THERMOPLASTIC FLUOROPOLYMER MIXTURES Russian patent published in 2003 - IPC

FIELD: polymer production. SUBSTANCE: invention relates to thermoplastic polymers containing tetrafluoroethylene units and perflluoroalkyl vinyl ether units, their mixtures, and also to processes and to products wherein indicated polymers are involved. Mixture of thermoplastic fluoropolymers mainly containing tetrafluoroethylene units and 0.5 to 10 mol % of units of one or more perflluoroalkyl vinyl ethers having 1-4 carbon atoms in perflluoroalkyl radical. This mixture contains: at least 20 and no more than 90% at least one fluoropolymer A (component A) with melt index I(A) at least 30 and no more than 90 wt % and at least 10% fluoropolymer B (component B) with melt index I(B) no higher than 15. Components are selected such ratio I(A)/I(B) were within the range between 80 and 2500. Invention also relates to low-molecular thermoplastic fluoropolymer, to method for manufacturing profiled articles, and to profiled articles. Mixtures of invention are used when manufacturing thin-wall articles via extrusion or extrusion with blowing and via jet molding. EFFECT: essentially accelerated extrusion without disruption of extrusion flow and enabled processing under elevated temperatures. 19 cl, 8 tbl, 11 ex