Abstract: The invention proposes the following method of producing reactive melts which are especially useful as hotmelt adhesives:a) suitable meltable hydroxy functional or amino functional polymers or polymer mixes (A) which become liquid at temperatures above 40.degree. C. are inhomogenously mixed withb) powdered, solid, surface desactivated polyisocyanates (B) or a suspension of such polyisocyanates (B) in a low volatility carrier fluid,c) in approximately stoichiometric proportions at a temperature of at least 40.degree. C. in a static mixer so that the resultant mixture of substances exhibits partial areas in which the ratio (1) of polymer (A) to (2) solid isocyanate (B) and desactivating agent (C) is different from the average ratio of these substances or mixtures thereof within the entire mix,d) the inhomogenous mixture is extracted in a form suitable for the intended use and solidified by cooling to below the mixture's softening point.

Abstract: A wall covering material comprising a front, decorative filled cover layer containing textile fibers and a rear foam plastic layer. The foam plastic layer contains flame-retarding additives, is elastic and gas pervious. Furthermore, it contains closed cell inorganic hollow spheres or small balls, which rigidify or stiffen the foam plastic layer, but do not unduly impair its restoring capability and also do not impair the insulation capability, sound absorption capability and flame resistance.

Abstract: In order to incorporate oxygen into waters there is immersed therein at least one container or vessel which contains liquid oxygen. The oxygen is released into the water. The container is formed at least in part of a water soluble material, so that there results automatic release of the oxygen. Hence, oxygen can be introduced into deeper situated layers of the water without otherwise impairing the waters. With this equipment and technique there is avoided the need for complicated installations and there are not issued any emissions.