Patent ID: 6969755

Claim:
A random or block copolymer comprising at least two different units of general formula IV and/or V, wherein unit IV is of general formula and unit V is of general formula said copolymer including a first repeat unit selected from: (b) a unit of formula IV wherein E represents an oxygen atom, Eâ€² represents a direct link, Ar represents a moiety of structure (i), m represents zero, A represents 1, B represents zero; (d) a unit of formula V wherein E represents an oxygen atom, Eâ€² represents a direct link, Ar represents a moiety of structure (ii), m represents 0, C represents 1, D represents 0; and (e) a unit of formula V wherein E and Eâ€² represent an oxygen atom, Ar represents a structure (i), m represents 0, C represents 1, z represents 1, G represents a direct link, v represents 0 and D represents 1; and a second repeat unit selected from: (f) a unit of formula IV wherein E and Eâ€² represent oxygen atoms, G represents a direct link, Ar represents a moiety of structure (iv), m represents 1, w represents 1, s represents zero, A and B represent 1; and (h) a unit of formula V wherein E and Eâ€² represent oxygen atoms, G represents a direct link, Ar represents a moiety of structure (iv), m represents 1, z represents 1, v represents 0, C and D represent 1.