NOVELTY - Polymer containing at least one oligo-triarylamine repetition units (I) is new.    USE - The polymer is useful in electronic or optoelectronic device including organic electroluminescent devices, organic light-emitting electrochemical cells, organic FET, organic integrated circuits, organic thin film transistors, organic solar cell, organic laser diodes, organic photovoltaic elements or devices and organic photoreceptor (claimed).    ADVANTAGE - The polymer can be produced with less effort, and provides the improved service life and efficiency to the electronic or optoelectronic device.    DETAILED DESCRIPTION - Polymer containing at least one oligo-triarylamine repetition units of formula (I) is new.    Ar1-Ar5 = mono-or polycyclic 5-60 membered aryl or heteroaryl ring, which is optionally substituted by radical R;    R = linear 1-40C-alkyl or -(thio)alkoxy, branched or cyclic 3-40C-alkyl or -(thio)alkoxy (which is optionally substituted by one or more radicals R1), H, D1, F, Cl, Br, I, N(R1)2, CN, NO2, Si(R1)3, B(OR1)2, C(=O)R1, P(=O)(R1)2, S(=O)R1, S(=O)2R1, OSO2R1, where one or more non-adjacent CH2 groups are optionally replaced by R1C=CR1, -CC-, Si(R1)2, C=O, C=S, C=NR1, P(=O)(R1), SO, SO2, NR1, O, S or CONR1, and one or more H atoms are optionally replaced by D1, F, Cl, Br, I or CN, mono-or polycyclic membered 5-60 aryl or heteroaryl ring (which is optionally substituted by one or more radicals R1), 5-60 membered (hetero)aryloxy (which is substituted by one or more radicals R1), 5-60 membered (hetero)aralkyl (which is substituted by one or more radicals R1), or 10-40 membered diarylamino, -diheteroarylamino or -arylheteroarylamino, which are substituted by one or more radicals R1, or a cross-linkable group Q, where two or more radicals R form mono-or polycyclic, aliphatic, aryl and/or benzo-fused ring system;    R1 = H, D1, F or 1-20C aliphatic hydrocarbyl, aryl and/or heteroaryl hydrocarbyl having 5-20C, in which one or more H atoms are optionally replaced by F, where two or more substituents R1 form mono-or polycyclic, aliphatic or aryl ring system; and    n = 1-3, where the dotted lines represent bonds to adjacent structural units in the polymer, provided that when i is 0 and j is 1, Ar2 and/or Ar4 in at least one, preferably in one of the two ortho-positions is substituted with Ar6, where Ar6 is mono-or polycyclic 5-60 membered (hetero)aryl ring system (which is substituted by one or more radicals R), and when i is 1 and j is 0, Ar4 and/or Ar5 in at least one, preferably in one of the two ortho-positions is substituted with Ar6, where Ar6 is mono-or polycyclic 5-60 (hetero)aryl ring system (which is substituted by one or more radicals R); and    i, j = 0-1, where the sum of i+j is 1.    INDEPENDENT CLAIMS are included for:    (1) preparing the polymer; and    (2) a polymer blend comprising the polymers and one or more further polymeric, oligomeric, dendritic and/or low molecular weight substances.