Patent ID: 8557953

Claim:
A polymer comprising at least one structural unit of the general formula (I) where the following applies to the symbols and indices used: Ar is an aryl, aryloxy, heteroaryl or heteroaryloxy group or an aromatic or heteroaromatic ring system, R 1 and R 2 are each, independently of one another, Ar 1 , H, D, F, Cl, Br, I, N(Ar 2 ) 2 , C(═O)Ar 2 , P(═O)Ar 2 2 , S(═O)Ar 2 , S(═O) 2 Ar 2 , CR 3 ═CR 3 Ar 2 , CN, NO 2 , Si(R 3 ) 3 , B(OR 3 ) 2 , OSO 2 R 3 , a straight-chain alkyl, alkoxy or thioalkoxy group having 1 to 40 C atoms or a branched or cyclic alkyl, alkoxy or thioalkoxy group having 3 to 40 C atoms, each of which optionally is substituted by one or more radicals R 3 , where one or more non-adjacent CH 2 groups optionally is replaced by R 3 C═CR 3 , C≡C, Si(R 3 ) 2 , Ge(R 3 ) 2 , Sn(R 3 ) 2 , C═O, C═S, C═Se, C═NR 3 , P(═O)(R 3 ), SO, SO 2 , NR 3 , O, S or CONR 3 and where one or more H atoms optionally is replaced by F, Cl, Br, I, CN or NO 2 , Ar 1 is selected on each occurrence, in each case independently of one another, from an aryl or heteroaryl group or an aromatic or heteroaromatic ring system, Ar 2 is an aryl, aryloxy, heteroaryl or heteroaryloxy group, R 3 is in each case, independently of one another, H or an aliphatic or aromatic hydrocarbon radical having 1 to 20 C atoms, where furthermore, if R 1 and R 2 both denote a radical Ar 1 , the compound of the formula (I) is then selected from the structures of the formulae (Ia), (Ib), (Ic) and (Id): where Ar 1 is on each occurrence identical or different, R 4 , R 5 , R 6 and R 7 each, independently of one another, have the meaning indicated for R 1 , where n≧1 and r=1, and where the bonds denoted by an asterisk represent the bonds to the adjacent structural units in the polymer.