Basell Polyolefine Gmbh

Albert Weber

Joachim Berthold

Gerhardus Meier

Heinz Vogt

James Stern

Diana (nee Boos) Doetsch

Diana Boos

The invention relates to a polyethylene molding composition which has a multimodal molecular mass distribution and comprises a low molecular weight ethylene homopolymer A, a high molecular weight ethylene copolymer B and an ultrahigh molecular weight ethylene copolymer C. The molding composition has a density at a temperature of 23&#xb0; C. in the range from 0.940 to 0.957 g/cm, an MFR (190&#xb0; C./2.16 kg) in the range from 0.5 to 4 dg/min and a viscosity number VNof the mixture of ethylene homopolymer A, copolymer B and ethylene copolymer C, measured in accordance with ISO/R 1191 in decalin at a temperature of 135&#xb0; C., in the range from 150 to 300 cm/g. The invention further relates to the use of such a molding composition for producing injection-molded finished parts, and to finished parts produced by injection molding.

Polyethylene molding composition for producing injection-molded finished parts

The invention relates to a polyethylene molding composition having a multimodal molecular mass distribution and comprising a first ethylene homopolymer fraction (I), a second ethylene copolymer fraction (II) and a third ethylene copolymer fraction (III). The molding composition has a density at a temperature of 23&#xb0; C. in the range from 0.945 to 0.953 g/cm, an MFR (190&#xb0; C./5 kg) in the range from 2 to 7 g/10 min and a viscosity number VNof the total mix of ethylene homopolymer fraction (I), copolymer fraction (II) and ethylene copolymer fraction (III), measured in accordance with ISO/R 1191 in decalin at a temperature of 135&#xb0; C., in the range from 200 to 250 cm/g. The invention further relates to the use of such a molding composition for producing high-strength injection-molded screw cap closures for bottles comprising beverages, especially carbonated beverages.

PE moulding composition for producing injection-molded screw cap closures and high-strength screw cap closure for carbonated beverages produced therewith

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Cervelló, Spain

Albert Weber