Water-Soluble Dye Polymer for Skin Tone Enhancement
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Solution Overview
Problem
Cosmetic compositions that provide skin care benefits while enhancing natural skin tone without the drawbacks of pigments and small molecule dyes, such as poor tactile sensory properties and short-lived effects, are needed.
Innovation Solution
A skin care composition containing a water-soluble dye polymer with a negatively charged reactive dye substituent covalently bound to a polymer backbone, which is present in low concentrations to enhance natural skin tone and provide durable coloration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pigment particles are used to enhance skin tone, then color benefits are provided, but poor tactile sensory properties occur
Solution Approach 1:
The patent extracts the colorant function from solid pigment particles and transfers it to water-soluble dye molecules that are covalently bound to a polymer backbone. This extraction eliminates the particulate matter causing poor tactile sensory properties while retaining the color enhancement benefit through molecular-level dye distribution.
Solution Approach 2:
The patent changes the physical state of colorants from particulate (pigment) to molecular (water-soluble dye), and changes the binding state from physical mixture to covalent bonding. This parameter change resolves the contradiction by providing color benefits through molecular dyes while eliminating the tactile discomfort associated with pigment particles.
2Ease of manufacture
If small molecule dyes are used to enhance skin tone, then color benefits are provided, but skin permeability and toxicity risks occur
Solution Approach 1:
The patent creates a composite structure where water-soluble dye molecules are covalently bound to a polymer backbone. This composite material combines the colorant function of small molecule dyes with the safety and non-permeability characteristics of polymers, eliminating toxicity risks while maintaining color benefits.
Solution Approach 2:
The polymer backbone acts as an intermediary carrier that holds the water-soluble dye molecules. This intermediary structure prevents the dye from permeating into the skin while still allowing it to provide color benefits on the skin surface, thus resolving the contradiction between color efficacy and safety.
3Ease of manufacture
If low quantities of pigments or dyes are used to avoid unnatural skin tone, then natural appearance is maintained, but the color effects are easily washed off and short-lived
Solution Approach 1:
The patent uses a composite material where dye molecules are covalently bound to a polymer backbone, creating a macromolecular structure. This composite provides durable color effects because the covalent bonding prevents the dye from being easily washed off, while the low concentration requirement is maintained to ensure natural skin tone enhancement.
Solution Approach 2:
The patent employs a macromolecular polymer structure that provides a large molecular size and complex three-dimensional structure. This structural complexity prevents the colorant from penetrating skin pores and being easily removed, thereby extending the duration of color effects while maintaining natural appearance at low concentrations.
4Duration of action of moving object
If water-soluble dye polymers with covalent bonding are used, then durable coloration is achieved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the colorant system into two functional components: water-soluble dye molecules for color provision and polymer backbone for durability and safety. The covalent bonding between these segments creates a modular structure that achieves durable coloration while allowing for simplified manufacturing through separate component preparation and combination.
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 effectively enhances natural skin tone, particularly pinkish appearance, and maintains its effects even after washing, offering a durable cosmetic benefit without the drawbacks of traditional pigments and dyes.
Implementation Method 1
polymer backbone having negatively charged reactive dye substituent covalently bound thereto
Data Source
AI summary
A skin care composition is described comprising water-soluble dye polymer comprising polymer backbone having negatively charged reactive dye substituent covalently bound thereto; and cosmetically acceptable carrier. The dye polymer is present in amount of 0.00001 to 0.1% in terms of reactive dye substituent by weight of the skin care composition. The composition is useful for providing cosmetic benefits such as skin lightening, evening skin tone and masking blemishes.