Process for the production of polyarylene sulfides with lithium halide and alkali metal hydrosulfide
US5109110A · kind A · utility
7Cited by
12References
6Claims
0Family size
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Key dates
| Filing date | Jun 12, 1989 |
| Grant date | Apr 28, 1992 |
| Priority date | — |
| Expiry date | Jun 12, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G75/0259
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polyarylene sulfides are produced by polymerizing a dihalogen aromatic compound with an alkali metal hydrosulfide in the presence of a lithium halide in an organic polar solvent. In this polymerization, an alkali metal hydroxide and/or carbonate is added and a branching agent such as a trihalogen aromatic compound or a halogen aromatic nitro compound is used, if desired. The polyarylene sulfides have a high molecular weight and a less salt contents and a high degree of whiteness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.