- EXTERNAL PREPARATION FOR THE SKIN AND COPOLYMER TO BE USED THEREIN
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An object of the present invention is to provide an external preparation for the skin, which shows an excellent effect of sufficiently protecting the living body against irritants that exist in the external environments, and a polymer material to be preferably used therein. Provided is an external preparation for the skin obtained mixing a copolymer which comprises constituent units derived from monomers of the general formula (I), (II) and, if necessary, (IV) with the content of units (I) ranging from 5 to 25 wt % based on the total amount of all the constituent units, preferably with the contents of units (I), (II) and (IV) being 5 to 9.8 wt %, 30.2 to 45 wt %, and 50 to 60 wt %respectively, with other optional components. In the formula, R1 is H or C1-3 alkyl; R2 is C5-12 alkyl having 8 to 21 fluorine atoms; R3 is H or C1-3 alkyl; R4 is optionally hydroxylated C2-4 alkylene; R5 is H, a C1-20 aromatic group, a C1-20 aliphatic hydrocarbon group, or C1-20 acyl; and n is 4 to 50.
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Page/Page column 9
(2008/06/13)
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- Synthesis of fluorinated block copolymers and their application as novel polymerisation surfactants in supercritical carbon dioxide
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Screened anionic copolymerisation of methyl methacrylate with the perfluoroalkyl methacrylates 2 affords well-defined AB block copolymers 4-6, which serve as effective surfactants in the dispersion polymerisation of methyl methacrylate in supercritical carbon dioxide.
- Yong, Tuck-Mun,Hems, William P.,Van Nunen, Johanna L. M.,Holmes, Andrew B.,Steinke, Joachim H. G.,Taylor, Philip L.,Segal, John A.,Griffin, David A.
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p. 1811 - 1812
(2007/10/03)
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Several fluorinated and chlorofluorinated acrylates and methacrylates were synthesized from the alcohols RFCH2OH with RF=CCl3, CHClCH2CCl3, (CF2CFCl)nCl, (C2F4)nH, CF3, C7F15 and C6F13CH2. The corresponding polymers were also studied for their application as transparent polymeric materials. For this purpose the refractive indices n20D of the monomers and the polymers were measured as were the Tg values of the polymers. A study of their infrared spectra shows to what extent these products could be utilized taking into consideration their absorption in the long wavelength range between 0.85 and 1.50 m. The refractive indices of these polymers, which are reduced when increasing the number of fluorine atoms in the molecule, and that of the Tg measured between 50 and 70° C for the fluorinated methacrylates, indicate a potential use of these polymers as sheathing materials for optical fibres.
- Boutevin,Rigal,Rousseau,Bosc
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