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US 7,119,051 B2Granted
Process for making bar composition having little or no efflorescence
AssigneeUnilever Home & Personal Care USA, Division of Conopco, Inc.
InventorsTerence James Farrell, Michael Irwin Hill
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Abstract
The invention relates to novel method of incorporating free fatty acid into soap-based bars to minimize or eliminate efflorescence and to compositions made by the process.
Claims9
A process for making bar composition comprising:
- (1) 25 to 85% by wt. fatty acid soap;
- (2) 1 to 15% C8 to C20 free fatty acid;
- (3) 0.01 to 7% protic acid salt, wherein protic acid has pKa less than that of the fatty acid component of the fatty acid soap;
- (4) 0.2 to 20% by wt. aluminum hydroxide;
- (5) 2 to 8% polyalkylene glycol;
- and
- (6) 5 to 20%% by wt. water;
- wherein said composition results in little or no efflorescence measured after 4 weeks of storage at about 35–45° C. and 70% relative humidity.
- wherein said process comprises:
- (i) adding fatty acid soap to a reactor;
- (ii) combining protic acid having a pKa lower than that of fatty acid component of said fatty acid with said fatty acid soap at about 40° C. to generate free fatty acid and alkali metal salt of said protic acid, and wherein said free fatty acid of (2) is generated from the fatty acid soap of (1);
- (iii) adding aluminate solution comprising water, alkali metal hydroxide and aluminate;
- and
- (iv) adding other component of soap bar solution, wherein steps (i) to (iv) may be interchangeable combined in any order of addition;
- and
- (v) cooling ingredients mixed in steps (i) to (iv) followed by formation and diminishing of bar composition.
13 more elements
Dependencies are inferred from the claim text.