Resin Beads with Fixed Silicone for Water Repellency
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Solution Overview
Problem
Conventional methods for imparting water and oil repellency to resin beads, such as hydrophobization treatments and silicone-acrylic-based graft copolymers, face issues with uniformity, adhesion, and durability, leading to insufficient modification and potential peeling off, especially when used in cosmetic materials.
Innovation Solution
Resin beads are produced through suspension polymerization with a monomer mixture containing copolymerizable functional groups and non-polymerizable silicone, such as silicone-acrylic copolymers or polyether-modified silicones, ensuring the silicone is fixed within the particles, providing stable water and oil repellency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrophobization treatment is applied to resin powder surface using conventional methods (heat treatment with oil agent or baking methyl hydrogen polysiloxane), then water repellency is improved, but the surface treatment becomes ununiform and resin deterioration occurs due to heat
Solution Approach 1:
The invention changes the fundamental approach from surface coating to bulk incorporation. By adding silicone compound during the polymerization stage and incorporating it into the resin bead structure, the treatment achieves uniform distribution throughout the material rather than on the surface only, eliminating the uniformity issues of conventional surface treatments while avoiding heat-related deterioration
Solution Approach 2:
The silicone compound is incorporated into the resin beads during the polymerization process itself, before the beads are formed and dried. This preliminary incorporation ensures uniform distribution of the water-repellent agent throughout the resin structure, preventing the ununiform surface treatment problems that occur with post-forming surface applications
2Reliability
If silicone-acrylic-based graft copolymer is used to coat powder surface, then adhesion and water repellency are improved, but the coating resin peels off depending on dispersion medium and adsorption is insufficient
Solution Approach 1:
The invention extracts the silicone compound from the context of surface coating and instead incorporates it directly into the resin bead structure during polymerization. This eliminates the coating layer entirely and integrates the water-repellent functionality into the bulk material, preventing peeling issues while maintaining adhesion
Solution Approach 2:
The invention creates a composite resin bead structure where the silicone compound is integrated within the polymer matrix. This composite approach combines the adhesive properties of the resin with the water-repellent properties of the silicone compound in a unified structure, eliminating the interface between coating and substrate that causes peeling
3Reliability
If copolymer with polymerizable silicone macromonomer is used, then water repellency and skin adhesion are improved, but the copolymer cannot be adsorbed sufficiently on spherical resin beads surface due to high specific surface area of other powders
Solution Approach 1:
The silicone compound is incorporated into the resin beads during the polymerization process itself, before the beads are formed and dried. This preliminary incorporation ensures uniform distribution of the water-repellent agent throughout the resin structure, preventing the ununiform surface treatment problems that occur with post-forming surface applications
Solution Approach 2:
The invention extracts the silicone compound from the context of surface coating and instead incorporates it directly into the resin bead structure during polymerization. This eliminates the coating layer entirely and integrates the water-repellent functionality into the bulk material, preventing peeling issues while maintaining adhesion
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 resin beads achieve persistent and uniform water and oil repellency, enhancing the stability and longevity of cosmetic products by preventing makeup deterioration due to water or sweat, while maintaining excellent skin adhesion and extensibility.
Implementation Method 1
the non-polymerizable silicone being a functional material capable of imparting water repellency and oil repellency
Data Source
AI summary
The present invention provides resin beads that are capable of realizing a water repellent and oil repellent effect, and further, that are also capable of providing cosmetic materials excellent in persistence of makeup when added and used in cosmetic materials etc. because the resin beads themselves contain silicone in a fixed state, and the present invention also provides a process for producing the resin beads. Resin beads being resin particles (a copolymer) obtained by subjecting a monomer mixture containing a plurality of monomers each having a copolymerizable functional group to suspension polymerization in a state where at least a non-polymerizable silicone is present, the resin particles containing the silicon in a fixed state, and a process for producing the resin beads.