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

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 DeltaMFT (difference of minimum film-forming temperature).