Process for converting the decomposition products of polyurethan

Details Process for converting the decomposition products of polyurethan Process for converting the decomposition products of polyurethan

1976-07-09

1978-08-29

DeBenedictis, Sr., Thomas

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 334UR, 260 336UB, 260 338UB, 521167, 528 78, C08J 1100, C08G 1800

Patent

active

041102665

ABSTRACT:
Decomposing polyurethane foams and converting the depolymerized reaction product containing amines, both aromatic and aliphatic, into polyols suitable for reaction with polyisocyanate to produce fresh polyurethane foam, by first reacting polyurethane foam with ammonia or an amine such as diethylene triamine or ethanolamine, or with a polyol such as polypropylene glycol, and reacting the resulting decomposition product containing a mixture of polyols, ureas, and amines, which can include primary and secondary amines, with an alkylene oxide such as ethylene oxide or propylene oxide, at elevated temperature, preferably about 120.degree. to about 140.degree. C., in an autoclave under autogenous pressure, to convert such amines to polyols. The resulting reaction mixture containing polyol fragments from the decomposition of the polyurethane, and additional polyols from the reaction with alkylene oxide can be incorporated with fresh polyurethane reactants, including polyisocyanate, or additional polyol and polyisocyanate, thus permitting efficient recovery and re-use of otherwise useless scrap polyurethane materials.

REFERENCES:
patent: 3708440 (1973-01-01), Frulla et al.
patent: 3719615 (1973-03-01), Buisson et al.
patent: 3763111 (1973-10-01), Fijal

Affiliated with

Also associated with

Rating

Process for converting the decomposition products of polyurethan does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for converting the decomposition products of polyurethan, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for converting the decomposition products of polyurethan will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1632164