Core-Shell Microcapsule Stabilizer Using Polysaccharide and Aminosilane

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Solution Overview

Problem

Existing encapsulation methods face challenges in using natural materials derived from sustainable sources while maintaining the stability and controlled release of benefit agents, particularly in consumer products, due to difficulties in forming capsules that are impervious and efficient during storage and application.

Innovation Solution

The development of core-shell microcapsules using a polymeric stabilizer formed by combining a polymeric surfactant with aminosilanes, specifically polysaccharides comprising carboxylic acid groups, which enhances the encapsulation efficiency and stability, allowing for controlled release of benefit agents.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If natural materials or materials derived from nature are used to form capsules, then sustainability is improved, but encapsulation efficiency and imperviousness during storage deteriorate

Engineering Contradiction:

ImprovesustainabilityVSAvoidencapsulation efficiency

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent employs composite shell materials combining natural polysaccharides (pectin, chitosan, or alginate) with synthetic or semi-synthetic polymers (polyurea, polyamide, or epoxy resin). This composite approach allows the natural component to provide sustainability and biodegradability while the synthetic component ensures adequate mechanical strength and imperviousness for effective encapsulation and storage stability.

Inventive Principle:

Principle #40Composite materials

2Stability of the object's composition

If shell materials are made more impervious to ensure stability during storage, then leakage is reduced, but controlled release properties deteriorate

Engineering Contradiction:

Improvestorage stabilityVSAvoidcontrolled release

Core Design Contradiction:

Stability of the object's compositionVSDuration of action of moving object

Solution Approach 1:

The patent creates shells with non-uniform properties by combining different materials that have complementary characteristics. The polysaccharide component provides biodegradability and controlled permeability for release, while the polymer component provides structural integrity and resistance to leakage. This local differentiation of material properties within the shell structure enables simultaneous achievement of storage stability and controlled release.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent utilizes the ability of polysaccharides to change their permeability and degradation rate under different environmental conditions (pH, moisture, enzymatic activity). The shell composition is designed to remain stable under storage conditions but undergo controlled degradation or structural changes under application conditions, enabling transition from impermeable to permeable state as needed.

Inventive Principle:

Principle #35Parameter changes

3Manufacturing precision

If conventional synthetic shell materials are used, then encapsulation efficiency and stability are improved, but sustainability and environmental friendliness deteriorate

Engineering Contradiction:

Improveencapsulation efficiencyVSAvoidenvironmental impact

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The patent creates composite shells where natural polysaccharides replace a significant portion of conventional synthetic materials. The polysaccharide component (pectin, chitosan, or alginate) provides biodegradability and reduced environmental impact, while being combined with smaller amounts of synthetic polymer to maintain adequate encapsulation efficiency and shell integrity. This partial replacement strategy achieves sustainability goals while preserving functional performance.

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

This approach results in encapsulated compositions that are more sustainable, operationally safe, and cost-efficient, with improved stability and controlled release properties, comparable to conventional aminoplast-based microcapsules.

Implementation Method 1

The shell comprises a polymeric stabilizer that is formed by combination of a polymeric surfactant with at least one aminosilane

Methodology Applied

Scientific EffectChemical bonding: Chemical Bonding

Implementation Method 2

the shell is impervious or partially impervious to the benefit agent

Methodology Applied

Scientific EffectPhysical containment: Physical Containment

Data Source

PatentUS20220202665A1Core-shell encapsulate composition comprising a benefit agent

Publication Date: 2022.06.30 GIVAUDAN SA

AI summary

Described is an encapsulated composition comprising at least one core-shell microcapsule. The at least one core-shell microcapsule comprises a core comprising at least one benefit agent and a shell surrounding the core. The shell comprises a polymeric stabilizer that is formed by combination of a polymeric surfactant with at least one aminosilane. Disclosed are also a method of preparing an encapsulated composition and a use of such an encapsulated composition to enhance the performance of perfume and/or cosmetic ingredients in consumer goods.