Process for the preparation of complex oligomeric structures

摘要

The invention relates to a process for the preparation of complex oligomeric structures obtained from vegetable oils. These structures comprise esters containing acid groups which are in turn esterified.

主权项

1. Process for the preparation of mixtures of triglyceride comprising one or more of the following oligomeric structures:
R4—[O—C(O)—R1—C(O)—O—CH2—CH(OR2)—CH2]n—O—R3 wherein
R1 is selected from C2-C22 alkylenes, R2 is selected from one or more of the following groups consisting of C6-C24 dicarboxylic acid residues and C6-C24 monocarboxylic acid residues, R3 is selected from one or more of the following groups consisting of H, C6-C24 dicarboxylic acid residues and C6-C24 monocarboxylic acid residues, R4 is an alkyl group, n is an integer equal to or greater than 2, said C6-C24 dicarboxylic acids of R2 and R3 being esterified with monoalcohols and said mixture of triglycerides having a Number Average Molecular Weight (Mn) of between 800 and 10,000 Da, which comprises the step of esterification of a mixture of one or more triglycerides containing saturated dicarboxylic acids with alcohols at temperatures between 50 and 250° C. and which occurs in the absence of catalyst or in the presence of an acid catalyst consisting of one or more phosphorus compounds.