Aromatic polymer
US4970271A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 18, 1989 |
| Grant date | Nov 13, 1990 |
| Priority date | — |
| Expiry date | Jan 18, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L71/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An aromatic polymer comprises divalent aromatic units linked through oxygen, characterized in that some at least of those units are or contain aromatic rings free of electron-withdrawing groups and in that at least one of such rings carries at least one nitrogen radical linked to a nuclear carbon atom by a nitrogen-carbon bond. Preferably it consists to the extent of at least 75 mol percent by the repeating units: EQU O--Ph'--O--Ph--A--Ph I alone or in combination with EQU O--Ph--A--Ph--O--Ph--A--Ph II where PA0 Ph is paraphenylene; PA0 Ph' is phenylene, at least some of groups Ph' carrying a nitrogen radical; PA0 A is SO.sub.2 or CO; and PA0 the As can be the same or different in the polymer chain. PA0 A process is provided which comprises nitrating a parent polymer and optionally reducing nitro groups to amino followed optionally by substitution of amino.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.