Patent ID: 9587074
Date: 2017-03-07
CPC Classifications: B01J,C08G

Claim:
1. A multi-stage method for forming a polyarylene sulfide comprising: providing a complex that includes an alkali metal organic amine carboxylic acid salt and an alkali metal hydrogen sulfide; carrying out a first polymerization reaction in a first reactor during which the complex is reacted with a dihaloaromatic monomer in the presence of an organic amide solvent to form a polyarylene sulfide prepolymer, wherein the first reactor is maintained at a pressure of from about 500 to about 1,600 kilopascals for at least a portion of the first polymerization reaction; thereafter, carrying out a second polymerization reaction in a second reactor during which the polyarylene sulfide prepolymer is reacted with a dihaloaromatic monomer and a sulfur-containing monomer to form the polyarylene sulfide; and removing vapor from the second reactor to maintain a pressure of less than about 1,500 kilopascals for at least a portion of the second polymerization reaction.