Process for the production of hydroxyfunctional compounds from (

Details Process for the production of hydroxyfunctional compounds from ( Process for the production of hydroxyfunctional compounds from (

1994-02-01

2000-02-01

Truong, Duc

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

Synthetic resins

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

521 405, 521 49, 528 49, 528 52, 528220, 528224, 528229, 528272, C08J 1104

Patent

active

060203862

ABSTRACT:
Hydroxyfunctional compounds suitable for use in the polyisocyanate polyaddition process are obtained from polyurethane and/or polyurethane polyurea waste by decomposition with an alcohol and subsequent reaction of the alcoholysis products to reduce their content of low molecular weight, sterically unhindered aromatic amines. In this process, polyurethane and/or polyurethane polyurea waste is first treated with a low molecular weight diol or polyol at a temperature of from about 160 to 260.degree. C. The resultant alcoholysis product may then either be further heated at a temperature lower than that used in the first step within the ranger of from about 50 to 180.degree. C. or reacted with a dialkyl carbonate and/or 1,3-dicarbonyl compound.

REFERENCES:
patent: 4159972 (1979-07-01), Brasion et al.
patent: 4218543 (1980-08-01), Weber et al.
B. Naber: "Recycling von Polyurethanen (PUR)", Kunststoffrecycling-Tagung der TU Berline Jan. 10, 1991).
W. Thoma and H. Genth Medizin und Chemie 7, 793-801 (1963), Verlag Chemie, Weinheim a.d. Bergstrasse.
H. Glaser in Houben-Weyl, Methoden der Organischen Chemie, Nov., Stuttgart (1957.

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