Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Process of treating scrap or waste product containing solid...
Patent
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.
Dorner Karl-Heinz
Liman Ulrich
Meckel Walter
Munzmay Thomas
Nefzger Hartmut
Bayer Aktiengesellschaft
Gil Joseph C.
Truong Duc
Whalen Lyndanne M.
LandOfFree
Process for the production of hydroxyfunctional compounds from ( 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 the production of hydroxyfunctional compounds from (, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the production of hydroxyfunctional compounds from ( will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-938072