Abstract: A prepolymer composition for producing polyurethane insulating foams with fire-retardant properties from pressure tanks which consists of a prepolymer component with at least one PU prepolymer with a content of NCO groups of 4 to 20 wt % and usual additives, as well as a propellant component, wherein the prepolymer component is substantially halogenfree and has 5 to 40 wt %, based on the prepolymer component, of softening phosphates and/or phosphonates with the formulae O═P(OR3 and O═P(OR)2R.

Abstract: A prepolymer composition for producing polyurethane insulating foams from pressure tanks which consists of a prepolymer component with at least one PU prepolymer with a content of NCO groups of 4 to 20 wt % and usual additives, as well as a propellant component, wherein a polyisocyanate with a content of less than 2 wt %, based on the prepolymer component, of monomeric isocyanate is used.

Abstract: A prepolymer composition for producing polyurethane insulating foams with fire-retardant properties from pressure tanks which consists of a prepolymer component with at least one PU prepolymer with a content of NCO groups of 4 to 20 wt % and usual additives, as well as a propellant component, wherein the prepolymer component is substantially halogen-free and has 5 to 40 wt %, based on the prepolymer component, of softening phosphates and/or phosphonates with the formulae O═P(OR)3 and O═P(OR)2R.

Abstract: The invention relates to a prepolymer composition, in particular for producing insulating foams, based on a polyisocyanate with a functionality of at least 2 and a polyol with at least two OH groups in the molecule, the prepolymer having an isocy-anate content of 6 to 20 wt % and the composition containing usual additives and a propellant gas component which is liquid under pressure, and the prepolymer com-position containing at least 18 wt % of propellant gas based on the weight of the composition, said propellant gas component being present in the form of a propellant phase emulsified in the prepolymer composition alongside the moiety dissolved in the prepolymer composition.

Abstract: A prepolymer composition for producing polyurethane insulating foams from pressure tanks which consists of a prepolymer component with at least one PU prepolymer with a content of NCO groups of 4 to 20 wt % and usual additives, as well as a propellant component, with a content of 0.01 to 2 wt %, based on the prepolymer component, of polybutadiene.