Back to results
US 5,352,693 AGranted
Preservative mixtures
AssigneeLonza Ltd.
InventorThomas E. Farina
Life of this patent
Estimating the term…
Abstract
A solid composition comprising a dispersion of at least one alkyl ester of p-hydroxybenzoic acid in a hydroxymethyl-substituted dimethylhydantoin, its method of preparation, and its use as a preservative in shampoos, lotions, and cosmetics.
Claims9
A solid preservative composition comprising a dispersion of an alkyl ester of p-hydroxybenzoic acid or mixtures of such esters in a hydroxymethyl-substituted dimethylhydantoin, wherein the aforesaid alkyl group has from 1 to 6 carbon atoms and the weight ratio of the hydantoin to the ester component is from 1:3 to 9:1.
A method of preparing a solid preservative composition which comprises:
- melting a hydroxymethyl-substituted dimethylhydantoin and adding thereto an alkyl ester of p-hydroxybenzoic acid or a mixture of such esters, dispersing said ester in said hydantoin component, and thereafter cooling said dispersion to form a solid homogeneous compound, wherein the aforesaid alkyl group has from 1 to 6 carbon atoms and the weight ratio of the hydantoin to the ester component is from 1:3 to 9:1.
Dependencies are inferred from the claim text.