NOVELTY - Polymer (P1) comprising repeating units having benzo(1,2-d;4,3-d)bisthiazole moiety (I), is new.    USE - In blend and formulation as charge transport, semiconducting, electrically conducting, photoconducting or light emitting material in optical, electrooptical, electronic, electroluminescent or photoluminescent components or devices; in optical, electro-optical or electronic component or devices selected from organic field effect transistors (OFET), thin film transistors (TFT), integrated circuits (IC), logic circuits, capacitors, radio frequency identification (RFID) tags, devices or components, organic light emitting diodes (OLED), organic light emitting transistors (OLET), flat panel displays, backlights of displays, organic photovoltaic devices (OPV), solar cells, laser diodes, photoconductors, photodetectors, electrophotographic devices, electrophotographic recording devices, organic memory devices, sensor devices, charge injection layers, charge transport layers or interlayers in polymer light emitting diodes (PLEDs), Schottky diodes, planarizing layers, antistatic films, polymer electrolyte membranes (PEM), conducting substrates, conducting patterns, electrode materials in batteries, alignment layers, biosensors, biochips, security markings, security devices, and components or devices for detecting and discriminating DNA sequences; and in bulk heterojunction OPV device (claimed).    ADVANTAGE - The polymer exhibits improved processability and high solubility in organic solvents, and thus is suitable for large scale production using solution processing method; and exhibits low bandgap, high charge carrier mobility and high oxidative stability.    DETAILED DESCRIPTION - Polymer (P1) comprising repeating units having benzo(1,2-d;4,3-d)bisthiazole moiety of formula (I), is new.R1 and R2=carbyl or hydrocarbyl (both optionally substituted), H, or halo.    INDEPENDENT CLAIMS are included for the following:    (1) mixture or blend comprising the polymers and at least one compound or polymer having semiconducting, charge transport, hole/electron transport, hole/electron blocking, electrically conducting, photoconducting or light emitting properties;    (2) formulation comprising the polymers, the mixtures or blends, and at least one solvent, preferably selected from organic solvent;    (3) optical, electro-optical or electronic component or device comprising the polymers, mixtures, blends or formulations;    (4) new monomer (A1) intermediate of formula R4-Ar1-U'-Ar2-R5; and    (5) preparation of the polymer (P1).    U'=moiety of formula (I);    Ar1 and Ar2=T1;    T1=aryl or heteroaryl (both optionally substituted by R3);    R3=silyl, carbyl or hydrocarbyl (all optionally substituted with 1-40C atoms that is optionally substituted and optionally comprises hetero atom or P'-Sp'-), F, Br, Cl, -CN, -NC, -NCO, -NCS, -OCN, -SCN, -C(O)NR'R'1, -C(O)X', -C(O)R', -NH2, -NR'R'1, -SH, -SR', -SO3H, -SO2R', -OH, -NO2, -CF3, or -SF5;    R' and R'1=1-40C carbyl or hydrocarbyl (both optionally substituted);    P'=polymerizable or crosslinkable group;    Sp'=spacer group or a single bond;    X'=halo;    R4 and R5=R3, -CH2Cl, -CHO, -CH=CH2, -SiR'2R3R'4, -SiX'1X'2, -SiR'2R'3R'4X'1, -SnR'2R'3R'4, -BR'2R'3, -B(OR'2)(OR'3), -B(OH)2, O-SO2-R'2, -ZnX'1, -C?=CH, -C?=C- SiR'2R'3R'4 or P'-Sp'-;    R'2, R'3 and R'4=R';or    two of R'2, R'3 and R'4 together with the hetero atom=ring;    X'1 and X'2=halo.    Provided that: one or both of Ar1 and Ar2 is a single bond.