POLYMER FOR SKIN PROTECTION

摘要

PURPOSE:To obtain an acrylic polymer low in a residual monomer content, substantially free of any surfactant and suitable as a skin-protecting agent, by copolymerizing ethyl acrylate with methacrylic acid at a specified ratio. CONSTITUTION:This skin-protecting polymer has a monomer ratio of ethyl acrylate to methacrylic acid in the range of 75/25-95/5 by weight, has a residual monomer content <=50ppm and is substantially free of any surfactant. Said polymer can be obtained, for example, by reacting said monomer mixture with heating in deionized water in the presence of a persulfate as a polymerization initiator and after-treating the product by the addition of a small amount of a redox catalyst comprising a combination of hydrogen peroxide with ferrous sulfate and L-ascorbic acid.