Method for quenching of catalyst in the production of low molecular weight polycarbonates
AssigneeGeneral Electric Company
InventorsTakayoshi Anamizu, Akio Kanezawa, Tomoaki Shimoda, Raphael Mestanza
Life of this patent
Estimating the term…
Abstract
Improved performance in high temperature, high vacuum reactors is obtained by quenching alkaline catalyst present in the product a melt polycondensation reaction using a sulfonic acid ester quencher in a carrier. The carrier if formed from a first carrier component effective to solubilize the quencher and having a lower boiling point than the quencher, and a second carrier component soluble in the first carrier component and having a higher boiling point than the quencher. An exemplary carrier composition contains equal parts of diphenylcarbonate and toluene.
Claims21
A method for quenching alkaline catalyst present in the product of a melt polycondensation reaction, comprising adding to the product a sulfonic acid ester quencher in a carrier comprising a first carrier component effective to solubilize the quencher and having a lower boiling point than the quencher, and a second carrier component soluble in the first carrier component and having a higher boiling point than the quencher.
Dependencies are inferred from the claim text.