Process for preparing methylolhydantoins
US5252744A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 21, 1992 |
| Grant date | Oct 12, 1993 |
| Priority date | — |
| Expiry date | May 21, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D233/78
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
There are provided methods for producing solid anhydrous methylolhydantoins. Initially, an aqueous stirrable medium is dehydrated and heated to yield a substantially anhydrous stirrable melt. The aqueous stirrable medium includes (A) a solute selected from the group consisting of (i) a dimethyloldimethylhydantoin, (ii) a hydantoin reactant, (iii) a formaldehyde source reactant, or (iv) a combination of any of the foregoing; and (B) optionally a catalyst. A molten system is then provided by adding, to the stirrable melt, a reactant mixture which includes (A)(i) the same or a different hydantoin reactant, (ii) a substantially anhydrous formaldehyde source reactant which may be the same as or different than the formaldehyde source reactant, or (iii) a combination thereof; and (B) optionally, the same or a different catalyst; wherein the molten system includes (i) at least one hydantoin reactant and (ii) at least one dehydrated formaldehyde source reactant or substantially anhydrous formaldehyde source reactant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.