Conjugated polymers

A process for partially or fully detaching the carbonate or carbamate groups in a conjugated polymer comprising heating the polymer or a layer comprising the polymer to a temperature in the range of from 150° C. to 200° C.,

• wherein the conjugated polymer comprises one or more identical or different repeat units of formula (I):
• wherein:
• Ar is a mono- or polycyclic aryl or heteroaryl radical which is optionally substituted at one or more positions;
• Sp1 is a single bond or alkylene radical having 1 to 20 carbon atoms and is unsubstituted or mono- or polysubstituted by F, Cl, Br, I or CN, and wherein one or more nonadjacent CH2 groups are each optionally independently replaced by —O—, —S—, —NH—, —NR0—, —SiR0R00—, —CO—, —COO—, —OCO—, —OCO—O—, —S—CO—, —CO—S—, —CR0═CR00—, or —C≡C— such that no oxygen and/or sulfur atoms are directly bonded to one another;
• X1 is NR0 or O;
• wherein, if the Sp1-X1—C(O)—OR1 radical is bonded to a nitrogen atom in the Ar radical, the Sp1-X1 radical may also be a single bond,
• R0 and R0
• are each independently H or an alkyl group having 1 to 12 carbon atoms;
• and
• R1 is a hydrocarbyl radical having 1 to 40 carbon atoms,
• with the proviso that the repeat units of the formula (I) excludes
• repeat units wherein Ar is a phenylene radical that is mono-or polysubstituted by —NH—C(O)—OR1 and wherein, in the polymer backbone, is directly adjacent to an optionally substituted benzo[lmn][3,8]phenanthroline-1,3,6,8-tetraone-4,9-diyl unit, and
• repeat units wherein Ar is pyrrolo[3,4-c]pyrrole-1,4-dione-3,6-diyl, wherein both nitrogen atoms are substituted by —C(O)—OR 1.