Aqueous dispersion of different fluoro-polymers giving compact, thick film with high dielectric strength

摘要

The invention relates to aqueous dispersions of fluoropolymers obtained by emulsion polymerisation, containing at least one fluoropolymer A) with a mean particle size (number average) of at least 200 mn and at least one fluoropolymer B) with a mean particle size (number average) of no more than 100 nm. One of the components A) and B) is a thermoplastic material and the other component cannot be processed from its melted form. In the dispersion as a whole, numeric distribution of particle diameter is non-unimodal. Said dispersions are suitable for soaking, impregnating or coating surfaces, for example fibres or flat structures made of fibres or porous substances, in particular for coating fibre glass tissues, and for the formulation of metal coating systems.