Patent ID: 8420750

Claim:
A copolymer (C) comprising recurring units (A) of the general structural formula: -D-G-Ar b -G- and recurring units (B) of the general structural formula: —Ar a -G-Ar b -G- wherein: D is at least one dibenzodiazocine-containing divalent group; Ar a is at least one dibenzodiazocine-free divalent group selected from the group consisting of: C 12 -C 50 divalent groups (GS) containing at least one sulfone unit [—S(═O) 2 —] and at least two C 6 -C 40 arylene units; C 12 -C 50 divalent groups (GK) containing at least one ketone unit [—C(═O)—] and at least two C 6 -C 40 arylene units; and mixtures of these groups; each Ar b is at least one dibenzodiazocine-free divalent group selected from the group consisting of C 6 -C 50 arylene groups and C 12 -C 50 aromatic hydrocarbon groups of the general formula (I): wherein the unassigned positional isomer is either meta or para to Q, and Q is a direct covalent bond or a divalent group containing from 0 to 38 carbon atoms, the Ar b being independently chosen from each other; and each G is at least one divalent group selected from the group consisting of ether groups (—O—) and thioether groups (—S—), the G being independently chosen from each other.