DADMAC-Acrylamide Detergent Clarity via Surfactant Ratios
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Solution Overview
Problem
Existing laundry detergent compositions containing Diallyldialkylammonium Chloride (DADMAC) Acrylamide co-polymers and anionic surfactants often become cloudy due to the precipitation of anion-cation complexes, leading to instability and perceived poor quality, especially when water content exceeds 16%, which is undesirable for consumers seeking transparent and stable fabric softening products.
Innovation Solution
A liquid laundry detergent composition comprising a DADMAC Acrylamide co-polymer, a surfactant system with a non-ionic surfactant (NI) making up at least 30% and linear alkylbenzene sulfonate anionic surfactant (LAS) less than 40% by weight, along with an aqueous carrier, maintaining turbidity of 50 NTUs or less, and optionally including alcohol ethoxysulfate anionic surfactant (AES), without perfumes, to ensure stability and clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DADMAC Acrylamide co-polymer is added to detergent formulation, then fabric softening benefit is improved, but the composition becomes cloudy due to precipitation of anion-cation complexes
Solution Approach 1:
The patent applies parameter changes by carefully controlling the ratio of cationic polymer to anionic surfactant (maintaining less than 1:4 ratio) and adjusting the concentration of DADMAC co-polymer (0.01-10% by weight) to prevent precipitation while maintaining fabric softening benefits. This resolves the contradiction by optimizing formulation parameters to achieve both stability and functionality.
Solution Approach 2:
The patent uses composite materials by combining DADMAC Acrylamide co-polymer with specific anionic surfactants in controlled ratios, creating a stable composite formulation that prevents phase separation and cloudiness while delivering fabric softening. The composite approach allows the system to achieve properties that individual components cannot provide alone.
2Ease of operation
If water content is increased above 16%, then detergent composition becomes more dilute and easier to use, but cloudiness and precipitation increase
Solution Approach 1:
The patent addresses this contradiction by optimizing the water content parameter within a specific range that maintains both usability and stability. By controlling the overall formulation concentration and maintaining the cationic:anionic ratio below 1:4, the composition remains stable even at higher water contents, allowing easier application without sacrificing stability.
3Reliability
If anionic surfactant concentration is increased for better cleaning, then cleaning performance is improved, but interaction with cationic polymer increases causing more cloudiness
Solution Approach 1:
The patent resolves this contradiction by establishing a maximum ratio of cationic polymer to anionic surfactant of less than 1:4. This parameter control allows sufficient anionic surfactant for effective cleaning while preventing excessive interaction that would cause precipitation and cloudiness, thus maintaining both cleaning performance and composition 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 composition remains stable and clear, providing effective fabric softening benefits while maintaining a high water content, addressing consumer concerns about product quality and stability, and ensuring the detergent remains usable without premature disposal.
Implementation Method 1
a surfactant system comprising at least one non-ionic surfactant (NI) and at least one linear alkylbenzene sulfonate anionic surfactant (LAS)... the composition has a turbidity of about 50 NTUs or less
Implementation Method 2
Some of the known 2-in-1 detergent products have a cloudy appearance apparently caused by insoluble light-scattering materials... the composition has a turbidity of about 50 NTUs or less
Data Source
AI summary
Liquid laundry detergent compositions including a Diallyldialkylammonium Chloride (DADMAC) Acrylamide co-polymer, and a surfactant system comprising at least one non-ionic surfactant (NI) and at least one linear alkylbenzene sulfonate anionic surfactant (LAS) where the composition has a turbidity of about 50 NTUs or less. The NI is at least about 30 percent by weight of the surfactant system and the LAS is less than about 40 percent by weight of the surfactant system. The surfactant system can also include alcohol ethoxysulfate (AES).