Liquid Laundry Detergent Pod Film Dissolution via Carbonate Water Binding
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Solution Overview
Problem
High water content liquid laundry detergents are incompatible with water-soluble films due to their water content, limiting their availability in unit dosage form and preventing the benefits of faster delivery and dispersibility in cold water washing.
Innovation Solution
The use of an aqueous liquid detergent composition with a high water content (50-65 wt. %) and high potassium carbonate builder level (25-35 wt. %), combined with electrolyte-tolerant surfactants, glycerin, and propylene glycol diacetate (PGDA), encapsulated in a water-soluble poly(vinyl alcohol) film, which improves cold-water dissolution of the film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high water content liquid laundry detergent is used, then faster delivery and dispersibility to laundry wash liquor is achieved, but incompatibility with water-soluble films occurs
Solution Approach 1:
The patent introduces water-binding agents (carbonate builders like sodium carbonate or potassium carbonate) as intermediary substances that bind excess water in the detergent composition. This mediation prevents the water from dissolving the water-soluble film package while allowing the detergent to maintain its liquid consistency and dispersibility benefits. The carbonate builder acts as a buffer that controls water availability.
Solution Approach 2:
The patent modifies the chemical composition parameters by incorporating specific concentrations of carbonate builders (1-30 wt%) and adjusting the balance between surfactants, water, and builders. This parameter change transforms the detergent from being incompatible with water-soluble films to compatible, while preserving the liquid form's advantages.
2Reliability
If water-soluble alkaline carbonate builder is added to prevent film dissolution, then film stability is improved, but cleaning power may be reduced
Solution Approach 1:
The patent optimizes the concentration range of carbonate builders (1-30 wt%) and balances them with appropriate surfactant levels (1-40 wt%) to achieve both film stability and cleaning effectiveness. By carefully controlling these parameters, the formulation maintains alkalinity for cleaning while preventing excessive water availability that would dissolve the film.
Solution Approach 2:
The patent creates a composite detergent system combining multiple components: surfactants for cleaning, carbonate builders for water binding and pH control, and optional additives. This composite approach allows the system to simultaneously achieve film compatibility and effective cleaning performance that neither component could achieve alone.
3Quantity of substance
If high carbonate builder level is used in liquid detergent, then water binding capability is improved, but phase separation occurs
Solution Approach 1:
The patent maintains carbonate builder levels within 1-30 wt% and balances them with surfactants (1-40 wt%) and water (35-65 wt%) to achieve optimal phase stability. This parameter optimization ensures sufficient water binding without excessive carbonate concentration that would cause precipitation or phase separation.
Solution Approach 2:
The patent formulates a homogeneous liquid composition where all components (surfactants, carbonate builders, water, and additives) are uniformly distributed. This homogeneity prevents phase separation and ensures consistent performance, maintaining both water binding capability and compositional stability.
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 improved cold-water dissolution of the encapsulating film, maintaining the detergent's homogeneity and preventing film dissolution before use, thus enabling stable and effective liquid laundry detergent pods.
Implementation Method 1
The use of a water-soluble alkaline carbonate builder in the detergent composition can help prevent the aqueous detergent composition from dissolving the water-soluble package material
Implementation Method 2
propylene glycol diacetate (PGDA), which improves cold-water dissolution of the film
Implementation Method 3
Such builders improve the cleaning power of the detergent composition, for instance, by the sequestration or precipitation of hardness causing metal ions such as calcium, peptization of soil agglomerates, reduction of the critical micelle concentration, and neutralization of acid soil, as well as by enhancing various properties of the active detergent, such as its stabilization of solid soil suspensions, solubilization of water-insoluble materials, emulsification of soil particles
Data Source
AI summary
An article is provided including an aqueous liquid detergent; and a package for the aqueous liquid detergent which is in direct contact with the aqueous liquid detergent, wherein the package is formed from a water-soluble, film-forming material. The aqueous liquid detergent includes: at least about 40% by weight of water based on the total weight of the aqueous liquid detergent; a builder comprising potassium carbonate, wherein the potassium carbonate is present in an amount of at least about 25 weight percent, based on the total weight of the aqueous liquid detergent; propylene glycol diacetate; and at least one surfactant.