摘要:
The present invention relates to monohydroindacenyl complexes as active catalytic components in the copolymerization of ethylene. The complexes are suitable for direct preparation of ethylene copolymers having a narrow molecular distribution as well as the desired levels of low density and preferably a predetermined value of glass transition temperature Tg. The produced copolymers showing improved elastomeric performance can be prepared in a single step during polymerization reaction, thus avoiding a blending step following the polymerization step.
摘要:
A method for preparing a supported catalyst suitable for use in slurry and gas-phase olefin polymerizations is disclosed. An alumoxane-treated silica is combined with a monocyclopentadienyl Group 6 metal complex that comprises a chelating Cp moiety to give the supported catalyst. The method is simple to practice and provides catalysts having high activity. Polyolefins made using the catalysts have high molecular weight that is readily controlled by adding hydrogen.
摘要:
A novel PE material is devised showing excellent mechanical/optical properties and process ability, e.g. for film extrusion. The polyethylene of the invention is produced in one single e.g. gas phase reactor.
摘要:
Method of changing from a polymerization using a first catalyst to a polymerization using a second catalyst which is incompatible with the first catalyst in a gas-phase reactor, which comprises the steps a) stopping of the polymerization reaction using the first catalyst, b) flushing of the reactor under polymerization conditions with at least one deactivating agent comprising a volatile constituent and a nonvolatile constituent in a weight ratio of from 0.1 to 1000, c) introduction of the second catalyst into the reactor and d) continuation of the polymerization using the second catalyst.
摘要:
Polyethylene which comprises ethylene homopolymers and/or copolymers of ethylene with 1-alkenes and has a molar mass distribution width Mw/Mn of from 3 to 30, a density of from 0.945 to 0.965 g/cm3, a weight average molar mass Mw of from 50 000 g/mol to 200 000 g/mol, a HLMI of from 10 to 300 g/10 min and has from 0.1 to 15 branches/1000 carbon atoms, wherein the 1 to 15% by weight of the polyethylene having the highest molar masses have a degree of branching of more than 1 branch of side chains larger than CH3/1000 carbon atoms, a process for its preparation, catalysts suitable for its preparation and also injection moldings in which this polyethylene is present.
摘要翻译:聚乙烯,其包含乙烯均聚物和/或乙烯与1-烯烃的共聚物,其摩尔质量分布宽度Mw / Mn为3至30,密度为0.945至0.965g / cm 3,重均摩尔质量Mw为 50 000 g / mol至200 000 g / mol,HLMI为10至300 g / 10 min,具有0.1至15个支链/ 1000个碳原子,其中1至15重量%的具有最高摩尔数的聚乙烯 质量具有大于1分支的大于CH 3/1000碳原子的侧链的分支程度,其制备方法,适用于其制备的催化剂以及其中存在该聚乙烯的注射成型品。
摘要:
A novel adhesive composition suitable for composing multilayered coatings onto large, industrial equipment such as pipeline tubes is devised. The composition is a blend based on a polyethylene which determines the blend's favorable properties, which polyethylene itself can be used further in coating cables and for producing mouldings, especially rotomoulded articles.
摘要:
A copolymer of ethylene, a catalyst system suitable to prepare the copolymer, and a process to prepare such copolymer are described. The copolymer comprises from 60 to 80% by weight of ethylene and from 20 to 40% by weight of at least one first α-olefin comonomer having n carbon atoms and at least one second α-olefin comonomer having (n−1) carbon atoms, n being from 4 to 13, has a polydispersity Mw/Mn equal to or lower than 3.5, and a density from 0.855 to 0.880 g/cm3. The copolymer is obtained by subjecting ethylene and said at least one first α-olefin comonomer to a polymerization stage in the presence of a catalyst system capable of forming a copolymer of ethylene and said at least one first α-olefin comonomer having n carbon atoms, while forming the second α-olefin comonomer having (n−1) carbon atoms.
摘要翻译:描述了乙烯的共聚物,适于制备共聚物的催化剂体系,以及制备这种共聚物的方法。 共聚物包含60至80重量%的乙烯和20至40重量%的至少一种具有n个碳原子的至少一种第一α-烯烃共聚单体和至少一种具有(n-1)个碳原子的第二α-烯烃共聚单体 n为4〜13,多分散性Mw / Mn为3.5以下,密度为0.855〜0.880g / cm 3。 该共聚物是通过使乙烯和所述至少一种第一α-烯烃共聚单体在能够形成乙烯和所述至少一种具有n个碳原子的第一α-烯烃共聚单体的共聚物的催化剂体系存在下进行聚合反应得到的, 同时形成具有(n-1)个碳原子的第二α-烯烃共聚单体。
摘要:
Process for preparing an antistatic for olefin polymerization by contacting an antistatically acting compound comprising at least one hydrogen atom bound to a nonmetallic heteroatom with at least one metal alkyl in an amount which is sufficient to react completely with the at least one hydrogen atom bound to a heteroatom, wherein the antistatically acting compound and the metal alkyl are each present in a concentration of at least 0.01% by weight during contacting.