Resins and coating compositions

A polyesteramide resin containing ester groups and at least one amide group in the backbone characterized in that the resin has a Tg <0 ° C. and at least one hydroxyalkylamide endgroup having the structure I

• wherein the free bond extends to the polymer backbone;
• A is an, optionally substituted, (C6-C24) aryldiradical or an, optionally substituted (C2-C24) (cyclo)alkyl aliphatic diradical;
• H or (C1-C20) (cyclo) alkyl,
• or (C6-C10) aryl;
• X1 is H or a group —CO—R7, —CO-A-CO—N(R8,R9), —CO-A-CO—OR10, or —NHet;
• R1 to R6 are, independently of each other, H, (C1-C20) alkyl, (C3-C7) cycloalkyl or (C6-C10) aryl;
• R7 is (C1-C20) alkyl, (C3-C7) cycloalkyl, (C6-C10) aryl, or a radical of a polymer or an oligomer;
• R8 and R9 are, independently of each other, (C1-C20) alkyl or (C6-C10) aryl groups;
• or (C1-C20) alkyl or (C6-C10) aryl groups substituted by a group containing at least one hetero atom or R8 and R9 together with the nitrogen atom to which they are attached form a 5 or 6 membered ring wherein optionally one or several C-atoms are replaced by —NH, —N—(C1-C20) alkyl, —N-aryl, —O— or —S—;
• R10 is (C1-C20) alkyl, (C3-C7) cycloalkyl or (C6-C10) aryl, or a radical of a polymer or an oligomer;
• —NHet is a mono-, bi- or multicyclic nitrogen containing heterocyclyl group attached via a nitrogen atom to the polymer which may be aromatic or partly or completely hydrogenated and may contain additional heteroatoms such as nitrogen, oxygen or sulfur and which may optionally be substituted;
• n is an integer of 1 to 4, preferably n =1;
• wherein that no more than one of X1 and X2 is H, (C1-C20) alkyl, (C3-C7) cycloalkyl or (C6-C10) aryl;
• and
• wherein nitrogen containing groups may be quaternized or protonated;
• and wherein
• the polyesteramide resin comprises:
• a) at least a diacid and/or anhydride;
• b) at least an alkanolamine, and
• c) functional end groups different than OH groups, provided by at least one component being a fatty acid selected from the list consisting of octanoic, isononanoic, decanoic, lauric, versatic -5 acid, versatic -10 acid and mixtures thereof,
• wherein the a):b) equivalent ratio is from 1.0:1.0 and 1.0:3;
• and wherein
• the polyesteramide resin also comprises at least a functionality selected from the group consisting of carboxylic acid groups, ester groups, polyethylene oxide groups, polypropylene oxide groups, amine groups, tertiary amine groups, quaternary amine groups, cyclic groups, heterocyclic groups, phenolic groups and mixtures thereof.