ALEXANDRIA, Va., May 24 -- Richard Allen Hayes of Brentwood, Tenn., has developed
sulfonated aliphatic-
aromatic copolyesters and shaped articles produced therefrom. According to the U.S.
Patent & Trademark Office: "Sulfonated aliphatic-aromatic copolyesters and articles made therefrom, and processes for producing the sulfonated aliphatic-aromatic copolyesters and articles are provided. Articles that can be made from the sulfonated aliphatic-aromatic copolyesters include films, coatings and laminates. Some of the compositions and articles are biocompostable. The films can further be used to form shaped articles such as sheets, food packaging such as sandwich wraps, thermoformed containers, and coatings for, for example, films and other substrates." An abstract of the invention, released by the Patent Office, said: "The sulfonated aliphatic-aromatic copolyesters are derived from copolyesters produced from aliphatic-aromatic copolyesters formed from an aromatic dicarboxylic acid
component, an aliphatic dicarboxylic acid component, a first glycol component consisting of 1,4-butanediol, a second glycol component, and optionally, a polyfunctional branching agent." The inventors were issued U.S. Patent No. 7,220,815 on May 22. The patent has been assigned to EI du Pont de Nemours & Co., Wilmington, Del. The original application was filed on July 31, 2003, and is available at: http://patft.uspto.gov/netacgi/nph-Parser?Se ct1=PTO1&Sect2=HITOFF&d=PALL&p= 1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm& ;r=1&f=G&l=50&s1=7,220,815.PN.&OS=PN/7,220,815&RS=PN/7,220,815.
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