Water-Soluble Detergent Film Blend for Fast Cold-Wash Dissolution

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Solution Overview

Problem

Water-soluble unit-dose detergent articles experience delayed dissolution and residue formation due to gelling during initial contact with water, particularly in short and cold temperature cleaning processes, leading to residue deposition on fabrics or washing machines.

Innovation Solution

A multi-compartment water-soluble unit dose detergent article is designed with a polyvinyl alcohol polymer blend comprising specific ratios of polymers A and B, sealed via solvent sealing, to enhance dissolution and prevent residue formation, featuring compartments enveloped by a water-soluble film.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a water-soluble film is used to envelop detergent, then the detergent can be delivered in a convenient unit-dose format, but the film dissolves slowly and forms gels that delay cleaning onset

Engineering Contradiction:

Improveconvenience of unit-dose deliveryVSAvoiddissolution speed

Core Design Contradiction:

Ease of operationVSSpeed

Solution Approach 1:

The patent modifies the polymer composition parameters by blending polyvinyl alcohol with specific ratios of acrylic acid and itaconic acid copolymers, controlling the degree of hydrolysis and molecular weight to optimize dissolution rate while maintaining film integrity for convenient unit-dose delivery

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite water-soluble film material combining polyvinyl alcohol base polymer with functional copolymers containing carboxylic acid groups, achieving synergistic effects that simultaneously provide convenient handling and rapid dissolution without gel formation

Inventive Principle:

Principle #40Composite materials

2Reliability

If the detergent contacts water during initial dissolution, then the cleaning process can begin, but gelling occurs that slows down further dissolution and leaves residues

Engineering Contradiction:

Improvecleaning process initiationVSAvoidgel formation and residue deposition

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent converts the potentially harmful gel-forming interaction between detergent and polyvinyl alcohol into a beneficial rapid dissolution process by adding carboxylic acid-containing copolymers that disrupt gel network formation while enhancing water penetration and detergent release

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The invention adjusts the chemical composition parameters of the film by incorporating copolymers with ionizable carboxylic acid groups that change the electrostatic interactions and hydrogen bonding characteristics, preventing gel formation and residue deposition while ensuring reliable cleaning initiation

Inventive Principle:

Principle #35Parameter changes

3Loss of energy

If short and cold temperature cleaning programs are used, then energy consumption is reduced, but dissolution is delayed and residues are deposited on fabrics

Engineering Contradiction:

Improveenergy consumption in cleaning programsVSAvoiddissolution speed in cold water

Core Design Contradiction:

Loss of energyVSSpeed

Solution Approach 1:

The patent modifies the film's chemical composition to include copolymers with lower glass transition temperatures and enhanced hydrophilicity, enabling the film to maintain flexibility and solubility in cold water conditions, achieving rapid dissolution without requiring high energy input for heating

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention develops a composite polymer system where the combination of polyvinyl alcohol with carboxylic acid-containing copolymers creates a material with enhanced cold-water solubility and reduced crystallinity, allowing effective dissolution in energy-efficient cold wash programs without residue formation on fabrics

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 solution ensures rapid dissolution of detergent contents without residue formation, even in short and cold washing programs, maintaining cleanliness and reducing user intervention.

Implementation Method 1

The water-soluble unit dose article comprises a water-soluble film and a detergent composition. The detergent composition is enveloped by the water-soluble film. The first film comprises a polyvinyl alcohol polymer blend

Methodology Applied

Scientific EffectSolvation: Solvation

Implementation Method 2

polymer A has an average degree of hydrolysis of from 60% to less than 80%, preferably of from 70% to less than 80%, more preferably of from 75% to less than 80%; and a 4% solution viscosity at 20°C of from 3cP to 20cP

Methodology Applied

Scientific EffectHydrolysis: Hydrolysis

Data Source

PatentEP4650425A1Multi-compartment water-soluble unit dose article

Publication Date: 2025.11.19 PROCTER & GAMBLE CO

Figure 1~3

AI summary

A multi-compartment water-soluble unit-dose detergent article comprising a plurality of compartments in generally superposed relationship. The water-soluble unit-dose detergent article comprises a water-soluble film enveloping a fabric care or household care detergent composition. The detergent composition comprises a cleaning surfactant. The water-soluble film comprises a first film comprising a specific polyvinyl alcohol polymer blend.