TECHNOLOGY FOCUS - POLYMERS - Preparation: No preparation method given. Preferred Polymer: The polymer is selected form 6 polymers as given in specification e.g. compound of formula A1-Y'-A3-Y15-(A4-Y16)p-(A5-Y17)q-A2 (VII), and A1-A3-Y'-A4-(Y15-A5)p-(Y17-A'5)q-A2 (IX).Y', Y15, Y16 and Y17=(I);A1 and A2=-(Ar1)a-(Ar2)b-(Ar3)c-R10;a, b, and c=0, 1 , 2, or 3;A3, A4, A5 and A'5=-(Ar4)k'-(Ar5)i-(Ar6)r-(Ar7)z-;k', i, r, and z=0, 1, 2, or 3;R10=hydrogen, halogen, cyano, 1-25C alkyl (which is optionally substituted by E'' and/or interrupted by D''), -CH=C(R214)-R215, COO-1-18C alkyl, 4-18C cycloalkyl group (which is optionally substituted by G'', 2-18C alkenyl, 2-18C alkynyl, 1-18C thioalkoxy, 1-18C alkoxy (which is optionally substituted by E'' and/or interrupted by D''), 7-25C aralkyl (which is optionally substituted by G''); or group of formula (IVa), or (IVb);R22-R26 and R29-R33, and R58=H, halogen, cyano, 1-25C alkyl (which is optionally substituted by E'' and/or interrupted by D''), 6-24C aryl (which is optionally substituted by G''), 2-20C heteroaryl (which is optionally substituted by G''), 4-18C cycloalkyl group (which is optionally substituted by G''), 2-10C alkenyl, 2-25C alkynyl, 1-18C alkoxy (which is optionally substituted by E'' and/or interrupted by D''), or 7-25C aralkyl (which is substituted by G'');orR27 and R28=hydrogen, 1-25C alkyl, halogen, cyano or 7-25C aralkyl;orR27+R28=alkylene or alkenylene which is optionally bonded via oxygen and/or sulfur to the thienyl residue and which both have up to 25 carbon atoms;D''=-CO-, -COO-, -S-, -O-, or -NR''112-;E''=1-8C thioalkoxy, 1-8C alkoxy, CN, -NR''112R''113, -CONR''112R''113-, or halogen;orG''=E'', or 1-18C alkyl;R''112 and R''113=H; 6-18C aryl (which is substituted by 1-18C alkyl, or 1-18C alkoxy); or 1-18C alkyl (which is interrupted by -O-);R214 and R215=hydrogen, 1-18C alkyl, 6-24C aryl, 2-20C heteroaryl, -CN or COOR216;R216=1-25C alkyl, 1-25C haloalkyl, 7-25C arylalkyl, 6-24c aryl or 2-20C heteroaryl;R218=hydrogen, 6-18C aryl (which is substituted by 1-18C alkyl, or 1-18C alkoxy); or 1-25C alkyl (which is optionally be interrupted by oxygen or sulfur atoms); or 7-25C arylalkyl;Ar1-Ar7=group of formula (XIa) or (XIb);R3, R'3, R4 and R'4=hydrogen, or 1-25C alkyl. EXAMPLE - No suitable example given.