Stable emulsions of p-hydroxybenzoic acid esters and method of preparation
US4357258A · kind A · utility
3Cited by
2References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 23, 1980 |
| Grant date | Nov 2, 1982 |
| Priority date | — |
| Expiry date | Oct 23, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K23/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A heat and freeze-thaw stable, oil-in-water emulsion is comprised of from approximately 10% to 60% by weight of a eutectic oil containing a mixture of three or more lower alkyl esters of p-hydroxybenzoic acid, from approximately 1.5% to 5.0% by weight of an emulsifying agent which may be gelatin, casein, collagen, glyceryl oleate, the ammonium or sodium salt of sulfated nonylphenoxypoly(ethyleneoxy) ethanol or mixtures thereof, from approximately 3% to 10% by weight of sorbitol and the balance water. The method of preparing such emulsions is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.