low-pressure (Zeigler-type catalysts) polymerization. All the products have the same basic structure, but the processes yield products h distinctly different properties. Some polyethylenes have fairly low density owing to branching that occurs during the polymerization. Molecular weight distributions, expressed as the weight average molecular weight divided by the number average molecular weight, or polydispersity, also varies widely among the different processes, as does the range of molecular weights available.
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