Patent · US Active

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

US8663790B2 · kind B2 · utility

6Cited by

4References

8Claims

0Family size

Assignee

Basell Polyolefine GmbH · DE

Inventors

Joachim Berthold · Prien am Chiemsee, DE
Diana Doetsch · Mainz, DE
Gerhardus Meier · Frankfurt, DE
Albert Weber · Valley City, US

Key dates

Filing date	Dec 13, 2008
Grant date	Mar 4, 2014
Priority date	—
Expiry date	Dec 13, 2028

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08L2205/02
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

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° C. in the range from 0.945 to 0.953 g/cm3, an MFR (190° C./5 kg) in the range from 2 to 7 g/10 min and a viscosity number VN3 of 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° C., in the range from 200 to 250 cm3/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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.