Liquid detergent with polyanionic ammonium surfactant and a high pKa solid inorganic base

• US 6,969,700 B2
• Filed: 02/12/2004
• Issued: 11/29/2005
• Est. Priority Date: 02/12/2004
• Status: Expired due to Fees

• Current Assignee: Unilever Home & Personal Care USA (Unilever PLC)
• Original Assignee: Unilever Home & Personal Care USA (Unilever PLC)
• Inventors: Hsu, Feng-Lung Gordon, Sun, Guanglin, Hsu, Gregory
• Primary Examiner(s): OGDEN JR, NECHOLUS
• Application Number:
  US10/777,573
• Publication Number:
  US 20050181965A1
• Time in Patent Office: 656 Days
• Field of Search: 510/267, 510/424, 510/426, 510/499, 510/357, 510/394, 510/494
• US Class Current: 510/357
• CPC Class Codes: C11D 1/04 Carboxylic acids or salts thereof soap C11D9/00
• CPC Class Codes: C11D 1/146 Sulfuric acid esters
• CPC Class Codes: C11D 1/22 derived from aromatic compounds
• CPC Class Codes: C11D 1/29 Sulfates of polyoxyalkylene ethers
• CPC Class Codes: C11D 17/0004 Non aqueous liquid compositions comprising insoluble particles
• CPC Class Codes: C11D 3/044 Hydroxides or bases
• CPC Class Codes: C11D 3/10 Carbonates ; Bicarbonates

Abstract

A liquid laundry detergent composition comprising from about 0.1% to about 80%, by weight of the composition, of a polyanionic ammonium surfactant; a substantially non-aqueous carrier; and a solid inorganic base having pKa equal to or greater than 10.

Claims

1. A liquid detergent composition comprising:

(a) from about 0.1% to about 80%, by weight of the composition, of a polyanionic ammonium surfactant;

(b) a liquid carrier comprising at most about 5% water;

(c) from about 0.1 to about 10% of a solid inorganic base having pKa equal to or greater than 10.

2. The composition of claim 1 wherein the polyanionic ammonium surfactant is selected from the group consisting of polyanionic ammonium alkyl benzene sulfonate, polyanionic ammonium alkyl sulfate, polyanionic ammonium fatty acid salt, polyanionic ammonium alkyl polyalkoxy sulfate and mixtures thereof.

3. The composition of claim 1 wherein the polyanionic ammonium surfactant is dispersed in a liquid carrier.

4. The composition of claim 1 wherein the polyanionic ammonium surfactant is solubilized in a liquid carrier.

5. The composition of claim 4 further comprising a solubilizing agent.

6. The composition of claim 5 wherein the weight ratio of the solubilizing agent to the polyanionic ammonium surfactant is in the range of from 1:

10 to 10;

1.

7. The composition of claim 1 wherein the inorganic base has a particle size less than 500 microns.

8. The composition of claim 1 wherein the inorganic base is sodium carbonate.

9. A method of washing laundry in a front-loading washing machine, the method comprising adding to the washing machine the composition of claim 1.