Surface treated porous ceramic membranes and method of making same
US4962073A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 31, 1988 |
| Grant date | Oct 9, 1990 |
| Priority date | — |
| Expiry date | Oct 31, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB82Y40/00
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A treated permeable inorganic membrane is disclosed comprising a metal oxide/hydroxide capable of reacting with a phosphoric acid ester. The treated membrane has good chemical stability over a pH range of from 2 to 12. Chemically bonded to the metal oxide/hydroxide surface of the membrane is a monomolecular layer of one or more phosphoric acid esters selected from the class consisting of one or more phosphoric acid monoesters having the formula (RO)PO(OH).sub.2, one or more phosphoric acid diesters having the formula (RO)(R'O)PO(OH), and mixtures of same where R comprises a 1-30 carbon-containing group and R'comprises hydrogen or a 1-30 carbon-containing group. Excess phosphoric acid esters not bonded to the underlying membrane surface is removed to ensure formation of the monomolecular layer of the phosphoric acid esters on the surfaces of the membrane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.