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    PROCESS FOR PRODUCING FLUOROCARBON POLYMERS THAT CONTAIN CARBOXYL GROUPS, SOME STARTING MATERIALS THEREFOR AND THE FLUOROSULPHATE COMPOUNDS OCCURRING AS INTERMEDIATES IN THE PROCESS
    11.
    发明专利
    PROCESS FOR PRODUCING FLUOROCARBON POLYMERS THAT CONTAIN CARBOXYL GROUPS, SOME STARTING MATERIALS THEREFOR AND THE FLUOROSULPHATE COMPOUNDS OCCURRING AS INTERMEDIATES IN THE PROCESS 未知

    公开(公告)号：DE3374200D1

    公开(公告)日：1987-12-03

    申请号：DE3374200

    申请日：1983-02-23

    Applicant: HOECHST AG

    Inventor： BLICKLE PETER DR ,  BRANDRUP JOHANNES DR ,  MILLAUER HANS DR ,  SCHWERTFEGER WERNER DR ,  SIEGEMUND GUNTER DR

    IPC: C08F8/12

    Abstract: (1).COOH gp.-contg. uncrosslinked fluorocarbon polymers are prepd. by (a) first reacting partly new uncrosslinked fluorocarbon polymers in which linear macromols. bear side-chains having the end-gp. -CHFX (where X is F or CF3) with peroxydisulphuryl difluoride FSO2O-OSO2F to form the corresp. fluorosulphato derivs. (I), contg. side-chain end-gps. -CFX-OSO2F. (b) If (i) X is F, (I) are reacted with an alcohol havino formula ROH (where R is 1-6C alkyl, esp. Me or Et) to form esters having side-chain end qps. -COOR, which are saponified to the free -COOH gps., as such or in salt form. Alternatively, (I) are hydrolysed directly with water, in the presence of a solvent, and/or base, to prods. contg. -COOH in free or salt form as the side-chain end gp. If (ii) X is CF3, (I) are decomposed to ketones contg. side-chain end gps. -CO-CF3 in the presence of alkali fluoride- and/or aprotic N base catalysts. The ketones are then hydrolysed to prods. contg. -COOH, in free- or salt form, as side-chain end gps. (2).New uncrosslinked fluorocarbon copolymers, used as raw materials, contain repeat units having formula -CF2-CF(-(-OCF2CFY-)u-Ov-(CF2)w-CHFX)- (A) (where u is 0, 1 or 2; v is 0 or 1; w is 1-7; X and Y each is F or CF3) and repeat units having formula -CF2-CFZ- (B) (where Z is Cl, F, Rf or -ORf; Rf is CF3 or opt. O atom-interrupted 2-8C perfluoroalkyl) provided (A):(B) molar ratio is 1:(2-20) esp. 1:(2-8). Intermediates (I) are also new. The COOH gp.-contg. uncrosslinked fluorocarbon polymers are used as cation exchanqer membranes in electrolysis cells, esp. in alkali chloride electrolysis.

    15.
    发明专利
    未知

    公开(公告)号：DE1767564A1

    公开(公告)日：1971-09-09

    申请号：DE1767564

    申请日：1968-05-24

    Applicant: HOECHST AG

    Inventor： BURG KARLHEINZ DR ,  CHERDRON HARALD DR ,  BRANDRUP JOHANNES DR

    IPC: A61F13/04 ,  A61L15/07 ,  C08G2/24 ,  C08G37/02

    Abstract: 1,268,545. Stiffening bandage. FARBWERKE HOECHST A.G. 27 May, 1969 [24 May, 1968], No. 26756/69. Heading A5R. [Also in Divisions B2 and C3] A polyacetal comprising a copolymer of trioxan and certain cyclic formals in specified proportions are used as bandages either as such or on a fabric carrier. The copolymers soften between 40‹ and 80‹C and the bandages may thus be applied by gentle heating within this range and allowing to cool after application. It may be removed by reheating. Several layers may be applied. Specified fabrics are cotton, wool, cellulose acetate, polyacrylonitrile and polyesters. The bandages are stated to be X-ray permeable.

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