Core Shell Microcapsules Density Balancing Fragrance Dispersion

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Solution Overview

Problem

Current microcapsules in liquid consumer products face challenges such as creaming or settling due to density differences between the microcapsules and the liquid phase, especially when the microcapsule walls are made from low-density materials, leading to uneven dispersion and potential leakage of fragrance contents during storage.

Innovation Solution

The development of core shell microcapsules with a formaldehyde-free shell made from low-density starting materials, where 50%-100% of the materials have a density of 1.05 g/cm³ or less, and a fragrance composition comprising 20-100% high-density cyclic fragrance ingredients, along with optional oil-soluble organic compounds, to achieve a balanced density within the range of 0.900 to 1.400 g/cm³, ensuring uniform dispersion and stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If microcapsule walls are made from low-density materials, then manufacturing cost and ease of manufacture are improved, but density balance with liquid phase deteriorates leading to creaming or settling

Engineering Contradiction:

Improveease of manufactureVSAvoiddispersion stability

Core Design Contradiction:

Ease of manufactureVSStability of the object's composition

Solution Approach 1:

The invention changes the density parameter of the fragrance composition by incorporating high-density cyclic fragrance materials (density >0.950 g/cm³) to balance the overall microcapsule density with the liquid phase, preventing creaming or settling while maintaining ease of manufacture with low-density wall materials

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention uses a composite fragrance composition combining high-density cyclic fragrance materials with other fragrance ingredients, creating a balanced density profile that matches the liquid phase while maintaining the benefits of low-density wall materials

Inventive Principle:

Principle #40Composite materials

2Stability of the object's composition

If microcapsule size is reduced to prevent creaming, then dispersion stability is improved, but encapsulation efficiency and content volume deteriorate

Engineering Contradiction:

Improvedispersion stabilityVSAvoidencapsulation volume

Core Design Contradiction:

Stability of the object's compositionVSQuantity of substance

Solution Approach 1:

The invention changes the density parameter of the microcapsule contents rather than reducing particle size, allowing larger microcapsules to maintain proper density balance and prevent creaming while preserving encapsulation volume and efficiency

Inventive Principle:

Principle #35Parameter changes

3Stability of the object's composition

If liquid product viscosity is increased to prevent settling, then dispersion stability is improved, but product texture and ease of operation deteriorate

Engineering Contradiction:

Improvedispersion stabilityVSAvoidproduct texture

Core Design Contradiction:

Stability of the object's compositionVSEase of operation

Solution Approach 1:

The invention changes the density parameter of the microcapsules to match the liquid phase, eliminating the need to increase viscosity for stabilization, thereby preserving product texture and ease of operation while achieving dispersion stability

Inventive Principle:

Principle #35Parameter changes

4Stability of the object's composition

If high-density materials are used in microcapsule core, then density balance with liquid phase is improved, but manufacturing complexity and material selection difficulty increase

Engineering Contradiction:

Improvedensity balanceVSAvoidmanufacturing complexity

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The invention changes the density parameter using common, well-established cyclic fragrance materials that are already widely used in the industry, avoiding the need for exotic or complex materials and keeping manufacturing processes simple and familiar

Inventive Principle:

Principle #35Parameter changes

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 solution maintains a homogeneous dispersion of microcapsules in liquid products, prevents creaming or settling, and ensures the stability and efficient release of fragrance contents, meeting the requirements for premium consumer products while avoiding the use of harmful chemicals.

Implementation Method 1

a fragrance composition comprising 20-100% high-density cyclic fragrance ingredients, along with optional oil-soluble organic compounds, to achieve a balanced density within the range of 0.900 to 1.400 g/cm³

Methodology Applied

Scientific EffectDensity balancing:

Implementation Method 2

a generally spherical shell of water and oil insoluble materials, typically a network polymer material, within which perfume or other hydrophobic material is contained

Methodology Applied

Scientific EffectPhysical containment: Physical Containment

Data Source

PatentEP2397120B2Fragrance-containing core shell microcapsules

Publication Date: 2019.07.31 TAKASAGO INTERNATIONAL CORP

AI summary

The present invention relates to core shell microcapsules for use in liquid consumer products, wherein: - the microcapsule shell is made of starting materials such that 50%-100% by weight of said materials have a density equal to or less than 1.05 g/cm3; - the microcapsule core contains a fragrance composition comprising 20-100% by weight of at least one cyclic fragrance material with a density greater than 0.950 g/cm3 and a ClogP in the range of from 1.00 to 6.00; - the weight ratio of core materials to shell materials is in the range from about 50:1 to about 1:1.