Manufacturing of rigid foam using etherified modified aromatic p

Details Manufacturing of rigid foam using etherified modified aromatic p Manufacturing of rigid foam using etherified modified aromatic p

1984-11-05

1986-08-05

Ivy, C. Warren

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 485, 521173, 521902, 560 91, C08G 1842, C08G 1814

Patent

active

046044108

ABSTRACT:
Rigid polyurethane and polyisocyanurate foams are prepared by reacting an excess of an organic polyisocyanate with an etherified modified aromatic polyol. The etherified modified aromatic polyol is prepared by digesting scrap polyalkylene terephthalate polymers with a low molecular weight polyol. The digested polyol is reacted with a low molecular weight polyhydroxy compound containing from about 3 to about 8 hydroxyl groups to form an intermediate product which is alkoxylated with 1 to 4 mols of ethylene oxide and/or propylene oxide to produce a low viscosity etherified modified aromatic polyol which displays excellent stability over long term storage. The etherified modified aromatic polyol is useful in the manufacture of good quality polyurethane and polyisocyanurate foams having improved properties.

REFERENCES:
patent: 4469824 (1984-09-01), Grigsby
patent: 4485196 (1984-11-01), Speranza

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