US Patent 7868125 Production of non-solid-stated polyester particles having solid-stated properties

Patent 7868125 was granted and assigned to Eastman Chemical Company on January, 2011 by the United States Patent and Trademark Office.

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Patent

Patent attributes

Current Assignee

Eastman Chemical Company

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

78681250

Patent Inventor Names

Tommy Ray Maddox, II0

Stephen Weinhold0

Steven Lee Stafford0

Steven Paul Bellner0

Alan George Wonders0

Bruce Roger DeBruin0

John Alan Wabshall, Jr.0

John Guy Franjione0

...

Date of Patent

January 11, 2011

Patent Application Number

123944780

Date Filed

February 27, 2009

Patent Primary Examiner

‌

Terressa M. Boykin

Patent abstract

A process for producing non-solid-stated polyester polymer particles having one or more properties similar to polyester polymer particles that have undergone solid-state processing. In one embodiment, the process comprises (a) forming polyester polymer particles from a polyester polymer melt; (b) quenching at least a portion of the particles, (c) drying at least a portion of the particles, (d) crystallizing at least a portion of the particles, (e) annealing at least a portion of the particles. At all points during and between steps (b) through (e), the average bulk temperature of the particles is maintained above 165° C.

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