Macroporous PMMA Particles for Cosmetic Oil Absorption
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Solution Overview
Problem
Conventional methods for preparing porous polymethyl methacrylate (PMMA) result in materials with high internal density and limited oil absorption due to nano-sized pores, and often leave residual solvents and impurities, making them unsuitable for cosmetic applications.
Innovation Solution
A method involving the dissolution of polymethyl methacrylate and Pluronic polymer in an organic solvent, followed by emulsion polymerization with a surfactant, and subsequent evaporation and washing to create macroporous PMMA particles with larger pores, enhancing oil absorption and reducing solvent content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional methods are used to prepare porous PMMA, then porous structure is formed, but oil absorption remains limited due to highly dense internal structure and nano-sized pores
Solution Approach 1:
The patent applies porous materials by creating macroporous PMMA particles with controlled pore sizes (0.03-10 μm) through the incorporation of porogen agents during polymerization. The porous structure is formed by the decomposition of porogen agents, creating interconnected macropores that significantly increase oil absorption capacity compared to conventional nano-sized pores.
Solution Approach 2:
The patent changes the pore size parameter from nano-scale to macro-scale (0.03-10 μm) by controlling the type and amount of porogen agents used. This parameter change fundamentally alters the internal structure from highly dense to macroporous, enabling significantly improved oil absorption while maintaining particle integrity.
2Shape
If organic solvents are used as cosolvents in conventional methods, then porous structure is formed, but multiple washing steps are required to remove residual solvent
Solution Approach 1:
The patent uses water-soluble porogen agents that can be easily removed through simple washing steps, avoiding the need for complex multi-step washing processes required for organic solvents. The porogen agents serve their purpose during polymerization and then can be readily removed, simplifying the overall process.
Solution Approach 2:
The patent employs water-soluble porogen agents as intermediaries that facilitate pore formation during polymerization and can be easily removed afterward. These intermediaries act as temporary structures that create the desired porous architecture and then can be washed away without leaving harmful residues, eliminating the need for extensive solvent removal procedures.
3Shape
If monomers and initiators are used in conventional methods, then porous particles are formed, but residue has negative effect on safety for cosmetic applications
Solution Approach 1:
The patent changes the chemical composition parameters by using pre-polymerized PMMA particles instead of monomers, and by selecting water-soluble porogen agents that decompose into harmless substances. This parameter change eliminates harmful residues while maintaining the desired porous particle structure, making the product safe for cosmetic applications.
Solution Approach 2:
The patent employs water-soluble porogen agents that serve their function during polymerization and then can be easily removed through washing, leaving no harmful residues. These temporary agents create the necessary porous structure and then disappear through simple water washing, ensuring safety for cosmetic use without requiring complex purification processes.
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 method produces PMMA particles with significantly higher oil absorption and lower residual solvent content, providing effective sebum control and improved skin safety for cosmetic use.
Implementation Method 1
dissolving a polymethyl methacrylate polymer and Pluronic polymer into an organic solvent
Implementation Method 2
introducing the mixed solution of step (a) to an aqueous solution containing a surfactant to carry out emulsion polymerization
Implementation Method 3
heating the resultant product of step (b) to allow evaporation of the organic solvent
Data Source
AI summary
A method for preparing macroporous polymethyl methacrylate (PMMA) particles includes the steps of: (a) dissolving a polymethyl methacrylate polymer and Pluronic polymer into an organic solvent; (b) introducing the mixed solution of step (a) to an aqueous solution containing a surfactant to carry out emulsion polymerization; (c) heating the resultant product of step (b) to allow evaporation of the organic solvent; and (d) washing and drying the porous polymethyl methacrylate particles remaining after the evaporation.