Use of polyethylene terephthalate liquid waste streams containing glycols as rigid polyol extenders

摘要

A method for using polyethylene terephthalate liquid waste streams which contain mono- and polyethylene glycols as polyol extenders in the manufacture of rigid foam is described. Extenders such as this cut down on the polyol expense in rigid foams with no decrease in quality. They are useful in rigid polyurethane and rigid polyisocyanurate foam production.