Borealis Ag

Jenni Valonen

Marja Mustonen

Henry Sleijster

Eero Partanen

Richard Havenaar

Jussi Laurell

The present invention relates to a method for transporting polyolefin particles in a polymer conveying system, comprising the steps of a) Subjecting the polyolefin particles to moist conveying gas to produce wetted polyolefin particles; b) Transporting the wetted polyolefin particles through at least one conveying line; and c) Controlling the amount of moisture in the conveying gas of the polymer conveying system as such that at the end point of the at least one conveying line the relative humidity of the conveying gas (RH) is 40% to 100%, the use of said method in an in-plant polymer conveying system, the use of said method for improving dust and/or angel hair removal in polymer conveying systems and the use of said method for increasing conveying capacity of polyolefin particles with a density of from less than 850 to 910 kg/m.

Method for transporting polyolefin particles in a polymer conveying system

Process for the preparation of a solid olefin polymerization catalyst system, comprising an organometallic compound of a transition metal of Group 3 to 10 of the Periodic Table (IUPAC 2007) in the form of solid particles comprising the steps of I) generating an emulsion by dispersing a liquid clathrate in a solvent (S) wherein (i) the solvent (S) constitutes the continuous phase of the emulsion and comprises a nonreactive fluorinated synthetic oil having a viscosity at 20&#xb0; C. according to ASTM D445 of at least 10 cSt up to 2000 cSt (ii) the liquid clathrate constitutes in form of droplets the dispersed phase of the emulsion, II) solidifying said dispersed phase to convert said droplets to solid particles and III) optionally recovering said particles to obtain said catalyst system, wherein the liquid clathrate comprises (a) a lattice being the reaction product of a1) a transition metal compound of formula (I) LRTXwherein 'T' is a transition metal of anyone of the groups 3 to 10 of the periodic table (IUPAC2007), preferably a transition metal of anyone of the groups 4 to 6 of the periodic table (IUPAC2007), more preferably titanium (Ti), zirconium (Zr) or hafnium (Hf), i.e. zirconium (Zr) or hafnium (Hf), each 'X' is independently a monovalent s-ligand, each &#x201c;L&#x201d; is independently an organic ligand which coordinates to the transition metal (T), &#x201c;R&#x201d; is a bridging group linking said organic ligands (L), &#x201c;m&#x201d; is 2 or 3, preferably 2, &#x201c;n&#x201d; is 0, 1 or 2, preferably 1, &#x201c;q&#x201d; is 1, 2 or 3, preferably 2, m+q is equal to the valency of the transition metal (T), a2) a cocatalyst comprising aluminoxane a3) a compound being effective to form the lattice with the transition metal compound and/or the aluminoxane and b) a hydrocarbon solvent (HS).

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Kerava, Finland

Jenni Valonen