| 摘要 |
<p>The invention relates to a polymer composition containing a polyimide (A) which comprises 3,3',4,4'-benzophenonetetracarboxylic dianhydride units and units of an aliphatic diamine or diisocyanate. The polymer composition according to the invention has the characteristic that it contains also a polyimide (B) which is essentially composed of units of a bifunctional carboxylic anhydride in accordance with formula (I), where R is chosen from the group comprising -C(O)-, -, -O-, -S- and -SO2-, and units of an aromatic diamine or diisocyanate. The glass transition temperature of the polymer composition is relatively high, as a result of which it is suitable for use in applications at high temperatures. It has been found that the polymer composition according to the invention has only one glass transition temperature, which indicates a homogeneously mixed polymer composition. In addition, the polymer composition can be processed thermoplastically very well.</p> |
