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AssigneeLonza Ltd.
InventorsPatrick Jay Lutz, Susan Alcorn Ban, Thomas Edward Farina
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A highly stable liquid formulation having broad spectrum preservative properties which constitutes an admixture of an alkanol-substituted DMH, an iodopropynyl compound, a stabilizer of a hydantoin, urea or derivative thereof, and a hydroxyl solvent. Preferably the constituents are dimethyloldimethylhydantoin, 3-iodo-2-propynyl-butyl carbamate, dimethylhydantoin, and a glycol solvent. The preservative preferably has a total formaldehyde content of 5% and less than 0.2% of free formaldehyde. The composition is prepared by successively admixing the alkanol-substituted dimethyl-hydantoin and the stabilizer, the hydroxyl solvent, and the iodopropynyl compound. Also described is a stabilized iodopropynyl compound preferably containing dimethylhydantoin as the stabilizer.
A broad spectrum liquid preservative formulation comprising from about 20 to 95 parts of an alkanol-substituted dimethylhydantoin, from about 1 to 5 parts of an iodopropynyl compound, from about 5 to 20 parts of a stabilizer for the iodopropynyl compound, and from about 2 to 20 parts of a hydroxyl solvent.
A method of preparing a liquid preservative composition which comprises blending 20 to 95 parts of an alkanol-substituted dimethylhydantoin and 5 to 20 parts of a stabilizer of hydantoin, urea or a derivative thereof to form a homogeneous mixture, admixing a hydroxyl solvent and 1 to 5 parts of an iodopropynyl compound with the foregoing mixture to obtain a homogeneous solution containing a total formaldehyde content of at least 2% and less than 0.2% free formaldehyde.
A broad spectrum liquid preservative formulation comprising from about 75 to 85 parts of an alkanol-substituted dimethylhydantoin, from about 1 to 5 parts of 3-iodo-2-propynylbutyl carbamate, from about 5 to 20 parts of dimethylhydantoin, and from 2 to 20 parts of a glycol solvent.
Dependencies are inferred from the claim text.