A film was prepared from an n-butyl methacrylate/methacrylamide ethylethyleneurea (EU) copolymer [P(BMA-EU)] emulsion produced by an emulsifierfree emulsion copolymerization. The wet adhesion of the emulsion film on an alkyd resin was significantly improved by copolymerization with a small amount of EU (0.5-1.0 mol %). A sodium dodecyl sulfate emulsifier, postadded to the emulsifier-free emulsion, reduced the wet adhesion. The wet adhesion of a film prepared from a poly(n-butyl methacrylate) (PBMA)/P(BMA-EU) composite emulsion produced by an emulsifier-free seeded emulsion copolymerization with PBMA seed particles was higher than that of a P(BMA-EU) film with the same EU content. The localization of EU and the cleanliness at the particle surface were also key factors in the improvement of the wet adhesion of the polymer emulsion film.
A two-layer film consisting of a tacky layer (air side) and a porous nontacky layer (release-paper side) was prepared by casting blend emulsion on a release paper, in which 150-nm 2-ethylhexyl acrylate-2-methoxyethyl acrylate-acrylic acid terpolymer particles having high storage stability and 542-nm ethyl acrylate-methyl methacrylate copolymer particles having low storage stability were dispersed. Both emulsion particles were produced by emulsifier-free emulsion copolymerizations. The difference of tackiness between both surfaces increased with increases in the film-formation time and the concentration of electrolytes in the blend emulsion, and resulted in the two-layer film. The film had a high water vapor permeability, which is also needed for medical adhesive tape.
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