Patent ID: 6136869
Filing Date: 2000-10-24
Classification: C07C,C08J,Y02W

Abstract:
A process for recovering suitable polyester feedstock material from recycled polyester comprising the steps of:a) depolymerizing said recycle polyester into a product having ester monomers, glycols and half-esters by contacting said recycled polyester with a lower alkyl alcohol selected from the group consisting of methanol, ethanol, propanol and mixtures thereof;b) separating said ester monomers, glycols and half-esters from secondary materials in said depolymerized product by rectifying said product but otherwise said ester monomers, glycols and half-esters are substantially free of subsequent purification and separation of said glycols from said ester monomers and half-esters; andc) mixing said product ester monomers, glycols and half-esters with one or more monomers under transesterification conditions to produce a low molecular weight polyester.