LOW DENSITY AND HIGH DENSITY POLYETHERIMIDE FOAM MATERIALS AND ARTICLES INCLUDING THE SAME

摘要

Polyetherimide foam materials, articles that include these foam materials and methods of making these foam materials and articles. The foam extrusion process uses selected blowing agents, equipment design and processing conditions to produce continuously extruded foam with a substantially uniform cell size in a lower density PEI foam, such as 25 to 50 g/L or a higher density PEI foam, such as 120 to 300 g/L. Due to the greater densities that can be produced as well as the characteristics inherent in polyetherimide articles, the resulting foam materials are suitable for a much broader range of applications.