System for sustained release of phenolic material from porous granules of insoluble polymeric phenolic complexes
US4058462A · kind A · utility
3Cited by
3References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 17, 1975 |
| Grant date | Nov 15, 1977 |
| Priority date | — |
| Expiry date | Oct 17, 1995 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01N25/10
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A system for sustained release of phenolic material into a fluid from phenolic complexes of water-insoluble, but water-swellable crosslinked N-vinyllactam or N-alkyl-N-vinylamide polymers in the form of porous beads or granules. The complexes, which are particularly suited for use in situations wherein fluids containing phenolic materials in limited quantities are desired, and are provided by leaching a limited amount of phenolic material from the complex by contacting the porous granules in a container, such as in a canister or column which is used to treat liquids or water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.