Clearing polyesters

Figure 63 Scanning electron micrographs of the failure surface of the white backing layer of the bad packaging sample. Four layers were clearly visible in the SEM images. They are labeled as follows (1) outer clear polyester layer, (2) middle opaque polyethylene layer,... 

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.

Clear polyester sheet stock and rods are available13 and, like reinforced polyester plastic, may be drilled, sawed, and machined. This clear plasic is harder than poly(methyl methacrylate) and much more solvent resistant than either po-lyfmethyl methacrylate) or polystyrene. As with all thermosetting plastics, it may not be heat-formed or solvent-bonded. However, bonding with epoxy cements is satisfactory. This plastic is claimed to give continuous service at 80°C and intermittent service up to 150°C. 

Emkaclear. [Emkay] For fixing and clearing polyester dyes. 

Clear Polyesters—1 and 2 mil clear durable polyester film suitable for outdoor use... 

AS-144) 1.5 mils Polyester carrier film 2.0 mils ARclear Adhesive (AS-144) 1.5 mils Clear polyester liner 2.0 mils 20 oz/in Liner 2 20 gm/2 width... 

A large variety of hyperbranched polymers with acrylate, vinyl ether, allyl ether, or epoxy functions were studied as multifunctional cross-linkers in coatings and in thermosets, using thermal as well as UV curing methods Clearly, polyesters are most prominent in the field, with the Perstorp Boltom products leading in technical studies. The commercialized poly(esteramide)s from DSM, sold under the trade name Hybrane polyethylenimines from BASF AG, available under the trade name TupasoF and poly(urethane)s (PUs) and polyesters developed by BASF are examples for hyperbranched polymers suited for coatings and resin products. 

S. M. Mirabedini, A. Kiamanesh, The effect of micro and nano-sized particles on mechanical and adhesion properties of a clear polyester powder coating. Prog. Org. Coat. 76 (2013) 1625-1632. 

---