Inorganic-Shell Laundry Capsules for Fabric Deposition Retention

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Solution Overview

Problem

Existing water-soluble unit dose articles with petrochemically derived shell materials for capsules in laundry treatment compositions suffer from sub-optimal performance and environmental impact, necessitating a reduction in petrochemical content while maintaining or improving performance benefits.

Innovation Solution

The use of water-soluble fibrous non-woven substrates with core-shell capsules having an inorganic shell material, where the core contains a benefit agent, such as perfume, provides a synergistic effect that enhances capsule deposition and retention on fabrics during washing, improving overall fabric performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If petrochemically derived shell materials (melamine formaldehyde or polyacrylate) are used in capsules, then the capsules can be formulated into water-soluble unit dose products, but the performance benefits delivered are sub-optimal and the environmental impact is negative

Engineering Contradiction:

Improvecapsule performanceVSAvoidenvironmental impact

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the material composition parameter of the capsule shell from petrochemically derived materials (melamine formaldehyde or polyacrylate) to inorganic materials. This parameter change simultaneously improves environmental sustainability by reducing petrochemical content and enhances capsule performance for better fabric treatment benefits.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite material structure by combining inorganic shell material with organic core material containing the benefit agent. This composite approach allows the inorganic shell to provide improved environmental profile and enhanced performance characteristics while the core delivers the active fabric treatment composition.

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If petrochemically derived shell materials are used in capsules, then the capsules can be formulated into water-soluble unit dose products, but the capsule deposition and retention on fabrics is sub-optimal

Engineering Contradiction:

Improveformulability into water-soluble unit dose productVSAvoidcapsule deposition and retention

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent changes the shell material parameter from petrochemical polymers to inorganic materials, which fundamentally alters the capsule's interaction with fabric surfaces. This parameter change results in improved capsule deposition and retention on fabrics while maintaining the ability to be formulated into water-soluble unit dose products.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If inorganic shell material is used in capsules, then capsule deposition and retention on fabrics is improved, but the shell material must be compatible with water-soluble substrate dissolution

Engineering Contradiction:

Improvecapsule deposition and retentionVSAvoidcompatibility with water-soluble substrate

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent uses the water-soluble fibrous non-woven substrate as an intermediary that facilitates the release and deposition of inorganic shell capsules onto fabrics. The substrate dissolves in water to release the capsules, enabling the inorganic shell material to effectively deposit and retain on fabric surfaces without direct contact issues during the washing process.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 combination of a water-soluble polymer substrate with inorganic shell capsules results in improved capsule deposition and retention, leading to enhanced fabric treatment benefits like freshness, addressing the performance shortcomings of petrochemically derived encapsulation technologies.

Implementation Method 1

water-soluble fibrous non-woven substrate, the substrate including a plurality of fibers, where the fibers include a water-soluble polymer

Methodology Applied

Scientific EffectWater solubility: Solvation

Implementation Method 2

the combination of a water-soluble polymer substrate with inorganic shell capsules results in improved capsule deposition and retention

Methodology Applied

Scientific EffectDeposition: Deposition (physical)

Data Source

PatentUS12497579B2Fabric care unit dose articles with capsules

Publication Date: 2025.12.16 PROCTER & GAMBLE CO

AI summary

Water-soluble unit dose articles that include a water-soluble fibrous non-woven substrate and a particulate treatment composition, the composition including capsules, where the capsules have a shell that includes inorganic material. Related methods of treating a fabric.