FIELD: production of coating of glass fabric, on metal and electron plates; production of films. SUBSTANCE: concentration of aqueous dispersion of fluoropolymer is carried out by production of aqueous dispersion which takes place at pH about 6 or more. In dispersion, at least, one concentrating agent is added, the process is carried out till its concentration in mixture is 0.01-0.5 mass % as calculated for water. Then mixture is allowed to stand till concentration process and separation into upper and lower phases are finished, said phases are separated. Polymers chosen from group which includes polyacrylic acid, salt of polyacrylic acid, acrylic polymer and salt of acrylic polymer having content of acid not less than 20 % and having average molecular weight 50000-500000, are used as concentrating agent. (Co)polymer, terpolymer, tetrapolymer on the base of ethylene unsaturated monomer which comprises, at least, one fluorine atom, e.g. polytetrafluoropolymer, or copolymer of tetrafluoropolymer with perfluorovinyl ether, is used as mentioned above fluoropolymer. If dispersion of copolymer is concentrated then polyacrylic acid is used as concentrating agent, if dispersion of polytetrafluoroethylene is concentrated then polyacrylic acid is used as concentrating agent, Before adding of concentrating agent or simultaneously with it agents which stabilize dispersion may be additionally applied, the process is carried out till their concentration in dispersion is 0.05-0.12 % of mass of polymer. Ionic or nonionic surfactants, polyalcohols or mixture thereof are used as agents which stabilize dispersion. Nonionic surfactant may be applied in lower phase at separation stage, its quantity being 1-12 % of mass of water which comprises in lower phase. EFFECT: improved efficiency. 8 cl, 1 dwg
