Patent application number | Description | Published |
20080247263 | Method to Increase Production Rate of a Continuous Mixer or Extruder - Compounding or extrusion rates can be increased by splitting the polymer solid feed. Melting of additional solid polymer is significantly assisted by excess enthalpy from incoming melt from a primary mixing stage. Depending on resin rheology and melting characteristics, rate increases were achieved of from up to about 55 to about 100% rate increase over the use of a single feed at the same rotor speed. The net result is a decrease in the overall SEI (specific energy input to the polymer) and thus melt temperatures. | 10-09-2008 |
20090069491 | PEROXIDE-FREE DIRECT GRAFTING OF POLAR MONOMERS ONTO UNSATURATED POLYOLEFINS - The present invention is a peroxide-free process for preparing a direct-grafted polyolefin. The process has the steps of (a) selecting an antioxidant-free, unsaturated polyolefin, (b) oxidizing the polyolefin, (c) selecting a graftable, polar monomer, (d) combining the polyolefin and the graftable, polar monomer, (e) forming free radicals on the oxidized polyolefin, and (f) grafting the graftable, polar monomer onto the polyolefin at the free-radical sites. | 03-12-2009 |
20090246433 | RHEOLOGY MODIFIED RELATIVELY HIGH MELT STRENGTH POLYETHYLENE COMPOSITIONS AND METHODS OF MAKING PIPES, FILMS, SHEETS, AND BLOW-MOLDED ARTICLES - A polymer composition comprises a low-molecular-weight (LMW) ethylene polymer component and a high-molecular-weight (HMW) ethylene polymer component coupled with a polysulfonyl azide. Preferably, the LMW polyethylene component and the HMW polyethylene component co-crystallize in the composition such that it exhibits a single or substantially single peak in a lamella thickness distribution (LTD) curve. The ethylene polymer for the LMW and the HMW polyethylene components can be either homopolymer or ethylene copolymer. Preferably, both components are an ethylene copolymer of the same, or different, composition (that is, with the same or different comonomers). A method of making a pipe that includes selecting a polymer composition having a substantially single peak in the LTD curve is described. Compositions comprising a chromium-catalyzed ethylene polymer, coupled with a polysulfonyl azide are also described herein. | 10-01-2009 |
20100003439 | POLYETHYLENE COMPOSITIONS, METHODS OF MAKING THE SAME, AND ARTICLES PREPARED THEREFROM - The invention is related to compositions suitable for the fabrication of pipes, and other articles, with excellent performance properties. The invention provides a composition, comprising a blend, wherein said blend comprises a high molecular weight ethylene-based interpolymer and a low molecular weight ethylene-based interpolymer, and the high molecular weight ethylene-based interpolymer is a heterogeneously branched linear or a homogeneously branched linear ethylene-based interpolymer, and has a density from 0.922 g/cc to 0.929 g/cc, and a high load melt index (I21) from 0.2 g/10 min to 1.0 g/10 min, and the low molecular weight ethylene-based interpolymer is heterogeneously branched linear or a homogeneously branched linear ethylene-based interpolymer, and has a density from 0.940 g/cc to 0.955 g/cc, and a melt index (I2) from 6 g/10 min to 50 g/10 min. The blend has a single peak in an ATREF profile eluting above 30° C., and has a coefficient of viscosity average molecular weight (CM?) less than −0.0032 in the log(calculated Mv) versus elution temperature, said CMv calculated in the range of elution temperatures from 70° C. to 90° C. The Mv is the viscosity average molecular weight. | 01-07-2010 |
20100255207 | DISPERSIONS OF HIGHER CRYSTALLINITY OLEFINS - Dispersions and methods for forming dispersions that include a higher crystallinity polyolefin and at least one persing agent are disclosed. Various applications for use of the dispersions are also disclosed. | 10-07-2010 |
20110178262 | METHOD FOR IMPROVING THE BUBBLE STABILITY OF A POLYETHYLENE COMPOSITION SUITABLE FOR BLOWN FILM EXTRUSION PROCESS - The instant invention provides a method for improving the bubble stability of a polyethylene composition suitable for blown film extrusion process. The method for improving the bubble stability of a polyethylene composition suitable for blown film extrusion process comprises the steps of: (1) providing a polyethylene composition having a density in the range of 0.900 g/cm | 07-21-2011 |
20120100357 | POLYETHYLENE RESINS FOR SHEET AND THERMOFORMING APPLICATIONS - This invention relates to coupling of polyethylene resins, more specifically coupling of polyethylene resins for use in extruded profiles, especially extruded profiles for sheet extrusion and cut sheet thermoforming applications and geomembranes. The process involves conveying a HDPE resin through an extruder, wherein the extruder comprises a feed zone, a first melt zone downstream of the feed zone, a second melt zone downstream of the first melt zone, and a third melt zone downstream of the second melt zone. The resin is melted in the first zone, contacted with oxygen in the second melt zone, and contacted antioxidant in the third melt zone. | 04-26-2012 |
20120238681 | EXTRUDER SCREW - Embodiments of the present disclosure include an extruder screw, ( | 09-20-2012 |
20120302681 | COMPOSITIONS, FILMS AND METHODS OF PREPARING THE SAME - The invention provides a composition comprising at least the following: A) a first composition comprising a first ethylene-based polymer, wherein the ratio, I | 11-29-2012 |
20130101847 | DISPERSIONS OF HIGHER CRYSTALLINITY OLEFINS - Dispersions and methods for forming dispersions that include a higher crystallinity polyolefin and at least one dispersing agent are disclosed. Various applications for use of the dispersions are also disclosed. | 04-25-2013 |
20130273369 | Method of Making a Cable Strength Member - Strength members for cable, particularly fiber optic cable, are made by a method comprising the steps of: A. Wetting a fiber, e.g., fiberglass fiber, with an aqueous polymeric dispersion to form a wetted fiber, the dispersion comprising: 1. At least one thermoplastic resin, e.g., a polyolefin; 2. At least one dispersing agent, e.g., a ethylene ethyl acrylate polymer; and 3. Water; B. Removing the water from the wetted fiber, and C. Consolidating the resin on the fiber with or without curing. | 10-17-2013 |
20140235769 | Process for Mixing Polyvinyl Chloride with a Bio-Based Plasticizer - Processes for making a polyvinyl chloride (PVC) dry blend composition with a phthalate-free, bio-based plasticizer and filler, having a bulk density of greater than 0.67 g/cc and an extrusion rate of greater than 65 gm/minute for a single screw extruder of 0.75 in barrel diameter with a 25:1 L:D general purpose polyethylene screw at 75 rotations per minute screw speed, and compositions made by the processes are provided. | 08-21-2014 |