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US 4,230,819 AGranted
Eliminating acetaldehyde from crystalline polyethylene terephthalate resin
AssigneeThe Goodyear Tire & Rubber Company
InventorsJack D. Hauenstein, Thomas E. Broderick
Life of this patent
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Abstract
The invention relates to the removal of acetaldehyde from crystalline polyethylene terephthalate granules by passing a dry inert gas through a bed of resin at a temperature of 170.degree. C. to 250.degree. C. for a time sufficient to remove the aldehydes.
Claims3
The method of removing acetaldehyde from crystalline polyethylene terephthalate resin which comprises passing a dry inert gas through a bed of said resin at a temperature of from about 170.degree. C. to about 250.degree. C. in an amount sufficient to remove acetaldehyde and other degradation products from said resin.
Dependencies are inferred from the claim text.