Development of a Water-Resistant and Detergent-Washable Powder Coated with a Stimuli-Responsive Polymer and its Application to Suncare Products / Tomo Osawa in IFSCC MAGAZINE, Vol. 12, N° 1 (01-02-03/2009)

[article]  inIFSCC MAGAZINE > Vol. 12, N° 1 (01-02-03/2009) . - p. 3-7 Titre : Development of a Water-Resistant and Detergent-Washable Powder Coated with a Stimuli-Responsive Polymer and its Application to Suncare Products Type de document : texte imprimé Auteurs : Tomo Osawa, Auteur ; Shin-Ichi Yusa, Auteur ; Isamu Kaneda, Auteur ; Shuji Nishihama, Auteur ; Masayuki Shirao, Auteur ; Atsushi Sogabe, Auteur Année de publication : 2009 Article en page(s) : p. 3-7 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Detergent-washable  PH-responsive  polymer  powder  Sun  care  product  Water-resistant Index. décimale : 668.5 Parfums et cosmétiques Résumé : It is generally well known that the surface of an inorganic UV-protective powder used in a sunscreen formula is treated with a fatty acid or other hydrophobic chemicals to obtain a high water resistance. Due to the resulting strongly hydrophobic surface, the treatment has a clear drawback in that it allows the sunscreen to leave its base components on the skin after washing with regular soap. Therefore, in this study to develop an intelligent sunscreen formula that has a high water resistance and can be washed away easily with regular soap, we focused on a pH-responsive polymer as the surface-treatment agent for a UV-protective powder. Numerous experiments led to the synthesis of the 2-acrylamido-2-methyl-1-propanesulfonic acid/11-methacrylamidoundecanoic acid (AMPS/MAU) copolymer, which is hydrophobic in acidic to neutral solution and hydrophilic in basic solution. Titanium dioxide subjected to surface treatment was treated with the AMPS/MAU copolymer showed a high pH-responsiveness that was similar to that of the polymer. A W/O-type sunscreen containing the pH-responsive titanium dioxide showed a high water resistance as well as a high washability with regular soap. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4771 [article]

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Super-rapid drying "dip-in-water" nail enamel / Katsuyuki Kaneko in IFSCC MAGAZINE, Vol. 3, N° 4 (10-11-12/2000)

[article]  inIFSCC MAGAZINE > Vol. 3, N° 4 (10-11-12/2000) . - p. 25-29 Titre : Super-rapid drying "dip-in-water" nail enamel Type de document : texte imprimé Auteurs : Katsuyuki Kaneko, Auteur ; Ryota Yamasaki, Auteur ; Toshihito Yabu, Auteur ; Yoshikazu Soyama, Auteur ; Yoshimaru Kumano, Auteur ; Isamu Kaneda, Auteur ; Toshio Yanaki, Auteur Année de publication : 2000 Article en page(s) : p. 25-29 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.5 Parfums et cosmétiques Résumé : In order to accomplish quick-drying speeds exceeding that of present nail enamels, we have developed an innovative idea, "drying with water" . This idea was based on the concept that the drying process is regarded as a precipitation of film forming ingredients. We anticipated that by dipping the applied nail enamel in water, the solvent would dissolve into the water and minute amounts of the water would be taken into the enamel. These two actions would rapidly decrease the solubility of the film forming ingredients and result in rapid film forming. In order for this work, the solvent should be miscible in water. Most solvents used in conventional enamels are insoluble in water, therefore a new solvent system needed to be investigated. The film formed in water needs to be glossy and wearable. Therefore, various resins in conventional nitrocellulose formula were investigated. From the research below, we have developed a formula for super-quick drying nail enamel with 1/4 to 1/5 the drying time of conventional ones. This new nail enamel is also designed to dry normally in air with the same speed as conventional ones do. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10792 [article]

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Use of associating polymers as multifunctional thickeners : studies of Their structure in aqueous solutions via nmr, qels, fluorescence, And rheology measurements / Katsunori Yoshida in IFSCC MAGAZINE, Vol. 10, N° 1 (01-02/2007)

[article]  inIFSCC MAGAZINE > Vol. 10, N° 1 (01-02/2007) . - p. 35-39 Titre : Use of associating polymers as multifunctional thickeners : studies of Their structure in aqueous solutions via nmr, qels, fluorescence, And rheology measurements Type de document : texte imprimé Auteurs : Katsunori Yoshida, Auteur ; Ayano Nakaruma, Auteur ; Yuki Nakajima, Auteur ; Tadao Fukuhara, Auteur ; Haruhiko Inoue, Auteur ; Isamu Kaneda, Auteur Année de publication : 2007 Article en page(s) : p. 35-39 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Epaississant  Viscosité  'Polymère  associé'  'Résonance  magnétique  nuclaire  (RMN)Qels  Fluorescence  Rhéologie Index. décimale : 668.5 Parfums et cosmétiques Résumé : The solution properties of an associating polymer were studied by NMR, quasi-elastic light scattering (QELS), fluorescence, and rheology measurements. An associative thickening (AT) polymer was designed having a nonionic poly(ethylene oxide) backbone with long alkyl chains at both ends to achieve high viscosity even at relatively high salt concentrations and over a wide pH range. This study focuses on the associative state of the polymer in aqueous solutions at various polymer concentrations. In a fluorescence probe study using pyrene a spectral change in the I3/I1 ratio was observed for pyrene at a polymer concentration (Cp) of 3 x 10-4%, indicating an apparent critical concentration (cmc) of the amphiphilic polymer. The viscosity, self-diffusion coefficient (Dsel), and hydrodynamic size (Rh) distribution measurements at various Cp all suggest that there is a second transition at Cp≅ 0.4%. Although we observed the discontinuity in viscosity, Dsel, and Rh at Cp≅ 0.4%, no changes in the relaxation times (T1 and T2) were recognized for either the alkyl chain or the ethylene oxide moiety of the polymer at C p= 0.1–1%. These data suggest that there are no structural changes or phase transitions at Cp≅ 0.4%, but that intermicellar networks are presumably formed by bridging of the end alkyl groups of the polymer, which is driven by hydrophobic forces. Because the polymer forms networks by hydrophobic interaction and the polymer itself is nonionic, the viscosity of the polymer solution was influenced very little by either the addition of salt or a pH change, as would be expected. The dynamic viscoelastic study revealed that the polymer solution exhibits a single mode Maxwell type relaxation behavior with a terminal relaxation time of about 0.61 s, which imparts a unique flow appearance to the polymer solutions. The time course measurements of the dynamic elastic modulus of the stratum corneum revealed that the polymer has excellent potential for skin softening. It was concluded that the associative thickening polymer not only is a useful thickener with a salt and pH tolerance but also has beneficial skincare effects. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10427 [article]

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