Formaldehyde-Free Microcapsule Blends for Stable Active Release
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Cosmetic, cleaning, and textile treatment products containing microcapsules often face issues with formaldehyde residues from melamine-formaldehyde microcapsules, which are undesirable and difficult to completely eliminate, even with the use of formaldehyde scavengers, leading to stability and color issues during storage and usage.
Innovation Solution
Development of formaldehyde-free microcapsules with capsule walls made from resins reacted with aromatic alcohols and aldehydic components, specifically using resorcinol and phloroglucinol with (meth)acrylate polymers, which are stable and provide a synergistic effect in terms of boost effect, storage stability, and color fastness when combined in specific ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If formaldehyde scavengers are added to reduce formaldehyde content, then formaldehyde content is reduced, but the formaldehyde content cannot be reduced below a certain limit even with large amounts of scavengers
Solution Approach 1:
The patent extracts and eliminates the source of formaldehyde by replacing melamine-formaldehyde microcapsules with alternative microcapsule materials that do not contain formaldehyde, thereby removing the harmful substance at its source rather than attempting to remove it after formation
Solution Approach 2:
The patent changes the chemical composition parameters of the microcapsule material from formaldehyde-based (melamine-formaldehyde) to alternative polymers, fundamentally altering the system to eliminate formaldehyde generation
2Stability of the object's composition
If melamine-formaldehyde microcapsules are used for stability, then storage stability is improved, but formaldehyde residues remain which cause color changes and stability issues
Solution Approach 1:
The patent converts the harmful formaldehyde byproduct into a benefit by selecting alternative microcapsule materials that provide equal or superior stability without generating harmful residues, effectively using the stability requirement to drive material selection toward better options
Solution Approach 2:
The patent employs composite microcapsule structures with walls made from alternative polymers that combine the desired stability properties without the harmful formaldehyde content, replacing the单一的 melamine-formaldehyde composition
3Object-generated harmful factors
If formaldehyde-free microcapsules are used to avoid formaldehyde residues, then color fastness is improved, but some formulations show weak sedimentation or boost effect after long-term storage
Solution Approach 1:
The patent optimizes parameters such as polymer molecular weight, crosslinking density, and capsule wall thickness to achieve the right balance between color fastness and mechanical stability, preventing sedimentation while maintaining the formaldehyde-free advantage
Solution Approach 2:
The patent uses composite polymer systems in the microcapsule walls that combine the color stability benefits of formaldehyde-free materials with structural components that prevent sedimentation and maintain boost effect
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 formaldehyde-free microcapsules ensure low formaldehyde content, stable storage, and effective release of active ingredients, such as fragrances and plant extracts, with a strong boost effect and minimal color change or sedimentation, enhancing the performance and longevity of the products.
Implementation Method 1
the capsule walls of which each comprise a resin, which is obtained by reacting a) at least one aromatic alcohol or its ethers or derivatives with b) at least one aldehydic component
Implementation Method 2
the active substance is then released by mechanical force. The active substance is preferably released by friction
Data Source
AI summary
The application relates to cosmetic agents, cleaning agents, and fabric treatment agents containing a combination of at least two different microcapsules as well as to methods for releasing active substances from said microcapsules when using said agents.