Rigid foams prepared from treated toluene diisocyanate residue

Details Rigid foams prepared from treated toluene diisocyanate residue Rigid foams prepared from treated toluene diisocyanate residue

1988-12-22

1990-02-27

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521170, 521174, 528 73, 528 76, 528 85, 560330, 560331, 560352, 560353, C08G 1814

Patent

active

049047043

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

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