Effect of Particle Coalescence in Polymer Emulsion Films on Mechanical and Morphological Properties

Tooru SUGAWARA*, Hitoshi HOSOKAWA, Takeaki IIDA and Toshiyuki SUZUKI

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-0kubo, Urawa-shi 338-8570 Japan

Mechanical and morphological properties of methyl methacrylate-butyl acrylate-acrylic acid copolymer emulsion films were investigated. As a result, the elevation of drying temperature accelerated the coalescence of polymer particles. The coalescence of polymer particles was completed at drying temperature above 48 °C from MFT (minimum film-forming temperature) . In addition, the surface of the film was very flat like the surface of polymer solution film. We found out that the Ra (surface roughness) of the film surface had a relation with the coalescence rate of polymer particles. Moreover, we found out that the tensile strength and the peel strength of the film increased with the decrease of Ra. The water absorbing capacity of the film had no relation with the coalescence rate of the polymer particles.

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