The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 15, 1996
Filed:
Nov. 07, 1994
George C Zima, Kingsport, TN (US);
Gary P Lutz, Church Hill, TN (US);
Gary W McChesney, Batesville, AR (US);
T Hugh Williams, Fall Branch, TN (US);
Eastman Chemical Company, Kingsport, TN (US);
Abstract
This invention relates to a process for recycling waste material selected from amino-carboxylic acid oligomers or polymers and amido-carboxylic acid oligomers or polymers into amido-carboxylic acids. A mixture containing water, an oligomeric or polymeric waste material, and a carboxylic acid is heated. The mixture is cooled to obtain a two phase system containing an aqueous phase and an organic phase which are separated. Carboxylic acids, unreacted starting materials, and the monomeric amido-carboxylic acid product are distilled from the organic phase. The remaining solid residue composed of high boiling oligomeric amino-carboxylic acids is recycled into Step (A).