PTFE latexes are aqueous dispersions with particle size of 0.2-0.3 �m. Particles are charge-stabilized, and are sterically stabilized in formulations for coating applications. Coagulation and heterocoagulation are very important in a number of industrially important processes. Microcomposites based on charge-stabilized latexes could be prepared by the heterocoagulation of mixed PTFE-pigment dispersions. The control of the surface properties of the dispersion components allowed the preparation of microcomposites with uniformity down to the ultimate particle size. Properties of sterically stabilized dispersions,like films and coatings, depend upon the absence of cracks on high thickness films. Coagulation during drying plays an important role in controlling the uniformity of the film. Nanosize fluoropolymer dispersions could be obtained by microemulsion polymerization of fluorinated monomer. Bimodal PTFE dispersions obtained by mixing of micro- and nanoparticles allow a sharp increase in the attainable thickness of continuous PTFE films.

Coagulation and heterocoagulation in PTFE particles dispersions

244th National Meeting (2012)

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