Functionalized Dye Linker Segments Color Fastness and Vibrancy

Solution Overview

Problem

Oxidative hair dyes, while providing long-lasting color, often suffer from side reactions during application and perform poorly on damaged hair, lacking the vibrancy and color purity of direct dyes.

Innovation Solution

Development of functionalized non-oxidative dyes with a chromophore bound to a color fastness moiety via a linker, enhancing color fastness and vibrancy, and suitable for use in dye compositions for keratin fibers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Duration of action of stationary object

If oxidative dyes are used to provide long-lasting coloration, then color fastness is improved, but color vibrancy and purity deteriorate

Engineering Contradiction:

Improvecolor fastnessVSAvoidcolor vibrancy

Core Design Contradiction:

Duration of action of stationary objectVSIllumination intensity

Solution Approach 1:

The dye molecule is segmented into distinct functional components: a chromophore unit for color vibrancy and a color fastness moiety for long-lasting coloration. These segments are connected via a linker, allowing each component to independently contribute its specialized function without interfering with the other.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention creates a composite dye molecule by combining the chromophore (responsible for color quality) with the color fastness moiety (responsible for durability). This molecular-level composite structure enables the dye to simultaneously achieve both vibrant color and long-lasting fastness that neither component could achieve alone.

Inventive Principle:

Principle #40Composite materials

2Duration of action of stationary object

If oxidative dyes are used for permanent coloring, then color retention is improved, but side reactions during application increase

Engineering Contradiction:

Improvecolor retentionVSAvoidside reactions

Core Design Contradiction:

Duration of action of stationary objectVSObject-generated harmful factors

Solution Approach 1:

The invention extracts and eliminates the oxidizing agent component from the dye system. By using a non-oxidative direct dye that has been functionally modified, the patent removes the source of side reactions while retaining the color retention capability through the attached color fastness moiety.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention converts the traditional approach by eliminating the harmful oxidative process while achieving equivalent or superior color retention. The color fastness moiety provides durability without requiring the harmful oxidation step, effectively turning the problem of side reactions into a benefit of a cleaner, safer application process.

Inventive Principle:

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

3Illumination intensity

If direct dyes are used for vibrant color, then color purity is improved, but color fastness deteriorates

Engineering Contradiction:

Improvecolor purityVSAvoidcolor fastness

Core Design Contradiction:

Illumination intensityVSDuration of action of stationary object

Solution Approach 1:

The dye molecule is segmented into distinct functional components: a chromophore unit for color vibrancy and a color fastness moiety for long-lasting coloration. These segments are connected via a linker, allowing each component to independently contribute its specialized function without interfering with the other.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention creates a composite dye molecule by combining the chromophore (responsible for color quality) with the color fastness moiety (responsible for durability). This molecular-level composite structure enables the dye to simultaneously achieve both vibrant color and long-lasting fastness that neither component could achieve alone.

Inventive Principle:

Principle #40Composite materials

Data Source

PatentEP2516555B1Coloring agents and methods of use thereof

Publication Date: 2018.08.22 LIVING PROOF INC

Figure 1a~1b
Figure 2a~2b

AI summary

Dyes, compositions comprising dyes and methods for using the same are provided.