Polymers

A polymer comprising a repeating unit(s) of the formula

• wherein A is a 5-, 6-, or 7-membered heteroaromatic ring, containing at least one heteroatom selected from nitrogen, oxygen and sulfur, when A is 5-membered ring, A contains not more than 2 heteroatom,
• Ra, R1, R2, R3, R4, R1′, R2′, R3′ and R4′ are independently of each other hydrogen, halogen, or an organic substituent, or
• Ra, R1, R2, R3, R4, R1′, R2′, R3′ and R4′, if possible, together form an aromatic, or heteroaromatic ring, or ring system, which can optionally be substituted,
• R7 is halogen, or an organic substituent, wherein two or more substituents R7 in the same molecule may have different meanings, or can form together an aromatic, or heteroaromatic ring, or ring system, wherein
• at least one of Ra, R1, R2, R3, R4, R1′, R2′, R3′ and R4′ is a group R10, wherein
• R10 is a group -(Sp)x1-[PG′]<, wherein
• Sp is a spacer unit,
• PG′ is a group derived from a polymerisable group selecting from —C(R44)═CH2, —NHC(O)—C(R45)═CH2, —OCH2CH2OC(O)—C(R45)═CH2, —OC(O)—C(R45)═CH2, —C(O)—C(R46)═CH2, —C≡C—, —C≡, —OCH(CH2CH2CH═CH2)2;
• C5-C8cycloalkenyl, a substituted or unsubstituted bicycloalkenyl group having 5 to 30 carbon atoms,
• wherein
• s is an integer from 1 to 6, m1 is an integer from 1 to 6,
• R6 is hydrogen, or C1-C20alkyl,
• R44 is hydrogen, or C1-C4alkyl, or halogen,
• R45 is hydrogen, C1-C4alkyl, or halogen, and
• R46 is hydrogen, C1-C4alkyl, or C6-C12aryl, or
• PG′ is a group derived from a polymerisable group
• wherein
• AHG is an aromatic, or heteroaromatic residue
• R211 and R212 are independently of each other H, halogen, —C≡CH, boronic acid, or boronic esters, —Mg-Hal, —Zn-Hal, —Sn (R213)3, wherein Hal is halogen, and R213 is C1-C18alkyl,
• R214 and R214′ are independently of each other H, C1-C18alkyl, C1-C18alkyl which is interrupted by D, C1-C18perfluoroalkyl, C1-C18alkoxy, C1-C18alkoxy which is interrupted by D, or C7-C25aralkyl,
• x1 is 0, or 1, and
• x is 0, or an integer of 1 to 4.