Laundry Detergent Silicone Deposition via Segmented Surfactant System
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Solution Overview
Problem
Existing laundry detergents with fabric softening actives, such as silicones, often fail to deposit effectively on fabrics during the wash cycle, leading to wasteful removal in rinse water, and there is a need to improve the deposition efficiency of these actives.
Innovation Solution
A method involving a washing step with a detergent composition containing anionic and nonionic surfactants in a specific ratio, followed by a rinsing step with a fabric softener composition, enhances silicone deposition on fabrics, providing improved softness and freshness benefits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If a detergent composition containing silicone is used in the washing step, then fabric softening benefit is provided, but most of the silicone is carried away by rinse water instead of depositing on the fabric
Solution Approach 1:
The patent divides the fabric treatment process into two separate stages: (1) a washing step using a detergent composition containing anionic/nonionic surfactant system and silicone, and (2) a subsequent rinsing step using a softener composition containing cationic surfactant and silicone. This segmentation allows each composition to perform its specialized function - the detergent provides cleaning and initial silicone adhesion, while the softener composition optimizes silicone deposition through cationic-silicone interaction, thereby improving overall deposition efficiency and reducing silicone waste in rinse water.
Solution Approach 2:
The patent introduces the softener composition as an intermediary between the detergent and the final fabric state. The softener composition, containing cationic surfactant and silicone, acts as a mediator that facilitates proper silicone deposition on the fabric. The cationic surfactant in the softener composition interacts with the anionic surfactant residues on the fabric, creating favorable conditions for silicone deposition, thus improving deposition efficiency and reducing silicone loss.
2Ease of operation
If a single 2-in-1 detergent product is used to provide both cleaning and softening, then convenience is improved, but silicone deposition efficiency deteriorates
Solution Approach 1:
The patent segments the fabric treatment into two specialized compositions: a detergent composition for cleaning with anionic/nonionic surfactants and silicone, and a softener composition for optimization with cationic surfactant and silicone. This segmentation resolves the contradiction by allowing each product to be optimized for its specific function, achieving high silicone deposition efficiency while maintaining operational convenience through clear, separate usage instructions.
Solution Approach 2:
The patent changes the surfactant system parameters between the two compositions. The detergent uses anionic/nonionic surfactants suitable for cleaning, while the softener uses cationic surfactants that promote silicone deposition. This parameter change optimizes each stage for its specific goal, improving silicone deposition efficiency while maintaining the convenience of a two-step process with clearly defined roles.
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
This approach significantly increases silicone deposition on fabrics, resulting in enhanced softness and freshness, while minimizing waste, by optimizing the combination of surfactants and the sequential use of detergent and softener compositions.
Implementation Method 1
the detergent composition comprises a surfactant system and a silicone, where the surfactant system comprises anionic surfactant and nonionic surfactant
Implementation Method 2
contacting the fabric with an effective amount of a detergent composition, thereby forming a washed fabric
Implementation Method 3
silicone deposition efficiency can be surprisingly improved using a method of treating fabrics with a wash-added detergent comprising silicone
Data Source
AI summary
A method of treating a fabric, where the method includes a washing step and a rinsing step. A multi-component fabric treatment system, wherein the system includes a first component comprising a detergent composition, and where the system further includes a second component comprising a softener composition.