Patent GB-949285-A (GB)
Title: Aqueous colloidal dispersions of polymer
IPC: C08F2/18
Filed: 1962-08-02
Abstract: Acid fluorides of formula:  F(CF2)m -O-[CFX-CF2-O-]n-CFX COF where X is fluorine or perfluoromethyl, m is 1 to 5 and n is 0 or 1 to 10 may be prepared by telomerising tetrafluoroethylene epoxide or hexafluoropropylene epoxide with carbonyl fluoride or a perfluoroalkyl acid fluoride. The products may be hydrolysed with water to the corresponding acids which may be converted to alkali metal and ammonium salts. The preparation of 3, 6-dioxa -2, 4-di(trifluoromethyl) heptafluoroheptanoyl fluoride by telomerising hexafluoropropylene epoxide with carbonyl fluoride in the presence of cesium fluoride is described. The product is hydrolysed with water and treated with ammonia. The acids and salts may be used as dispersing agents in aqueous media. Specifications 673,443 and 752,838 are referred to.ALSO:Stable aqueous dispersions of polymers of at least one monoethylenically unsaturated compound containing as dispersing agent an ionisable compound having a solubility in water of at least 0.1% at 100 DEG C. and having the general formula: F(CF2)m-O-[CF(X)-CF2-O-]n-CF(X)COOA where X is fluorine or trifluoromethyl, m is 1 to 5, n is 0 or 1 to 10 and A is hydrogen, or a monovalent metal or basic radical, may be prepared by polymerizing the monomers in the presence of an aqueous medium containing the said dispersing agent. Specified monomers are vinyl chloride, vinyl fluoride, vinylidene chloride, chlorotrifluoroethylene, tetrafluoroethylene, hexafluoropropylene, vinyl acetate, vinyl butyrate, acrolein, methacrolein, methyl vinyl ketone, methyl vinyl ether, ethyl vinyl ether, ethylene, propylene, styrene, acrylic acid, methacrylic acid, methyl acrylate, butyl acrylate, ethyl methacrylate, acrylamide, methacrylamide, acrylonitrile, itaconic acid, dimethyl fumarate, diethyl fumarate and vinyl pyridine. Polymerization may be effected in the presence of initiators such as persulphates, perborates, percarbonates, hydrogen peroxide, disuccinic acid peroxide, disodium azobis (g -cyanovalerate) and azobisisobutyramidine hydrochloride. Examples describe the polymerization of tetrafluoroethylene in the presence of disuccinic acid peroxide, iron powder, paraffin wax and dispersing agents of formulae (I) CF3 CF2 CF2-O CF(CF)3 CF2-OCF(CF3) COONH4, (II) CF3 CF2-OCF(CF3)CF2 OCF(CF3) COONH4, (III) CF3-OCF (CF3) CF2OCF(CF3)-COONH4, (IV) CF3 CF2 CF2 OCF (CF3) CF2 OCF(CF3) COONH3CH3, (V) CF3 CF2 CF2 -OCF(CF3) CF2 OCF (CF3) COONH2 (CH3)2, (VI) CF3 CF2 CF2 OCF (CF3) CF2 OCF (CF3) COONH (CH3)3, (VII) CF3 CF2 CF2 -OCF (CF3) CF2 OCF (CF3) COON (CH3)4, (VIII) CF3 CF2 CF2 OCF-(CF3) CF2 OCF (CF3) COO NH3 CH2 OH, (IX) CF3 CF2 CF2-OCF (CF3) CF2 OCF (CF3) COONa, (X) CF3-CF2 CF2 O [CF (CF3) CF2O]2 CF (CF3)-COONH4, (XI) CF3 CF2 CF2 O [CF (CF3) CF2O]3, CF (CF3) COONH4, (XII) CF3 CF2-CF2 OCF (CF3) COOH, (XIII) CF3 CF2 CF2-OCF (CF3) CF2 OCF (CF3) COOH, (XIV) CF3 CF2 CF2 O[CF(CF3) CF2O]2 CF(CF3)-COOH, and (XV) CF3 CF2 CF2 O[CF(CF3)-CF2O]3 CF (CF3) COOH; the copolymerization of tetrafluorethylene and hexafluoropropylene in the presence of disuccinic acid peroxide, iron powder, paraffin wax and dispersing agents of formulae (XVI) CF3 CF2 O CF2 CF2 OCF2-COONH4, (XVII) CF3 CF2 O[CF2 CF2O]2 CF2 COONH4 and (XVIII) CF3 CF2 CF2O-CF (CF3) CF2 O CF (CF3) COONH4; and the polymerization in the presence of potassium persulphate and ammonium 3, 6-dioxa -2, 4-di(trifluoromethyl) undecafluorononanoate of (XIX) chlorofluoroethylene in the presence of paraffin wax, (XX) styrene, (XXI) acrylonitrile, (XXII) vinyl acetate and (XXIII) tetrafluoroethylene and hexafluoropropylene. The dispersions may be used for making fibres and films and for coating wood, metal, ceramics and textiles. Specifications 673,443 and 752,838 are referred to.