Process for forming low halogen content polyarylene sulfides
AssigneeTicona LLC
InventorHendrich Alvarez Chiong
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Abstract
A multi-stage process and system for formation of a polyarylene sulfide is described. A first polymerization stage of the formation process can include reaction of a sulfide monomer with a dihaloaromatic monomer to form a prepolymer. A second polymerization stage can include further polymerization of the prepolymer with a sulfur-containing monomer and a dihaloaromatic monomer to form a low halogen content polyarylene sulfide. The amount of sulfur utilized in the second polymerization stage is a low fraction of the total amount of sulfur utilized in the multi-stage process.
Claims26
A multi-stage method for forming a polyarylene sulfide comprising:
- reacting a complex with a first dihaloaromatic monomer to form a polyarylene sulfide prepolymer, the complex including an alkali metal organic amine carboxylic acid salt and an alkali metal hydrogen sulfide;
- thereafter, carrying out a second polymerization reaction during which the polyarylene sulfide prepolymer is reacted with a second dihaloaromatic monomer and a sulfur-containing monomer in an organic amide solvent to form the polyarylene sulfide, wherein from about 0.1% to about 10% by weight of the total amount of sulfur charged to the multi-stage method is charged to the second polymerization reaction.
A polyarylene sulfide having a halogen content of about 1000 ppm or less and a melt viscosity of about 500 Poise or less.
Dependencies are inferred from the claim text.