Soap bars comprising insoluble multivalent ion soap complexes

• US 7,662,761 B2
• Filed: 05/31/2005
• Issued: 02/16/2010
• Est. Priority Date: 05/31/2005
• Status: Expired due to Fees

• Current Assignee: Conopco (Unilever PLC)
• Original Assignee: Conopco (Unilever PLC)
• Inventors: Subramanian, Vivek, Shah, Pravin
• Primary Examiner(s): Ogden, Jr.; Necholus
• Application Number:
  US11/140,864
• Publication Number:
  US 20060270572A1
• Time in Patent Office: 1,722 Days
• Field of Search: None
• US Class Current: 510/141
• CPC Class Codes: C11D 17/006 containing mainly surfactants, but no builders, e.g. syndet bar
• CPC Class Codes: C11D 9/002 Non alkali-metal soaps
• CPC Class Codes: C11D 9/10 Salts

Abstract

The invention relates to novel bar compositions comprising complexes formed from interaction of multivalent ions and soap. The insoluble complexes permit greater solid contents which counterintuitively, enhance lather (i.e., even if soluble soap is complexed, it is believed more can be used). Further, the complexes enhance rate of wear, hardness, mildness and deposition. The invention further comprises process for enhancing benefits by adding multivalent ions to soap stock during processing.

Claims

1. A bar composition consisting essentially of:

(a) 40 to 80% by wt. fatty acid soap;

(b) less than 3% by wt. synthetic surfactant;

(c) 5 to 30% by wt. structurant selected from the group consisting of free fatty acids, polyalkylene oxides, glycerol alkanoates and mixtures thereof; and

(d) 5 to 16% by wt. water;

wherein 8 to 60% by wt. of said bar comprises a complex formed from the interaction of soluble soap and multivalent ion, said soluble soap being saturated C₈ to C₁₄ soap and/or unsaturated soap;

wherein composition comprises less than 2% by wt. builder;

wherein compositions is substantially enzyme free;

wherein said multivalent ion does not comprise magnesium;

wherein soap and multivalent ion are added before addition of synthetic surfactant, if any;

wherein a chloride of the multivalent ion is reacted with soap noodles and optional water at 30-35°

C. to form said complex directly as part of the soap solid formation process.

2. A bar composition according to claim 1, wherein fatty acid soap comprises mixture of C₁₆ to C₂₄ long chain length C₈-C₁₄ and short chain length soaps.

3. A process to enhance lather, mildness, rate of wear and hardness in the bar of claim 1 which process comprises adding complex inducing multivalent ion to the fatty acid soap to form multivalent ion-soap complex prior to addition of synthetic surfactant, if any.