STERICALLY HINDERED DIAMINES AND POLYMERS PREPARED THEREFROM

摘要

The invention comprises diamines having a 5-t-butyl-1,3-benzene dicarboxylic moiety linked on both sides to phenylene diamine by an amide bond (tBuIPA-diamines). By reacting these diamines with aromatic difunctional acid derivatives amorphous polymers having high glass transition temperatures (Tg) can be prepared. If aliphatic diacid derivatives are used, the resulting polymers have a lower Tg, but have the advantage of melt-processability. The t-BuIPA diamines can also be used in the preparation of polyimides, being reacted with tri- or tetra-carboxylic anhydrides or with imide group-containing acid derivatives.