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Volume 33 (1999)
- Issue 4 Pages 343-
- Issue 3 Pages 213-
- Issue 2 Pages 99-
- Issue 1 Pages 3-
Volume 33, Issue 4
Displaying 1-6 of 6 articles from this issue
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Masamichi Morita, Tatsuhiko Watanabe, Motonobu Kubo, Kazuo Shimamoto, ...1999 Volume 33 Issue 4 Pages 343-353
Published: December 20, 1999
Released on J-STAGE: August 06, 2010
JOURNAL FREE ACCESSProperties of the perfluoroalkylethyl acrylate (FA) copolymers and their applications for cosmetics were studied. The main conclusions from this study were summarized as follows: firstly, the FA copolymers which include hydrophobic comonomers made it possible to mix fluorinated compounds with non-fluorinated materials easily. This comes from the ability of FA copolymer to decrease the interfacial tension at fluorinated compound/non-fluorinated solvent. This technique can be applied to prepare the non-aqueous emulsion (perfluoropolyether/non-fluorinated solvent type) and the foundations which contain a large quantity of fluorinated powders. Secondly, the FA copolymers which include hydrophilic comonomers made it possible to repel oil both in air and in water. Its behavior was demonstrated by the surface chemistry-based measurement used with flat substrate (PET film) and with powder substrate (talc). This technique may be applied to prepare the cosmetics which are durable against sebum in all environments.View full abstractDownload PDF (3131K) -
Ryuichi Inaba, Eiichi Saito, Toshiaki Kobayashi, Yoshio Fujiyama1999 Volume 33 Issue 4 Pages 354-363
Published: December 20, 1999
Released on J-STAGE: August 06, 2010
JOURNAL FREE ACCESSTrimethylsiloxysilicate (TMS) is used in various types of cosmetics because it forms a protective film that is highly water repellent, lubricating, and lasting. The authors tried to develop silicone polymers that contain titanium dioxide (trimethylsiloxysilicate containing titanium dioxide: TMST) to improve the optical properties of TMS. We prepared TMST by exploiting the sol-gel reaction to co-hydrolyze and polymerize silicone alkoxide and titanium (IV) alkoxide, while trimethylsilylating the intermediates. The TiO2 units in TMST were strongly bound to and homogeneously incorporated in the ≡Si-O-Si≡ network structure, rather than the simple dispersion of particles of a fine titanium dioxide in TMS. The component units of TMST are [(CH3)3SiO1/2]:[SiO2]:[TiO2] (mol ratio 1.4:1.2:0.4). TMST is capable of forming film, which, although containing 9.0% titanium dioxide by weight, has good transparency because the titanium dioxide is highly dispersed and anchored. TMST retains the solubility of TMS, which has been a popular material for cosmetics, as well as the functional (transfer resistant and water repellent) film forming capabilities of TMS. In addition, TMST has the unique optical characteristics (higher refractive index and ultraviolet screening function) attributable to the titanium dioxide contained. These results demonstrated that TMST is very useful as a new functional film forming agent in cosmetics.View full abstractDownload PDF (2929K) -
Tooru Sugawara, Mizue Kawai, Toshiyuki Suzuki1999 Volume 33 Issue 4 Pages 364-369
Published: December 20, 1999
Released on J-STAGE: August 06, 2010
JOURNAL FREE ACCESSIt is well known that nail damages such as yellowing, split nails and peeled nails (onychoschisis) are caused by continuous use of nail enamel for a long period. Within serious nail damages, we aimed at split nails and peeled nails and basically investigated the relationship between fingernail moisture content and the mechanical properties and the structure of fingernails to make clear the factors affecting those nail damages. As a result, fingernail moisture content was lower than plantar horny layer one. The change in fingernail volume due to moisture absorption was much more considerable in thickness than in length and width. It is suggested that the state of fingernail is changed by moisture absorption from the result of E′ and tan δ of the fingernail dipped in water. Moreover we propose the mechanism that cause split nails and peeled nails.View full abstractDownload PDF (1867K) -
Makoto Fujii, Koichi Shimmoto1999 Volume 33 Issue 4 Pages 370-376
Published: December 20, 1999
Released on J-STAGE: August 06, 2010
JOURNAL FREE ACCESSObjective evaluation of psychophysiological effects is needed to develop the cosmetics with relaxation effectiveness. Recently, analyzing brain waves is used for evaluating these effects. For example, these effects are evaluated qualitatively by comparing power spectra of brain waves with and without stimulus. However quantifying variation in power spectra by stimulus is not easy, because the variation is affected by environment such as emotion, situation, etc. This paper proposed the new method for extracting the variation quantitatively. In this method, giving cyclic stimulus to human, the variation, which arises along the cycle, can be extracted by STFT (Short Time Fourier Transform) and FFT. Moreover, experimental system was constructed based on our theories. Odor stimulus as peppermint and spearmint were tested, and the variations being able to extract quantitatively was shown. In case of peppermint, components of power spectra were increased in area of 4-6Hz, and in spearmint, the components were also increased in 9-11Hz. From these results, it was suggested that the proposed method was useful for objective evaluation of psychophysiological effects.View full abstractDownload PDF (2647K) -
Hiromi Kono, Kaoru Suganuma, Toshimasa Furukawa1999 Volume 33 Issue 4 Pages 377-385
Published: December 20, 1999
Released on J-STAGE: August 06, 2010
JOURNAL FREE ACCESSChanges in the physical characteristics (surface friction and bending characteristics) and perceptual qualities of human hair during temperature and humidity change were evaluated using KES and a sensory evaluation method. The standard setting for the temperature and the humidity was 20°C, 65% RH, while low and dry was 15°C, 30% RH and high and humid was 30°C, 80% RH. Ten strands of hair were taken from the head of Japanese woman in her 20s who had never had her hair chemically treated. The process of perming, brushing, bleaching and more brushing was repeated 4 times on 5 of the 10 healthy strands to create a damaged condition. The healthy and damaged strands were then treated with typical cationic cellulose and silicone oil. We obtained the following results. 1) There was a correlation between the physical characteristics and sensory evaluation. 2) Both the healthy and damaged hair became smooth due to the reduced friction factor at high temperature and humidity. 3) Both the healthy and damaged hair became soft due to the reduced bending rigidity at high temperature and humidity. 4) It is easy to compare and examine the subtle differences due to various treatments when the physical characteristics and sensory evaluation are performed under the standard conditions or low temperature and humidity conditions.View full abstractDownload PDF (1250K) -
[in Japanese]1999 Volume 33 Issue 4 Pages 387-390
Published: December 20, 1999
Released on J-STAGE: August 06, 2010
JOURNAL FREE ACCESSDownload PDF (2299K)
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