Rigid foams prepared from treated toluene diisocyanate residue.

摘要

A method of treating toluene diisocyanate distillation residues comprising reacting the residues with at least 0.5 equivalents, based on hydrolyzable chloride concentration of the residues, of an epoxy compound at a temperature of from 155 to 220 DEG C to produce a treated distillation residue having a hydrolyzable chloride level of less than 800 parts per million (ppm) is taught. The product of the method is useful, for instance, in producing rigid foams with low K Factors.