Polymer which is selected from the group consisting of the following subformulae: wherein R 1 and/or R 2 are selected from the following groups: a) the group consisting of primary alkyl or alkoxy with 1 to 30 C atoms, secondary alkyl or alkoxy with 3 to 30 C atoms, and tertiary alkyl or alkoxy with 4 to 30 C atoms, wherein in all these groups one or more H atoms are optionally replaced by F, b) the group consisting of -C -R 6, -C -O-R 6, -O-C -R 6, wherein R 6 is straight-chain, branched or cyclic alkyl with 1 to 30 C atoms, in which one or more non-adjacent C atoms are optionally replaced by -O-, -S-, -C -, -C -O-, -O-C -, - O-C -O-, -CR 0 =CR 00 - or -C≡C- and in which one or more H atoms are optionally replaced by F, Cl, Br, I or CN, c) the group consisting of aryl, aryloxy, heteroaryl and heteroaryloxy that is optionally alkylated or alkoxylated and has 4 to 30 ring atoms, R 3 is on each occurrence identically or differently F, Br, Cl, -CN, -NC, -NCO, -NCS, -OCN, -SCN, - C NR 0 R 00, -C X 0, -C 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, optionally substituted silyl, carbyl or hydrocarbyl with 1 to 40 C atoms that is optionally substituted and optionally comprises one or more hetero atoms, or P-Sp-, R 0 and R 00 are independently of each other H or optionally substituted C 1-40 carbyl or hydrocarbyl, P is a polymerisable or crosslinkable group, Sp is a spacer group or a single bond, X 0 is halogen, R 6 is straight-chain, branched or cyclic alkyl with 1 to 30 C atoms, in which one or more non-adjacent C atoms are optionally replaced by -O-, -S-, -C -, -C -O-, -O-C -, -O-C -O-, -CR 0 =CR 00 - or -C≡C- and in which one or more H atoms are optionally replaced by F, Cl, Br, I or CN; n is an integer > 1 and R 4, R 7 and R 8 have independently of each other one of the meanings of R 3. wherein R 1 and/or R 2 are selected from the following groups: a) the group consisting of primary alkyl or alkoxy with 1 to 30 C atoms, secondary alkyl or alkoxy with 3 to 30 C atoms, and tertiary alkyl or alkoxy with 4 to 30 C atoms, wherein in all these groups one or more H atoms are optionally replaced by F, b) the group consisting of -C -R 6, -C -O-R 6, -O-C -R 6, wherein R 6 is straight-chain, branched or cyclic alkyl with 1 to 30 C atoms, in which one or more non-adjacent C atoms are optionally replaced by -O-, -S-, -C -, -C -O-, -O-C -, - O-C -O-, -CR 0 =CR 00 - or -C≡C- and in which one or more H atoms are optionally replaced by F, Cl, Br, I or CN, c) the group consisting of aryl, aryloxy, heteroaryl and heteroaryloxy that is optionally alkylated or alkoxylated and has 4 to 30 ring atoms, a) the group consisting of primary alkyl or alkoxy with 1 to 30 C atoms, secondary alkyl or alkoxy with 3 to 30 C atoms, and tertiary alkyl or alkoxy with 4 to 30 C atoms, wherein in all these groups one or more H atoms are optionally replaced by F, b) the group consisting of -C -R 6, -C -O-R 6, -O-C -R 6, wherein R 6 is straight-chain, branched or cyclic alkyl with 1 to 30 C atoms, in which one or more non-adjacent C atoms are optionally replaced by -O-, -S-, -C -, -C -O-, -O-C -, - O-C -O-, -CR 0 =CR 00 - or -C≡C- and in which one or more H atoms are optionally replaced by F, Cl, Br, I or CN, c) the group consisting of aryl, aryloxy, heteroaryl and heteroaryloxy that is optionally alkylated or alkoxylated and has 4 to 30 ring atoms, R 3 is on each occurrence identically or differently F, Br, Cl, -CN, -NC, -NCO, -NCS, -OCN, -SCN, - C NR 0 R 00, -C X 0, -C 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, optionally substituted silyl, carbyl or hydrocarbyl with 1 to 40 C atoms that is optionally substituted and optionally comprises one or more hetero atoms, or P-Sp-, R 0 and R 00 are independently of each other H or optionally substituted C 1-40 carbyl or hydrocarbyl, P is a polymerisable or crosslinkable group, Sp is a spacer group or a single bond, X 0 is halogen, R 6 is straight-chain, branched or cyclic alkyl with 1 to 30 C atoms, in which one or more non-adjacent C atoms are optionally replaced by -O-, -S-, -C -, -C -O-, -O-C -, -O-C -O-, -CR 0 =CR 00 - or -C≡C- and in which one or more H atoms are optionally replaced by F, Cl, Br, I or CN; n is an integer > 1 and R 4, R 7 and R 8 have independently of each other one of the meanings of R 3.