Cationic Polymer Detergent for Fabric Whiteness and Softness

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Solution Overview

Problem

Conventional detergents fail to provide both effective cleaning and fabric softness benefits, as fabric softeners can lead to whiteness negatives and traditional cationic polymers deposit soils onto fabrics, compromising stain removal and whiteness maintenance.

Innovation Solution

A laundry detergent composition comprising a non-polysaccharide cationic polymer with a specific charge density and molecular weight range, combined with a surfactant system of anionic and nonionic surfactants, to achieve both cleaning and softness benefits while minimizing whiteness loss and soil deposition.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional detergents are used, then cleaning benefits are provided, but fabric softness benefits are lacking

Engineering Contradiction:

Improvecleaning benefitVSAvoidfabric softness

Core Design Contradiction:

Manufacturing precisionVSEase of operation

Solution Approach 1:

The patent combines cleaning agents and fabric softening agents into a single detergent composition. The cationic polymer serves dual functions: it acts as a deposition polymer to deposit silicone softening agents onto fabric during the wash cycle, while also providing cleaning benefits through its interaction with soils and surfactants. This merging eliminates the need for separate fabric softener products.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The cationic polymer performs multiple functions simultaneously: it serves as a deposition polymer for silicone, a cleaning agent, and a fabric softener. The polymer's cationic charge allows it to bind to anionic surfactants and silicone, facilitating their deposition onto fabric, while its structure provides cleaning benefits and softness through direct fabric interaction.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Ease of operation

If fabric softeners are added to provide softness benefits, then fabric softness is improved, but whiteness maintenance deteriorates over time

Engineering Contradiction:

Improvefabric softnessVSAvoidwhiteness maintenance

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The patent changes the molecular weight parameter of the deposition polymer from conventional high molecular weight to low molecular weight (5,000 to 500,000 daltons). This parameter change allows the polymer to deposit silicone more efficiently while reducing the tendency to trap and redeposit soils that cause whiteness loss. The specific molecular weight range optimizes both softness delivery and whiteness maintenance.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If traditional cationic deposition polymers are used, then silicone deposition efficiency is improved, but soil deposition onto fabric increases

Engineering Contradiction:

Improvesilicone deposition efficiencyVSAvoidsoil deposition

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent changes two critical parameters of the cationic polymer: molecular weight (reducing to 5,000-500,000 daltons) and charge density (optimizing cationic charge). These parameter changes modify the polymer's interaction characteristics with soils versus silicone. The lower molecular weight reduces the polymer's ability to flocculate and redeposit clay and soils, while the optimized charge density maintains effective silicone binding and deposition.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a composite surfactant system comprising both anionic and nonionic surfactants in combination with the low molecular weight cationic polymer. This composite approach creates a balanced system where the anionic surfactant provides cleaning, the nonionic surfactant aids in soil suspension and prevention, and the cationic polymer facilitates silicone deposition, collectively preventing soil redeposition while maintaining high silicone deposition efficiency.

Inventive Principle:

Principle #40Composite materials

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 effectively maintains fabric whiteness and provides softness benefits by optimizing the deposition of silicone and surfactants, ensuring efficient cleaning and softness without compromising stain removal or fabric whiteness.

Implementation Method 1

Cationic deposition polymers can be used to increase deposition efficiency of silicones onto fabrics

Methodology Applied

Scientific EffectCationic deposition: Electrostatic Deposition

Implementation Method 2

traditional cationic polymers can flocculate clay, since the cationic polymers interact with the anionic surfactants in the detergent, leading to clay redeposition

Methodology Applied

Scientific EffectFlocculation: Flocculation

Data Source

PatentUS9951297B2Detergent composition compromising a cationic polymer containing a vinyl formamide nonionic structural unit

Publication Date: 2018.04.24 PROCTER & GAMBLE CO

AI summary

Fabric care compositions comprising a cationic polymer, a silicone, and a surfactant system. Methods of making and using such compositions.