Ultem polyimides General Electric

Thermoplastic Condensation Polyimides. These include General Electric s Ultem Resin and Amoco s Todon polyamideimide although the latter is no longer offered as injection moldable pellets, but as compression moldable powder and in solution. Another resin, P-84, originally developed by Upjohn but now made by Lenzing (Austria), is based on benzoquinone dianhydride and aromatic isocyanates. 

Aromatic polyimides are well recognized to have excellent chemical stability, so they have found applications in extremely harsh and corrosive environments. For example, they are used as insulators in nuclear facilities and as thermal blankets on spacecraft where the materials may be exposed to high-energy radiation in the presence of oxygen. The best known of the commercial polyimides is Kapton, which is marketed by Du Pont. The chemical structure of Kapton is shown in Figure 1, along with that of Ultem, another commercial polyimide marketed by General Electric. 

The best-known are General Electric Ultem poly (ether imides) these offer heat deflection temperatures of 207 to 221°C and continuous service temperatures of 170 to 180°C. Also popular are Amoco Torlon polyamide-imides, with heat deflection temperatures of 278 to 282°C. More specialized are Ciba-Geigy trimethyl phenyl indane polyimides, with heat deflection temperatures of 232 to 257°C, embrittlement times of >2000 hr at 200°C... 

Ultem 1000 26 (Fig. 13) marketed by General Electric is a poly(ether-imide) representative of a series of thermoplastic polyimides that can be used as adhesives or moulding materials for applications at moderate temperatures T = 220°C). 

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