Method of producing polyarylene sulfide
US10196487B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 2016 |
| Grant date | Feb 5, 2019 |
| Priority date | — |
| Expiry date | Sep 30, 2036 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G75/025
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention is to provide a method of producing highly pure polyarylene sulfide (PAS) while the produced amount per unit volume is enhanced and side reactions are suppressed. The method of producing PAS according to an embodiment of the present invention, the method including: a preparation step of preparing a mixture containing an organic amide solvent, a sulfur source, water, a dihalo aromatic compound, and an alkali metal hydroxide in an amount that is less than an equimolar amount per 1 mol of the sulfur source; a first-stage polymerization of heating the mixture; an alkali addition step of adding the alkali metal hydroxide, in an amount that is not less than an equimolar amount per 1 mol of the sulfur source, into the mixture that has undergone the first-stage polymerization step; a concentration step of removing at least a part of the organic amide solvent and/or at least a part of the water in the mixture that has undergone the first-stage polymerization step; and a second-stage polymerization step of heating the mixture that has undergone the alkali addition step and the concentration step and continuing the polymerization reaction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.