Antimicrobial Cleanser Formulation with QAC and Phospholipid
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Solution Overview
Problem
Current antimicrobial compositions for skin cleansing often face challenges such as skin irritation, dryness, and lack of foam or pleasant feel, leading to consumer dissatisfaction, particularly with Triclosan and Triclocarban, which are being disfavored by consumers seeking alternatives.
Innovation Solution
A mild and efficacious antimicrobial formulation combining a quaternary ammonium compound (QAC) like benzethonium chloride with a quaternized phospholipid surfactant and an amphoteric surfactant, along with a quaternized polymer, and skin adjuvants like glycerol and urea, to provide antimicrobial properties, reduced irritancy, and improved skin feel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Triclosan and Triclocarban are used as antimicrobial agents, then effective antimicrobial activity is achieved, but consumer acceptance deteriorates due to being disfavored by consumers
Solution Approach 1:
The patent changes the chemical parameters by replacing Triclosan and Triclocarban with quaternary ammonium compounds (QACs) such as benzethonium chloride, alkyl dimethyl benzyl ammonium chloride, and dialkyl dimethyl ammonium chloride. This substitution maintains antimicrobial efficacy while improving consumer acceptance, as QACs are perceived as gentler and more skin-friendly alternatives.
Solution Approach 2:
The patent employs composite surfactant systems combining multiple quaternary ammonium compounds with specific surfactants (nonionic, amphoteric, or anionic) and polymers. This composite approach creates synergistic effects that enhance antimicrobial activity while providing additional benefits like foam generation, skin conditioning, and reduced irritation, thereby improving overall consumer acceptance.
2Reliability
If strong antimicrobial agents are used, then effective antimicrobial activity is achieved, but skin irritation increases
Solution Approach 1:
The patent uses surfactants as intermediary substances that mediate between the antimicrobial QACs and the skin. These surfactants (nonionic, amphoteric, or anionic) form micellar structures that encapsulate or moderate the interaction of QACs with skin cells, reducing direct irritation while maintaining antimicrobial efficacy through the combined action of multiple ingredients.
Solution Approach 2:
The patent optimizes the concentration parameters of QACs to lower levels (e.g., 0.01-5% w/w) compared to traditional antimicrobial formulations, and combines them with surfactants and polymers that modify the physical-chemical parameters of the formulation. This results in gentler formulations that maintain antimicrobial activity while reducing skin irritation potential.
3Productivity
If conventional surfactants are used for cleansing, then cleansing efficacy is achieved, but skin dryness and cracking increase
Solution Approach 1:
The patent employs composite surfactant systems combining quaternary ammonium compounds with nonionic surfactants (e.g., alkyl polyglucosides, ethoxylated alcohols), amphoteric surfactants (e.g., alkyl amine oxides, betaines), and anionic surfactants (e.g., alkyl sulfonates). This multi-component surfactant blend provides effective cleansing through synergistic action while the diverse molecular structures maintain skin lipid barriers and prevent dryness and cracking.
Solution Approach 2:
The patent formulations incorporate ingredients with different local functions: QACs provide antimicrobial activity, nonionic surfactants provide gentle cleansing and foam, amphoteric surfactants provide buffering and mildness, and polymers provide skin conditioning and moisture retention. Each ingredient targets specific local needs, collectively achieving effective cleansing without skin damage.
4Device complexity
If antimicrobial compositions lack foam or pleasant feel, then formulation simplicity is maintained, but consumer satisfaction deteriorates
Solution Approach 1:
The patent selects quaternary ammonium compounds and surfactants that perform multiple functions simultaneously: QACs provide both antimicrobial activity and foaming properties, while surfactants provide cleansing, foam generation, and skin conditioning. This multi-functionality allows the formulation to achieve consumer satisfaction regarding foam and feel without significantly increasing formulation complexity, as the same ingredients serve multiple purposes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The formulation achieves effective antimicrobial activity while being gentle on the skin, reducing irritation and providing a pleasant after-feel, as demonstrated by in vitro assays and consumer panel results, with improved foam structure and moisture retention.
Implementation Method 1
a quaternary ammonium compound (QAC) 'active' to provide an antimicrobial property
Implementation Method 2
a first surfactant as a quaternized phospholipid which provides a reduction in potential irritancy of other ingredients as well as foaming and cleansing properties
Implementation Method 3
a second non-ionic or amphoteric surfactant (such as an alkyl amine oxide or linear alkyl polyglucoside) that provides an increased cleansing property
Implementation Method 4
a quaternized polymer (such as hydroxypropyl methylcellulose or hydroxypropyl guar hydroxypropyl trimonium chloride) which can provide thickening, foam structure and after-feel properties
Implementation Method 5
The adjuvants include, for example, glycerol and its ester derivatives (such as polyglyceryl-4 caprate), ethoxylated esters such as (PEG-7 glyceryl cocoate or glycereth-18 ethylhexanoate (and) glycereth-18), urea, and/or ethoxylated glucose derivatives (such as methyl gluceth-10 and methyl gluceth-20)
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
Compositions containing a quaternary ammonium compound (QAC) "active" to provide an antimicrobial property, a quaternized phospholipid which provides a reduction in potential irritancy of other ingredients as well as foaming and cleansing properties, a second non-ionic or amphoteric surfactant (such as an alkyl amine oxide or linear alkyl polyglucoside) to provide increased foam volume and cleansing properties, a non-ionic or quaternized polymer (such as hydroxypropylmethylcellulose or hydroxypropyl guar hydroxypropyl trimonium chloride) which can provide thickening, foam structure and improved after-feel properties are described.