Method of producing polyarylene sulfide
US10533072B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 5, 2018 |
| Grant date | Jan 14, 2020 |
| Priority date | — |
| Expiry date | Feb 5, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G75/0259
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The production method of the present invention includes: a supplying step of supplying reaction raw materials to at least one of a plurality of reaction vessels that mutually communicate through a gas phase; a polymerizing step of carrying out a polymerization reaction; and a step of removing at least some of the water present in the reaction vessels. Each of the steps is carried out in parallel, and a reaction mixture is transferred sequentially between the reaction vessels. The amount of water contained in the reaction mixture in at least one of the reaction vessels is from 0.1 moles to less than 3 moles per mole of a sulfur source, and the total amount of water contained in the reaction raw materials that are supplied is 3 moles or more per mole of the sulfur source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.