Abstract: Refrigeration units having internal parts containing a rigid polyurethane foam formed without the use of perhalogenated fluoro-chlorohydrocarbons are produced by applying a coating to the internal walls of the part in which back-foaming will take place, pouring a foam forming reaction mixture into the cavity of the part in which the internal walls have been coated and allowing the foam to form and set. The coating applied to the internal walls of the part in which back foaming is to be carried out is selected from one-component chemically cross-linking lacquers, two-component chemically cross-linking lacquers and lacquers based on aqueous polyurethane dispersions. The foam forming mixture generally includes a polyisocyanate, a polyisocyanate-reactive compound and a blowing agent. The blowing agent must include a partially halogenated hydrocarbon having at least one carbon-hydrogen bond and a boiling point in the range of from about -50.degree. to about 50.degree. C.

Abstract: The preparation and use of polyurethane-based hot melt adhesives which are cross-linked under the influence of heat comprising reacting(a) a polyisocyanate component containing at least one organic polyisocyanate with(b) a polyol component containing(b1) at least one organic polyhydroxyl compound having a hydroxyl number of 50 to 400 and optionally(b2) at least one organic polyhydroxyl compound having a hydroxyl number above 400 used in a quantity of 0 to 100 hydroxyl equivalents percent, based on component (b1), optionally with the addition of(c) auxiliary agents and additives conventionally used in polyurethane chemistry and/or the technology of adhesives is disclosed.The reaction is characterized in that the equivalent ratio of isocynate groups of component (a) to all the isocyanate reactive groups present in component (b) is from 1:1 to 1.

Abstract: Novel, finely divided, redispersible dispersions of high melting polyesters in low melting polyhydroxyl compounds are disclosed. Disclosed also is a process for their preparation and their use as polyol components containing fillers in the production of cellular or non-cellular polyurethanes.