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AssigneeE. I. Du Pont de Nemours and Company
InventorsJiwen F. Duan, Donald E. Putzig, Frederick K. Mallon, Timothy M. Davis
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A composition that can be used as catalyst is disclosed. The composition comprises, or is produced by combining, (A) a titanium compound; (B) either (i) a complexing agent, (ii) a combination of a complexing agent, hypophosphorous acid or a salt thereof, and optionally a solvent, a zirconium compound, or both, (iii) combinations thereof; (C) a phosphorus compound; and optionally a solvent. Also disclosed is a process that can be used for producing a polyester. The process comprises contacting, in the presence of an esterification or transesterification or polycondensation catalyst composition and a phosphorus compound, a carbonyl compound and an alcohol under a condition suitable for esterification, transesterification, or polymerization. Further disclosed is a process to make polyester with reduced insoluble particles or solids using a phosphorus compound other than the commonly used phosphoric acid.
A composition comprising or produced by combining (A) a titanium compound;
A process for producing polyester containing reduced insoluble particles or solids comprising contacting, in the presence of a metal or metal compound and a phosphorus compound, a carbonyl compound with an alcohol wherein said catalyst is a metal-containing compound and said phosphorus compound is selected from the group consisting of a polyphosphoric acid or a salt thereof, a phosphonate ester, a pyrophosphoric acid or salt thereof, a pyrophosphorous acid or salt thereof, and combinations of two or more thereof.
Dependencies are inferred from the claim text.