摘要:
Disclosed is a method for preparing polyolefin-based adhesives. In the method, a maleated polyolefin is blended, in sequence, with a polyolefin elastomer and then with a linear low density polyethylene. The polyolefin-based adhesive made according to the method of the invention shows improved clarity and adhesion in multilayer polyolefin films.
摘要:
A process is disclosed for regenerating a used catalyst comprising two or more noble metals supported on a carrier. The method comprises calcining a used catalyst comprising a noble metal and a transition metal supported on an inorganic carrier in an oxygen-containing gas to produce a calcined catalyst; and contacting the calcined catalyst with a hydrogen-containing gas at a temperature higher than 430°C.
摘要:
A slurry process for polymerizing ethylene is disclosed. The process comprises polymerizing ethylene in the presence of an a-olefin and a catalyst comprising an activator and a supported bridged bis-indeno[2,1-b]indolyl zirconium complex. The process uses a highly active catalyst and provides polyethylene characterized by a high level of long-chain branching.
摘要:
A process to prepare a multimodal polyethylene with controlled LCB distribution is disclosed. In the first stage, ethylene is polymerized in the presence of a Ziegler catalyst that results in a homopolyethylene component having a higher LCB concentration. In the second stage, ethylene is copolymerized with a 1-olefin in the presence of the Ziegler catalyst and a lower concentration of hydrogen resulting in a copolymer component with a lower LCB concentration. The homopolyethylene component and the copolymer component are combined to form a novel multimodal polyethylene.
摘要:
A process for polymerizing ethylene is disclosed. The polymerization is performed in the presence of a Ziegler-Natta catalyst system in two slurry reaction zones. Most of the polyethylene (70-95 wt.%) is produced in one of the zones, while a smaller fraction is produced in the other zone. The ratio of the weight average molecular weight of the smaller fraction to that of the larger fraction is greater than 8:1. The resulting polyethylene blend, which should have both high melt strength and high extrudate swell, will be useful for blow-molding applications.
摘要:
Disclosed is a method of preparing an ultra-high molecular weight, linear low density polyethylene with a catalyst system that comprises a bridged indenoindolyl transition metal complex, a non-bridged indenoindolyl transition metal complex, an alumoxane activator and a boron-containing activator. The ultra-high molecular weight, linear low density polyethylene has a weight average molecular weight greater than 1,000,000 and a density less than 0.940 g/cm 3 .
摘要翻译:公开了一种制备具有包含桥连茚基吲哚基过渡金属络合物,非桥连茚并吲哚基过渡金属络合物,铝氧烷激活剂和含硼活化剂的催化剂体系的超高分子量线性低密度聚乙烯的方法。 超高分子量线性低密度聚乙烯的重均分子量大于1,000,000,密度小于0.940g / cm 3。
摘要:
A method for rendering a high Reid Vapor Pressure natural gasoline feed suitable for addition to the gasoline pool by using steam stripping conditions that provide an overhead fraction that is suitable for thermal cracking, and a bottoms product that has a substantially reduced Reid Vapor Pressure as compared to the natural gasoline feed.
摘要:
Adhesive blends suitable for use as tie-layer adhesives for a variety of substrates used in multi-layer film and sheet constructions are provided. The adhesive blends contain a polyolefin base resin, a functionalized polyolefin and a propylene elastomer containing isotactic propylene crystallinity.
摘要:
A rotary seal housing having opposing ends (43, 44), a first fluid conducting slot (71) at one of the opposing ends, a pair of spaced apart fluid conducting slots (60, 61) at the other opposing end, and sets of apertures (64) connecting the first fluid conducting slot (71) with the pair of fluid conducting slots (60,61), the housing having helical push back grooves that are arcuate in cross-section.
摘要:
A method and apparatus for operating a pressure vessel containing a bed of particulate material comprising substantially leveling the bed and employing a plug-flow inducer in the bed.