Abstract:
Catalyst components for the polymerization of olefins comprising Mg, Ti, halogen and 1,3- diethers as internal donors having an improved balance of properties in terms of activity and morphological stability are obtained by a process comprising: (A) A first step comprising reacting an adduct of formula MgC1 2 (ROH) n , where R is a C1-C10 alkyl group, and n is from 0.5 to 6, with a titanium compound having at least a Ti-C1 bond at a reaction temperature ranging from 0°C to 80°C; (B) A subsequent step comprising contacting the solid product obtained in (A) with an electron donor ED selected from 1,3 diethers with a titanium compound having at least a Ti-C1 bond at a temperature higher than 80°C; and (C) A subsequent step comprising reacting the solid product coming from (B) with a titanium compound having at least a Ti-C1 bond at a temperature higher than 80°C.
Abstract:
The present subject matter relates generally to a controlled nucleated polymer composition comprising: (I) a polyolefin resin; (II) a nucleator; and (III) a nucleation regulator.
Abstract:
A propylene polymer composition comprising (weight percentages being referred to the sum of A+B): A propylene polymer composition comprising (weight percentages being referred to the sum of A+B): (A) 60-90% by weight of a copolymer of propylene with ethylene containing less than 2.5%wt of ethylene units; and (B) 10-40% by weight of a copolymer of propylene comprising from 15 to 35%wt of ethylene units, said polymer composition having a melt flow rate value according to ISO 1133 (230°C, 2.16 Kg) of less than 10 g/10min.
Abstract:
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°C, 2.16 Kg) of from 20 to 40 g/10 min.
Abstract:
Heat-sealable polyolefin film made of or comprising at least one layer of a polyolefin composition comprising (percent by weight): A) 20% to 80% of a heterophasic polyolefin composition comprising: A1) 3% to 30% by weight of a crystalline olefin polymer fraction; Aπ) 70% to 97% by weight of an elastomeric fraction comprising at least an elastomeric copolymer of propylene or ethylene with 12 to 88% by weight of at least one α- olefin of formula H 2 C=CHR, where R is H or a C2-C10 linear or branched alkyl, optionally containing 0.5 to 5% by weight of a diene, and having solubility in xylene at room temperature greater than 50% by weight; B) 20% to 80% of at least one filler.
Abstract:
Stretch blow molded containers comprising a propylene polymer composition produced with a metallocene catalyst, the propylene polymer composition comprising: A. 25.0 wt % to about 75.0 wt% of a homopolymer or minirandom copolymer of propylene containing up to 1.0 wt % of at least one of ethylene and C 4 -C 10 α. olefins, having an isotactic index greater than about 80%; and B. 25.0 wt% to about 75.0 wt% of a random copolymer of propylene and at least one olefin chosen from ethylene and C 4 -C 10 α-olefins, containing about 0.3 to about 30 wt% of said olefin, and having an isotactic index greater than about 60%; wherein the propylene polymer composition has a melt flow rate of 1 to 50 and a molecular weight distribution of less than 3.5.
Abstract:
Process for the preparation of a solid catalyst component for the polymerization of olefins, the process comprising the steps of: - continuously contacting solid particles of a MgCl 2 .mROH adduct, wherein 0.5 2 .nROH, wherein n is lower than m; - reacting the slurry from step a) with one or more titanium compounds of formula Ti(OR) p X q-p , wherein q=3-4 and p=0-q, X is an halogen and R is an alkyl, cicloalkyl or aryl radical having 1-18 carbon atoms.
Abstract:
A process for enriching the peroxide content of a peroxide-containing olefin polymer comprises: a) contacting the peroxide-containing olefin polymer with a first gas mixture having a first oxygen concentration in a reactor; b) heating the olefin polymer to a first temperature at least equal to a preparative temperature but below a softening point of the olefin polymer, in the presence of a second gas mixture having a second oxygen concentration, wherein the preparative temperature is a last heat treatment temperature when making the peroxide-containing olefin polymer; and c) maintaining the temperature of the olefin polymer at a second temperature from at least 80 ° C but below the softening point of the polymer in an atmosphere having an oxygen concentration of at most 0.004% by volume, thereby forming an enriched peroxide-containing polyolefin material.
Abstract:
A propylene ethylene copolymer having: i) xylene soluble fraction at 25°C ranging from 30 wt% to 48 wt%; ii) intrinsic viscosity of the fraction soluble in xylene at 25°C ranging from 2.8 to 4.3 dl/g; iii) melt flow rate, MFR, measured according to ISO 1133 at 230 °C with a load of 2.16 kg, ranging from 0.2 g/10 min to 10 g/10 min; iv) an ethylene derived units content ranging from 10.3 wt% to 15.4 wt% v) the ethylene derived units content on the fraction insoluble in xylene at 25°C ranging from 6.1 wt% to 9.0 wt%; vi) the ethylene derived units content on the fraction soluble in xylene at 25°C ranging from 18.2. wt% to 30.2 wt%; vii) the 13C-NMR sequences PEP measured on the fraction insoluble in xylene at 25°C ranging from 4.1mol% to 6.5mol% and the 13C-NMR sequences PEP measured on the fraction soluble in xylene at 25°C ranging from 10.5 mol% to 14.2 mol%.
Abstract:
Pre-treatment methods for polyolefin-based feed streams before depolymerization are described. Polyolefins are separated from other material in the polyolefin-based feed stream using density differences in an aqueous solution, which allows for a pre-treatment method that does not affect the depolymerization catalyst. By removing the non-polyolefin materials from the feed stream, the depolymerization of the polyolefin material can proceed at lower temperatures for longer cycles. This results in a more efficient process with a smaller carbon footprint.