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    6.
    发明专利
    未知

    公开(公告)号：DE3786435D1

    公开(公告)日：1993-08-12

    申请号：DE3786435

    申请日：1987-09-09

    Applicant: HOECHST AG

    Inventor： BLICKLE PETER DR ,  HINTZER KLAUS DR ,  LOEHR GERNOT DR ,  SCHWERTFEGER WERNER DR

    IPC: C08L27/12 ,  B01D65/10 ,  B01D67/00 ,  B01D71/32 ,  C08J3/09 ,  C08J5/22

    Abstract: In a soln. (I) of a fluoropolymer (II) in a halogenated solvent, the solvent is a (per)fluoroalkane or (per)fluoroalkyl ether of formula Rf-CFX-(CF2)n-(CF2-O-CF(CF3))m-R'f (III); R'f = -CF2-O-CFY-CF2Y, -CFY-CF2Y, -CF2Y or R''f-CFX'-(CF2)n'-(CF2-O-CF(CF3) -)m'-; Rf and R''f = F or 1-3C perfluoroalkyl; X = H, F, Cl, Br or I: X' = H, Cl, Br or I; n and n' = 0-10; m and m' = 0-5; Y = H, Cl or Br; such that (III) has a b.pt. of max. 190 deg.C at normal pressure if at least one of X, X' and Y do not = H and also m = 0 only if R'f = -CFY-CF2Y or -CF2Y. X = H, F, Cl or Br; n = 0-6; m = 0-3; R'f = -CF2-O-CFBr-CF2Br or R''f-CFH-(CF2)n'-(CF2-O-CF(CF3)-)m'-. (III) has a b.pt. of max. 180 deg.C. (I) pref. contains 0.5-30wt.% (II), which pref. has recurring units of formula (IIA); u = 0, 1 or 2; v = 0 or 1; w = 1-7; A' and B' = F or CF3; D = H, Cl, Br or -COOR; R = 1-10C alkyl. Pref. (II) has 10-50 mole-% (IIA) units with u at least = 0 and/or v = 1. (II) may also contain units of formulae -CF2-CFE, -SO2F and/or -CG; E = Cl, F, Rf or ORf; Rf = CF3 or 2-8C perfluoroalkyl, opt. with 0 in the chain; G = OOR; R = 1-10C alkyl).

    Fluoro-polymers contg. carboxyl gps. or gps. derived. therefrom - by oxidn. of omega-h per:fluoro side chains, at 150-300 deg. C to form cof gps.
    8.
    发明专利
    Fluoro-polymers contg. carboxyl gps. or gps. derived. therefrom - by oxidn. of omega-h per:fluoro side chains, at 150-300 deg. C to form cof gps. 未知

    公开(公告)号：DE4040674A1

    公开(公告)日：1991-07-04

    申请号：DE4040674

    申请日：1990-12-19

    Applicant: HOECHST AG

    Inventor： BLICKLE PETER DR ,  HINTZER KLAUS DR ,  LOEHR GERNOT DR ,  SCHWERTFEGER WERNER DR

    IPC: C08F8/06

    Abstract: Perfluorinated polymers (I) contg. monomer units of formula (II) (with m = 0-3; n = 2-10; X = COF) are produced by reaction of the corresp. polymer (III) contg. units of formula (II) (with X = CF2H) at 150-300 deg C with a gaseous oxidising agent (IV) which is capable of liberating iodine from acidified aq. KI soln. Pref. (I) also contain monomer units of formula CF2=CF-R (with R= F or 1-10C perfluoroalkyl, pref. F or CF3), and pref. F or CF3), and pref. also units of formula (II) (with m = 0-3; n = 1-10; X = CF3); pref. comonomer units are omega-H-perfluoropropyl perfluorovinyl ether (H-PPVE) and TFE, esp. pref. with perfluoropropyl perfluorovinyl ether (PPVE) as third comonomer; (IV) is a nitrogen oxide, or air, O2, ozone or a mixt.; polymers (I) (with X = COOH or X = CONH2) are produced directly by adding to (IV) an amt. of water vapour or NH3 which is equal to or greater than the mol. wt. of CF2H gps.. USE/ADVANTAGE - (I) (with COOH or carboxy derivs. as functional gps.) are useful for the prodn. of cation exchange membranes for chlor-alkali electrolysis, and for the prodn. of hydrophilic coatings on hydrophobic polymer surfaces. The invention provides a simpler, less expensive process for the prodn. of (I), compared with prior-art processes.

    10.
    发明专利
    未知

    公开(公告)号：DE4022405A1

    公开(公告)日：1992-01-16

    申请号：DE4022405

    申请日：1990-07-13

    Applicant: HOECHST AG

    Inventor： FELIX BERND DR ,  LOEHR GERNOT DR ,  HOFMEISTER WILLIBALD DIPL ING ,  HENGEL ROLF DR

    IPC: C08F2/18 ,  C08F14/26

    Abstract: In the suspension polymerization of tetrafluoroethylene a mixture of tetrafluoroethylene and an inert gas is charged under pressure before starting the polymerization, the total pressure being 5 to 50 bar and the concentration of tetrafluoroethylene in this mixture being 30 to 70 mol %. Said concentration is kept within this range by an appropriate feed of tetrafluoroethylene during the polymerization. The granular PTFE powder obtained is distinguished by an improved grain structure and grindability.

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