Adipic Acid → Adipic Acid

Participants

Reaction Steps

1,2-propylene glycol, terephthalic acd, adipic acid, and trilmellitic anhydride were placed in a reaction container equipped with a condenser, a stirrer, and a nitrogen-introducing tube in such a manner that the molar ratio ([OH]/[COOH]) of a hydroxy group to a carboxylic group was 1.3. Dicarboxylic acid was formed of 80% by mol of terephthalic acid and 20% by mol of adipic acid. Trilmellitic anhydride was set to be 2.5% by mol to the total of monomers. 1,000 ppm of titanium tetraisopropoxide was added to all of the monomers. Next, the system was heated to 200° C. in about four hours and to 230° C. in two hours and reacted until effluent water became nil. Furthermore, the reaction was continued with a reduced pressure of from 10 mmHg to 15 mmHG for five hours to obtain a polyester having a hydroxy group.

Provenance & Evidence