Use of comminuted melamine-formaldehyde condensate foam or fiber material to produce flame-retardant hard polyurethane foams

摘要

Comminuted melamine-formaldehyde condensate foam or fiber material (I) is used to produce flame-retardant hard polyurethane foams. Independent claims are also included for the following: (1) a process for producing flame-retardant hard polyurethane foams by reacting polyisocyanates with at least one compound containing at least two reactive hydrogen atoms in the presence of water or other blowing agents and other additives, in which (I) is added to the reaction mixture together with at least one flame retardant; (2) a hard polyurethane foam produced by a process as in (1).