Polyamines and processes for the production of such polyamines a

Details Polyamines and processes for the production of such polyamines a Polyamines and processes for the production of such polyamines a

1982-08-30

1983-11-29

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521163, 528 65, 528 66, 528 68, C08G 1814

Patent

active

044181604

ABSTRACT:
A compound having a terminal isocyanate group is hydrolyzed to produce a polyamine having a urethane and/or a urea and/or a biuret group. More particularly, a carbamate is made by mixing an isocyanate prepolymer having urethane and/or urea and/or biuret groups present with aqueous base solutions at a temperature of from 0.degree. to 0.degree. C. and in quantities such that the equivalent ratio of hydroxyl to isocyanate groups is between from 0,3:1 to .gtoreq.1,01 to 1. The carbamate is then treated with an acid ion exchanger to form an amine. The amine is then removed from any other material which may be present. A preferred polyamine thus-produced corresponds to the general formula: ##STR1## in which each R radical may represent a divalent straight or branched- chain aliphatic radical; a divalent cycloaliphatic radical; a 4,4'- and/or a 2,4'-dicyclohexylmethane radical; or a 2,4- and/or 2,6-methyl cyclohexane radical. Such an amine may be reacted with a polyisocyanate and optionally with other known additives to form a polyurethane plastic or foam.

REFERENCES:
patent: 3955774 (1976-05-01), Kalopissis et al.
patent: 4303780 (1981-12-01), Bellos
patent: 4324739 (1982-04-01), Zondlen et al.
Sidgwick, Sidgwick's Organic Chemistry of Nitrogen, 3rd Edition, pp. 236-237 (1966).
"Spectrophotometric Determination of Aliphatic Isocyanates in the Occupational Atmosphere", Analyst, Oct., 1979, vol. 104, pp. 928-936.

Affiliated with

Also associated with

Rating

Polyamines and processes for the production of such polyamines a does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Polyamines and processes for the production of such polyamines a, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polyamines and processes for the production of such polyamines a will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-608019