Total Research & Technology Feluy

Total Petrochemicals Research Feluy

Centre National De La Recherche Scientifique

David Ribour

Roger Spitz

Alain Standaert

Jerome Gromada

Aurélien Vantomme

Daniel Siraux

Christophe Boisson

Olivier Lhost

Armelle Sigwald

Ludovic Horion

Described herein are caps or closures made from a resin composition having at least one polyethylene having a density of at leastg/cmwhen measured following the ISO-method at&#xb0; C.; erucamide; and at leastppm based on the total weight of the resin composition of at least one ultraviolet absorber selected from the hydroxyphenylbenzotriazole class. A process for the production of such caps or closures is also described herein.

Caps or closures made from a resin composition comprising polyethylene

The present invention relates to a polyethylene resin suitable for preparing moulded articles, such as caps and closures. The invention provides in particular a polyethylene resin comprising at least two polyethylene fractions A and B, wherein said polyethylene resin has a melt index (MI2), of at least 3.0 g/10 min to at most 5.5 g/10 min as measured according to ISO 1133, condition D, at 190&#xb0; C. and under a load of 2.16 kg, and a density of at least 0.955 g/cmto at most 0.965 g/cmas measured according to ISO 1183 at 23&#xb0; C., and a molecular weight distribution M/Mwhich is at most 7.0, as determined by gel permeation chromatography, with Mbeing the weight-average molecular weight and Mbeing the number-average molecular weight; and wherein said polyethylene fraction A has a high load melt index (HLMI), as measured according to ISO 1133:1997 condition G at 190&#xb0; C. and under a load of 21.6 kg, of at least 10.5 and a melt index (MI2) of at least 0.5 g/10 min to at most 1.5 g/10 min as measured according to ISO 1133, condition D, at 190&#xb0; C. and under a load of 2.16 kg. The invention further relates to a process for preparing said polyethylene resin, to a cap or closure comprising said polyethylene, and to a process for producing such a cap or closure.

Polyethylene resin and caps or closures made therefrom

A high-density polyethylene (HDPE) can be adapted for the manufacture of caps and closures. The caps and closures can be used as screw-on caps for carbonated or still drinks. The high-density polyethylene can have a density of at least 940 kg/mand of at most 970 kg/m, and a high load melt index HLMI of at least 35 dg/min and of at most 180 dg/min. The high-density polyethylene can include a first polyethylene fraction and a second polyethylene fraction. The first polyethylene fraction can have a density of at least 920 kg/mand of at most 945 kg/m, and a melt index HL275 of at least 3 dg/min and of at most 12 dg/min. The second polyethylene fraction can have a density of at least 960 kg/mand of at most 980 kg/m.

High-density polyethylene for caps and closures

The present invention provides a method for improving and controlling the activity of Ziegler-Natta catalyst systems.

Controlled distribution of active sites in ziegler-natta catalyst systems

This invention relates to an improved method for improving the tacticity of Ziegler-Natta catalyst systems and for controlling the behaviour of the active stereospecific sites.

Growing community of inventors

Mons, Belgium

David Ribour