Process for making polyesters containing low concentrations of diethylene glycol
AssigneeEastman Chemical Company
InventorsDavid Taylor Bowers, Ronnie Jay Jones, Michael Duane Cliffton, Joseph Franklin Knight, Donna Rice Quillen
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Abstract
The present invention relates to a process for producing a high molecular weight polyester having less than about 0.5 weight % diethylene glycol comprising adding at least one carbonate compound to the ester exchange reaction product produced from reaction of a glycol component comprising ethylene glycol and an ester component comprising dimethylterephthalate, dimethylnaphthalenedicarboxylate and mixtures thereof wherein said reaction product is formed without a Ti catalyst.
Claims28
A process for producing a high molecular weight polyester having less than about 0.5 weight % diethylene glycol comprising adding at least one carbonate compound to the ester exchange reaction product produced from reaction of a glycol component comprising ethylene glycol and an ester component comprising dimethylterephthalate, dimethylnaphthalenedicarboxylate and mixtures thereof wherein said reaction product is formed without a Ti catalyst.
A process for making polyesters via esterification containing levels of diethylene glycol less than about 1 weight % comprising the steps of suspending finely divided clay in ethylene glycol and adding said clay/ethylene glycol suspension to the esterification step.
Dependencies are inferred from the claim text.