PEN resin

Since it is also a poly condensation polymer, the preparation of PEN from dimethyl 2,6-naphthalenedicarboxylate (NDC) is similar to the preparation of PET from dimethyl 1,4-terephthalate (DMT) by combining a diacid ester (NDC) with ethylene glycol. In view of the fact that the commercial-scale production of PEN resin starts with 2,6-NDC, the production process is similar to that used for the production of PET from DMT. There are two main steps for the process (Scheme 10.1) [11]. 

Figure 10.2 Manufacturing process used to produce PEN resin...

The amorphous PEN resin pellets are first dried at 180 °C and then extruded at 290-300 °C through a die, formed into a sheet, which is then followed by a two-step orientation (forward draw and sideway draw process) just above the glass transition temperature (Tg) (>120°C). After the orientation process, the PEN film is conveyed between rollers at 210-220 °C to induce crystallization. At the end of the orientation and crystallization process, the film is cut and rolled into widths and lengths to suit individual customers [14-16], Two of the process used to produce such films are shown in Figure 10.3. 

General Description Polyethylene napthalate (PEN) resin can be processed into films, fibers, and containers.Biaxially oriented PEN films offer improved physical properties when compared with Opet.11055]... 

Hipertuf, PEN resin, Shell Chemicals Hipscon, Conductive HIPS sheet, BFGoodrich Co., Static Control Polymers HiSorb, Sorption material for chemicals/petrole-um, HiTech Polymers Hitone, Pigments, Datacolor Corp. 

The melt rheology of PEN resin is significantly higher than that of PET even at lower inherent viscosities (IVs) and/or higher temperatures. The rheology of PEN at an IV typically produced in a melt-phase polymerization (0.49-0.53) was... 

Hipertof PEN resin. Shell Hipscon Conductive HIPS sheet, BFGoodrich... 

Polyethylene naphthalate (PEN), a relatively new polyester, is part of the PET family and has a great potential as a resin for bottles. PEN resin is more opaque, shows five times lower oxygen and carbon dioxide permeability coefficients, has a higher glass transition temperature, is stronger, and is stiffer than PET. This makes it more suitable for hot fiUing and a excellent material for carbonated beverages. Bottles made of PEN provide the product with additional ultraviolet protection. PEN bottles can be returnable, refiUable, and re-... 

PEN resin in pellets form (X-10 PEN homopolymer, intrinsic viscosity 0.79 ml/g) was obtained from Excell LLC and dried at 150°C for more than 24 hrs. It was mixed with 0, 1, 3 and 5 wt% of graphite (surface enhanced flake graphite, Asbury Carbons) and transferred into recirculating conical twin screw extruder (Microcompounder, DACA Instruments) or 16 mm corotating twin screw extruder (Prism TSE 16TC) controlled... 

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