Abstract:
A solution process for polymerizingone or more α-olefins of formula CH 2 =CHR, where R is H or an alkyl radical C 1-12 ,to produce a polyolefin soluble in the reaction medium, the process comprising: a) polymerizing said one or more α-olefins in a solution phase in the presence of a polymerization catalyst and a inert solvent having a vapor pressure lower than 100 kPa at 20°C; b) separating the produced polyolefin from the unreacted monomers and the inert solvent by means of a sequence of at least three volatilization chambers operating at a decreasing pressure, the second devolatilization chamber being operated at a pressure from 0.8 to 5 bar.
Abstract:
Adducts comprising a MgC1 2, an alcohol ROH in which R is a C1 -C1O hydrocarbon group, present in a molar ratio with MgC1 2 ranging from 0.5 to 5 and less than 15% wt, based on the total weight of the adduct, of a metal salt of an aliphatic carboxylic acid having from 8 to 22 carbon atoms.
Abstract:
Solid adducts comprising MgCl 2 and water and optionally an organic hydroxy compound (A) selected from hydrocarbon structures containing at least one hydroxy group, said compounds being present in molar ratio defined by the following formula MgCl 2 •(H 2 0) n (A) p in which n is from 0.6 to 6, p ranges from 0 to 3, said adduct having a porosity (P F ), measured by the mercury method and due to pores with radius equal to or lower than 1μm, of at least 0.15 cm 3 /g with the proviso that when p is 0, (P F ) is equal to or higher than 0.3 cm 3 /g.
Abstract translation:包含MgCl 2和水以及任选的选自含有至少一个羟基的烃结构的有机羟基化合物(A)的固体加合物,所述化合物以限定的摩尔比存在 通过以下公式MgCl 2·(H 2 O)n(A)p·p其中n为从 0.6至6,p的范围为0至3,所述加合物具有通过汞法测量的孔隙率(P F)和由于半径等于或低于1μm的孔隙而至少为0.15 cm 3 / g,条件是当p为0时,(P F)等于或高于0.3 cm 3 / g / g。 p>
Abstract:
A method for preparing a catalytic composition for the olefin polymerization in the form of a dispersion of catalyst particles in a semi-fluid matrix, characterized in that it comprises the steps of: a) forming a suspension of catalyst particles in oil by loading under a continuous stirring dry catalyst powder into a tank containing said oil, the load velocity of the catalyst powder per m 2 of oil interface being less of 800 kg/h*m 2 ; b) adding under stirring a molten thickening agent having a melting point in a range from 30 to 70°C, while maintaining the catalyst suspension in oil at a temperature such that said thickening agent solidifies on contact with said suspension.
Abstract translation:制备催化剂颗粒在半流体基质中的分散体形式的用于烯烃聚合的催化组合物的方法,其特征在于其包括以下步骤:a)在催化剂颗粒在油中形成悬浮液, 将连续搅拌的干燥催化剂粉末连续搅拌到含有所述油的罐中,每m 2油界面的催化剂粉末的负载速度小于800kg / h * m 2; b)在搅拌下加入熔点为30-70℃的熔融增稠剂,同时将催化剂悬浮液保持在使所述增稠剂与所述悬浮液接触时固化的温度。
Abstract:
Process for preparing TiO 2 powders starting from a liquid comprising chlorinated titanium compounds, the process comprising: a) atomizing said liquid and reacting the atomized liquid with a flow of steam and air at a temperature of 100-250°C for converting said chlorinated titanium compounds to titanium dioxide TiO 2 ; b) the gaseous phase and the entrained TiO 2 powders obtained from step a) are then fed to an oven operated at a temperature in the range 400-900°C to remove the residual organic compounds and hydrochloridic acid from said powders.
Abstract:
Prepolymerized catalyst component for the polymerization of olefins CH 2 =CHR, wherein R is hydrogen or a C 1 -C 12 hydrocarbyl group, comprising a solid catalyst component characterized by comprising Mg, Ti halogen and an electron donor (ID) selected from the alkyl esters of aromatic dicarboxylic acids in such an amount that the molar ratio ID/Mg ranges from 0.025 to 0.07 and the Mg/Ti molar ratio is higher than 13, said prepolymerized catalyst component containing an amount of ethylene pre-polymer up to 5Og per g of said solid catalyst component.
Abstract:
Propylene-ethylene copolymers are flexible and show a very good balance between softness and mechanical properties in their crude state are obtained by solution polymerization in the presence of Ziegler-Natta catalysts. The said copolymers comprise from 10 to 50%wt of ethylene and are characterized by: product of the comonomer reactivity ratio r1•r2 ≤1.5; absence of 2,1 propylene insertions and tensile strength at break higher than 4 Mpa.
Abstract:
The present invention relates to a process for preparing a M g Cl 2 -alcohol adduct which comprises, (a) forming a mixture of an M g Cl 2 -alcohol adduct in molten form and a liquid which is immiscible with the said adduct, (b) subjecting the mixture to a shear stress in order to obtain an emulsion, and (c) rapidly cooling the emulsion to solidify the disperse phase and collecting the solid adduct particles, said process being characterized by the fact that step (b) is carried out in a device comprising a first outer and second inner cylindrical members that define an annulus between them, wherein at least one of said cylindrical members rotate with respect to the other.
Abstract:
Catalyst component comprising Mg, Ti, and halogen atoms, and is characterized in that (a) the Ti atoms are present in an amount higher than 4% based on the total weight of the said catalyst component, (b) the amount of Mg and Ti atoms is such that the Mg/Ti molar ratio is higher than 2 and (c) by a X-ray diffraction spectrum, in which, in the range of 2θ diffraction angles between 47° and 52°, at least two diffraction lines are present at diffraction angles 2θ of 48.3 ± 0.2°, and 50.0 ± 0.2°, the most intense diffraction lines being the one at 2θ of 50.0 ± 0.2°, the intensity of the other diffraction line being equal to or lower than the intensity of the most intense diffraction line.
Abstract:
Compositions of additives for plastics comprising the following components (percent by weight): A) from 1% to 25% of a polyolefÊn matrix comprising one or more polyolefins having a melting point of 160 0C or less, said melting point being determined by differential scanning calorimetry (DSC), according to ISO 11357; B) from 75% to 99% of one or more solid additives for polymers.