Ampholytic Polymer Stabilizes Cationic Anionic Laundry Mixtures
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Solution Overview
Problem
Existing laundry compositions that combine cationic softening agents and anionic surfactants often suffer from incompatibility issues, leading to reduced cleaning effectiveness, increased turbidity, and phase separation, while also failing to effectively inhibit clay soil redeposition.
Innovation Solution
A laundry composition incorporating an ampholytic polymer with specific monomer ratios and weight percentages of cationic, anionic, and nonionic monomers, which maintains stability and enhances the compatibility of surfactants and softening agents, thereby improving cleaning and softening performance without phase separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cationic softening agent and anionic surfactant are combined in laundry composition, then cleaning and softening effectiveness are improved, but the composition exhibits turbidity and phase separation
Solution Approach 1:
The patent introduces a nonionic polymer as a compatibility agent that acts as an intermediary between the cationic softening agent and anionic surfactant. This polymer mediates the interaction between the oppositely charged ingredients, preventing phase separation and turbidity while allowing both cleaning and softening functions to coexist effectively in the laundry composition.
Solution Approach 2:
The patent specifies precise compositional parameters including the weight ratio of cationic to anionic ingredients (0.1:1 to 10:1), the amount of nonionic polymer (0.1-10% by weight), and molecular weight constraints. By controlling these parameters, the composition achieves stability despite combining incompatible ingredients, resolving the contradiction between effectiveness and stability.
2Adaptability or versatility
If cationic softening agent and anionic surfactant are combined in laundry composition, then dual functionality is achieved, but cleaning effectiveness and clay soil redeposition inhibition are reduced
Solution Approach 1:
The nonionic polymer serves as a compatibility agent that enables the cationic softening agent and anionic surfactant to work together without interfering with each other's functions. This mediator allows the composition to maintain both softening and cleaning effectiveness simultaneously, achieving dual functionality without sacrificing performance.
3Adaptability or versatility
If incompatible ingredients are combined in laundry composition, then formulation versatility is improved, but desirable properties are significantly lost
Solution Approach 1:
The patent establishes specific parameter ranges including ingredient ratios (0.1:1 to 10:1), polymer concentration (0.1-10% by weight), and molecular weight constraints. By controlling these parameters, the composition achieves formulation versatility with incompatible ingredients while maintaining desirable properties such as stability, clarity, and effectiveness.
Solution Approach 2:
The patent creates a composite laundry composition that integrates multiple incompatible ingredient types (cationic softening agents, anionic surfactants, and nonionic polymers) into a unified stable formulation. This composite approach allows versatile ingredient combinations while preserving the functional properties of each component through the compatibility agent.
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 ampholytic polymer-based composition effectively inhibits clay soil redeposition and maintains low turbidity, ensuring robust cleaning and softening capabilities while maintaining desirable properties like clarity.
Implementation Method 1
at least one ampholytic polymer comprising, as polymerized units, a) 20% to 90% by weight, based on the solid weight of said ampholytic polymer, at least one cationic monomer, b) 10% to 70% by weight, based on the solid weight of said ampholytic polymer, at least one anionic monomer, and c) 0% to 90% by weight, based on the solid weight of said ampholytic polymer, at least one nonionic monomer; wherein the equivalent ratio of said monomer a) to said monomer b) is from 0.33:1 to 1.2:1; and wherein said ampholytic polymer has weight-average molecular weight of 50,000 or less
Implementation Method 2
provide better inhibition of clay soil redeposition than that provided by previously-known laundry compositions
Implementation Method 3
maintains stability and enhances the compatibility of surfactants and softening agents, thereby improving cleaning and softening performance without phase separation
Data Source
AI summary
There is provided a laundry composition comprisingi) at least one laundry component selected from the group consisting of surfactants, softening agents, and mixtures thereof andii) at least one ampholytic polymer comprising, as polymerized units,a) 20% to 90% by weight, based on the solid weight of said ampholytic polymer, at least one cationic monomer,b) 10% to 70% by weight, based on the solid weight of said ampholytic polymer, at least one anionic monomer, andc) 0% to 90% by weight, based on the solid weight of said ampholytic polymer, at least one nonionic monomer;wherein the equivalent ratio of said monomer a) to said monomer b) is from 0.33:1 to 1.2:1; and wherein said ampholytic polymer has weight-average molecular weight of 50,000 or less. Further provided is a method of laundering textiles comprising treating said textiles with such laundry compositions.