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Stoichrometric amounts of diethylester, of BTDA (BTDE) 0.67 mole, and the monoethylester of Nadic Anhydride, (NE), 1.10 mole and the monoethylester of Phthalic Anhydride (PE), 0.12 mole were prepared by refluxing the corresponding anhydrides with an excess of ethanol (2.69 mole). The stoichrometric amount of ethanol needed for the NE+BTDA used is 2.57 moles. Thus, an excess of 0.12 moles is employed to ensure complete or near complete conversion. Since this type of reaction is an esterification, which always requires an excess of alcohol, the alcohol is not there as a solvent. The esterification reaction was for one hour at reflux (approximately 351.4K.) and was carried out in a three neck round bottom flask equipped with a mechanical stirring device. When all of the monomers had gone into solution, the refluxing was continued for one-half hour longer. The solution was allowed to cool to 310K.-320K. and then mixed with Jeffamine AP-22, 2.56 molar equivalents of amine, which had previously been warmed to 310K.-320K.

1. customSince this type of reaction
2. customThe esterification reaction
3. customequipped with a mechanical stirring device
4. waitthe refluxing was continued for one-half hour
5. temperatureto cool to 310K.-320K
6. temperaturehad previously been warmed to 310K.-320K