Removal of unreacted diisocyanate from polyurethane prepolymers

Details Removal of unreacted diisocyanate from polyurethane prepolymers Removal of unreacted diisocyanate from polyurethane prepolymers

1982-04-30

1983-05-24

Welsh, Maurice J.

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

Synthetic resins

Treating polymer containing material or treating a solid...

260453SP, 560 25, 560115, 560158, 528494, 528497, 528501, C08G 1882

Patent

active

043851711

ABSTRACT:
Unreacted diisocyanate is removed from a polyurethane prepolymer reaction product mixture by co-distillation of the unreacted diisocyanate with a compound which is at least partially miscible with the prepolymer and which boils at a temperature greater than the boiling point of the diisocyanate. A highly efficient removal rate is achieved in that the concentration of unreacted diisocyanate remaining in the reaction product mixture is generally less than about 0.1 percent, and in many cases less than about 0.05 percent, based on the weight of the prepolymer.

REFERENCES:
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patent: 3817933 (1974-06-01), Niederdellmann et al.
patent: 3883577 (1975-05-01), Rabizzoni et al.
patent: 4061662 (1977-12-01), Marans et al.
patent: 4169175 (1979-09-01), Marans et al.

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