摘要:
A 1-butene polymer optionally containing from 0 to 30% by mol of derived units of ethylene, propylene or alpha-olefÊn of formula CH2=CHZ, wherein Z is a C 3 -C 20 linear or branched alkyl radical, having the following features: a) distribution of molecular weight (Mw/Mn) lower than 4; b) Melt flow rate (MFR) measured according to ISO 1133 (190°C, 2.16kg); c) Intrinsic viscosity (IV) measured in tetrahidronaftalene (THN) at 135°C lower than 0.8 dl/g; d) melting point higher than 100°C; e) isotactic pentads (mmmm) measured with 13 C-NMR operating at 100.61 MHz higher than 90%; f) 4,1 insertions not detectable at a C 13 -NMR operating at 100.61 MHz; and g) a yellowness index lower than 0. A process for preparing such a 1-butene polymer using a particular metallocene-based catalyst system is also disclosed in the present invention.
摘要:
This invention is directed to a polymerization process that is carried out at relatively high productivity levels and with relatively low fouling. The process includes mixing together a catalyst system, at least one monomer and a hydrofluorocarbon to produce the polymer. The reaction is carried out such that little to no chlorine containing hydrocarbons are present.
摘要:
A very low density polyethylene (VLDPE) film is disclosed. The film has a high average heat seal strength and physical strength. The VLDPE has a density within the range of about 0.880 to 0.914 g/cm 3 . The film has a seal initiation temperature lower than or equal to 95 o C and an average heat seal strength greater than or equal to 1.75 lb/in. The film has a machine-direction (MD) modulus greater than or equal to 12,000 psi. The film can be used as a monolayer film or as a layer of a multilayer film. It is suitable for heat sealable bags and many other applications.
摘要翻译:公开了一种非常低密度的聚乙烯(VLDPE)膜。 该膜具有高的平均热封强度和体力。 VLDPE的密度在约0.880至0.914g / cm 3的范围内。 该膜具有低于或等于95℃的密封起始温度和大于或等于1.75磅/英寸的平均热密封强度。 该膜具有大于或等于12,000psi的机器方向(MD)模量。 该膜可以用作单层膜或多层膜的层。 它适用于热封袋和许多其他应用。
摘要:
The present invention relates to a method of preparing an ethylene polymerization catalyst, which comprises reacting a solid reaction product of magnesium halide (such as magnesium chloride), alcohol, an organic magnesium compound, and a halogen compound with a transition metal compound and an electron donor. When ethylene and a-olefin are co-polymerized by slurry polymerization in the presence of the above catalyst, the amount of wax component extracted by the polymerization solvent is very low, and the polymer particles do not agglomerate. The catalyst is prepared in the form of so uniform particles that the resultant polymer has uniform particle morphology, thus increasing bulk density.
摘要:
A process for preparing a broad molecular weight polyethylene carried out in the presence of a catalyst system comprising (i) a solid catalyst component comprising Mg, Ti, halogen, and optionally an internal electron donor compound, and (ii) an Al-alkyl cocatalyst said process comprising at least two step of polymerization (a) and (b), in which, - in a first step (a) ethylene is polymerized in the presence of a molecular weight regulator in order to produce a ethylene (co)polymer, and in a further step (b), which is carried out in the presence of an external electron donor compound added to this polymerization step as a fresh reactant, ethylene is copolymerized with an alpha olefin of formula CH2=CHR, in which R is a C1-C20 hydrocarbon group, to produce an ethylene copolymer having a molecular weight higher than that of the copolymer produced in step (b).
摘要:
A multistage process comprising the step of polymerizing propylene in the presence the presence of a catalysts system, comprising one or more metallocene compound of formula (I): wherein M is an atom of a transition metal; p is an integer from 0 to 3, X, same or different, is a hydrogen atom, a halogen atom, or a hydrocarbon group; L is a divalent bridging R 1 and R 2 , are C 1 -C 20 -alkyl radicals; T, equal to or different from each other, is a moiety of formula (Ilb) or (Ila): wherein R 3 , R 4 , R 5 , R 6 , R 7 , R 3’ , R 4’ , R 5’ ,R 6’ and R 7’ , are hydrogen atoms or hydrocarbon groups; with the proviso that at least one among R 3 , R 4 , R 5 , R 6 , R 7 is different from hydrogen; R 11 is a hydrogen atom or a hydrocarbon group; R 8 , R 9 and R 10 , are hydrogen atoms or hydrocarbon groups; and further comprising the step of contacting, under polymerization conditions, in a gas phase, ethylene and one or more comonomers. Where the amount of the polymer obtained in the first step ranges from 5% by weight and 90% by weight, of the polymer obtained in the whole process.
摘要:
A multistage process for obtaining an heterophasic propylene polymer comprising the following steps: step a) contacting under polymerization conditions propylene and optionally ethylene or one or more alpha olefins in the presence of a catalysts system, supported on a porous organic polymer, comprising: ii) one or more metallocene compounds of formula (1) wherein: M is an atom of a transition metal; p is an integer from 0 to 3; X, same or different, is a hydrogen atom, a halogen atom, or a hydrocarbon group; L is a divalent bridging group; R 1 , is a linear or branched, saturated or unsaturated C 1 -C 20 -alkyl radical; R 2 is a branched C 1 -C 20 -alkyl radical; T, equal to or different from each other is a moiety of formula : wherein: the atom marked with the symbol bonds the atom marked with the same symbol in the compound of formula (I); R 5 -R 13 , equal to or different from each other, are hydrogen atoms or hydrocarbon groups; ii) an alumoxane or a compound capable of forming an alkyl metallocene cation; and optionally iii) an organo aluminum compound; step b) contacting, under polymerization conditions, in a gas phase, ethylene and one or more alpha olefins and optionally in the presence of an additional organo aluminum compound.
摘要翻译:用于获得多相丙烯聚合物的多阶段方法包括以下步骤:步骤a)在负载在多孔有机聚合物上的催化剂体系存在下,在聚合条件下使丙烯和任选的乙烯或一种或多种α-烯烃接触,包括:ii) 一种或多种式(1)的茂金属化合物,其中:M是过渡金属的原子; p是0至3的整数; X相同或不同,是氢原子,卤素原子或烃基; L是二价桥基; R 1是直链或支链饱和或不饱和的C 1 -C 20 - 烷基; R 2是支链C 1 -C 20 - 烷基; T是相同或不同的,是下式的部分:其中:标记有符号的原子与式(I)化合物中与相同符号标记的原子键合; R 5〜R 13彼此相同或不同,为氢原子或烃基; ii)铝氧烷或能够形成烷基茂金属阳离子的化合物; 和任选地iii)有机铝化合物; 步骤b)在聚合条件下,在气相,乙烯和一种或多种α-烯烃中以及任选地在另外的有机铝化合物的存在下接触。
摘要:
A tape, fibre or filament suitable for use in nets is disclosed, comprising a polyethylene resin having a density of 940-965 kg/m 3 and a melt index MI 5 of 0.8-1.5 g/10 mins.
摘要翻译:公开了适用于网络的胶带,纤维或长丝,其包含密度为940-965kg / m 3,熔体指数MI5为0.8-1.5g / 10mins的聚乙烯树脂。
摘要:
The present invention relates to catalyst systems of the Ziegler-Natta type, to a process for preparing them, to their use for the polymerization of olefins and to ethylene copolymers which can be prepared using this catalyst system.