Block Copolymer Lip Compositions with Solubilized Hard Segments
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Solution Overview
Problem
Commercially available lip treatment compositions often have limited wear and are uncomfortable due to high molecular weight polymers and tackiness, failing to provide long-lasting shine or gloss.
Innovation Solution
A cosmetic composition comprising a block copolymer with a hard segment having a Tg of 50° C. or more and a soft segment with a Tg of 20° C. or less, combined with a tackifier and a solvent capable of solubilizing the hard segment, to create a comfortable and long-lasting shine or gloss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If high molecular weight polymers with high viscosity are used to maintain wear of shine/gloss, then the longevity of shine is improved, but the composition becomes tacky and uncomfortable to apply
Solution Approach 1:
The polymer is segmented into block copolymer structures with distinct hard segments (providing structural integrity and wear resistance) and soft segments (providing comfort and ease of application). This segmentation allows the material to simultaneously achieve long-lasting shine and comfortable application by distributing different functions to different molecular segments.
Solution Approach 2:
The glass transition temperatures (Tg) of the hard and soft segments are specifically controlled to be above and below a certain range respectively. This parameter change enables the material to exhibit appropriate hardness and softness at different temperatures, achieving both wear resistance and application comfort.
2Illumination intensity
If high refractive index fluids are used to enhance shine or gloss, then the shine enhancement is improved, but the wear of gloss is limited
Solution Approach 1:
The invention creates a composite system combining block copolymers with high refractive index fluids. The block copolymer matrix provides structural support and wear resistance, while the high refractive index fluids dispersed within provide enhanced shine. This composite structure allows both shine enhancement and improved wear characteristics compared to using high refractive index fluids alone.
3Illumination intensity
If silicone fluids are used to improve shine/gloss, then the shine is enhanced, but the wear of shine leaves much to be desired
Solution Approach 1:
The invention changes the physical and chemical parameters of the fluid system by using block copolymers with controlled Tg values instead of conventional silicone fluids. This parameter change results in a material that maintains shine enhancement while significantly improving wear duration through the temperature-dependent phase behavior of the block copolymer segments.
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 delivers a comfortable, long-lasting shine or gloss on the lips by optimizing the physical and rheological properties of block copolymers, enhancing wear and reducing tackiness.
Implementation Method 1
at least one solvent capable of solubilizing the at least one hard segment
Implementation Method 2
the at least one hard segment has a Tg value of 50° C. or more, the at least one soft segment has a Tg value of 20° C. or less
Data Source
AI summary
A cosmetic composition containing at least one block copolymer having at least one hard segment and at least one soft segment, at least one tackifier component, at least one solvent capable of solubilizing the at least one hard segment, and optionally, at least one colorant, and wherein the at least one hard segment has a Tg value of about 50° C. or more and the at least one soft segment has a Tg value of about 20° C. or less.