Polyisocyanate compositions and their use in the manufacture of polymeric foams.

摘要

The invention relates to polyisocyanate compositions comprising compounds of the general formula Tm(R)n wherein T represents a chain of more than 70 atoms, m represents an integer of at least 1, R represents an isocyanate group containing residue and n is an integer of at least 2, at least one of the residues represented by R containing at least two isocyanate groups separated one from another by a chain of from 5 to 30 atoms and the sum of the residues represented by R constituting less than 50 % of the total molecule on a weight basis. The invention also relates to a method for the preparation of flexible polymeric foams using such polyisocyanate compositions.