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Branched polyesters prepared from macrocyclic poly(Alkylene Dicarboxylate) oligomers
U.S. Patent Number: 5387666
Abstract: Cyclic tin catalysts are employed for the preparation of branched polyesters from macrocyclic polyester oligomers. They are less susceptible than previously known catalysts to the presence of acidic impurities in the oligomer compositions.
Inventors: Takekoshi; Tohru (Scotia, NY), Pearce; Eric J. (Ballston Lake, NY)
Assignee: General Electric Company (Schenectady, NY)
Application Number: 08/262,799
Issued: 1995-02-07
Expired: 2007-02-07
Classes: 528/283 ; 524/784; 528/299
Field of search: 528/283,299 524/784
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