摘要:
A film comprising a polymer blend of 0.3 to 0.8 wt % LDPE; and 99.2 to 99.7 wt % LLDPE, the LDPE having an MI of 0.1 to 0.6 dg/min, and the blend having a slice long chain branching of at least 0.96 for any portion of the composition having a molecular weight of 100,000 or above, wherein the film is formed from an extrudate of the blend.
摘要:
Disclosed is a multimodal, high density, homopolyethylene barrier resin. The resin is preferably made by a multistage process. The process comprises a first stage in which ethylene is homopolymerized in the presence of a Ziegler-Natta catalyst, organoaluminum cocatalyst, alkoxysilane modifier, and hydrogen. The reaction mixture from the first stage is devolatilized to remove all or substantially all of the hydrogen. The polymerization continues in a second stage wherein ethylene is added to the devolatilized reaction mixture to produce the barrier resin. The barrier resin provides films with improved barrier properties.
摘要:
A plant gas to be flared in the atmosphere is periodically sampled and analyzed as to its Btu content, a first comparison made of 1) the most recent of such analyses with 2) a predetermined steady state set point, a second comparison made of 3) an average of a plurality of such analyses including an historical minimum Btu content with 4) a predetermined dynamic set point, and fuel added to the plant gas based on the larger fuel requirement of these first and second comparisons.
摘要:
Adhesive compositions suitable for use as tie-layer adhesives in multi-layer films and sheets are provided. The adhesive compositions contain an olefin polymer base resin, a modified polyolefin and a paraffinic liquid hydrocarbon.
摘要:
Catalysts useful for polymerizing olefins are disclosed. The catalysts comprise an activator and a Group 4 metal complex that incorporates a dianionic, tridentate 2-aryl-8-anilinoquinoline ligand. In one aspect, supported catalysts are prepared by first combining a boron compound having Lewis acidity with excess alumoxane to produce an activator mixture, followed by combining the activator mixture with a support and the tridentate, dianionic Group 4 metal complex. The catalysts are easy to synthesize, support, and activate, and they enable facile production of high-molecular-weight polyolefins.
摘要:
A multilayer film and a method of making the film are disclosed. In the method a multilayer film is post-oriented uniaxially in the machine direction resulting in a film that has a water vapor transmission rate of less than 2.5 g-mil/m2-day and an oxygen transmission rate of less than 1.5 cm2-mil/m2-day. The film of this invention is ideal for applications requiring low water vapor and oxygen transmission rates.
摘要翻译:公开了一种多层膜及其制造方法。 在该方法中,多层膜在机器方向上单向后取向,导致膜的水蒸气透过率小于2.5g / m 2·日,氧气透过率小于1.5cm2·mil / m2天。 本发明的膜对于需要低水蒸气和氧气传输速率的应用是理想的。
摘要:
A method for the control of a polymerization process, which method employs the combination of a densitometer measurement of the polymerization reaction mixture and a quadratic computer model.
摘要:
A slurry process for polymerizing ethylene is disclosed. The process comprises polymerizing ethylene in the presence of an α-olefin, hydrogen, and a catalyst comprising an activator and a supported, dimethylsilyl-bridged bis(indenoindolyl)zirconium complex. The process has high catalyst activity and produces polyethylene having a broad molecular weight distribution.
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 slurry process for polymerizing ethylene is disclosed. The process comprises polymerizing ethylene in the presence of an α-olefin and a catalyst comprising an activator and a supported bridged indeno[1,2-b]indolyl zirconium complex. The process produces polyethylene characterized by good incorporation of the α-olefin and moderate long-chain branching. The process is capable of forming high molecular weight polyethylene and has good catalyst activity.