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US 8,263,734 B2Granted
System and method for reducing off-gassing of polyphenylene sulfide
AssigneeChevron Phillips Chemical Company LP
InventorsJeffrey S. Fodor, Aubrey South, Jr.
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Abstract
The techniques provide a system and a method of producing polyphenylene sulfide (PPS) polymer. The PPS polymer is produced by reacting a sulfur source and a dihaloaromatic compound in the presence of a polar organic compound in a polymerization mixture in a polymerization vessel. The PPS polymer is washed with a base to lower the oligomer content of the PPS polymer and thus the off-gassing during processing.
Claims17
A method of producing polyphenylene sulfide (PPS) polymer, comprising:
- reacting a sulfur source and a dihaloaromatic compound in the presence of a polar organic compound in a polymerization mixture in a polymerization vessel to form a PPS polymer;
- flash evaporating at least a portion of the polar organic compound from the polymerization mixture to terminate the reaction of the sulfur source and the dihaloaromatic compound;
- and
- washing the PPS polymer with a base or a solvent comprising n-methyl pyrrolidone (NMP), wherein washing lowers off-gassing of the PPS polymer.
1 more element
A process for manufacturing a product comprising PPS polymer, the process comprising:
- forming a PPS polymer into a product, the PPS polymer being produced by a method comprising:
- reacting a sulfur source and a dihaloaromatic compound in a presence of a polar organic compound in a polymerization mixture in a polymerization vessel to form the PPS polymer;
- flash evaporating at least a portion of the polar organic compound from the polymerization mixture to terminate the reaction of the sulfur source and the dihaloaromatic compound;
- and
- washing the PPS polymer with a base or a solvent comprising n-methyl pyrrolidone (NMP) to lower an oligomer content of the PPS polymer.
2 more elements
Dependencies are inferred from the claim text.