Aromatic polyester polycarbonates from polyols derived from recy

Details Aromatic polyester polycarbonates from polyols derived from recy Aromatic polyester polycarbonates from polyols derived from recy

1983-05-05

1984-08-28

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

260463, 521173, 528271, 528272, 528361, 528370, 528371, 528405, C08G 1814

Patent

active

044684835

ABSTRACT:
A novel class of aromatic polyester polycarbonates is described. The polycarbonates are made by reacting an alkylene carbonate with an aromatic polyester polyol over a polycarbonate formation catalyst such as potassium stannate. In turn, the polyol is made by esterifying a dibasic acid waste stream with an alkylene glycol to produce a polyester polyol which is subsequently used to transesterify recycled polyethylene terephthalate.

REFERENCES:
patent: 3248414 (1966-04-01), Stevens
patent: 4267120 (1981-05-01), Cuscurida et al.
patent: 4374961 (1983-02-01), Kudo et al.

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