Siloxane Lightening Agent for Hair Care and Color Stability

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Solution Overview

Problem

Existing hair lightening processes often fail to achieve high coloring performance while providing adequate hair care, leading to undesirable hair conditions such as reduced combability and color stability.

Innovation Solution

Incorporating specific dimethylcyclosiloxane and polydimethylsiloxane into a lightening agent, which is applied to keratin fibers, improving both the lightening performance and hair care by enhancing combability and maintaining color intensity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional lightening agents are used, then lightening performance is achieved, but hair care deteriorates (reduced combability)

Engineering Contradiction:

Improvelightening performanceVSAvoidcombability

Core Design Contradiction:

Manufacturing precisionVSEase of operation

Solution Approach 1:

The patent combines dimethylcyclosiloxane and polydimethylsiloxane with lightening agents to create a composite composition. The siloxanes form a protective complex with the lightening agent, allowing simultaneous achievement of lightening performance and hair care benefits, resolving the contradiction between effective lightening and maintaining combability.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The siloxane compounds act as intermediaries between the lightening agent and the hair fiber. They modulate the interaction by forming protective complexes that enable the lightening action while preventing direct damaging contact with the hair, thus maintaining combability during the lightening process.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Manufacturing precision

If conventional lightening agents are used, then lightening performance is achieved, but color stability deteriorates

Engineering Contradiction:

Improvelightening performanceVSAvoidcolor stability

Core Design Contradiction:

Manufacturing precisionVSStability of the object's composition

Solution Approach 1:

The composite composition of siloxanes and lightening agents creates a stable complex that not only achieves lightening but also enhances color stability. The siloxane matrix provides a protective environment that prevents premature oxidation and maintains color intensity over time, resolving the contradiction between lightening effectiveness and color stability.

Inventive Principle:

Principle #40Composite materials

3Manufacturing precision

If strong oxidizing agents are used to improve lightening, then lightening performance increases, but hair damage increases

Engineering Contradiction:

Improvelightening performanceVSAvoidhair damage

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The siloxane compounds serve as protective intermediaries that moderate the interaction between strong oxidizing agents and hair proteins. They form a protective complex that allows the oxidizing action to proceed for lightening while preventing excessive damage to the hair structure, thus maintaining combability and reducing harmful effects.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentEP3328352B1Lightening process with specific siloxane compound

Publication Date: 2019.12.18 HENKEL KGAA

AI summary

The invention relates to a lightening method for lightening keratin fibers, in particular human hair, wherein a lightener (AM) containing at least one special dimethyl cyclosiloxane and at least one special polydimethylsiloxane is used. The use of the special siloxanes results in the improved care of the keratin fibers while simultaneously improving the lightening performance. The invention further relates to a corresponding packaging unit (kit of parts) and to the use of a combination of special siloxanes for increasing the care of keratin fibers while simultaneously improving the lightening performance.