Compositions of p-hydroxybenzoic acid esters and methods of preparation and use
US4496576A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 12, 1983 |
| Grant date | Jan 29, 1985 |
| Priority date | — |
| Expiry date | Sep 12, 2003 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01N43/50
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A composition having broad spectrum antimicrobial activity and being freeze and heat stable is comprised of a clear solution containing up to approximately 90% by weight of a eutectic mixture of three or more lower alkyl esters of p-hydroxybenzoic acid such as isopropyl p-hydroxybenzoate, isobutyl p-hydroxybenzoate and n-butyl p-hydroxybenzoate in a ratio between approximately 1:1:1 to 4:2:2, respectively, approximately 10% to 90% by weight of a "Glydant" solution (composed of 55% 1,3-bis(hydroxymethyl)-5,5-dimethylhydantoin and 45% water) and at least approximately 0.5% by weight based on the weight of the eutectic mixture and the "Glydant" solution of an anionic surfactant. The latter, for example, may be dioctyl sodium sulfosuccinate, sodium lauryl sulfate or the ammonium or sodium salt of sulfated nonylphenoxypoly(ethyleneoxy) ethanol.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.