A process for producing a formbestaendigen plastic foam, in particular of a flame-proof plastic foam formbestaendigen

摘要

This invention relates to polyurethane-modified polyisocyanurate foam having excellent flame-resistivity and non- combustibility, which is prepared from (A) at least one aromatic polyisocyanates having no ortho- substituent, (B) at least one polyhydroxyl and/or polycarboxyl compound, (C) at least one foaming agent and (D) at least one catalyst used for the trimerization of isocyanate groups. The proportions of these components satisfy the relationships: (1) the equivalent ratio, Ae/(Be+Ce+De), is more than two, and (2) the weight ratio, Bw/Aw is less than 0.4 and more than zero, wherein A, B, C and D represent the above mentioned components respectively, e represents the number of chemical equivalents, w represents the weight of the components and the factors and Ce and De are eliminated from the relationships when components C and D do not react with the component A.