Liquid terephthalic ester polyols

Details Liquid terephthalic ester polyols Liquid terephthalic ester polyols

C - Chemistry, Metallurgy

07

C

400/102, 403/13,

C07C 69/82 (2006.01) C08G 18/42 (2006.01) C08G 63/672 (2006.01)

Patent

CA 1236847

LIQUID TEREPHTHALIC ESTER POLYOLS (D#80,319-F) Terephthalic esters may be made to remain in a liq- uid form by reacting recycled or scrap polyethylene tere- phthalate (PET) with diethylene glycol and one or more oxy- alkylene 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 ex- tenders in rigid polyurethane foams and as the sole polyol component in polyisocyanurate foams.

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