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    Process for producing aqueous N-methylmorpholine-N-oxide solutions
    4.
    发明授权
    Process for producing aqueous N-methylmorpholine-N-oxide solutions 失效
    制备N-甲基吗啉-N-氧化物水溶液的方法

    公开(公告)号：US4748241A

    公开(公告)日：1988-05-31

    申请号：US11526

    申请日：1987-02-06

    申请人： Heinz Scholten ,  Klaus Rindtorff

    发明人： Heinz Scholten ,  Klaus Rindtorff

    IPC分类号： C07D295/22 ,  C07D295/24

    CPC分类号： C07D295/24

    摘要： N-methylmorpholine-N-oxide is prepared by reacting the azeotrope of methylmorpholine and water with an aqueous solution of hydrogen peroxide. The reaction solution product is thereupon concentrated to the desired content in N-methylmorpholine-N-oxide.

    摘要翻译： 通过使甲基吗啉与水的共沸物与过氧化氢水溶液反应制备N-甲基吗啉-N-氧化物。 然后将反应溶液产物浓缩至N-甲基吗啉-N-氧化物中所需的含量。

    Method for producing polylaurolactam powder compositions for the coating of metals at high temperatues
    9.
    发明授权
    Method for producing polylaurolactam powder compositions for the coating of metals at high temperatues 失效

    公开(公告)号：US4195162A

    公开(公告)日：1980-03-25

    申请号：US924355

    申请日：1978-07-13

    申请人： Rainer Feldmann ,  Hans-Joachim Panoch ,  Heinz Scholten ,  Roland Feinauer

    发明人： Rainer Feldmann ,  Hans-Joachim Panoch ,  Heinz Scholten ,  Roland Feinauer

    IPC分类号： C08G69/46 ,  C08J3/12 ,  C08L77/02 ,  C08G69/16

    CPC分类号： C08J3/12 ,  C08G69/46 ,  C08L77/02 ,  C08J2377/02

    摘要： Polylaurolactam powder coating compositions for the coating of metals at high temperatures are obtained by grinding low molecular weight and brittle polylaurolactam with subsequent condensation by heating of the powder to temperatures of below its melting point.A. For the production of pigment free polylaurolactam powders, the low molecular weight granules are ground at temperatures of between 0.degree. and 45.degree. C. which have a relative viscosity of between 1.25 and 1.45 (measured in a 0.5 percent mecresol solution at 25.degree. C.) and have been produced by the polymerization of laurolactam in the presence of 2-10 percent by weight of water, 0.3-0.7 percent by weight of phosphoric acid at temperatures of between 265.degree. and 300.degree. C. in the absence of chain stabilizers under internal pressure, with subsequent granulating, and extraction between 25.degree. and 70.degree. C. with methanol or ethanol. The subsequent condensation is conducted at temperatures of between 140.degree. C. and below the melting point of the polyamide to relative viscosity value of between 1.55 and 1.65; and finally the powders obtained are brought to a particle size distribution of between greater than 60 and less than 350 microns.B. For the production of pigmented polylaurolactam powders, the low molecular weight granules are treated at temperatures of between 110.degree. and 140.degree. C. and pressures of between 5 and 8 bars with the addition of pigments in primary aliphatic alcohols having 1-3 carbon atoms, cyclohexanol, or ethylbutanol, these granules having a relative viscosity of between 1.25 and 1.65 and likewise having been obtained by the polymerization of laurolactam in the presence of 2-10 percent by weight of water, 0.3-0.7 percent by weight of phosphoric acid at temperatures of between 265.degree. and 300.degree. C. in the absence of chain stabilizers under internal pressure, with subsequent granulating, and extraction between 25.degree. and 70.degree. C. with methanol or ethanol. The powders are obtained with gradual cooling to room temperature with a minimum of mechanical motion and these powders are dried, optionally screened and, if necessary, the thus-extracted granules or the dried powders are brought to relative viscosity value of between 1.55 and 1.65 by subsequent condensation at temperatures of between 140.degree. C. and below the melting point of the polyamide.