Polyester film backing

Duragesic is a transdermal patch that delivers the potent opioid analgesic fentanyl. The life span of the patch is three days and it is manufactured in five sizes 12,25, 50, 75, and 100pg/h. Duragesic is a membraned-moderated patch and consists of four patch layers a backing layer of polyester film, a drug reservoir that contains fentanyl, and U.S. Pharmacopeia (USP) alcohol gelled with hydroxyethyl cellulose,... 

Because the glass-to-EVA interface bonding problem seemed to be solved when all samples exhibited adherent and persistent bonds, the focus of the effort was shifted to back-sheet adhesion. An additional series of test (see Table II) confirmed the good results of Tedlar with the Du Pont adhesive 68040. Korad 63000 may be a useful material, but cure temperatures during lamination caused some degradation. Additional tests on this acrylic sheet may be run. A polyester film, Scotchpar 20CP, was interesting, because it would be less expensive than a polyvinyl fluoride film, such as Tedlar. This test series showed that a new primer or adhesive was needed for the Scotchpar film. 

The M295 Decontamination Kit, Individual Equipment (DKIE) consists of a pouch containing four wipedown mitts, each enclosed in a soft protective packet (Figure 16-38). Each wipedown mitt is made of a dry, adsorbent, black resin (the same as in the M2 91 kit) contained within a nonwoven polyester material and a polyethylene film backing. This kit allows decontamination of exposed areas of the protective mask and hood, personal equipment, and protective boots. Decontamination is... 

Nonwoven materials are used extensively for drapes and cover cloths and are composed of films backed on either one side or both sides with nonwoven fabrics. The film is completely impermeable to bacteria while the nonwoven backing is highly absorbent to both body perspiration and secretions from the wound. Hydrophobic finishes may also be applied to the material in order to achieve the required bacteria barrier characteristics. The developments in surgical drapes have led to the use of loop-raised, warp-knitted polyester fabrics that are laminated back to back and contain micropo-rous PTFE films in the middle for permeability, comfort, and resistance to microbiological contaminants. 

The history of thermoplastic polyester goes back to 1929 with the pioneering work of Carothers. The first aromatic polyester of importance is poly(ethylene terephthalate) commonly abbreviated PET (or PETE) and was prepared by Whinfield and Dickson. In 1941, they created the first polyester fibers called Terylene and first manufactured by Imperial Chemical Industries (ICI). PET was produced commercially in 1953 as fiber for textile industry (Dacron) by Dupont using modified nylon technology. Dupont polyester research rapidly leads to a whole range of trademarked products as Mylar, a strong polyester film. 

Pressure sensitive masscoats are applied to backings such as paper, polyester film, PVC,... 

Pressure sensitive tapes and labels are offered with a variety of backing materials such as crepe paper, aluminum foil, fabric, cellophane, kraft paper, cellulose acetate, polyester film, polyethylene, polypropylene, plasticized poly (vinyl chloride), woven glass fiber cloth, or other flexible materials. Pressure sensitive adhesives may be applied from solvent, latex, hot melt, or radiation cured 100% solids systems. A wide variety of coating methods are utilized such as roll coating, calendering, slot die, and transfer coating. 

Silicone PSAs find application almost exclusively in tape form. Polyester film is widely used as backing particularly for masked printed circuit boards during plating operations, for electrical insulation and paper splicing tapes. Glass cloth-backed tapes are preferred for... 

One of the most commonly used back-contact membranes is TPT [97]. T represents polytetrafluoroethylene membrane (PVF membrane, most commonly used Tedlar ). It has the following functions solar cell sealing, anti-aging, UV resisting and water proofing. P represents polyester film PET that obstructs the water moisture, which is electrically insulated. TPT consists of three thin membranes. The two external membranes are all T membranes, while the internal is P membrane. 

Pressure sensitive adhesives can be coated on a substrate such as a polyester or paper backing to make a tape or label, or on a release liner to make a transfer adhesive, or a special substrate to make a graphic film or retro-reflective sheeting product. In some cases, where precision placement of the PSA is required, one may also coat directly on the substrate using techniques such as screen-printing. 

This stretching, similar to the drawing of fibres, which promotes orientation and crystallite formation, is called biaxial orientation. It gives the film added strength and gas-barrier properties. In some processes, monoaxial (uniaxial) drawing is employed, e.g., polypropylene, which is then slit into thin strips and fabricated into heavy duty sacks, carpet backing, etc. The stenter process is used to make biaxial oriented poly(vinylidene dichloride) ("ding" film), polyester, polyamide and polypropylene films. 

Figure 65 SEM images (a) and (b) cross-sections of the good package white backing film, (c) and (d) cross-sections of the bad package white backing film. (A) Outer clear polyester layer, (B) tie layer, (C) middle opaque polyethylene layer, and (D) EVA heat seal layer.

The electronic ink is supplied by E ink corporation (Comiskey 1998). The film consists of electrophoretic microcapsules in a polymer binder, coated on to a 25 pm polyester/indium tin oxide sheet (Fig. 14.10). Optical contrast is achieved by moving black and white sub-micron particles with opposite charge in a transparent fluid within a microcapsule. Depending on which sub-micron particles are closest to the viewer, light is scattered back (white state) or absorbed (black state). The electrophoretic effect is multi-stable - without any electric field the microcapsules keep their switching state. This greatly reduces the power consumption of the display (Ritter 2001). 

---