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US 12,146,033 B2Granted
Preparation method of polyarylene sulfide
AssigneeLG Chem, Ltd.
InventorsMyeongjin Ha, Joong Jin Han, Eunju Park, Sung Ho Lee, Myong Jo Ham, Jeongbin Lee, Youngseok Kim
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Abstract
A method is provided for preparing a low temperature thermosetting polyarylene sulfide having significantly low crystallinity while maintaining a low melt flow rate at a high polymerization yield, so as to ensure excellent laser welding property and mechanical properties even when used in a molded product on the transmitting side of laser beam by a laser welding method.
Claims12
A preparation method of a polyarylene sulfide, comprising:
- preparing a sulfur source comprising a sulfide of an alkali metal and a mixed solvent by dehydrating a hydrosulfide of an alkali metal and a hydroxide of an alkali metal in the presence of a weak acid salt of an alkali metal in a mixed solvent of water and an amide-based compound, wherein the dehydrating is performed at a temperature of 185° C. to 205° C., wherein the weak acid salt of an alkali metal is used in an amount of 0.35 to 0.5 equivalents based on 1 equivalent of the hydrosulfide of an alkali metal;
- and
- 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 dihalogenated aromatic compound comprises a para-dihalo aromatic compound and an ortho-dihalo aromatic compound in a molar ratio of 95:5 to 90:10,
- wherein the polyarylene sulfide has a melt flow rate (MFR) measured at 315° C. under a load of 5 kg in accordance with ASTM D 1238 of 500 to 1200 g/10 min.
2 more elements
Dependencies are inferred from the claim text.