Block Copolymer Lip Composition for Wear and Comfort
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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 soft 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 wear 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 each segment to fulfill its specific function without compromising the other, resolving the contradiction between durability and comfort.
Solution Approach 2:
The glass transition temperatures (Tg) of the hard and soft segments are carefully controlled to be at least 50°C and at most 150°C, and at least -100°C and at most 50°C, respectively. By adjusting these thermal parameters, the composition achieves optimal balance between wear resistance (through hard segment rigidity) and application comfort (through soft segment flexibility at skin temperature).
2Illumination intensity
If high refractive index fluids are used to enhance shine or gloss, then the shine or gloss is enhanced, but the wear of gloss is limited
Solution Approach 1:
The composition uses a composite system combining block copolymers with high refractive index soft segments, tackifiers, and solvents. This composite structure provides both the optical properties (shine/gloss) needed for illumination enhancement and the mechanical properties (adhesion, flexibility) required for long-lasting wear resistance.
3Illumination intensity
If silicone fluids are used to improve shine/gloss, then the shine/gloss is improved, but the wear of shine leaves much to be desired
Solution Approach 1:
The invention changes the fundamental parameters of the polymer system by using block copolymers with controlled Tg values and specific hard/soft segment ratios, replacing conventional silicone fluids. This parameter change enables simultaneous achievement of shine/gloss and long-lasting wear that silicone fluids cannot provide alone.
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 controlling the physical and rheological properties of the block copolymer, enhancing wear and reducing tackiness.
Implementation Method 1
at least one solvent capable of solubilizing the at least one soft segment
Implementation Method 2
the at least one hard segment has a Tg value of 50° C. or more and 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 soft segment, and optionally, at least one colorant, and wherein the at least one hard segment has a Tg of about 50° C. or more and the at least one soft segment has a Tg value of about 20° C. or less.