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US 4,318,818 AGranted
Stabilized aqueous enzyme composition
AssigneeThe Procter & Gamble Company
InventorsJames C. Letton, Mark J. Yunker
Life of this patent
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Abstract
Stabilized aqueous enzyme compositions contain a stabilizing system comprising calcium ions and a low molecular weight carboxylic acid or salt, preferably a formate, preferably with a low molecular weight alcohol, and in a pH range of from about 6.5 to about 10. Most preferred is a detergent composition containing the stabilized enzymes.
Claims15
A stabilized aqueous enzyme composition consisting essentially of;
- (a) from 0% to about 75% of a detergent surfactant selected from the group consisting of nonionic, anionic, cationic, zwitterionic, amphoteric and semipolar nonionic surfactants and mixtures thereof;
- (b) from about 0.025 to about 10% pure enzyme selected from the group consisting of proteolytic and amylolytic enzymes and mixtures thereof;
- (c) from 0 to about 60% of a low molecular weight primary or secondary alcohol selected from the group consisting of methanol, ethanol, propanol, isopropanol, polyols containing from 2 to about 6 carbon atoms and from 2 to about 6 hydroxy groups and mixtures thereof;
- (d) from about 0.1% to about 10% of a short chain length carboxylic acid salt selected from the group consisting of formates, acetates, propionates and mixtures thereof;
- (e) a soluble calcium salt to give from about 0.1 to about 10 millimoles of calcium ion per liter;
- and
- (f) the balance water,
- the pH of the product being from about 6.5 to about 10, the amount of calcium ion per liter being less than about 2 millimoles at pH's below about 8.5, and at pH's above 8.5, (d) is a formate.
5 more elements
A stabilized aqueous enzyme composition consisting essentially of;
- (a) from 0% to about 75% of a detergent surfactant selected from the group consisting of nonionic, anionic, cationic, zwitterionic, amphoteric and semipolar nonionic surfactants and mixtures thereof;
- (b) from about 0.025 to about 10% pure enzyme selected from the group consisting of proteolytic and amyolytic enzymes and mixtures thereof;
- (c) from 0 to about 60% of a low molecular weight primary or secondary alcohol selected from the group consisting of methanol, ethanol, propanol, isopropanol, polyols containing from 2 to about 6 carbon atoms and from 2 to about 6 hydroxy groups and mixtures thereof;
- (d) from about 0.1% to about 10% of a formate;
- (e) a soluble calcium salt to give from about 0.1 to about 10 millimoles of calcium ion per liter;
- and
- (f) the balance water, the pH of the product being from about 6.5 to about 10.
4 more elements
Dependencies are inferred from the claim text.