Acid functional and epoxy functional polyester resins

Adducts of any of the formulae:

• wherein E is a branched alkyl residue having from 5 to 19 carbon atoms, and/or a compound of the formula
• and/or a compound of the formula
• and/or a compound of the formula
• and/or compound of the formula
• and/or a compound of the formula
• or mixtures thereof, said adduct(s) being mixed with a starting dicarboxylic acid comprising an A1 compound represented by the formula:
• wherein a≧1, R1 and R2 each may represent an alkyl group having from 1 to 4 carbon atoms or wherein R1 and R2 may form, together with the group —CH—(CH2)a—CH—, a cycloalkyl group.

A process for the preparation of carboxyl functional polyesters, comprising mixing and reacting

• a) at least a compound of the formula
• wherein a≧1 wherein in R1 and R2 each may represent an alkyl group having from 1 to 4 carbon atoms or wherein R1 and R2 may form together, with the group —CH—(CH2)a—CH—, a cycloalkyl group, mixed with smaller molar amounts of monoglycidyl esters of α,α-branched carboxyl acids containing from 5 to 19 carbon atoms in the acid moiety (A2), followed by simultaneous or stepwise addition of
• b) at least one compound B comprising one primary- or secondary hydroxyl group and one tertiary aliphatic carboxyl group,
• c) optionally one diol compound C comprising two hydroxyl groups which may each independently by a primary or a secondary hydroxyl group and which compounds do not contain aromatic unsaturation;
• d) optionally a dihydroxymonocarboxylic acid compound D, comprising a tertiary aliphatic carboxyl group and two aliphatic hydroxyl groups, which may each independently be primary or secondary hydroxyl;
• and
• e) optionally a trihydroxyalkane (E1) or tetrahydroxyalkane (E2), the molar ratio of compounds A1(C+A2):B:D:E1:E2, being (x+y+1):y:2:x:Q:P, wherein X ranges from 0 to 8, Y ranges from 1 to 8, Q ranges from 0 to 3 and wherein P ranges from 0 to 3, at a temperature of from 100 to 240° C., until essentially all the hydroxyl groups as initially present in the reaction mixture have been reacted.