Patent ID: 7790057

Claim:
A polymer containing units of the formula (I) in which R is on each occurrence, identically or differently, H, a straight-chain alkyl chain having 1 to 40 C atoms, a branched alkyl chain having 3 to 40 C atoms or a cyclic alkyl chain having 3 to 40 C atoms, each of which is optionally substituted by R 1 and in which, in addition, one or more non-adjacent C atoms is optionally replaced by ═N—R 1 , —O—, —S—, —O—CO—O—, —CO—O—, —CR 1 ═CR 1 — or —C≡C— and in which, in addition, one or more H atoms is optionally replaced by F, Cl, Br, I or CN, or an aromatic ring system having 5 to 40 C atoms or a heteroaromatic ring system having 2 to 40 C atoms, which is optionally substituted by one or more radicals R 1 ; the two radicals R here optionally form a further mono- or polycyclic, aromatic or aliphatic ring system with one another; R 1 is on each occurrence, identically or differently, H, a straight-chain alkyl chain having 1 to 22 C atoms, a branched alkyl chain having 3 to 22 C atoms or a cyclic alkyl chain having 3 to 22 C atoms, in which, in addition, one or more non-adjacent C atoms is optionally replaced by ═N—R 2 , —O—, —S—, —O—CO—O—, —CO—O—, —CR 2 ═CR 2 — or —C≡C— and in which, in addition, one or more H atoms is optionally replaced by F, Cl, Br, I or CN, or an aryl, heteroaryl, aryloxy or heteroaryloxy group having 5 to 40 C atoms, which is optionally substituted by one or more non-aromatic radicals R 1 ; two or more of the radicals R 1 here optionally form a ring system with one another and/or with R; or F, Cl, Br, I, CN, N(R 2 ) 2 , Si(R 2 ) 3 or B(R 2 ) 2 ; R 2 is on each occurrence, identically or differently, H or an aliphatic or aromatic hydrocarbon radical having 1 to 20 C atoms; X is on each occurrence, identically or differently, B, C, N, O, P, S, Se, P═O, S═O or SO 2 ; n is on each occurrence, identically or differently, 0, 1, 2 or 3; m is on each occurrence, identically or differently, 0, 1 or 2; and the dashed bond denotes the link in the polymer and with the proviso that if X is O then there are no Rs present and if X is N or B, then there is only one R present and if X is S or P═O then there can be no Rs present.