Hemispherical PMMA Beads for Cosmetics Adhesion and Oil Absorption
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Solution Overview
Problem
Spherical polymethylmethacrylate beads used in cosmetics and other applications face challenges in manufacturing costs and shape control, limiting their adhesive properties and oil absorption, as well as providing cheerful colors in cosmetics.
Innovation Solution
The development of hemispherical polymethylmethacrylate beads with controlled size and high oil absorption, achieved through a method involving the addition of an acrylic monomer, crosslinking agent, initiator, and cosolvent to a solvent for polymerization, followed by washing and drying, allowing for enhanced adhesive properties and cheerful color application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If spherical polymethylmethacrylate beads are used, then manufacturing is simple, but adhesive property and oil absorption are insufficient
Solution Approach 1:
The patent applies asymmetry by changing the bead shape from spherical to hemispherical. This shape modification increases the surface area in contact with the substrate, thereby improving adhesive properties and oil absorption while maintaining ease of manufacture through a modified polymerization process
2Ease of manufacture
If spherical polymethylmethacrylate beads are used, then manufacturing is simple, but oil absorption is limited
Solution Approach 1:
The hemispherical shape provides greater surface area compared to spherical beads of the same volume, enabling increased oil absorption capacity while maintaining manufacturing simplicity through process modification
3Ease of manufacture
If spherical polymethylmethacrylate beads are ground for cosmetic application, then color can be achieved, but manufacturing cost increases and shape control becomes difficult
Solution Approach 1:
The patent applies preliminary action by forming the hemispherical shape during the polymerization process itself, rather than requiring subsequent grinding operations. This preliminary shaping achieves the desired form and color distribution while reducing manufacturing steps, costs, and improving shape control
4Reliability
If hemispherical shape is achieved, then adhesive property and oil absorption increase, but manufacturing process becomes more complex
Solution Approach 1:
The patent applies parameter changes by modifying the polymerization conditions, specifically using a cosolvent with a boiling point within -5 to 15°C of the reaction temperature. This parameter adjustment enables hemispherical shape formation and improved adhesive properties while maintaining manufacturing process simplicity
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 hemispherical beads exhibit increased adhesive properties and oil absorption, providing a cheerful color effect in cosmetics while enabling mass production with high productivity, surpassing the limitations of spherical beads.
Implementation Method 1
adding an acrylic monomer, a crosslinking agent, an initiator, and a cosolvent to a solvent to polymerize them
Implementation Method 2
wherein the difference between the boiling point (BP) of the cosolvent and the reaction temperature of the initiator is −5 to 15° C.
Data Source
AI summary
The present invention relates to a hemispherical polymethylmethacrylate bead, wherein the hemispherical polymethylmethacrylate bead of the invention has high adhesive property and oil absorption when applied to cosmetics, medical supply, household items, display devices, lighting fixtures, and miscellaneous goods and especially, it enables cheerful color when applied to cosmetics in comparison with spherical polymethylmethacrylate beads.