ULDPE resin

Two distinct regions can be easily identified in Figure 2.3 a sharp high-crystallinity peak (low a-olefin fraction) and a broad low-crystallinity peak (high a-olefin fraction). These two regions are associated with at least two types of active sites, one with a much lower reactivity ratio toward incorporation of a-olefin than the other. As the relative fractions of polymer under these two modes is varied, we go from HDPE - with a unimodal, high-crystallinity peak and sometimes a small, lower crystalHnity tail - to LLDPE, VLDPE and ULDPE resins, having a very pronounced lower crystallinity peak, which may, sometimes, show additional peaks. 

Dow ABS Nylon 6/6 Polycarbonate Polyethylene, HDPE, LDPE, LLDPE, ULDPE Polypropylene HPPP, CPPP Polystyrene HIPS, GPPS, Recycled, Advanced Styrenic Resin SAN Polyurethane Elastomers Polyolefin Plastomer PC/ABS Crystalline Polymer ABS/TPU... 

Figure 18,2 d) illustrates the general structure of very low density polyethylene, which we also call ultra low density polyethylene. In common with linear low density polyethylene, these resins are copolymers of ethylene and 1-alkenes. The comonomer level ranges from approximately 8 to 14 mole %. We normally refer to these polymers as VLDPE or ULDPE. The molecules of very low density polyethylene contain a distribution of lengths and branch placements. 

PS PSF PSU PTFE PU PUR PVA PVAL PVB PVC PVCA PVDA PVDC PVDF PVF PVOH SAN SB SBC SBR SMA SMC TA TDI TEFE TPA UF ULDPE UP UR VLDPE ZNC Polystyrene Polysulfone (also PSU) Polysulfone (also PSF) Polytetrafluoroethylene Polyurethane Polyurethane Poly(vinyl acetate) Poly(vinyl alcohol) poly(vinyl butyrate) Poly(vinyl chloride) Poly(vinyl chloride-acetate) Poly(vinylidene acetate) Poly(vinylidene chloride) Poly(vinylidene fluoride) Poly(vinyl fluoride) Poly(vinyl alcohol) Styrene-acrylonitrile copolymer Styrene-butadiene copolymer Styrene block copolymer Styrene butadiene rubber Styrene-maleic anhydride (also SMC) Styrene-maleic anhydride (also SMA) Terephthalic acid (also TPA) Toluene diisocyanate Ethylene-tetrafluoroethylene copolymer Terephthalic acid (also TA) Urea formaldehyde Ultralow-density polyethylene Unsaturated polyester resin Urethane Very low-density polyethylene Ziegler-Natta catalyst... 

UF. See Urea-formaldehyde resin Uinlahite Uintaite. SeeGilsonite ULDPE. See Polyethylene, very low-density... 

When a lower seal initiation T is needed in fast packaging line, AFFINITY should be used instead of DOWLEX PE, Attane ULDPE, or Elite EPE resins... 

These linear elastomers are produced by coordination polymerization using a Phillips or Z-N catalyst at low P and T. Here belongs Mxsten XLDPE from Eastman Chem. and Attane ULDPE from Dow. The first metallocene-catalyzed VLDPE was a hexene copolymer with p = 0.912 g mL made in the UNIPOL gas-phase process with Z-N catalyst and introduced by ExxonMobil as Exceed metallocene VLDPE. The resin has outstanding sealing properties (hot tack and seal strength) compared with ZN-VLDPE. The solution polymerization in a hydrocarbon usually is carried out in a continuously stirred tank reactor (CSTR), at r = 160-300 °C and P = 2.5-10 MPa with the residence time of 1-5 min [Dow in 1992 and UCC in... 

ULDPE and VLDPE resins find application in low temperature applications, such as ice bags, where lower density offers greater toughness. They are also used as sealing layers, replacing low density copolymers such as vinyl acetate, and as blend components to improve toughness. 

ASP Water-washed kaolin, Engelhard Aspun Fiber grade resins, Dow Astrawax Amide wax, additive lubricant, AlliedSignal Adac Thermoset polyester, Reichhold Attain ULDPE, Dow Aurum Polyimide resin, Mitsui Auto-Grader Online melt flow indexer, Brabender Autofiroth Pressurized rigid froth polyurethane foam systems, BASF Autoguage Automatic die. 

Metallocene polyethylene (mPE) plastomers 0.900-0.915 Coextrusion, heat seal layers Ethylene-vinyl acetate (EVA) resins with 9% vinyl acetate, ultra low density polyethylene (ULDPE), very low density polyethylene (VLDPE)... 

ELITE resins can provide the heat seal initiation of EVA and ULDPEs with a modulus that compares to that of an LDPE. This translates to an increase in modulus of up to 100% versus straight EVA or ULDPE. 

ELITE resins deliver the heat seal initiation temperature of an EVA or ULDPE, and a Vicat softening point comparable to or better than that of LLDPE. 

The present PE and polypropylene prices still do not allow for acceptable margins under the current market conditions. Based on this situation, Dow Plastics announced a price increase in Europe of 100 per metric tonne above January 2003 pricing levels for all polypropylene resins. Inspire performance polymers, LDPE resins and HDPE resins, Dowlex LLDPE resins, Attane ULDPE copolymers. Elite enhanced PE resins, and Aspun fibre grade resins. 

The incorporation of extremely high levels of comonomer can reduce the degree of crystallinity, and hence the resin density, to levels well below that of low density polyethylene. Such products are variously termed ultralow density or very low density polyethylene (ULDPE and VLDPE, respectively). These materials are flexible, clear, and elastomeric. They can be used neat or blended into other polymers as impact strength and clarity modifiers. 

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