摘要:
Process for the preparation of a polyolefin Olefins of the formula R11—CH═CH—R12 (R11, R12=H or C1-C14-alkyl) are polymerized in the presence of a catalyst consisting of at least one metallocene of the formula I (M=zirconium or hafnium) and an aluminoxane. Polymers having a high molecular weight are obtained in a high yield.
摘要:
A highly effective catalyst system for the polymerization or copolymerization of olefins comprises at least one metallocene as transition-metal compound and at least one aluminum compound of the formula II ##STR1## and/or of the formula (III) ##STR2## where, in the formulae (II) and (III), the radicals R.sup.14 may be identical or different and are an alkyl group, an aryl group, benzyl or hydrogen, and p is an integer from 2 to 50, and at least one aluminum compound of the formula IV ##STR3## where R.sup.15, R.sup.16 and R.sup.17 are identical or different and are a hydrogen atom, an alkyl group, an alkylsilyl group, an alkoxy group, an aryl group, an aryloxy group, an alkenyl group, an arylalkyl group, an alkylaryl group, an arylalkenyl group, a halogen atom or a radical of the formula --OSiR.sup.15 R.sup.16 R.sup.17 where R.sup.15, R.sup.16 and R.sup.17 are as defined in the description.
摘要翻译:用于烯烃聚合或共聚的高效催化剂体系包括至少一种茂金属作为过渡金属化合物和至少一种式II和/或式(III)的铝化合物,其中在式(II)和 (III)中,基团R14可以相同或不同,为烷基,芳基,苄基或氢,p为2-50的整数,至少一种式IV的铝化合物,其中R 15,R 16 R 17相同或不同,为氢原子,烷基,烷基甲硅烷基,烷氧基,芳基,芳氧基,烯基,芳基烷基,烷基芳基,芳基烯基,卤素 原子或式-OSiR15R16R17的基团,其中R15,R16和R17如说明书中所定义。
摘要:
A process for the preparation of a polyolefin wax If a catalyst consisting of an aluminoxane and a metal-locene of the formula I ##STR1## in particular R.sup.5 R.sup.6 C (Ind).sub.2 or R.sup.5 R.sup.6 C (Ind).sub.2 Zr(CH.sub.3).sub.2, is employed for the polymerization of olefins of the formulaR.sup.9 CH.dbd.CHR.sup.10(R.sup.9, R.sup.10 =H or C.sub.1 -C.sub.28 alkyl), the isotacticity of the polymer wax and hence the hardness and melting point can be varied simply by changing the polymerization temperature, without the molecular weight of the polymer being noticeably changed at the same time.
摘要翻译:用于制备聚烯烃蜡的方法如果由铝氧烷和式I的金属 - 特别是R 5 R 6 C(Ind)2或R 5 R 6 C(Ind)2 Zr(CH 3)2组成的催化剂用于聚合 式R9CH = CHR10(R9,R10 = H或C1-C28烷基)的烯烃,聚合物蜡的全同立构规整度,因此硬度和熔点可以通过改变聚合温度而简单地改变,而不需要聚合物的分子量 同时明显改变。
摘要:
A very efficient catalyst system for the polymerization of 1-olefins consists of an aluminoxane and a metallocene which is a compound of the formula I ##STR1## in which R.sup.1 and R.sup.2 denote hydrogen atoms, halogen atoms or hydrocarbon radicals and R.sup.3 and R.sup.4 are mononuclear or polynuclear hydrocarbon radicals which can form a sandwich structure with the central atom and which are linked to one another by a --R.sup.6.sub.m --R.sup.5 --R.sup.7.sub.n -- bridge containing a hetero atom and consisting of one or several members. The catalyst system produces polymers having a high molecular weight and excellent grain morphology.
摘要:
A syndiotactic propylene copolymer is obtained in high yields by copolymerization of propylene with small amounts of other olefins in the presence of a catalyst comprising a metallocene of the formula I ##STR1## in which M.sup.1 is titanium, zirconium, hafnium, vanadium, niobium or tantalum and an aluminoxane. This copolymer has a very high molecular weight, a very narrow molecular weight distribution, very high syndiotaxicity, advantageously low melting points and rubber-like behavior. Molded articles produced from the polymer are distinguished by high transparency, flexibility and tear strength. Their main areas of application are packagings of any type.
摘要:
A very active catalyst system for olefin polymerization comprises a cocatalyst, preferably an aluminoxane, and a metallocene of the formula I ##STR1## in which, preferably, M.sup.1 is Zr or Hf, R.sup.1 and R.sup.2 are alkyl or halogen, R.sup.3 is hydrogen, R.sup.4 to R.sup.6 and alkyl or aryl, --(CR.sup.8 R.sup.9).sub.m --R.sup.7 --(CR.sup.8 R.sup.9).sub.n is a single- or multi-membered chain, in which R' can also be a (substituted) hetero atom, and m+n is zero or 1.
摘要:
A propylene block copolymer having good flow properties and a very good low temperature impact strength is obtained in a high yield if a catalyst which consists of a chiral metallocene, containing a bridge, of the formula I ##STR1## and an aluminoxane is used for the polymerization of propylene and the comonomers.The polymerization is carried out in two stages, a crystalline propylene polymer being prepared in the first stage.
摘要:
A polyolefin film which comprises a polypropylene base layer and at least one top layer comprising a propylene polymer, wherein the base layer is formed of an isotactic polypropylene and the top layer of a copolymer of an o-olefin having 2 to 8 carbon atoms and a syndiotactic propylene, has high sealed-seam strength and excellent optical properties and is useful as, for example, a packaging material.
摘要:
A very active catalyst system for olefin polymerization is composed of an aluminoxane and a metallocene of the formula I ##STR1## wherein preferably M.sup.1 is Zr or Hf, R.sup.1 and R.sup.2 are alkyl or halogen, R.sup.3 and R.sup.4 are hydrogen, R.sup.5 and R.sup.6 are alkyl or haloalkyl, --(CR.sup.8 R.sup.9).sub.m --R.sup.7 --(CR.sup.8 R.sup.9).sub.m --is a single-membered or multimembered chain in which R.sup.7 may also be a (substituted) hetero atom, and m+n is zero or 1. The catalyst system gives polymers having a high molecular weight and high stereospecificity.
摘要:
A syndiotactic polyolefin is obtained in a high yield by polymerization or copolymerization of an olefin of the formula R.sup.a --CH.dbd.CH--R.sup.b in the presence of a catalyst consisting of a metallocene of the formula I ##STR1## and an aluminoxane. This polyolefin has a very high syndiotactic index. At a low polymerization temperature, a polyolefin having a low average molecular weight and narrow molecular weight distribution is obtained, and at a high polymerization temperature a polymer having a high average molecular weight and a wide molecular weight distribution is obtained.Shaped articles produced from the polymers are distinguished by a high transparency, flexibility, tear strength and excellent surface gloss.
摘要翻译:在由式I(I)的茂金属和铝氧烷组成的催化剂的存在下,通过式R a -CH = CH-R b的烯烃的聚合或共聚,可以高产率获得间同立构聚烯烃。 该聚烯烃具有非常高的间同立构指数。 在低聚合温度下,获得具有低平均分子量和窄分子量分布的聚烯烃,并且在高聚合温度下获得具有高平均分子量和宽分子量分布的聚合物。 由聚合物制成的成型品通过高透明度,柔韧性,撕裂强度和优异的表面光泽来区分。