Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Process of treating scrap or waste product containing solid...
Patent
1997-07-10
1999-09-07
Niland, Patrick D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Process of treating scrap or waste product containing solid...
C08J 1104
Patent
active
059488280
ABSTRACT:
A process is described for preparing polyols in the form of bifunctional aromatic polyester alcohols from PET wastes and wastes from PET production. The process comprises dissolving the PET wastes in diethylene glycol (DEG), with the ratio of wastes to DEG being selected in such a way that the polyester alcohol obtained after the subsequent transesterification has a hydroxyl number (OHN) greater than 700 mg KOH/g, transesterifying the wastes dissolved in DEG and, if required or if desired, freed of solids, using known transesterification catalysts, with the ethylene glycol (EG) liberated in the process being at least partially distilled off, and distilling off free DEG at a temperature of below 140.degree. C. from the transesterification product at equilibrium until a polyester alcohol having an OHN of 260-500 mg KOH/g is obtained.
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Niland Patrick D.
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