Cosmetic Composition with Phase-Separated Films for Wash-Durable Color

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing cosmetic compositions fail to maintain a good feeling and film durability on keratin substances like hair and skin, especially in the presence of oily components such as sebum, leading to rapid loss of effects like gloss and color after washing.

Innovation Solution

A cosmetic composition comprising a film-forming polymer with an M unit and Q unit, a high-molecular-weight organopolysiloxane, and an organopolysiloxane with a polyalkylene oxide moiety and cationic group, which forms a phase-separated hydrophobic film that resists plasticization by oily components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Duration of action of moving object

If a silicone-based film-forming polymer is used to form a hydrophobic film, then gloss and smooth feeling are imparted to hair, but the effects are lost by one time of shampooing or physical force

Engineering Contradiction:

Improveduration of gloss and smooth feelingVSAvoidwashing durability

Core Design Contradiction:

Duration of action of moving objectVSReliability

Solution Approach 1:

The patent uses a composite film-forming system combining a silicone-based polymer (component A) with a polyalkylene oxide-modified polymer (component B). This composite approach creates a more durable hydrophobic film that resists washing and physical forces better than silicone alone, while maintaining gloss and smoothness.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies the silicone polymer by incorporating polyalkylene oxide groups, changing its chemical structure and properties. This parameter change enables the polymer to form stronger adhesion to hair and better resistance to washing, improving both duration and reliability of the effect.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If a cosmetic composition is applied to hair with sebum, then the composition should maintain performance, but sebum causes plasticization and reduces film durability

Engineering Contradiction:

Improvefilm durability in presence of sebumVSAvoidplasticization by sebum

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful plasticization effect of sebum into a beneficial phase-separated structure. The polyalkylene oxide groups in component B have affinity for sebum, allowing the composition to accept sebum incorporation while maintaining film integrity through phase separation, thus converting the harmful plasticization into a stable microstructure.

Inventive Principle:

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

Solution Approach 2:

The patent creates local phase-separated regions within the film where polyalkylene oxide-rich domains interact with sebum while silicone-rich domains maintain the hydrophobic barrier. This local quality differentiation allows the film to simultaneously resist plasticization and accommodate sebum presence.

Inventive Principle:

Principle #3Local quality

3Duration of action of moving object

If a temporary hair dye forms a film on hair surface, then coloring is achieved with little damage, but the color is likely to be lost by shampooing

Engineering Contradiction:

Improveduration of colorVSAvoidcolor loss by shampooing

Core Design Contradiction:

Duration of action of moving objectVSObject-affected harmful factors

Solution Approach 1:

The patent combines silicone-based film-forming polymer with polyalkylene oxide-modified polymer to create a composite dye film. This composite structure provides both the initial coloring effect and enhanced washing durability, preventing color loss while maintaining the temporary nature of the dye.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies the film-forming polymer parameters by incorporating polyalkylene oxide groups, which change the film's adhesion and resistance properties. This enables the temporary dye film to withstand shampooing better while still being removable, extending color duration without permanent damage.

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

The composition imparts a good feeling and forms a film with excellent washing durability, maintaining effects even in the presence of sebum, enhancing sustainability of gloss and color.

Implementation Method 1

forms a phase-separated hydrophobic film

Methodology Applied

Scientific EffectPhase separation:

Implementation Method 2

forms a phase-separated hydrophobic film that resists plasticization by oily components

Methodology Applied

Scientific EffectHydrophobic effect: Hydrophobe

Implementation Method 3

an organopolysiloxane having a polyalkylene oxide moiety and a cationic group

Methodology Applied

Scientific EffectAdsorption: Adsorption

Data Source

PatentEP4595946A1Cosmetic composition

Publication Date: 2025.08.06 KAO CORP

AI summary

A cosmetic composition containing components (A) to (D) described below: (A) a film-forming polymer including an M unit represented by (R1)3SiO1/2 (in which R1 represents a hydrocarbon group having 1 or more and 12 or less carbons and being optionally substituted with fluorine, or a hydroxy group, and a plurality of R1 may be the same or different), and a Q unit represented by SiO4/2; (B) a film-forming polymer other than the component (A); (C) a high-molecular-weight organopolysiloxane; and (D) an organopolysiloxane other than the components (A) to (C), the organopolysiloxane having a polyalkylene oxide moiety and a cationic group.