Coating composition comprising a binder polymer obtainable by copolymerizing a monomer mixture comprising a vinyl monomer and a butenolide monomer

A coating composition comprising a binder polymer, which binder polymer is obtainable by copolymerizing a monomer mixture comprising a vinyl monomer M1 and a butenolide monomer M2,

• wherein the vinyl monomer M1 has a difference in 13C chemical shift between the α-C and β-C of the vinyl group of at least 25 ppm,
• and wherein the butenolide monomer M2 is a substituted-5-hydroxy-2(5H)-furanone of general formula (I):
• wherein R1 is any one of:
• —C(O)R2, —C(O)OR2, —C(O)NR2R3, —S(O)R2, —S(O2)R2, —C(O)SR2, —C(S)SR2 and —C(S)NR2R3,
• wherein R2 is alkyl or aryl, and wherein R3 is hydrogen, alkyl or aryl, or wherein R2 and R3 together with the nitrogen atom through which they are linked form a nitrogen-containing cyclic heteroalkyl group or nitrogen-containing heteroaryl group;
• and
• wherein the difference in 13C chemical shift between the α-C and β-C of the vinyl group is determined from the chemical shift reported in the Spectral Database for Organic Compounds (https://sdbs.db.aist.go.jp/sdbs/cgi-bin/direct_frame_top.cgi), managed by the National Institute of Advanced Industrial Science and Technology.