Low-pH Liquid Laundry Detergent With LAS for Malodor Control
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Solution Overview
Problem
Low pH detergent compositions, which provide benefits such as improved malodor control and calcium soap release, are not compatible with antioxidants due to reduced deposition, compromising their effectiveness.
Innovation Solution
A liquid laundry detergent composition comprising a hindered phenol antioxidant in combination with a specific surfactant system, particularly high levels of C6-C20 linear alkylbenzene sulfonate (LAS), at a pH of 1.5 to 5.0, ensures compatibility and enhances malodor control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If low pH is used in detergent composition, then malodor control and calcium soap release are improved, but antioxidant deposition is reduced
Solution Approach 1:
The patent changes the chemical parameters of the antioxidant by using esterified forms (methyl ester, ethyl ester, propyl ester, butyl ester, octyl ester, or decyl ester of 3,5-bis(1,1-dimethylethyl)-4-hydroxy-benzenepropanoic acid) which have improved stability and deposition characteristics at low pH compared to non-esterified antioxidants. This molecular modification allows the antioxidant to maintain effectiveness in the low pH environment (pH 2.0-4.0) while still providing adequate deposition on fabrics.
2Ease of operation
If low pH is used in detergent composition, then fabric feel and pH-sensitive stain performance are improved, but antioxidant compatibility is reduced
Solution Approach 1:
The patent modifies the chemical structure of the antioxidant by introducing ester groups, which changes its acid-base properties and stability characteristics. The esterified antioxidants remain stable and effective at low pH levels (2.0-4.0) where conventional antioxidants would degrade or fail to deposit, thereby maintaining both fabric feel benefits and antioxidant compatibility simultaneously.
3Ease of manufacture
If conventional antioxidants are used in low pH detergent, then malodor control is compromised, but formulation simplicity is maintained
Solution Approach 1:
The patent employs esterified forms of 3,5-bis(1,1-dimethylethyl)-4-hydroxy-benzenepropanoic acid which can be incorporated into low pH detergent formulations using standard manufacturing processes. The esterification provides enhanced stability and deposition at low pH, enabling effective malodor control without complicating the formulation or manufacturing process.
Data Source
AI summary
The present invention relates to a cleaning composition, and particularly a liquid laundry detergent composition that is useful for treating fabrics with improved malodor control benefit.