Himont Incorporated

Basell Poliolefine Italia S.r.l.

Montell North America Inc.

Basell Polyolefine Gmbh

Antonio Ciarrocchi

Anteo Pelliconi

Gabriele Govoni

Mario Sacchetti

Giuliano Cecchin

Paolo Ferrari

Gerhardus Meier

Paola Massari

Giampaolo Pellegatti

Gabriele Mei

Massimo Covezzi

Ulf Schueller

Giuseppe Penzo

Antonio De Lucia

Massimo Covessi

A process for polymerizing olefins at temperatures of from 30&#xb0; C. to 140&#xb0; C. and pressures of from 1.0 MPa to 10 MPa in the presence of a polymerization catalyst in a multistage polymerization of olefins in at least two serially connected gas-phase polymerization reactors, and apparatus for the multistage polymerization of olefins, comprising at least two serially connected gas-phase polymerization reactors and a device for transferring polyolefin particles from an up-stream gas-phase polymerization reactor to a downstream gas-phase polymerization reactor, the transferring device comprising&#x2014;a gas/solid separation chamber placed downstream of the upstream gas-phase polymerization which gas/solid separation chamber is equipped at a lower part with an net for introducing a fluid, and&#x2014;connected to the gas/solid separation chamber at least two lock hoppers, placed in a parallel arrangement, each connected to the downstream gas-phase polymerization reactor.

Multistage process for the polymerization of olefins

Crystalline polymers and copolymers of propylene having total MIL values&#x3e;2 g/10 minutes, total [&#x3b7;] values in tetrahydronaphthalene at 135&#xb0; C.&#x2266;2.8 dl/g, mW/MN values&#x3e;20, a fraction insoluble in xylene at 25&#xb0; C.&#x2267;94, and including from 10 to 60% by weight of a fraction (A) having [&#x3b7;]&#x2267;2.6, are prepared by way of sequential polymerization in at least two stages, in the presence of a particular Ziegler-Natta catalysts supported on magnesium halides. These polymers have high melt strength, high mechanical properties, and are particularly adequate for the manufacture of articles by using various conversion technologies, such as for example extrusion in thin sheets to be subjected to thermoforming, as well as for injection molding, and blow molding.

Crystalline polymers of propylene having improved processability in the molten state and process for their preparation

Crystalline polymers and copolymers of propylene having total MIL values&#x3e;2 g/10 minutes, total [&#x3b7;] values in tetrahydronaphthalene at 135&#xb0; C.&#x2266;2/8 dl/g, Mw/Mn values&#x3e;20, a fraction insoluble in xylene at 25&#xb0; C.&#x2267;94, and including from 10 to 60% by weight of a fraction (A) having [&#x3b7;]&#x2267;2.6, are prepared by way of sequential polymerization in at least two stages, in the presence of particular Ziegler-Natta catalysts supported on magnesium halides. These polymers have high melt strength, high mechanical properties, and are particularly adequate for the manufacture of articles by using various conversion technologies, such as for example extrusion in thin sheets to be subjected to thermoforming, as well as for injection molding, and blow molding.

Disclosed is a polymer composition containing:

Polypropylene compositions having good transparency and improved impact

Disclosed are polyolefin compositionshaving high balance of stiffness and impact strength, which comprise (percentage by weight):

Polyolefin compositions having high balance of stiffness and impact

Discosed are compositions of crystalline propylene polymers comprising (by weight):

Compositions of crystalline propylene polymers having a low seal

Crystalline polymers and copolymers of propylene in the form of spherical particles having a porosity (expressed in percentage of voids) greater than 15%. These polymers are useful in the preparation of masterbatch containing significant quantities of additives and/or pigments.

Crystalline propylene polymers and copolymers in the form of spherical

Crystalline olefin polymers and copolymers in the form of spherical particles having porosity (expressed in percentage of voids) higher than 15%, with more than 90% of the pores having a pore diameter greater than one micron. These polymeric particulate materials find many applications, including, e.g., the preparation of masterbatches containing significant quantities of additives and/or pigments.

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Ferrara, Italy

Antonio Ciarrocchi