Preparation of a heterogeneous polymer film from the blend emulsion by the stepwise heterocoagulation method

The blend emulsion of two kinds of polymer particles, in which almost all of the cationic soft small particles (SPs) were adsorbed onto the anionic hard large particles (LPs) by utilizing a stepwise heterocoagulation method proposed by the authors in 1990, was cast to a micro-heterogeneous film. In the film, LPs played a discontinuous phase and SPs with a content of 30 wt.% played a continuous one as film forming additives. The storage stabilities of the blend emulsions after the stepwise heterocoagulation were examined under various conditions, and the morphology of the film was estimated from the attenuated total reflectance Fourier-transform infrared spectroscopic. (C) 1999 Elsevier Science B.V. All rights reserved.