Patent DE-3266701-D1 (DE)
Title: Ester compounds, process for their preparation and their use as hardeners
Inventor: JUST CHRISTOPH DR
IPC: C09D5/03
Filed: 1982-08-19
Granted: 1985-11-07
Abstract: 1. Claims for the Contracting States : CH, LI, DE, GB, NL An ester compound of the formula  see diagramm : EP0073022,P12,F1  in which R denotes the radical of an oligomer and/or polymer having at least 3 free lateral OH groups, R**1 denotes the radical of an at least tribasic carboxylic acid capable of internal anhydride formation, R**2 denotes the group >O and/or two free OH radicals or a combination of a C1-18 -alkoxy radical and an OH radical, where the CO groups bonded to the radical R**2 are in ortho- or peri-position relative to each other so that they are capable of anhydride formation, and in which R**1 , R**2 and R**3 within a molecule can also have various of these meanings, R**3 denotes the radical of an at least dibasic carboxylic acid and can also have the same meaning as R**1 , and in which in the above formula in at least one of the two side chains containing R**1 and if R**3 denotes the radical of an at least tribasic carboxylic acid, also at least one of side chains containing R**3 can contain a -COOH group at the carbon atom adjacent to or in periposition relative to the ester bond with R, which is capable of formation a further intramolecular anhydride group and whereby in the above formula the radical R**3 is demonstrated as a tribasic carboxylic acid which can also be dibasic or have a higher basicity. 1. Claims for the contracting state : AT A process for the preparation of compounds of the formule  see diagramm : EP0073022,P13,F1  by reacting oligomers and/or polymers having at least three free lateral alcoholic OH-groups with at least tribasic carboxylic acid components characterized in that at least one tribasic carboxylic acid component, capable of internal anhydride formation, alone or together with an at least dibasic carboxylic acid component is reacted with an oligomer or polymer R, having free OH-groups under formation of an oligomeric or polymeric compound of the formula I, in which R denotes the radical of an oligomer and/or polymer having at least 3 free lateral OH groups, R**1 denotes the radical of an at least tribasic carboxylic acid capable of internal anhydride formation, R**2 denotes the group >O and/or two free OH radicales or a combination of a C1-18 -alkoxy radical and an OH radical, where the CO groups bonded to the radical R**2 are in ortho- or peri-position relative to each other so that they are capable of anhydride formation, and in which R**1 , R**2 and R**3 within a molecule can also have various of these meanings, R**3 denotes the radical of an at least dibasic carboxylic acid and can also have the same meaning as R**1 , and in which in the above formula in at least one of the two side chains containing R**1 and if R**3 denotes the radical of an at least tribasic carboxylic acid, also at least one of side chains containing R**3 can contain a -COOH group at the carbon atom adjacent to or in peri-position relative to the ester bond with R, which is capable of formation a further intramolecular anhydride group and whereby in the above formula the radical R**3 is demonstrated as a tribasic carboxylic acid which can also be dibasic or have a higher basicity, while removing reaction water formed, isolating the formed product as such or subjecting this product at least partially to hydrolysis and/or esterification of the present anhydride groups.