Colloidal alcohol-dispersible association complexes of ceric dioxide and a hydroxyphenyl carboxylic acid
US4886624A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 18, 1987 |
| Grant date | Dec 12, 1989 |
| Priority date | — |
| Expiry date | Aug 18, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C65/03
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process is provided for preparing colloidal dispersions of alcohol-dispersible association complexes of ceric dioxide and a hydroxyphenyl carboxylic acid having from about seven to about twenty carbon atoms in a molar ratio CeO.sub.2 /acid of at least about 6:1 which comprises: PA1 (1) mixing PA2 (a) ceric dioxide comprising ammonium nitrate or ammonium and nitrate ions in an amount within the range from about 3 to about 14% by weight of the ceric dioxide and a member selected from the group consisting of water, methanol, acetic acid and mixtures thereof in an amount usually from about 10 to about 60 g per mole of CeO.sub.2, sufficient to effect reaction with PA2 (b) a hydroxyphenyl carboxylic acid having from about seven to about twenty carbon atoms PA2 (c) an aliphatic alcohol, such as methanol, isopropanol, 2-ethoxy ethanol, etc. at a temperature within the range from room temperature to about 100.degree. C., thereby effecting dispersion of the ceric dioxide in the aliphatic alcohol.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.