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Injection Molding Guide - LyondellBasell

A Guide toPolyolefin Injection Molding1A Guide to Polyolefin Injection MoldingTable of ContentsIntroduction .. 2 Polyolefins are derived from petrochemicals .. 2 Molecular structure and composition affect properties and processability .. 2 Chain branching .. 3 density .. 3 Molecular weight .. 4 Molecular weight distribution .. 4 Copolymers .. 5 Modifiers and additives .. 5 Working closely with molders .. 5 How polyolefins are made .. 5 Low density polyethylene (LDPE) .. 6 High density polyethylene (HDPE) .. 6 linear low density polyethylene (LLDPE) .. 7 Polypropylene .. 7 Shipping and handling polyolefin resins .. 7 Material handling.

linear, as in high density polyethylene, or highly branched as in low density polyethylene. For every 100-ethylene units in the polyethylene molecular chain, there can be one to ten short or long branches that radiate three-dimensionally (Figure 1). The degree and type of branching are controlled by the process (reactor), catalyst, and/or any ...

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