Purification/isolation of isocyanate condensates

Details Purification/isolation of isocyanate condensates Purification/isolation of isocyanate condensates

1988-09-26

1989-10-03

Welsh, Maurice J.

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

Synthetic resins

From reactant having at least one -n=c=x group as well as...

528 68, 528483, 528490, 564 38, 560 26, 560115, 560158, 525452, 525453, 525459, 525460, C08G 1882

Patent

active

048718289

ABSTRACT:
Polyisocyanates containing only trace amounts of free aromatic diisocyanates are recovered by purifying and isolating an isocyanate condensate containing free NCO groups from an impure admixture thereof, said isocyanate condensate impure admixture having been prepared by reacting a stoichiometric excess of an aromatic di- or polyisocyanate with a reactant compound containing at least two functional groups which are reactive with NCO groups, and such purification/isolation entailing extracting unreacted excess di- or polyisocyanate from said impure admixture with an inert gas, e.g., carbon dioxide, in either the liquid or supercritical state.

REFERENCES:
patent: 4649162 (1987-03-01), Roche et al.

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