Dsm IP Assets B.v.

Boreskov Institute of Catalysis

Timothy James Kidd

Romain Berthoud

John Richard Severn

Johannes Hendrikus Marie Heijnen

Martin Pieter Vlasblom

Harold Jan Smelt

Jorn Boesten

Piotr Matloka

Jan Stolk

Vladimir Aleksandrovich Zakharov

Tatiana Borisovna Mikenas

Valentin Evgenyevich Nikitin

Victor Fidel Quiroga Norambuena

Filip Frederix

Particulate ultra high molecular weight polyethylene (pUHMWPE) are disclosed having an intrinsic viscosity (IV) of at least 4 dl/g, a molecular weight distribution M/Mof less than 4.0, a median particle size D50 of between 50 and 200 &#x3bc;m, a residual Ti-content of less than 10 ppm, a residual Si-content of less than 50 ppm, and a total ash content of less than 1000 ppm.

Preparation of ultra high molecular weight polyethylene

The invention relates to a process for the preparation of a particulate ultra high molecular weight polyethylene (pUHMWPE copolymer, comprising the steps of preparing a magnesium containing carrier, loading the carrier with a organometallic compound forming a supported catalyst and contacting the supported catalyst with ethylene and at least one olefinic co-monomer under polymerization conditions, wherein the organometallic compound is of the formula RP&#x2550;N&#x2014;TiCpX.

Preparation of ultra high molecular weight ethylene copolymer

The invention relates to a process for the preparation of a particulate ultra high molecular weight polyethylene (UH-MWPE), comprising the steps of preparing a magnesium containing carrier, loading the carrier with a organometallic compound forming a supported catalyst and contacting the supported catalyst with at least ethylene under polymerization conditions, wherein the organometallic compound is of the formula RP&#x2550;N&#x2014;TiCpX.

The invention relates to a creep-optimized ultrahigh molecular weight polyethylene (UHMWPE) fiber obtained by spinning an UHMWPE comprising olefinic branches (OB) and having an elongational stress (ES), and a ratio (OB/1000 C/ES) between the number of olefinic branches per thousand carbon atoms (OB/1000 C) and the elongational stress (ES) of at least 0.2, wherein said UHMWPE fiber when subjected to a load of 600 MPa at a temperature of 70&#xb0; C., has a creep lifetime of at least 90 hours.

Creep-optimized UHMWPE fiber

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Echt, Netherlands

Timothy James Kidd