|Berneth, H; Bieringer, T; Hagen, R; Kostromine, S; Schmidt, H-W; Müller, A; Zilker, St; Frenz, C; Breiner, T: Block copolymers having groups that absorb electromagnetic radiation for optical data storage. , WO 2001092360, Bayer AG Germany|
Polymers with improved optical data storage efficiency have 1 CH2CRCO2R1 block (R = H or Me, R1 = H or C1-8 alkyl) with d.p. 3 and 1 CH2CRCOR1 block [R = H or Me, R1 = group contg. an electromagnetic radiation-absorbing group and(or) a polarizable arom. group with 12 electrons, 1 of the blocks contg. the electromagnetic radiation-absorbing group]. A typical block copolymer was manufd. by polymn. of Bu acrylate in the presence of CuBr and PMDETA in EtOAc, and polymn. of p-CH2:CMeCO2CH2CH2OC6H4N:NPh in the presence of the resulting macroinitiator and addnl. PMDETA and CuBr.