| POLYMERS Vol.69 No.12 |
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COVER STORY
Polymers for Beauty |
| COVER STORY: Highlight Reviews |
| Utilization of Surface-Treated Powder in Cosmetics: Focusing on Polymers | Hiroshi FUKUI |
| <Abstract> Various powders are used in cosmetics to protect from sweat and sebum, deodorize body odor, color the skin, and protect the skin from ultraviolet rays. Those powders include polymer powders, extender pigments, coloring pigments, white pigments, and pearl pigments. Further, polymers are dissolved in water or oil and used in cosmetics as thickeners, film agents, moisturizers, and emulsifiers. By treating the surface of the inorganic powder with these polymers, the original function of the powder is improved. Also, if necessary, it is dispersed in the emulsified water phase or oil phase as desired to improve the feeling of use and to give a long lasting effect. This report introduces powders and polymers used in cosmetics. In addition, the surface treatment of cosmetic powders with silicone, fluoropolymers and bio-related polymers will be introduced. Keywords: Cosmetics / Polymer / Surface Treatment / Powder / Pigments / Silicone |
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| Evaluation of Skin Comfortable Feeling and Moisturizing Capacity by Physical Measurements | Ai YAMASHITA, Masato TAKAHASHI |
| <Abstract> Skin comfortable feeling and moisturizing capacity are important properties to evaluate the function of cosmetics. In order to develop an excellent basic understanding of cosmetics, we measured rheological properties of various aqueous solutions containing hyaluronic acid, chitosan and glycerin with various concentrations. Further, the moisturizing capacity of these solutions on horny cell layers are measured by using a moisture checker. The obtained values are compared with the results of sensorial evaluation carried out on 10 female students. Keywords: Basic Understanding of Cosmetics / Skin Comfortable Feeling / Moisturizing Capacity / Sensorial Evaluation / Rheological Properties / Hyaluronic Acid / Chitosan / Glycerin |
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| Nanofibers Using of SARS-CoV-2 Defense Masks and Moisturizing Cosmetics | Yoshihiro YAMASHITA |
| <Abstract> To overcome the corona disaster caused by SARS-CoV-2, surgical masks with nanofiber filters to reduce viral infections and masks made of high-polymer material to reduce the space between the mask and the face as much as possible have been developed. Electrospinning nanofibers add moisture to the skin, and sales of cosmetics and spinning beauty products have begun. Cellulose nanofibers contribute to control the viscosity and fluidity of cosmetic solutions. Keywords: Nanofibers / Electrospinning / Surgical Masks / Mask Leakage Rate / PVDF / Cellulose Nanofiber |
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| COVER STORY: Topics and Products |
| Development of Novel Oil-Soluble Polyurethane Gel and its Application to Cosmetics | Takashi TAKESHITA |
| <Abstract> People all over the world are increasingly aiming to present an ageless impression that reflects their success in work, private, and social networking activities. One of the most important features that determines the age impression of a person is their laugh lines. As a result, various ways to improve the appearance of laugh lines has been the focus of cosmetic product developments. However, the long-lasting effect of these conventional makeup products is generally not satisfying in the face areas of the laugh lines. In this study, we have addressed the challenge of aggregation collapse by developing a novel powder coating technology that can absorb movements and maintain a uniform coating film. As a surface treatment agent, we focused on a polyurethane gel, which exhibits high elasticity due to hard and soft segments that coexist in the structure. Results show that our polyurethane-treated foundation not only suppresses the makeup collapse of laugh lines when movement is occurring, but it can also maintain a beautiful age impression. Keywords: Cosmetics / Polyurethane / Surface Treated Powder / Elasticity / Laugh Line |
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| The Application of Rheology in the Development of Cosmetics | Yasuharu NAKAGAWA |
| <Abstract> Establishing manufacturing processes, skin effects, texture and preventing problems with stability are all integral in the development and manufacture of cosmetics. The aim of this study was to evaluate the usefulness of rheological measurements in these areas of cosmetic production. Rheological measurements were applied at various stages during the development and manufacture of a bath milk, a skin care product and a cleansing milk. In the case of the bath milk, we applied mainly flow curves to observe the dispersibility of emulsified particles and to predict its stability. Regarding the skin care product, we investigated the rheological properties of materials on its basic formula to understand their effects on its texture. As for the cleansing milk, we used rheological measurements in order to distinguish the physical properties of formulas with defective textures from those that were acceptable. We then compared the rheological properties of an acceptable formula to those that had been produced by different manufacturing methods. Keywords: Rheology / Stability / Texture / Manufacturing Process / Emulsion |
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| The Friction and Tactile Feel of Cosmetics | Yoshimune NONOMURA |
| <Abstract> The authors have developed a biomimetic haptic sensing system that mimics the mechanical phenomena that occur on the skin when a human touches an object to show the expression mechanism of various tactile sensations and guidelines for designing various products such as cosmetics. Here, we show an overview of the sensing system and our research on the tactile texture of cosmetic powders. Keywords: Tactile Feel / Friction / Cosmetics |
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| Development of D-ES Tecnology and Application for Cosmetics | Takehiko TOHJO, Masayuki UCHIYAMA |
| <Abstract> We have developed a D-ES (Direct Electro Spinning) technology and succeeded in forming a second skin-like membrane directly on the skin, consisting of the fine fiber of submicron diameter fibers. The membrane becomes transparent and unites with the skin by combining various cosmetic lotions. And it mimics the skin function that was originally present and behaves as barrier of skin, and as a result, it can realize a higher skin improvemnt effect than conventional cosmetic applications. We have started to apply this technique in the cosmetics category and are going to expand to medical applications in the future. Keywords: Electro-Spinning / D-ES / Fine Fiber / Cosmetics / Second Skin |
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| Polymer Science and I: A Personal Account |
| Coffee Room | Hirotaka EJIMA |
| <Abstract> Discussion with colleagues in the coffee room helped me to get new ideas. Research became more enjoyable when surrounded by interesting people with various backgrounds. I hope to provide an environment where students can freely discuss their research and nurture original ideas. |
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| Front-Line Polymer Science |
| Polymer-Grafting from Particles | Kohji OHNO |
| <Abstract> Significant advances in polymer chemistry have enabled the synthesis of polymer particles with unique structures, the morphology control of polymer chains attached to particle surfaces, and the control of arrangement and distribution of functional groups attached to particle surfaces. These achievements have produced various high-value-added particles. In particular, controlled or living polymerization from initiation sites immobilized on the surface of particles dramatically increased the density of polymer chains that can be grafted. This means that a novel polymeric architecture, the so-called concentrated polymer brush, is successfully grafted on the surface of particles. In the last 20 years, the development of science and technology for “polymer-grafting from particles” has been remarkable. It has handled various particles with the diameter ranging from nano to micrometer, making a great contribution to colloid chemistry. This paper introduces the recent research trends in the synthesis and application of functional particles using surface-initiated graft polymerization. Keywords: Particle / Colloid / Polymer Brush / Living Polymerization / Crystal / Structural Color / Surface / Interface |
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