Process and apparatus for reclaiming polyurethanes

Details Process and apparatus for reclaiming polyurethanes Process and apparatus for reclaiming polyurethanes

1980-12-19

1982-07-13

Briggs, Sr., Wilbert J.

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

Synthetic resins

Process of treating scrap or waste product containing solid...

525453, 528 67, 422184, 568700, 521 49, C08J 300, C08J 1104

Patent

active

043393586

ABSTRACT:
A process and apparatus are provided for the treatment of waste polyurethane particles by alcoholysis or acidolysis. The particles are treated with a solvent at a reaction temperature within the range of 120.degree. C. to 200.degree. C. while being subjected to comminution until the particles are liquified. The resultant liquified product may be converted to a polyurethane by treatment with a polyisocyanate. An apparatus for conducting this process includes shaped blades and fixed heated elements for exerting strong shear forces on the particles or fragments of polyurethane.

REFERENCES:
patent: 2937151 (1960-05-01), Broeck et al.
patent: 3123577 (1964-03-01), Heiss
patent: 4014809 (1977-03-01), Kondo et al.
patent: 4267078 (1981-05-01), Lidy et al.

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