Donald C Ellison

US Patent:

20060287471, Dec 21, 2006

Filed:

Jun 16, 2005

Appl. No.:

11/154146

Inventors:

Benjamin Schreiber - Johnson City TN, US
Eric Olsen - Kingsport TN, US
Steven Stafford - Gray TN, US
Jack Hensley - Kingsport TN, US
Donald Ellison - Kingsport TN, US

International Classification:

C08G 63/02

US Classification:

528272000

Abstract:

An acetaldehyde screening method is developed by feeding solid polymer sample particles having a free acetaldehyde (“AA”) content of 2 ppm or less, melting at least a portion of the sample particles to obtain a polymer sample having a heat history, and thereafter measuring the amount of acetaldehyde present in the polymer sample having the heat history. There is also provided a screening method in which the quantity of free or residual AA in or on a polymer sample is measured to obtain a first value AAf, the sample is melted, and thereafter the amount of AA generated upon remelting the polymer is measured to obtain a second value AAg.