Cosmetic Powder Composition Balancing Silky Feel and Skin Coverage

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Solution Overview

Problem

Existing cosmetic powders, particularly those containing N-mono long-chain acyl basic amino acids, fail to provide a comfortable silky feeling, natural translucency, good luminous finish, uniform skin surface, and adequate adhesiveness and covering power.

Innovation Solution

A composition for cosmetics is formulated by mixing N-mono long-chain and N-mono middle-chain acyl basic amino acids with inorganic powders, optimizing their ratio and combining them with a surface treatment to enhance skin compatibility and coverage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If N-mono long-chain acyl basic amino acid is used as cosmetic powder, then spreadability on skin is improved, but oil repellency deteriorates and silky feeling decreases

Engineering Contradiction:

ImprovespreadabilityVSAvoidsilky feeling

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent combines N-mono long-chain acyl basic amino acid with N-mono middle-chain acyl basic amino acid to create a composite cosmetic powder. The long-chain component (12-22 carbon atoms) provides spreadability, while the middle-chain component (6-10 carbon atoms) contributes oil repellency and silky feeling, resolving the contradiction between these properties

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent optimizes the carbon chain length parameter of the acyl groups by using both long-chain (12-22) and middle-chain (6-10) variants. This parameter variation allows balancing the contradictory properties of spreadability and silky feeling/oil repellency through compositional adjustment

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If N-mono long-chain acyl basic amino acid is used, then spreadability is improved, but adhesiveness and covering power deteriorate

Engineering Contradiction:

ImprovespreadabilityVSAvoidadhesiveness

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The composite of long-chain and middle-chain acyl basic amino acids creates synergistic effects where the middle-chain component enhances adhesiveness and covering power while the long-chain component maintains spreadability, resolving the contradiction between application ease and functional performance

Inventive Principle:

Principle #40Composite materials

3Reliability

If phosphoric acid ester ate with perfluoroalkyl group is used for surface treatment, then silky feeling is improved, but environmental compatibility deteriorates

Engineering Contradiction:

Improvesilky feelingVSAvoidenvironmental compatibility

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent removes the harmful perfluoroalkyl group from the surface treatment agent while retaining the beneficial silky feeling effect through alternative non-halogenated compounds, thereby eliminating environmental harm while preserving the desired sensory property

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the environmentally harmful phosphoric acid ester ate with perfluoroalkyl group with alternative surface treatment agents that provide similar or improved silky feeling without the environmental drawbacks, effectively converting a harmful approach into a beneficial one

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

4Manufacturing precision

If N-mono middle-chain acyl basic amino acid is used in combination with inorganic powder and oil agent, then powder-transfer property is improved, but friction control becomes difficult and uniform feeling deteriorates

Engineering Contradiction:

Improvepowder-transfer propertyVSAvoiduniform feeling

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The patent optimizes the carbon chain length parameter by using middle-chain (6-10) acyl groups, which provide adequate powder-transfer property while maintaining appropriate friction characteristics for uniform skin coverage, avoiding the excessive slipperiness of longer chains

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The combination of N-mono middle-chain acyl basic amino acid with N-mono long-chain acyl basic amino acid creates a balanced composite that provides good powder-transfer property while the long-chain component ensures sufficient friction for uniform application and skin feeling

Inventive Principle:

Principle #40Composite materials

Data Source

PatentEP3449899B1Composition for cosmetics and cosmetics comprising same

Publication Date: 2026.03.25 AJINOMOTO CO INC

AI summary

The present invention relates to a composition for cosmetics containing (A) one or more kinds of N-mono long-chain acyl basic amino acids, and (B) one or more kinds of N-mono middle-chain acyl basic amino acids, and the composition for cosmetics further containing (C) an inorganic powder, and provides a composition for cosmetics that gives, when applying, a comfortable silky feeling and, to the skin after application, natural translucency, good luminous finish and a uniform feeling of the skin surface, and has adhesiveness to the skin and high covering power.