Amide Alcohol Cosmetic Base for Hair Dyeing Stability

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Solution Overview

Problem

Nitrogen-containing compounds used as cosmetic bases suffer from decomposition issues, particularly at room temperature, leading to odor and quality deterioration, and their use in cosmetic products is limited due to these problems.

Innovation Solution

Amide alcohols are used as a cosmetic base component, offering improved stability and reduced odor, suitable for both aqueous and oily cosmetic bases, and can be easily purified to provide a high-purity base.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional nitrogen-containing compounds (amino acid esters) are used as cosmetic base, then gelling and emulsifying properties are improved, but decomposition occurs during heating and aging leading to odor and quality deterioration

Engineering Contradiction:

Improvegelling and emulsifying propertiesVSAvoidstability during heating and aging

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent changes the chemical structure parameter from ester bonds to amide bonds in the molecular structure. This parameter change transforms the compound from being prone to hydrolysis (ester) to being resistant to hydrolysis (amide), thereby improving stability during heating and aging while maintaining gelling and emulsifying properties

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite molecular structure combining the amide group (for stability) with alcohol functionality (for cosmetic performance). This composite structure integrates the beneficial properties of both functional groups: the amide bond provides resistance to decomposition while the hydroxyl group enables gelling and emulsifying actions

Inventive Principle:

Principle #40Composite materials

2Reliability

If refrigeration is used to prevent decomposition of conventional nitrogen-containing compounds, then quality is improved, but storage complexity and cost increase

Engineering Contradiction:

Improvequality stabilityVSAvoidstorage requirements

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent changes the chemical stability parameter by replacing ester bonds with amide bonds, which have higher resistance to hydrolysis. This parameter change allows the compound to maintain quality stability at room temperature without requiring refrigeration, thereby simplifying storage conditions and reducing storage complexity

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If conventional nitrogen-containing compounds are used, then cosmetic functionality is achieved, but odor problems occur due to decomposition

Engineering Contradiction:

Improvecosmetic functionalityVSAvoidodor

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The patent changes the chemical bond parameter from ester to amide, which fundamentally alters the decomposition behavior. The amide bond is more stable and resists hydrolysis, preventing the formation of odorous decomposition products while maintaining the cosmetic functionality of gelling and emulsifying

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP4201394B1Cosmetic base for hair dyeing comprising a dye and including amide alcohol

Publication Date: 2025.08.06 KOKYU ALCOHOL KOGYO CO LTD

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Figure 3

AI summary

The purpose of the present invention is to provide a novel amide alcohol that can be used as a cosmetic base ingredient. An amide alcohol represented by formula (I).