Basell Poliolefine Italia S.r.l.

Camillo Cagnani

Claudio Cavalieri

Enrico Beccarini

Paola Massari

Roberto De Palo

Roberta Marzolla

Alessandro Guidicini

Cees Besems

Piet Roose

Cees Besem

The present invention relates to a process for producing a propylene terpolymer comprising comonomer units derived from ethylene and from one alpha-olefin selected from the group of C-Calpha-olefins and being characterized by a total content of comonomer units not less than 8% wt and a value of the ratio of ethylene to the C-Calpha-olefins ranging from 0.1 to 0.8, said process being carried out in a gas-phase reactor comprising two interconnected polymerization zones. The present invention further relates to the propylene terpolymer obtained by said process particularly suitable to be used as films such as cast films, bi- or mono-oriented films and heat-sealable films having good optical properties and excellent sealing properties combined with good shrinkage properties and softness.

Process for producing propylene terpolymers

Propylene homopolymers or copolymers containing up to 5.0 wt % of alpha-olefin units having from 2 to 8 carbon atoms other than propylene, characterized in that said propylene homopolymers or copolymers have Polydispersity Index value higher than 15, Melt Strength higher than 1.50 cN at 230&#xb0; C. and Melt Flow Rate (ISO1133, 230&#xb0; C./2.16 Kg) from 0.01 to 20 g/10 min.

Propylene polymers having broad molecular weight distribution

Propylene polymers having specific values of total comonomer content and melting temperature, articles obtained therefrom, in particular extrusion blow molded articles, and gas-phase process for obtaining said propylene polymers.

Propylene polymers

A propylene polymer composition having a Flexural modulus lower than 500 MPa, a total ethylene content from 9 to 30% by weight, a xylene soluble fraction at room temperature higher than 25% by weight, a melting temperature measured by DSC (Tm&#xb0; C.) from 130 to 150&#xb0; C. and a ratio between the weight of xylene soluble fraction at 25&#xb0; C. and the hexane soluble fraction determined on plaque (100 &#x3bc;m) of higher than 4.

Soft propylene polymer compositions

A process for the preparation of a propylene copolymer composition having a Flexural modulus lower than 500 MPa, a total ethylene content higher than 9% and a Xylene soluble fraction at room temperature higher than 20% comprising at least one polymerization step carried out in a gas-phase polymerization reactor comprising at least two interconnected polymerization zones said process being characterized by the fact that at least 30% by weight of said xylene soluble fraction is produced in the polymerization step carried out in a gas-phase polymerization reactor comprising at least two interconnected polymerization zones.

Process for the preparation of soft propylene polymer compositions

A propylene polymer composition comprising (weight percentages being referred to the sum of A+B): (A) 75-95% by weight of a copolymer of propylene comprising from 0.5 to 3.0 mole % of comonomer units derived from ethylene and/or C4-C8 alpha-olefins; and (B) 5-25% by weight of a copolymer of propylene comprising from 25 to 45 mole % of ethylene units, said propylene polymer composition having a melt flow rate value according to ISO 1133 (230&#xb0; C., 2.16 Kg) of from 20 to 40 g/10 min.

Propylene polymer composition for injection molding

Articles, in particular non-pressure mono- or multi-layer pipes, prepared by extrusion, molding and combination thereof, comprising a heterophasic polyolefin composition comprising (1) 65-95% of a crystalline propylene polymer insoluble in xylene at ambient temperature in an amount over 85% and having a polydispersity index ranging from 4 to 13 and an intrinsic viscosity value ([&#x3b7;]) of over 2.2 dl/g, and (2) 5-35% of an elastomeric olefin polymer of ethylene with a C-C&#x3b1;-olefin having an ethylene content ranging from 15 to 85% and an intrinsic viscosity value ([&#x3b7;]) of at least 1.4 g/ml. The [&#x3b7;]/[&#x3b7;]ratio ranging from 0.45 to 1.6. The articles typically have modulus of elasticity in tension higher than 2000 MPa. The invention also relates to the said heterophasic polyolefin composition and an extrusion process for producing the said articles.

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Ferrara, Italy

Camillo Cagnani