Process for preparing methylolhydantoins

Details Process for preparing methylolhydantoins Process for preparing methylolhydantoins

1992-05-21

1993-10-12

Brust, Joseph Paul

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

5483191, C07D23374, C07D23378

Patent

active

052527441

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.

REFERENCES:
patent: 3987184 (1976-10-01), Foelsch et al.
patent: 4908456 (1990-03-01), Farina et al.
patent: 5036095 (1991-07-01), Andermann

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