Eye Makeup Composition with Low Tg Polymer for Adhesive Stability
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Solution Overview
Problem
Conventional eye-makeup cosmetic compositions and adhesives for fake eyelashes often cause discomfort due to irritation, exhibit poor or excessive adhesiveness, and are unstable over time, leading to difficulties in maintaining long-term makeup effects and easy removal.
Innovation Solution
A colored cosmetic composition comprising a polymer with a glass transition temperature of −30° C or less, a hydrophilic thickener, and water, which provides appropriate adhesiveness and stability for eyelids and fake eyelashes, allowing for long-lasting makeup effects while being easily removable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional adhesives are used for fake eyelashes, then adhesiveness is provided, but irritation and discomfort occur on the eyelids
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive by incorporating specific polymers (acrylates copolymer, acrylates/ethylhexyl acrylate copolymer, styrene/acrylates copolymer) with controlled molecular weights and glass transition temperatures between -50°C and -100°C. These parameter changes enable the adhesive to provide strong bonding while maintaining flexibility and biocompatibility, thereby reducing irritation on the sensitive eyelid skin while preserving effective adhesiveness for securing fake eyelashes.
2Shape
If conventional eye-makeup cosmetic compositions are used, then makeup effect is achieved, but poor or excessive adhesiveness occurs
Solution Approach 1:
The patent employs a composite material system combining multiple polymer types (acrylates copolymer, acrylates/ethylhexyl acrylate copolymer, and styrene/acrylates copolymer) with complementary properties. This composite formulation creates a balanced adhesive system that provides optimal holding strength for makeup while maintaining flexibility for natural movement, avoiding both poor adhesion and excessive stiffness that would compromise makeup quality.
Solution Approach 2:
The patent optimizes the glass transition temperature range (-50°C to -100°C) and molecular weight parameters of the polymer components to achieve the desired balance between adhesiveness and makeup quality. This parameter control ensures the adhesive remains flexible at body temperature while providing sufficient bonding strength, resolving the contradiction between achieving good makeup effect and maintaining appropriate adhesiveness.
3Duration of action of stationary object
If conventional adhesives are used for long term fixation, then adhesiveness is enhanced, but difficulty in removal occurs
Solution Approach 1:
The patent creates a dynamic adhesive system where the polymer network maintains strong bonding under normal conditions but becomes responsive to environmental changes during removal. The low glass transition temperature polymers allow the adhesive to soften and become more flexible when exposed to heat and moisture during cleansing, enabling easy removal after long-term wear without compromising initial bonding strength or requiring excessive force that could damage the skin.
4Shape
If conventional cosmetic compositions are used, then initial makeup effect is achieved, but phase separation occurs over time
Solution Approach 1:
The patent uses a composite polymer system with carefully selected components that are mutually compatible and form a stable network structure. The combination of acrylates copolymer, acrylates/ethylhexyl acrylate copolymer, and styrene/acrylates copolymer creates a homogeneous matrix that resists phase separation over time. This composite approach ensures long-term stability of the makeup composition while maintaining the desired aesthetic effects and adhesive properties throughout the product shelf life and wear duration.
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 offers a comfortable user experience with sustained adhesiveness for fake eyelashes on the eyelids, maintaining long-term eye makeup effects and ensuring easy removal without irritation, while maintaining stability over time.
Implementation Method 1
a polymer which has a Tg (glass transition temperature) of −30° C. or less
Data Source
AI summary
The present invention relates to a colored cosmetic composition for making up eyes, in particular eyelids. One of the aspects of the present invention is a colored cosmetic composition for making up eyes, in particular to eyelids, comprising: (i) at least one polymer which has a Tg of −30° C. or less; (ii) at least one hydrophilic thickener; (iii) at least one pigment; and (iv) water. The cosmetic composition according to the present invention can provide a good feeling during use and appropriate adhesiveness to fake eyelashes, and is stable over time.