Methods for recycling byproduct of polyester resin production

摘要

Processes for preparing polyester resins as toner production components. The processes include reacting an organic diol and a cyclic alkylene carbonate to produce carbon dioxide (CO2) and a polyalkoxy diol. The carbon dioxide is reacted with an alkylene glycol or alkylene oxide to produce additional cyclic alkylene carbonate having the same chemical structure as the cyclic alkylene carbonate used to produce the polyalkoxy diol. The additional cyclic alkylene carbonate is added with the cyclic alkylene carbonate used to produce the polyalkoxy diol. The polyalkoxy diol can be reacted with an organic diacid or diester in preparing a polyester resin. To prepare a toner, the polyester resin can be contacted with at least one toner production component.

主权项

1. A process for preparing a polyester resin as a toner production component comprising:
reacting an organic diol and a first cyclic alkylene carbonate in a first reaction mixture, thereby producing carbon dioxide (CO2) and a polyalkoxy diol, reacting the CO2 with an alkylene glycol or alkylene oxide in a second reaction mixture, thereby producing a second cyclic alkylene carbonate, and adding the second cyclic alkylene carbonate to the first cyclic alkylene carbonate and/or the first reaction mixture, wherein the first cyclic alkylene carbonate and the second alkylene carbonate have the same chemical structure.