Liquid terephthalic ester polyols and polyisocyanurate foams the

Details Liquid terephthalic ester polyols and polyisocyanurate foams the Liquid terephthalic ester polyols and polyisocyanurate foams the

1983-11-18

1984-09-04

Cockeram, Herbert S.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 48, 521 485, 521172, 521175, 521902, 252182, 528 83, 528 84, C08G 1814, C08G 1800

Patent

active

044698240

ABSTRACT:
Terephthalic esters may be made to remain in a liquid form by reacting recycled or scrap polyethylene terephthalate (PET) with diethylene glycol and one or more oxyalkylene glycols and stripping out some of the ethylene glycol present. The mole ratio of glycols to scrap PET should also be greater than 1.2:1. This process keeps any diesters from separating out of the solution as solids. These liquid terephthalic esters are useful as polyol extenders in rigid polyurethane foams and as the sole polyol component in polyisocyanurate foams.

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