Abstract: Disclosed herein is a process for producing polyurethanes including mixing (a) aromatic polyisocyanate with (b) polymeric compounds having isocyanate-reactive groups, (c) optionally chain extender and/or crosslinking agent, (d) catalyst, (e) 0.1% to 5% by weight, based on the total weight of the components (a) to (f), of at least one cyclic urea structure of general formula 1 where —X— represents a substituted or unsubstituted, 3-membered radical and R represents a radical (f) optionally blowing agent and (g) optionally additives to afford a reaction mixture and reacting the reaction mixture to afford the polyurethane. Further disclosed herein are a polyurethane obtainable by such a process and a method of using such a polyurethane foam for producing cushions, seat pads and mattresses.

Abstract: A ceramic which can be obtained from a composite of at least two outer pre-ceramic paper and/or cardboard structures (1, 2) as cover layers and at least one inner pre-ceramic paper and/or cardboard structure (3, 4) as an intermediate layer and spacer for the outer pre-ceramic paper and/or cardboard structures (1, 2). The inner pre-ceramic paper and/or cardboard structure (3, 4) in the composite is connected on the upper and/or lower face over the entire surface to at least one further pre-ceramic paper- and/or cardboard structure (1, 2) and the inner pre-ceramic paper- and/or cardboard structure (3, 4) has a plurality of surface cut-outs (5, 6).

Abstract: The invention relates to a method for producing a wear-resistant reaction-bounded ceramic filtering membrane, during which a porous metallic or non-metallic support for producing a green body is provided with a suspension. This suspension is obtained from a dispersant and from a dispersed phase, and this dispersed phase can be obtained from at least one ceramic raw material from the group of metal nitrides and, optionally, from at least one other ceramic raw material. The invention provides that the green body produced in this manner is fired at a temperature ranging from 700° C. to 1250° C. under atmospheric pressure in a oxidizing atmosphere in order to obtain a phase change of at least the ceramic raw material.

Abstract: A filter device (1) is provided for microfiltration and/or ultrafiltration, preferably for varnishes, such as cathodic dipping varnishes, for connection to a conduit, having a pressure housing (2) and at least one ceramic membrane filter element (3) located in the pressure housing (2). In order to make a filter device of the previously mentioned type available which is also suitable for the recycling of varnishes, particularly cathodic dipping varnishes, the ceramic membrane filter element (3) is electrically connected with at least one electrical conductor (5) and is grounded via the electrical conductor (5).

Abstract: A filter device (1) is provided for microfiltration and/or ultrafiltration, preferably for varnishes, such as cathodic dipping varnishes, for connection to a conduit, having a pressure housing (2) and at least one ceramic membrane filter element (3) located in the pressure housing (2). In order to make a filter device of the previously mentioned type available which is also suitable for the recycling of varnishes, particularly cathodic dipping varnishes, the ceramic membrane filter element (3) is electrically connected with at least one electrical conductor (5) and is grounded via the electrical conductor (5).