TETRAFLUOROETHYLENE COPOLYMERS AND METHOD OF PRODUCING TETRAFLUOROETHYLENE COPOLYMERS Russian patent published in 2010 - IPC C08F214/26 

FIELD: chemistry.

SUBSTANCE: invention relates to tetrafluoroethylene copolymers. The copolymerisation method for producing tetrafluoroethylene copolymer, related to dispersion/finely dispersed powder, in which the copolymer contains essentially from 99.70 mol % to 99.99 mol % tetrafluoroethylene monomer links and from 0.01 mol % to 0.30 mol % copolymerised links of a comonomer of formula (C_nF_(2n+1))CH=CH₂, where 6≤n<10, involves the following steps: (a) copolymerisation of a monomer and a copolymer in a reactor operating under high pressure, (b) initiation of copolymerisation by adding potassium permanganate (KMnO₄), (c) carrying out copolymerisation reaction in the absence of any ionic force intensifier and (d) stopping addition of the initiator (KMnO₄) at a point corresponding to not more 80% completion of the reaction. The copolymer has size of primary particles of the initial dispersion less than 0.210 micrometres, and standard specific mass less than 2.143.

EFFECT: increased ultimate tensile strength.

35 cl, 2 tbl, 10 ex