P-phenylene sulfide polymer preparation with dehydrated mixture of alkali metal hydroxide and excess alkali metal bisulfide
AssigneePhillips Petroleum Company
InventorsGuy Senatore, Afif M. Nesheiwat
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Abstract
Poly(p-phenylene sulfide) is prepared by the reaction of a p-dihalobenzene such as p-dichlorobenzene, with a dehydrated admixture of an alkali metal hydroxide such as sodium hydroxide, and an alkali metal bisulfide such as sodium bisulfide, in a polar organic solvent such as N-methyl-2-pyrollidone (NMP), employing a molar ratio of alkali metal hydroxide to alkali metal bisulfide of about 0.80:1 to 0.98:1. Poly(p-phenylene sulfide) having a high extrusion rate such as about 100 to about 1000 grams/10 minutes can be prepared in this manner.
Claims10
In a method for the preparation of poly(p-phenylene sulfide) wherein at least one p-dihalobenzene is brought together with a dehydrated admixture of at least one alkali metal hydroxide and at least one alkali metal bisulfide in the presence of at least one polar organic solvent under polymerization conditions for a time sufficient to form a reaction mixture comprising said poly(p-phenylene sulfide);
- the improvement comprises employing a molar ratio of alkali metal hydroxide to alkali metal bisulfide in said dehydrated admixture of about 0.80:1 to 0.98:1.
A method for the production of poly(p-phenylene sulfide) having an extrusion rate of about 100 g/10 min. to about 1000 g/10 min. comprising:
- admixing at least one p-dihalobenzene with a dehydrated admixture of alkali metal hydroxide and alkali metal bisulfide in the presence of an organic amide under polymerization conditions, wherein the molar ratio of said alkali metal hydroxide to said alkali metal bisulfide in said dehydrated admixture is in the range of about 0.80:1 to 0.98:1;
- wherein the molar ratio of p-dihalobenzene to alkali metal bisulfide is in the range of about 1:1 to about 1.1:1;
- thereby preparing said poly(p-phenylene sulfide), and
- recovering said poly(p-phenylene sulfide) from the polymerization reaction mixture.
Dependencies are inferred from the claim text.