Sulphonated polyarylethersulphone copolymers
US4273903A · kind A · utility
42Cited by
6References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 21, 1979 |
| Grant date | Jun 16, 1981 |
| Priority date | — |
| Expiry date | Aug 21, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/48
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A polyarylethersulphone copolymer which is a hydrophilic sulphonated copolymer derived by controllably sulphonating a copolymer having the repeat unit of formula ##STR1## together with the repeat unit B of formula ##STR2## substantially all the units A being sulphonated after sulphonation and substantially all the units B remaining non-sulphonated after sulphonation. The sulphonation is effected using 98% w/w sulphuric acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.