Process for making alkali resistant hyperfiltration membrane and resulting product
US4834886A · kind A · utility
7Cited by
8References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 8, 1987 |
| Grant date | May 30, 1989 |
| Priority date | — |
| Expiry date | Jan 8, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/42
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A novel hyperfiltration membrane and process for making the same is described. The membrane is useful for processing copper electroless solutions to concentrate for re-use salts of chelating agents. The membrane can be prepared by crosslinking a water-compatible polymer in the presence of a phosphorus-containing acid, such as phosphoric acid, wherein the acid is present in a sufficient amount to catalyze crosslinking and to form a plurality of pores in the coating when dried.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.