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US 2021/0238355 A1Published application
Preparation method of polyarylene sulfide
AssigneeLG Chem, Ltd.
InventorsJeongbin LEE, Joong Jin HAN, Eunju PARK, Sanghwan JO
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Abstract
The present disclosure relates to a preparation method of a polyarylene sulfide, and this method may produce a polyarylene sulfide having properties equal to or higher than those of the conventional method with a high molecular weight at a high yield by optimizing the content and molar ratio of an amide-based compound in a polymerization step.
Claims14
A process for preparing a polyarylene sulfide, comprising:
- a first step of preparing a sulfur source comprising dehydrating a hydrosulfide of an alkali metal and a hydroxide of an alkali metal in the presence of an organic acid salt of an alkali metal in a mixed solvent of water and an amide-based compound;
- and
- a second step of preparing a polyarylene sulfide by adding a dihalogenated aromatic compound and an amide-based compound to a reactor containing the sulfur source and performing a polymerization reaction;
- wherein the amide-based compound added in the second step is added in an amount of 1.0 to 2.0 equivalents based on 1 equivalent of the hydrosulfide of an alkali metal in the second step, and a molar ratio of water to the amide-based compound present in the polymerization reaction system of the second step is 0.5 to 0.85.
1 more element
Dependencies are inferred from the claim text.