Patent ID: 8529794

Claim:
A polymer of the formula wherein one of X 1 and X 2 is Se and the other is S or Se, R 1 and R 2 are each independently H, halogen, —CN, —NC, —NCO, —NCS, —OCN, —SCN, —C(═O)NR 0 R 00 , —C(═O)X 0 , —C(═O)R 0 , —NH 2 , —NR 0 R 00 , —SH, —SR 0 , —SO 3 H, —SO 2 R 0 , —OH, —NO 2 , —CF 3 , —SF 5 , P-Sp-, optionally substituted silyl, or carbyl or hydrocarbyl with 1 to 40 C atoms that is optionally substituted and optionally comprises one or more hetero atoms, R 3 and R 4 independently of each other have one of the meanings of R 1 or are —CH 2 Cl, —CHO, —CH═CH 2 —SiR′R″R′″, —SnR′R″R′″, —BR′R″, —B(OR′)(OR″), —B(OH) 2 , or P-Sp, wherein R′, R″ and R′″ independently of each other have one of the meanings of R 0 and R′ and R″ may also form a ring together with the hetero atom to which they are attached, P is a polymerizable group, Sp is a spacer group or a single bond, X 0 is halogen, R 0 and R 00 are independently of each other H or an optionally substituted aliphatic or aromatic hydrocarbon group having 1 to 20 C atoms, Ar in case of multiple occurrence independently is selenophene-2,5-diyl, thiophene-2,5-diyl, thieno[3,2-b]thiophene-2,5-diyl, thieno[2,3-b]thiophene-2,5-diyl, selenopheno[3,2-b]selenophene-2,5-diyl, selenopheno[2,3-b]selenophene-2,5-diyl, selenopheno[3,2-b]thiophene-2,5-diyl, selenopheno[2,3-b]thiophene-2,5-diyl, 1,4-phenylene, pyridine-2,5-diyl, pyrimidine-2,5-diyl, p-p′-biphenyl, naphthalene-2,6-diyl, benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl, 2,2-dithiophene, 2,2-diselenophene, thiazole and oxazole, all of which are mono- or polysubstituted by R 1′ R 1′ is halogen, —CN, —NC, —NCO, —NCS, —OCN, —SCN, —C(═O)NR 0 R 00 , —C(═O)X 0 , —C(═O)R 0 , —NH 2 , —NR 0 R 00 , —SH, —SR 0 , —SO 3 H, —SO 2 R 0 , —OH, —NO 2 , —CF 3 , —SF 5 , P-Sp-, optionally substituted silyl, or carbyl or hydrocarbyl with 1 to 40 C atoms that is optionally substituted and optionally comprises one or more hetero atoms, m is 1, 2, 3 or 4, and n is an integer>10.