Process for preparing polyarylene sulfides with sodium hydrosulfide
US5093469A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 30, 1989 |
| Grant date | Mar 3, 1992 |
| Priority date | — |
| Expiry date | Aug 30, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC11C3/12
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polyarylene sulfides are prepared by reacting a dihalogen aromatic compound with a sodium hydrosulfide in the presence of an alkali metal aminoalkanoate and a lithium halide in an organic polar solvent. This process can prevent a decomposition of the sodium hydrosulfide during dehydration and produce the polyarylene sulfides in a granular form in high yields and with high efficiency. The polyarylene sulfides obtainable by this process are high in molecular weight and degree of whiteness and low in a content of salts remaining therein. Furthermore, the polyarylene sulfides are in the granular form so that they can be handled with ease because of their readily separability and washability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.