1,3-dibromo-5,5-dimethylhydantoin of enhanced properties
US6508954B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 18, 2000 |
| Grant date | Jan 21, 2003 |
| Priority date | — |
| Expiry date | Jan 18, 2020 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01N59/00
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Among the enhanced properties of the 1,3-dibromo-5,5-dimethylhydantoins described are their larger average particle sizes, their compactibility even though devoid of a binder, their excellent free-flowing and low-dust properties, and their more appealing aesthetic qualities, as compared to previously known 1,3-dibromo-5,5-dimethylhydantoins. These novel 1,3-dibromo-5,5-dimethylhydantoins can be produced, for example, by concurrently feeding (i) an aqueous solution or slurry formed from an inorganic base and 5,5-dimethylhydantoin, and (ii) a brominating agent, in proportions such that each nitrogen atom is substituted by a bromine atom, thereby forming product which precipitates in an aqueous reaction mixture. The pH of the reaction mixture is maintained in the range of about 5.5 to about 8.5.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.