Preparation of polyether polymers using bisphenol hydrate as intermediate
US5663275A · kind A · utility
19Cited by
8References
16Claims
0Family size
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Key dates
| Filing date | Jul 5, 1996 |
| Grant date | Sep 2, 1997 |
| Priority date | — |
| Expiry date | Jul 5, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G73/125
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Aromatic polyether polymers, illustrated by polyethersulfones, polyetherketones and polyetherimides, are prepared by a phase transfer catalyzed reaction between a hydrate of a salt of a dihydroxyaromatic compound and a substituted aromatic compound such as bis(4-hydroxyphenyl) sulfone, bis(4-hydroxyphenyl) ketone or 1,3-bis[N-(4-chlorophthalimido)]benzene. Isolation of the hydrate and its conversion to the anhydrous salt prior to the polymerization reaction affords a polymer of higher molecular weight than other methods of preparing the anhydrous salt.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.