Borealis Technology Oy

John Haugen

Bo Malm

Amir K Karbasi

Pirjo Jaaskel&auml;inen

Markus Gahleitner

Pauli Leskinen

Magnus Palmlöf

Pirjo Jääskeläinen

P&auml;ivi Pitk&auml;nen

Mika H&auml;rk&ouml;nen

Merja Poikela

P&auml;ivi Huovinen

Robert Nigel Hampton

Christer Lind

Pirjo Jaeaeskelaeinen

Nigel Hampton

Magnus Palmloef

Karl-Michael Jaeger

Insulation layer for cables comprising a heterophasic polymer composition having superior mechanical and electrical properties and being environmentally friendly. The heterophasic polymer composition comprises a polymer matrix and dispersed therein a propylene copolymer having a weight average particle size of less than 1 &#x3bc;m.

Cable with thermoplastic insulation

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

Growing community of inventors

Stathelle, Norway

John Haugen