Abstract:
A polyolefin composition comprising, in percent by weight: A) 20-35% of a propylene homopolymer or copolymer with up to 8% of comonomer(s); B) 65-80% of a copolymer of ethylene and (i) propylene or (ii) CH2═CHR alpha-olefins, where R is a 2-8 carbon alkyl radical, or (iii) a combination thereof, optionally with minor amounts of a diene, containing from 40 to less than 54% of ethylene; wherein the weight ratio B/XS of the content B of copolymer component (B) to the fraction XS soluble in xylene at room temperature, both referred to the total weight of (A)+(B), is of 1.25 or less.
Abstract:
Injection stretch blow-molding process for preparing polymer containers, comprising the following steps: 1) covering, partially or totally, the outside surface of the core rod of a preform mold with a polymer film; 2) injecting a polymer layer over the covered core rod, thus obtaining a preform comprising an inside polymer film layer and an outside polymer layer; 3) stretch blow-molding the said perform, thus obtaining a container comprising an inside polymer film layer and an outside polymer layer.
Abstract:
Pipe systems having at least one layer comprising a semi-crystalline random polymer of propylene and 0.2 to 5 wt % 1-hexen and optionally a recurring unit selected from ethylene and a C4-C10 α-olefin in an amount from more than 0 to 9% by moles. The polymer exhibits broad molecular weight distribution, in terms of the ratio of weight average molecular weight to numeric average molecular weight formula (I), ranging from 5 to 11, molecular weight distribution of monomodal type and hexen-1 content in the fraction with an intrinsic viscosity of equal to or higher than 3.3 dl/g lower than the hexen-1 content in the fraction with an intrinsic viscosity of less than 3.3 dl/g. ( Mw/ Mn) (I)
Abstract:
A polyolefin composition comprising, in percentage by weight based on the weight sum of the components (a1), (a2) and (b):a1) 16-78% of a propylene homopolymer or copolymer containing at most 15% of ethylene and/or C4-C10 α-olefin(s), having an isotactic index over 80%; anda2) 6-44% of a copolymer of ethylene with one or more C4-C10 α-olefin(s) containing from 10 to 40%, preferably from 15 to 35%, of said C4-C10 α-olefin(s);b) 3-70% of a butene-1 (co)polymer having:a content of butene-1 derived units of 80% wt or more,flexural modulus (MEF) of 60 MPa or less. The polyolefin composition exhibits good impact resistance, excellent whitening resistance and relatively low stiffness combined with good optical properties suitable for injection and blow molding, thermoforming and film application.
Abstract:
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.
Abstract:
Random propylene/ethylene copolymers are provided characterized by Ethylene content in the range of 4.5-7% wt; Mw/Mn (via GPC) in the range 3.5-5.5; Mz/Mw (via GPC) lower than 4; absence of 2-1 regioinversion, and Melting Temperature (Tm) (non-nucleated grade) lower than 143° C. The said copolymers show an excellent balance of impact and optical properties which is retained even after visbreaking.
Abstract:
The present invention relates to catalysts systems for the polymerization of olefins CH2═CHR, wherein R is an alkyl, cycloalkyl or aryl radical having 1-12 carbon atoms, comprising (A) a solid catalyst component comprising Ti, Mg, and halogen (B) an aluminum alkyl compound and (C) a brominated cyclic hydrocarbon. Said catalyst systems have improved polymerization activity.
Abstract:
A 1-butene polymer composition comprising: a) from 10% to 90% by weight of an isotactic 1-butene polymer having the following features: i) isotactic pentad (mmmm) measured by 13C-NMR, higher than 90%; ii) melting point (TmII) higher than 90° C.; and iii) intrinsic viscosity (IV) measured in tetrahydronaphthalene (THN) at 135° C. comprised between 0.5 dl/g and 5.0 dl/g. b) from 90% to 10% by weight of a copolymer of 1-butene and at least a C8-C12 alpha-olefin derived units, containing from 0% to 10% by mole of propylene or pentene derived units, and/or containing from 0% to 5% by mole of ethylene derived units having a content of C8-C12 alpha-olefin derived units higher than 4.0% by mol and lower than 20.0% by mol; endowed with the following features: i) isotactic pentad mmmm higher than or equal to 90%; pentads (mmrr+mrrm) lower than 4 and pentad rmmr not detectable by C NMR. ii) intrinsic viscosity (IV) measured in tetrahydronaphthalene at 135° C. comprised between 0.8 and 5.0 dL/g; iii) the melting point measured by DSC (TmI) and the C8-C12 alpha-olefin content fulfil the following relationship: TmI
Abstract:
A terpolymer of 1-butene, ethylene and a at least a C8-C12 alpha-olefin derived units, containing from 0.1% to 5% by mole of ethylene derived units and from 1 from 20% by mol of C8-C12 alpha-olefin derived units, endowed with the following properties: i) isotactic pentad mmmm higher than or equal to 90%; pentads (mmrr+mrrm) lower than 4 and pentad rmmr not detectable by 13C NMR. ii) intrinsic viscosity (IV) measured in tetrahydronaphthalene at 135° C. comprised between 0.8 and 5.0 dL/g; iii) the melting point measured by DSC (TmI) and the C8-C12 alpha-olefin content fulfil the following relationship: TmI
Abstract:
A process for the multistage polymerization of olefins in a sequence of an upstream slurry reactor and a downstream gas-phase reactor, the transfer of polymer from the upstream reactor to the downstream reactor comprising the following steps: a) heating the slurry of polyolefin particles to evaporate the liquid polymerization medium; b) separating the polyolefin particles from the obtained gaseous phase in at least a separation chamber; c) transferring the polyolefin particles to said downstream reactor by means of a couple of lock hoppers working intermittently in parallel, where one of said lock hoppers is continuously filled with the polymer coming from said separation chamber, while simultaneously the other one is continuously pressurized by means of a gas comprising the reaction mixture coming from said downstream reactor.