Granular polyarylene sulfide and process for manufacturing the same
US9422400B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 29, 2013 |
| Grant date | Aug 23, 2016 |
| Priority date | — |
| Expiry date | Mar 29, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G75/0268
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A granular polyarylene sulfide; (i) the granular polyarylene sulfide containing an —S— substituent at the terminal, the substituent being formed by cleavage of a disulfide compound; (ii) the granular polyarylene sulfide being an oversize fraction after sifting with a sieve having a mesh size of at least 38 μm; (iii) the granular polyarylene sulfide having a halogen content of at most 1,500 ppm; and (iv) the granular polyarylene sulfide being a granular polyarylene sulfide having a melt viscosity of 3 to 100 Pa·s when measured under conditions at a temperature of 310° C. and a shear rate of 1,200 sec−1. The granular polyarylene sulfide is well balanced in melt viscosity, halogen content, nitrogen content, thermal stability, and yield.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.