Distilled products of polyethylene terephthalate polymers and polycarboxylic acid-containing polyols and polymeric foams obtained therefrom

摘要

A storage stable polyester polyol mixture is prepared by (a) digesting polyethylene terephthalate with a digesting medium comprising a polycarboxylic acid component-containing polyol derived from a digesting polycarboxylic acid component and a digesting polyol component to form a digested polyol mixture and liberate ethylene glycol from said polyethylene terephthalate, and (b) distilling from said digested polyol mixture the amount of liberated ethylene glycol sufficient for improved storage stability of the mixture. The polyester polyol mixture is useful in the preparation of cellular foam materials, particularly polyisocyanurate and polyurethane foams.