Effect of Film Forming Agent on Particle Coalescence in Polymer Emulsion Films

Tooru SUGAWARA*, Hitoshi HOSOKAWA and Takeaki IIDA†

Cosmetic Research Laboratories, Kao Corporation; 2-1-3, Bunka, Sumida-ku, Tokyo 131-8501 Japan
† Graduate School of Science and Engineering, Saitama University; 255 Shimo-okubo, Saitama-shi 338-8570 Japan

Effect of film forming agent on the particle coalescence in methyl methacrylate-butyl acrylate-acrylic acid copolymer emulsion films was investigated. From the results obtained, as the solubility parameter of the film forming agent was close to the solubility parameter of the polymer and as the boiling point of the film forming agent became high, the coalescence of the polymer particles was accelerated. Also as the solubility parameter of the film forming agent was close to the solubility parameter of the polymer and as the boiling point of the film forming agent became high, Ra (surface roughness) of the film surface decreased. However, the particle coalescence of the polymer emulsion films was incomplete. In addition, it was found that Ra of the film surface had a correlation with ΔMFT (difference of minimum film-forming temperature).


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