Aromatic amorphous thermoplastic terpolymers

摘要

Described herein are amorphous thermoplastic terpolymers containing units of the formula: <IMAGE> (I) <IMAGE> (II) <IMAGE> (III) wherein R is independently hydrogen, C1 to C6 alkyl, or C4 to C8 cycloalkyl, X' is independently <IMAGE> wherein R1 and R2 are independently hydrogen or C1 to C9 alkyl; <IMAGE> wherein R3 and R4 are independently hydrogen or C1 to C8 alkyl and a1 is an integer of 2 to 7; -S-, -O-, or <IMAGE> a is an integer of 0 to 4 and n is independently an integer of 1 to 3. The units are attached to each other by an -0- bond. These polymers have an excellent combination of mechanical properties. They display high notched izod impact values, high heat distortion temperatures and excellent environmental stress crack resistance.