Polymers of oxetane-spiro-cyclic polyethers
US4140847A · kind A · utility
5Cited by
1References
22Claims
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Key dates
| Filing date | Oct 1, 1974 |
| Grant date | Feb 20, 1979 |
| Priority date | — |
| Expiry date | Oct 1, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/18
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Novel linear, branched and cyclic polymers of the repeating unit ##STR1## wherein R is ethylene or propylene bearing from zero to six methyl groups and m and n are lower integers and a process for utilizing said polymers to extract salts from solution are disclosed. For example, a monomer of the formula ##STR2## is contacted with traces of water in the presence of BF.sub.3.etherate to give a homopolymer consisting essentially of repeating units of the formula ##STR3## which extracts sodium salts from aqueous solution in a thermally reversible manner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.