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    3.
    发明专利
    未知

    公开(公告)号：DE1181699B

    公开(公告)日：1964-11-19

    申请号：DEB0055505

    申请日：1959-11-12

    Applicant: BASF AG

    Inventor： POHLEMANN DR HEINZ ,  BURGER DR HEINZ ,  LEICHTLE DR OTTO

    IPC: C07D271/10 ,  C07D271/113 ,  C08F2/38

    Abstract: Ethylenically unsaturated polymerizable monomers are stabilized against unwanted polymerization by the addition of from about 0.0001% to 2% by weight of a substituted oxadiazole of the general formula or or a mixture of such oxadiazoles, wherein each of x1 to x5 represents a halogen atom or one of the radicals -N(R)2, -OR or -R, and R represents a hydrogen atom or an alkyl, cycloalkyl, aralkyl or aryl radical or an aryl radical which is substituted by nitro groups, or in which the substituents x2 and x3 together represent a methylenedioxy group. Specified monomers which are stabilized are vinyl chloride, vinylidene chloride, 2-chloro-buta-1,3-diene, styrene, a -methyl styrene, vinyl toluenes, vinyl pyridines, vinyl imidazoles, vinyl pyrrolidone, vinyl carbazole, acrylic and methacrylic acids and their esters with linear, branched and cycloaliphatic alcohols containing 1-20 carbon atoms, acrylamide, methacrylamide, acrylonitrile, vinyl esters of carboxylic acids containing 2-20 carbon atoms, divinyl ether, tert-butyl vinyl ether, methyl vinyl ketone, tert-butyl vinyl ketone, and vinyl sulphonic and vinyl phosphonic acids and their salts. The monomers may be diluted with solvents such as cyclohexane, octane, benzene and toluene. Numerous examples of suitable oxadiazoles are given. Examples are given of the stabilization of monomers. Example (3) describes polymerization of the monomers.

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