Ineos Manufacturing Belgium Nv

Thomas F Ameye

Dominique Jan

Andre Frederich

Fabian Siberdt

A composition suitable for use in pressure pipes and pipe fittings is disclosed comprising polymer of ethylene and from 0.5 to 5 wt % of a C-Calpha-olefin which has a natural density of 935-956 kg/m, a melt index MIof 0.15-0.5 g/10 min, a dynamic complex viscosity at 100 rad/s and 190&#xb0; C. (&#x3b7;) of no more than 2500 Pa&#xb7;s, a relationship between &#x3b7;and dynamic complex viscosity measured in Pa&#xb7;s at 0.01 rad/s and 190&#xb0; C. (&#x3b7;) defined by the equation &#x3b7;&#x3e;115000+30. &#x3b7;, and an environmental stress crack resistance as measured by a notched pipe test performed according to ISO13479:1997 on 110 mm SDR 11 pipes at 80&#xb0; C. and a pressure of 9.2 bar, of greater than 1000 hours, or: wherein the C-Calpha-olefin is 1-hexene or 1-octene.

Ethylene polymer composition

Process for making a film or pipe by compounding an uncompounded polyolefin powder having a particle size distribution such that D95 is less than 355 &#x3bc;m and (D90&#x2212;D10)/D50 is less than 1.2, where D95, D90, D50 and D10 are defined such that 95 wt %, 90 wt %, 50 wt % or 10 wtl % of the polymer particles have a diameter of less than D95, D90, D50 and D10 respectively, to form pellets; and then forming the pellets into a film or pipe.

Polyolefin powder

Uncompounded polyolefin powder which is multimodal and has a particle size distribution such that D95 is less than 355 &#x3bc;m, D5 is at least 60 &#x3bc;m, and (D90&#x2212;D10)/D50 is less than 1.2, where D95, D90, D50 and D10 are defined such that 95 wt %, 90 wt %, 50 wt % and 10 wt % of the polymer particles have a diameter of less than D95, D90, D50 and D10 respectively.

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Grimbergen, Belgium

Thomas F Ameye