[ENGELHARDT ULRICH, ULRICH ENGELHARDT, REIZLEIN KARL, KARL REIZLEIN, WANGEMANN KLAUS, SINGER ROLF-JUERGEN, ROLF-JUERGEN SINGER, HORSTMANN HEINZ-OTTO, HEINZ-OTTO HORSTMANN, KLAUS WANGEMANN, WIRTH WOLFGANG, WOLFGANG WIRTH, GUENTHER BOEHMKE, BARTKOWIAK FRANK, FRANK BARTKOWIAK, SCHULZE HANS, HANS SCHULZE, BOEHMKE GUENTHER]

[Schulze Hans(Cologne,DEX), Walz Klaus(Leverkusen,DEX), Bartkowiak Frank(Cologne,DEX), Jakobs Karlhans(Bergisch Gladbach,DEX)] Levelling agents containing I. ethers of the general formula ##STR1## in which R.sub.1 denotes alkyl, alkenyl, cycloalkyl, aryl or aralkyl, R.sub.2 denotes hydrogen or methyl, x denotes 1, 2 or 3 and y denotes 0 to 7, and II. emulsifiers and, if desired, III. carriers for the dyeing of polyesters are used for the high-temperature dyeing of polyester fibres and polyester-containing materials.

[HORSTMANN HEINZ-OTTO, ENGELHARDT ULRICH, REIZLEIN KARL, SINGER ROLF-JUERGEN, WANGERMANN KLAUS, WIRTH WOLFGANG, BARTKOWIAK FRANK, BOEHMKE GUENTHER, SCHULZE HANS]

[Bartkowiak, Frank, Dr., Schulze, Hans, Dr., Schröer, Wolf-Dieter, Dr., Boehmke, Günther, Dr., Jakobs, Karlhans, Dipl.-Ing., Schössler, Willi, Dr.]

[BARTKOWIAK FRANK, SCHULZE HANS, SCHROER WOLF-DIETER, BOEHMKE GUNTHER, JAKOBS KARLHANS, SCHOSSLER WILLI]

[HORSTMANN HEINZ-OTTO, ENGELHARDT ULRICH, REIZLEIN KARL, SINGER ROLF-JUERGEN, WANGERMANN KLAUS, WIRTH WOLFGANG, BARTKOWIAK FRANK, BOEHMKE GUENTHER, SCHULZE HANS]

[Horstmann, Heinz-Otto, Dr., Engelhardt, Ulrich, Dr., Reizlein, Karl, Dr., Singer, Rolf-Jürgen, Dr., Wangermann, Klaus, Dr., Wirth, Wolfgang, Dr., Bartkowiak, Frank, Dr., Boehmke, Günther, Dr., Schulze, Hans, Dr.] DE,51368 Leverkusen,;

[Schulze, Hans, Dr., Walz, Klaus, Dr., Bartkowiak, Frank, Dr., Jakobs, Karlhans, Dipl.-Ing.] DE,51368 Leverkusen,;

[HORSTMANN HEINZ-OTTO DR, ENGELHARDT ULRICH DR, REIZLEIN KARL DR, SINGER ROLF-JURGEN DR, WANGERMANN KLAUS DR, WIRTH WOLFGANG DR, BARTKOWIAK FRANK DR, BOEHMKE GUNTHER DR, SCHULZE HANS DR]

[McMillan April D.(Knoxville,TN), Modine Frank A.(Oak Ridge,TN), Lauf Robert J.(Oak Ridge,TN), Alim Mohammad A.(Medina,OH), Mahan Gerald D.(Oak Ridge,TN), Bartkowiak Miroslaw(Oak Ridge,TN)] A varistor includes a Bi-free, essentially homogeneous sintered body of a ceramic composition including, expressed as nominal weight %, 0.2-4.0% oxide of at least one rare earth element, 0.5-4.0% Co.sub.3 O.sub.4, 0.05-0.4% K.sub.2 O, 0.05-0.2% Cr.sub.2 O.sub.3, 0-0.2% CaO, 0.00005-0.01% Al.sub.2 O.sub.3, 0-2% MnO, 0-0.05% MgO, 0-0.5% TiO.sub.3, 0-0.2% SnO.sub.2, 0-0.02% B.sub.2 O.sub.3, balance ZnO.