Borealis Technology Oy

Borealis A/s

Amir K Karbasi

Bo Malm

Pirjo Jaaskel&auml;inen

Ali Harlin

Esa Korhonen

P&auml;ivi Pitk&auml;nen

John Haugen

Nina Manner

Pauli Leskinen

Klaus Nyfors

Pirjo Jääskeläinen

Fred Bergmann

Karin H Knudsen

Mika H&auml;rk&ouml;nen

Kai Hagane

Päivi Huovinen

P&auml;ivi Huovinen

Christer Lind

Michiel Bergstra

Ensio Hietanen

The invention is directed to a process for the treatment of plastic material comprising a) providing a liquid; b) contacting the plastic material with the liquid; c) keeping the plastic material in the liquid at Tb&#x2212;25&#xb0; C. to Tb of the liquid, wherein Tb is the boiling point of the liquid at the applied pressure; and d) removing the plastic material from the liquid. Furthermore, the invention is directed to the use of a liquid for the treatment of plastic material and to a plant for treating plastic material with a liquid.

Removing volatile compounds from polymer pellets

A process for producing polyolefins, which includes polymerizing at least one olefin monomer, separating at least a part of the reaction mixture, dividing the separated reaction mixture into a polymer-lean fraction and a polymer-rich fraction, and subjecting at least a part of the polymer-lean fraction to a purification step prior to recycling back to the polymerization of at least one olefin monomer. The obtained polyolefins particularly have a low content of volatile low molecular weight compounds, a low content of low-molecular weight polyolefin waxes and a low content of residues derived from the catalyst employed.

Process to reduce polyolefins with extra low impurity content

The present invention concerns a high melt strength propylene polymer or copolymer suitable for manufacturing foams and thermoformed product exhibiting a melt strength of at least 3 g and comprising a high molar mass portion and a low or medium molar mass portion. The polymers are produced by subjecting propylene and optionally other olefins to polymerization in a plurality of polymerization reactors connected in series, employing different amounts of hydrogen as a molar mass modifier in at least two of the reactors, and carrying out the polymerization reaction in the presence of a catalyst system capable of catalyzing the formation of a high molar mass polymerization product having a MFRof less than 0.1 g/10 min and a low or medium molar mass polymerization product having a MFRof more than 0.5 g/10 min.

High melt strength polypropylene

The present invention concerns a high melt strength propylene polymer or copolymer suitable for manufacturing foams and thermoformed product exhibiting a melt strength of at least 3 g and comprising a high molar mass portion and a low or medium molar mass portion. The polymers are produced by subjecting propylene and optionally other olefins to polymerization in a plurality of polymerization reactors connected in series, employing different amounts of hydrogen as a molar mass modifier in at least two of the reactors, and carrying out the polymerization reaction in the presence of a catalyst system capable of catalyzing the formation of a high molar mass polymerization product having a MFRof less than 0.1 g/l0 min and a low or medium molar mass polymerization product having a MFRof more than 0.5 g/10 min.

The present invention concerns nucleated propylene polymers having a xylene soluble fraction at 23&deg; C. of less than 2.5%, a crystallization temperature of over 124 &deg; C. and a tensile modulus of greater than 2,000 MPa. These polymers can be prepared by nucleating a propylene polymer with a polymeric nucleating agent containing vinyl compound units, and by polymerizing propylene optionally with comonomers in the presence of a Ziegler-Natta catalyst system primarily transesterified with a phthalic acid ester&mdash;a lower alcohol pair to provide said propylene polymer. The catalyst contains a strongly coordinating external donor.

Propylene polymers and products thereof

The present invention concerns a process for producing a propylene polymer nucleated with a polymeric nucleating agent containing vinyl compound units. The method comprises modifying a catalyst by polymerizing a vinyl compound in the presence of said catalyst in a medium, which does not essentially dissolve the polymerized vinyl compound, and by continuing the polymerization of the vinyl compound until the concentration of unreacted vinyl compounds is less than about 0.5 wt-%. The thus obtained modified catalyst composition is used for polymerizing propylene optionally together with comonomers to produce in the presence of said modified catalyst composition. Modification of the catalyst according to the present invention will reduce production costs and provide highly reliable catalyst activity.

Process for preparing polypropylene

The invention relates to a copolymer composition prepared from copolymers of propene and &agr;-olefin having 2 to 12 carbon atoms, having high molecular weight, a broad molecular weight distribution and an improved comonomer distribution. The invention relates also to a process for producing the composition and the use of the composition in pipes, fittings, profiles, films and foams. The composition is a so-called reactor mixture of copolymers of said monomers comprising a first copolymer having a higher molecular weight, an &agr;-olefin content of 3 to 10 wt. % and a melt flow rate MFR,of 0,005 to 0,8, and a second copolymer having a lower molecular weight, thus the final composition has a comonomer content of 2 to 10 wt. %, a melt flow rate MFR,of 0,05 to 2,5 wt. %, a melt flow ratio MFR,/MFR,of 6 to 15, and the split of the copolymers in the composition between the higher molecular weight copolymer and the lower molecular weight copolymer is from 40/60 to 70/30.

Polypropylene composition with broad MWD

Process and catalyst component for homo- and copolymerization of olefins

Growing community of inventors

Espoo, Finland

Amir K Karbasi