Polyamines and a process for their production from polyisocyanat

Details Polyamines and a process for their production from polyisocyanat Polyamines and a process for their production from polyisocyanat

1986-08-11

1988-02-09

Welsh, Maurice J.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525453, 525460, 528 44, 528 59, 560 25, 560 26, 560115, 560158, C08G 1883

Patent

active

047242523

ABSTRACT:
Polyamines containing aromatically bound primary amino groups are prepared in a single stage process by hydrolyzing an isocyanate in the presence of a compound containing an amidine and/or guanidine group and a water-miscible, aprotic-dipolar solvent. This hydrolysis is carried out at from 20.degree. to 210.degree. C. with the reactants being in substantially homogeneous phase. The isocyanate starting material contains aromatically bound NCO groups and has NCO content of from 0.5 to 40 wt. %. The compound containing amidine and/or guanidine groups functions as a catalyst and is used in a quantity of at least 0.001 parts by weight for every 100 parts by weight of isocyanate. The water-miscible solvent is used in a quantity of at least 10 parts by weight for every 100 parts by weight of polyisocyanate. The polyamines thus-produced are particularly useful in the production of polyurethanes.

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