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    Production of emulsion polymers
    2.
    发明专利
    Production of emulsion polymers 未知

    公开(公告)号：GB993750A

    公开(公告)日：1965-06-02

    申请号：GB3463762

    申请日：1962-09-11

    Applicant: BASF AG

    Inventor： GUENTHER WOLFGANG ,  OHLINGER HELMUT

    IPC: C08F2/22 ,  C08F2/26

    Abstract: A carboxylic, sulphinic or sulphonic acid salt of an oligomeric styrene of general formula where R1 and R2 are H or a C1-8 alkyl, X is -CO2-, -SO2- or -SO3-, Y is MeX- or -H, Me is a metal radical or ammonium and n is 1-18, is prepared by preparing the corresponding metal compound from styrene or an alkyl styrene in tetrahydrofuran and then reacting the metal compound with either carbon dioxide to form the carboxylic acid salt or sulphur dioxide to form the sulphuric acid salt which may then be converted, e.g. using hydrogen peroxide, to the sulphonic acid salt. In examples 2 moles of sodium were stirred with 4-8 moles a -methylstyrene in tetra-hydrofuran, dry carbon dioxide or sulphur dioxide was passed into the solution and the tetrahydrofuran was evaporated off to leave the salt; and 1 mole of sodium was stirred with 1 mole of napthalene and 6 moles of styrene or vinyltoluene were added, sulphur dioxide or carbon dioxide was passed into the solution and the tetrahydrofuran and naphthalene were evaporated off to leave the salt.ALSO:Emulsion polymers are produced by polymerization of ethylenically unsaturated monomers in aqueous emulsion in the presence of catalysts wherein there is used an emulsifier of formula where R1 and R2 are H or C1-8 alkyl; X is -CO2-, -SO2- or SO3-; Y is MeX- or -H; Me is a metal or ammonium and n is 1-18. The monomers may be styrene, a -methyl-styrene, vinyl toluene, chlorostyrenes, ethyl acrylate, acrylic acid, acrylonitrile, vinyl chloride or fluoride, vinylidene chloride; methacrylic esters or nitrile, vinylcarbazole, vinylpyrrolidone, isoprene, chloroprene, butadiene, dichlorobutadiene, divinyl-benzene and vinyl esters or ethers, or a mixture of monomers may be used, e.g. styrene/acrylonitrile or butadiene, styrene/acrylonitrile/vinyl carbazole, or ethyl acrylate/acrylic acid. The emulsifier may be oligomers of styrene, a -methystyrene or vinyl toluene. The catalyst exemplified is potassium persulphate, but may be organic or inorganic radical-forming compounds e.g. peracetic acid, azodiisobutyramide, hydrogen peroxide, persulphates or redox systems. The polymerization may be batchwise or continuous. In an example polystyrene was formed into sheets.

    Continuous production of finely particled expandable styrene polymers
    4.
    发明专利
    Continuous production of finely particled expandable styrene polymers 未知

    公开(公告)号：GB1048243A

    公开(公告)日：1966-11-16

    申请号：GB3321963

    申请日：1963-08-22

    Applicant: BASF AG

    Inventor： OHLINGER HELMUT ,  GUENTHER WOLFGANG ,  SINGLE WINFRIED ,  BUCHHOLZ KARL ,  WILD HANS

    IPC: C08F279/02 ,  C08J9/16

    Abstract: Finely particled expandable styrene polymers are manufactured by a process wherein styrene or a mixture of monomers comprising styrene and one or more a -ethylenically unsaturated compounds which can be copolymerized with styrene, and an organic compound which is liquid or gaseous at standard pressure and temperature which does not dissolve or only swells the styrene polymer obtained by polymerization of styrene or the said mixture of monomers and which has a boiling point lower than the softening point of the styrene polymer, is continuously introduced at the top of a pressure vessel having a diameter less than its height, the styrene or the said mixture of monomers is polymerized with the temperature at the top of the pressure vessel being between 70 DEG C. and 130 DEG C. and at the bottom between 170 DEG C. and 230 DEG C. and the pressure in the pressure vessel being more than the vapour pressure of the organic compound and the monomers at the temperature prevailing at the bottom of the vessel, the composition comprising styrene polymer and organic compound is continually discharged at the bottom of the pressure vessel at a rate equivalent to that at which the monomers and organic compound are supplied at the top of the pressure vessel, and the composition is cooled to 20 DEG C. to 65 DEG C. and then reduced in size. The mixture of monomers should contain at least 50% by weight of styrene. A polymer of ethylenically unsaturated monomeric polymerizable compounds may also be added to the monomer mixture. In general the expanding agents have boiling points greater than - 45 DEG C., e.g. n-pentane, heptane, trichlorofluoroethane and trifluoro-1,1,2-trichloroethane. The ratio of diameter to height of the polymerization vessel may be between 1:100 and 1:5.

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