Cationic Polyvinyl Alcohol in Liquid Dishwashing Detergent
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Solution Overview
Problem
Liquid hand dishwashing detergent compositions face challenges in providing effective foaming while ensuring easy rinsing, as anionic surfactants like alkyl sulphate anionic surfactants are difficult to rinse and cationically modified hydroxyethyl cellulose results in a slippery feel, compromising user experience.
Innovation Solution
A liquid hand dishwashing detergent composition comprising 5.0% to 50% by weight of a surfactant system with anionic surfactants and 0.01% to 5% cationic polyvinyl alcohol, containing less than 1.0 mol % hydrophobic monomers, which balances foaming and rinsing without the slippery feel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If anionic surfactants are used to provide effective foaming, then foaming is improved, but rinsing becomes difficult
Solution Approach 1:
The patent combines anionic surfactants with cationic polyvinyl alcohol to create a synergistic system where the cationic polymer modifies the properties of the anionic surfactant foam. This merging allows the foam to maintain stability and cleaning effectiveness while improving rinsability, as the cationic polymer acts as a modulator that prevents excessive foam persistence.
Solution Approach 2:
The patent changes the chemical parameters of the surfactant system by introducing cationic polyvinyl alcohol with specific molecular weight and degree of polymerization. This parameter change modifies the foam properties, allowing for improved rinsing characteristics while maintaining foaming effectiveness. The cationic charge and polymer structure alter the interfacial properties of the surfactant system.
2Ease of operation
If cationically modified hydroxyethyl cellulose is used to provide skin care benefits and foam rinsing, then foam rinsing is improved, but the solution feels slippery and greasy
Solution Approach 1:
The patent changes the polymer type from hydroxyethyl cellulose to polyvinyl alcohol, and specifically uses cationic polyvinyl alcohol with controlled molecular weight and degree of polymerization. This parameter change maintains the foam rinsing benefits while eliminating the slippery and greasy feel associated with hydroxyethyl cellulose derivatives. The cationic polyvinyl alcohol provides the necessary foam control without the adverse sensory properties.
Solution Approach 2:
The patent employs a polymer system that is easily rinsed away, effectively treating the polymer as a temporary foam modulator that performs its function during washing and then is removed with the rinse water. The cationic polyvinyl alcohol is designed to be water-soluble and rinsable, unlike persistent polymers that leave unwanted residues or sensory impressions.
3Duration of action of moving object
If polymers are used to improve suds longevity, then suds longevity is improved, but rinsability deteriorates
Solution Approach 1:
The patent optimizes the parameters of the cationic polyvinyl alcohol, specifically using molecular weights between 10,000-1,000,000 and degrees of polymerization between 10-1000. These parameter changes create a polymer that provides sufficient foam stability and longevity while maintaining adequate rinsability. The specific molecular weight range ensures the polymer is long enough to provide foam structure but short enough to be easily rinsed away.
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 composition achieves good foaming with improved rinsability, reducing the time and effort required for dishwashing and minimizing the slippery feel associated with prior polymer formulations.
Implementation Method 1
the surfactant system comprises anionic surfactant
Data Source
AI summary
A liquid hand dishwashing detergent composition includes from about 5.0% to about 50% by weight of the liquid hand dishwashing detergent composition of a surfactant system, wherein the surfactant system comprises anionic surfactant; and from about 0.01% to about 5% of a cationic polyvinyl alcohol, wherein the cationic polyvinyl alcohol comprises on average less than about 1.0 mol % of hydrophobic monomers.