| abstract |
The present invention relates to a copolymer comprising (i) a plurality of ethylene moieties A having a structure according to the following formula (A): wherein R2 and R3 independently represent hydrogen , halogen or optionally substituted linear, branched chain or cyclic alkyl (alkenyl), or optionally substituted aromatic or heteroaromatic, and (ii) a plurality of acetal moieties B having a structure according to the following formula (B): wherein L represents two A valent linking group; x=0 or 1 and R 1 represents an optionally substituted aromatic or heteroaromatic group comprising at least one hydroxyl group, and (iii) a plurality of groups comprising a group having its main absorption in the infrared region Acetal moiety C and/or moiety D of the structural moiety of the chromophore. |