Patent ID: 7018684

Claim:
A block copolymer comprising at least one block (A) having at least 3 repeat units with the general formula (CI) where R 100 represents hydrogen or methyl and R 701 represents hydrogen or C 1 –C 8 alkyl, and at least one block (B) having repeat units with the general formula (CII) where R 702 represents hydrogen or methyl and R 703 [STPQ], wherein [SPTQ] is represents either S 1 -T 1 -Q 1 -A or S 2 -T 2 -Q 2 -M where S 1 , S 2 signify independently of one another the atoms O, S or the group NR 1 , R 1 signifies hydrogen or C 1 –C 4 alkyl, T 1 , T 2 signify independently of one another the group (CH 2 ) n , n signifies the numbers 2, 3 or 4, and each of Q 1 and Q 2 denotes a divalent group, A is a unit which absorbs electromagnetic radiation and is represented by the formula where R 2 to R 7 signify independently of one another hydrogen, hydroxyl, halogen, nitro, cyano, C 1 –C 4 -alkyl, C 1 –C 4 alkoxy, CF 3 , CCl 3 , CBr 3 , SO 2 CF 3 , C 1 –C 6 -alkyl-sulfonyl, phenylsulfonyl, C 1 –C 6 -alkylaminosulfonyl, phenylaminosulfonyl, aminocarbonyl, C 1 –C 6 -alkylaminocarbonyl, phenylaminocarbonyl or COOR 1 , M is a polarizable aromatic group having at least 12 π-electrons and is represented by the formula where R 8 to R 13 signify independently of one another hydrogen, hydroxyl, halogen, nitro, cyano, C 1 –C 4 alkyl, C 1 –C 4 alkoxy, CF 3 , CCl 3 , CB 3 , SO 2 CF 3 , C 1 –C 6 alkyl-sulfonyl, phenylsulfonyl, C 1 –C 6 -alkylaminosulfonyl, phenylaminosulfonyl, aminocarbonyl, C 1 –C 6 -alkylaminocarbonyl, phenylaminocarbonyl or COOR 1 and Y signifies —COO—, —OCO—, —CONH—, —NHCO—, —O—, —NH—, —N(CH 3 )— or a single bond with the proviso that at least one unit of polymer (B) contains S 1 -T 1 -Q 1 -A.