Biobased hydroxyl or carboxyl polyester resins

A polyester resin having a linear or branched structure and free of unsaturated fatty acids, which is hydroxylated or carboxylated, optionally hydroxylated and carboxylated, which is derived from:

• a) an acid component a) comprising:
• a1) at least one C4 to C6 polycarboxylic acid or anhydride,
• a2) at least one C8 to C54 polycarboxylic acid or anhydride,
• a3) optionally, at least one C2 to C22 saturated monoacid, which can optionally bear a hydroxyl group,
• b) an alcohol component b) comprising:
• b1) at least one biobased polyol having a functionality fb1 of at least 2, bearing a 1,4:3,6-dianhydrohexitol unit,
• and at least one of the following two polyols b2) and b3):
• b2) at least one polyol different than b1) and having a functionality fb2 of at least 2,
• b3) at least one polyol different than b1) and than b2) having a functionality fb3 of at least 3.