High molecular weight HDPE

High molecular weight HDPE (HMW-HDPE) is used for blown film and for demanding moulding and structural uses. Examples are blow moulded drums for packing dangerous chemicals and pressure piping. 

All of the organohalogen compounds studied were commercial products obtained from various manufacturers and used as received. Only the DBDPO was purified further by recrystallization for some of the chromatography and thermal analysis experiments. Samples of antimony trioxide and antimony pentoxide were also obtained from commercial sources. The ultrapure antimony trioxide, bismuth trioxide, bismuth metal, antimony metal, dibenzofuran and diphenyl ether were all obtained from Aldrich Chemicals. The poly(propylene) (PP) resin was 0.7 mfi, food grade from Novamont and the poly(ethylene) was unstabilized, high molecular weight, HDPE from American Hoechst. 

Processing Stability for High Density Polyethylene (HDPE). The specific polymer used in the test described below was a high molecular weight HDPE made by BASF Lupolen 5260 Z. The following test runs were carried out by the test laboratories of CIBA-GEIGY Corporation Basle, Switzerland. 

High density/weight, 61 High temperature loss, 61, 306 High viscosity of hot melt, 62 High-density boards, 209 High-molecular weight HDPE (HMW-HDPE), 52... 

PPE with styrenics and high molecular weight HDPE... 

High molecular weight HDPE is increasingly being used for drums, pails, totes, and similar shipping containers, as an alternative to steel and fiherboard. Plastic drums are often used for chemicals, and are also used frequently in the food-processing industry. Standard drum sizes in North America are 57, 76, 114, 132, 208, and... 

With the advent of very high molecular weight HDPE for applications such as large rigid blow-moulded containers, there was an impetus to improve the forwarding efficiency of the extruder feed zone as the feed material was a low coefficient of friction powder/crumb, with a bulk density less than other polyolefines. 

EVA, ethylene vinyl acetate copolymer UHMWHDPE, ultra high molecular weight HDPE. Source Ref. 70. 

High-molecular weight HDPE (0.25-1.5 x 10 g/ mol) are also produced as well as ultrahigh-molecular weight HDPE (>1.5 X 10 g/mol), which has the highest abrasion resistance and impact strength. 

HDPE pipe resins offer the superior toughness and stress crack resistance essential for pipe extrusion, while high molecular weight HDPE (HMWHDPE) film resins provide toughness and downgauging capabilities for products such as thin-gauge carrier bags, bin liners, and refuse sacks. 

W.D. Heitz, Paraloid extrusion aids for high molecular weight hdpe film resins, US Patent 4963622, assigned to Union Carbide c3remicals and Plastics Company Inc. (Danbury, CT), October 16,1990. 

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