Patent ID: 7183418

Claim:
A monomer, oligomer or polymer of formula I -[(A) a —(B) b —(C) c —(D) d ] n — I wherein A and C are, independently of each other in each case, a group of formula II R 1 and R 2 are, independently of each other, H, halogen, or a straight chain, branched or cyclic alkyl with 1 to 20 C-atoms, which is unsubstituted, mono- or poly-substituted by F, Cl, Br, I, OH or CN, in which one or more non-adjacent CH 2 groups are optionally replaced, in each case independently from one another, by —O—, —S—, —NH—, —NR 0 —, —SiR 0 R 00 —, —CO—, —COO—, —OCO—, —OCO—O—, —S—CO—, —CO—S—, —CH═CH— or —C≡C— in such a manner that O and/or S atoms are not linked directly to one another, or are optionally substituted aryl or heteroaryl, P—Sp—or P—Sp*—, P is a polymerisable or reactive group, P* is a group that can be converted to or substituted by a polymerisable or reactive group P, Sp is a spacer group or a single bond, R 0 and R 00 are, independently of each other, H, aryl or alkyl with 1 to 12 C-atoms, B and D are, independently of each other in each case, —CX 1 ═CX 2 —, —C≡C— or an arylene or heteroarylene group that is optionally substituted with one or more R 1 groups, X 1 and X 2 are, independently of each other, H, F, Cl or CN, a, b, c, d are, independently of each other, 0 or an integer of 1 to 10, with a+b+c+d>0, and wherein in at least one recurring unit [(A) a —(B) b —(C) c —(D) d ] at least one of a and c is 1 and at least one of b and d is 1, and n is an integer ≧1, wherein the recurring units [(A) a —(B) b —(C) c —(D) d ] are identical or different, and with the proviso that if a is 1, then —(B) b —(C) c —(D) d — is different from —CH═CH—Ar—CH═CH—, with Ar being 2,5-thiophene, 1,4-phenylene or 2,5-dimethoxy-1,4-phenylene, or the compounds comprise at least one group P—Sp—or P*—Sp—.