use of high polyaethylenterephthalat and polymers for spritzgussmassen from olefins

摘要

High impact injection mouldings are made from a composition of (a) polyethylene terephthalate and (b) from 0.5 to 50% by weight of the composition of polyethylene, preferably of specific gravity 0.915 to 0.930. The dimensional stability of the mouldings is improved by incorporating 1.0 to 5% by weight of polypropylene or poly-4-methylpentene into the moulding compositions. The polyolefin may be added during the preparation of the polyethylene terephthalate or the polymers may be mixed in powder or granular form. The granules or powders may be fused in an extruder and the homogenized melt either directly injection-moulded or reconverted into granular form.